static int
ts_http_fetcher_verify_cl(http_fetcher *fch, int code)
{
int64_t need, left;
if (fch->resp_already >= fch->resp_cl)
return BODY_COMPLETE;
left = TSIOBufferReaderAvail(fch->flow_reader);
if (fch->resp_already + left >= fch->resp_cl) {
need = fch->resp_cl - fch->resp_already;
} else {
need = left;
}
TSIOBufferCopy(fch->body_buffer, fch->flow_reader, need, 0);
TSIOBufferReaderConsume(fch->flow_reader, need);
fch->resp_already += left;
if (fch->resp_already >= fch->resp_cl)
return BODY_COMPLETE;
else if (code == BODY_COMPLETE)
return BODY_ERROR;
return BODY_READY;
}
static int
transform_bypass(TSCont contp, TransformData *data)
{
data->state = STATE_BYPASS;
if (data->server_vc) {
TSVConnAbort(data->server_vc, 1);
data->server_vc = NULL;
data->server_vio = NULL;
}
if (data->output_buf) {
TSIOBufferDestroy(data->output_buf);
data->output_buf = NULL;
data->output_reader = NULL;
}
TSIOBufferReaderConsume(data->input_reader, sizeof(int));
data->output_vc = TSTransformOutputVConnGet((TSVConn)contp);
if (data->output_vc == NULL) {
TSError("[%s] TSTransformOutputVConnGet returns NULL", PLUGIN_NAME);
} else {
data->output_vio = TSVConnWrite(data->output_vc, contp, data->input_reader, TSIOBufferReaderAvail(data->input_reader));
if (data->output_vio == NULL) {
TSError("[%s] TSVConnWrite returns NULL", PLUGIN_NAME);
}
}
return 1;
}
// This serves to consume all the data that arrives. If it's not consumed the tunnel gets stalled
// and the transaction doesn't complete. Other things could be done with the data, accessible via
// the IO buffer @a reader, such as writing it to disk to make an externally accessible copy.
static int
client_reader(TSCont contp, TSEvent event, void *edata)
{
SinkData *data = TSContDataGet(contp);
// If we got closed, we're done.
if (TSVConnClosedGet(contp)) {
TSfree(data);
TSContDestroy(contp);
return 0;
}
TSVIO input_vio = TSVConnWriteVIOGet(contp);
if (!data) {
data = TSmalloc(sizeof(SinkData));
data->total = 0;
TSContDataSet(contp, data);
}
switch (event) {
case TS_EVENT_ERROR:
TSDebug(PLUGIN_NAME, "Error event");
TSContCall(TSVIOContGet(input_vio), TS_EVENT_ERROR, input_vio);
break;
case TS_EVENT_VCONN_READ_COMPLETE:
TSDebug(PLUGIN_NAME, "READ_COMPLETE");
break;
case TS_EVENT_VCONN_READ_READY:
case TS_EVENT_IMMEDIATE:
TSDebug(PLUGIN_NAME, "Data event - %s", event == TS_EVENT_IMMEDIATE ? "IMMEDIATE" : "READ_READY");
// Look for data and if we find any, consume.
if (TSVIOBufferGet(input_vio)) {
TSIOBufferReader reader = TSVIOReaderGet(input_vio);
int64_t n = TSIOBufferReaderAvail(reader);
if (n > 0) {
TSIOBufferReaderConsume(reader, n);
TSVIONDoneSet(input_vio, TSVIONDoneGet(input_vio) + n);
data->total += n; // internal accounting so we can print the value at the end.
TSDebug(PLUGIN_NAME, "Consumed %" PRId64 " bytes", n);
}
if (TSVIONTodoGet(input_vio) > 0) {
// signal that we can accept more data.
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_READY, input_vio);
} else {
TSDebug(PLUGIN_NAME, "send WRITE_COMPLETE");
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
}
} else { // buffer gone, we're done.
TSDebug(PLUGIN_NAME, "upstream buffer disappeared - %" PRId64 " bytes", data->total);
}
break;
default:
TSDebug(PLUGIN_NAME, "unhandled event %d", event);
break;
}
return 0;
}
int
ts_http_fetcher_parse_header(http_fetcher *fch)
{
int64_t avail, used;
const char *start, *guard, *end;
int ret;
TSIOBufferBlock blk;
blk = TSIOBufferReaderStart(fch->resp_reader);
while (blk) {
guard = start = TSIOBufferBlockReadStart(blk, fch->resp_reader, &avail);
end = start + avail;
ret = TSHttpHdrParseResp(fch->http_parser, fch->hdr_bufp, fch->hdr_loc, &start, end);
switch (ret) {
case TS_PARSE_ERROR:
return -1;
case TS_PARSE_DONE:
used = start - guard;
TSIOBufferCopy(fch->hdr_buffer, fch->resp_reader, used, 0);
TSIOBufferReaderConsume(fch->resp_reader, used);
ts_http_fetcher_extract(fch);
// ts_http_fetcher_setup_filter(fch);
fch->header_done = 1;
return 0;
default:
TSIOBufferCopy(fch->hdr_buffer, fch->resp_reader, avail, 0);
TSIOBufferReaderConsume(fch->resp_reader, avail);
break;
}
blk = TSIOBufferBlockNext(blk);
}
return 0;
}
static int
ts_http_fetcher_transfer(http_fetcher *fch, int code)
{
int64_t left;
left = TSIOBufferReaderAvail(fch->flow_reader);
TSIOBufferCopy(fch->body_buffer, fch->flow_reader, left, 0);
TSIOBufferReaderConsume(fch->flow_reader, left);
return code;
}
void
ts_http_fetcher_consume_resp_body(http_fetcher *fch, int64_t len)
{
if (!fch->header_done)
return;
TSIOBufferReaderConsume(fch->body_reader, len);
if (!fch->deleted && !fch->action &&
TSIOBufferReaderAvail(fch->body_reader) < TS_FETCH_MARK_BODY_LOW_WATER) {
fch->action = TSContSchedule(fch->fetch_contp, 0, TS_THREAD_POOL_DEFAULT);
}
}
static int
ts_lua_cache_handle_write(ts_lua_cont_info *ci, ts_lua_cache_info *info, TSEvent event, void *edata)
{
lua_State *L;
TSMutex mtx;
int64_t avail, done, n;
n = 0;
switch (event) {
case TS_EVENT_VCONN_WRITE_READY:
done = TSVIONDoneGet(info->ioh.vio);
if (done < info->need) {
TSVIOReenable(info->ioh.vio);
} else {
n = info->need - info->already;
avail = TSIOBufferReaderAvail(info->ioh.reader);
TSIOBufferReaderConsume(info->ioh.reader, avail);
}
break;
default:
info->err = 1;
break;
}
if (info->wait && (n > 0 || info->err)) { // resume
L = ci->routine.lua;
mtx = ci->routine.mctx->mutexp;
TSMutexLock(mtx);
if (n > 0) {
lua_pushnumber(L, n);
info->already = info->need;
} else {
lua_pushnumber(L, 0);
}
info->wait = 0;
TSContCall(ci->contp, TS_LUA_EVENT_COROUTINE_CONT, (void*)1);
TSMutexUnlock(mtx);
}
return 0;
}
/**
* Function to buffer data, and flush buffer according to buffering rules.
*
* @param[in] fctx - the filter data
* @param[in] reader - the data reader
* @param[in] nbytes - number of bytes to buffer
* @return success or error status
*/
static ib_status_t buffer_data_chunk(ib_filter_ctx *fctx, TSIOBufferReader reader, int64_t nbytes)
{
ib_status_t rc = IB_OK;
int64_t copied;
if (fctx->buffering == IOBUF_DISCARD) {
/* discard anything we have buffered */
if (fctx->buffered > 0) {
TSIOBufferReaderConsume(fctx->reader, fctx->buffered);
fctx->buffered = 0;
}
/* caller will mark input consumed, so do-nothing == discard */
return rc;
}
if ((fctx->buffering == IOBUF_BUFFER_FLUSHALL)
&& (fctx->buffered + nbytes > fctx->buf_limit)) {
/* flush all old data before buffering new data */
rc = flush_data(fctx, -1, 0);
}
/* If buffering enabled, copy the chunk to our buffer */
/* It's only a refcount here */
copied = TSIOBufferCopy(fctx->buffer, reader, nbytes, 0);
fctx->buffered += copied;
if (fctx->buffering == IOBUF_NOBUF) {
/* consume it all right now */
rc = flush_data(fctx, -1, 0);
}
else if ((fctx->buffering == IOBUF_BUFFER_FLUSHPART)
&& (fctx->buffered > fctx->buf_limit)) {
/* flush just enough data to bring us within the limit */
rc = flush_data(fctx, fctx->buffered - fctx->buf_limit, 0);
}
/* Check buffer size vs policy in operation */
/* If we're over the limit, flush by passing to edit */
return rc;
}
static int
ts_lua_http_intercept_process_read(TSEvent event, ts_lua_http_intercept_ctx *ictx)
{
int64_t avail = TSIOBufferReaderAvail(ictx->input.reader);
TSIOBufferReaderConsume(ictx->input.reader, avail);
switch (event) {
case TS_EVENT_VCONN_READ_READY:
TSVConnShutdown(ictx->net_vc, 1, 0);
case TS_EVENT_VCONN_READ_COMPLETE:
case TS_EVENT_VCONN_EOS:
ictx->recv_complete = 1;
break;
default:
return -1;
}
return 0;
}
static int
transform_read_status_event(TSCont contp, TransformData * data, TSEvent event, void *edata)
{
switch (event) {
case TS_EVENT_ERROR:
case TS_EVENT_VCONN_EOS:
return transform_bypass(contp, data);
case TS_EVENT_VCONN_READ_COMPLETE:
if (TSIOBufferReaderAvail(data->output_reader) == sizeof(int)) {
TSIOBufferBlock blk;
char *buf;
void *buf_ptr;
int64_t avail;
int64_t read_nbytes = sizeof(int);
int64_t read_ndone = 0;
buf_ptr = &data->content_length;
while (read_nbytes > 0) {
blk = TSIOBufferReaderStart(data->output_reader);
buf = (char *) TSIOBufferBlockReadStart(blk, data->output_reader, &avail);
read_ndone = (avail >= read_nbytes) ? read_nbytes : avail;
memcpy(buf_ptr, buf, read_ndone);
if (read_ndone > 0) {
TSIOBufferReaderConsume(data->output_reader, read_ndone);
read_nbytes -= read_ndone;
/* move ptr frwd by read_ndone bytes */
buf_ptr = (char *) buf_ptr + read_ndone;
}
}
//data->content_length = ntohl(data->content_length);
return transform_read(contp, data);
}
return transform_bypass(contp, data);
default:
break;
}
return 0;
}
/*-------------------------------------------------------------------------
dump_psi
Dump the psi_output to the downstream vconnection.
Input:
contp continuation for the current transaction
Output :
Return Value:
0 if failure
1 if success
-------------------------------------------------------------------------*/
static int
dump_psi(TSCont contp)
{
ContData *data;
int psi_output_len;
/* TODO: This is odd, do we need to get the input_vio, but never use it ?? */
#if 0
TSVIO input_vio;
input_vio = TSVConnWriteVIOGet(contp);
#endif
data = TSContDataGet(contp);
TSAssert(data->magic == MAGIC_ALIVE);
/* If script exec succeded, copy its output to the downstream vconn */
if (data->psi_success == 1) {
psi_output_len = TSIOBufferReaderAvail(data->psi_reader);
if (psi_output_len > 0) {
data->transform_bytes += psi_output_len;
TSDebug(DBG_TAG, "Inserting %d bytes from include file", psi_output_len);
/* TODO: Should we check the return value of TSIOBufferCopy() ? */
TSIOBufferCopy(TSVIOBufferGet(data->output_vio), data->psi_reader, psi_output_len, 0);
/* Consume all the output data */
TSIOBufferReaderConsume(data->psi_reader, psi_output_len);
/* Reenable the output connection so it can read the data we've produced. */
TSVIOReenable(data->output_vio);
}
}
/* Change state to finish up reading upstream data */
data->state = STATE_READ_DATA;
return 0;
}
int
ts_chunked_process(TSIOBufferReader readerp, TSIOBuffer bufp, int end)
{
char hex[32];
int n;
int64_t avail;
avail = TSIOBufferReaderAvail(readerp);
if (avail) {
n = snprintf(hex, sizeof(hex), "%llx\r\n", (long long)avail);
TSIOBufferWrite(bufp, hex, n);
TSIOBufferCopy(bufp, readerp, avail, 0);
TSIOBufferWrite(bufp, "\r\n", sizeof("\r\n") - 1);
TSIOBufferReaderConsume(readerp, avail);
}
if (end)
TSIOBufferWrite(bufp, "0\r\n\r\n", sizeof("0\r\n\r\n") - 1);
return end;
}
static void process_data(TSCont contp, ibd_ctx* ibd)
{
TSVConn output_conn;
TSIOBuffer buf_test;
TSVIO input_vio;
ib_txn_ctx *data;
int64_t towrite;
int64_t avail;
int first_time = 0;
char *bufp = NULL;
TSDebug("ironbee", "Entering process_data()");
/* Get the output (downstream) vconnection where we'll write data to. */
output_conn = TSTransformOutputVConnGet(contp);
/* Get the write VIO for the write operation that was performed on
* ourself. This VIO contains the buffer that we are to read from
* as well as the continuation we are to call when the buffer is
* empty. This is the input VIO (the write VIO for the upstream
* vconnection).
*/
input_vio = TSVConnWriteVIOGet(contp);
data = TSContDataGet(contp);
if (!ibd->data->output_buffer) {
first_time = 1;
ibd->data->output_buffer = TSIOBufferCreate();
ibd->data->output_reader = TSIOBufferReaderAlloc(ibd->data->output_buffer);
TSDebug("ironbee", "\tWriting %d bytes on VConn", TSVIONBytesGet(input_vio));
ibd->data->output_vio = TSVConnWrite(output_conn, contp, ibd->data->output_reader, INT64_MAX);
}
if (ibd->data->buf) {
/* this is the second call to us, and we have data buffered.
* Feed buffered data to ironbee
*/
ib_conndata_t icdata;
icdata.ib = ironbee;
icdata.mp = data->ssn->iconn->mp;
icdata.conn = data->ssn->iconn;
icdata.dalloc = ibd->data->buflen;
icdata.dlen = ibd->data->buflen;
icdata.data = (uint8_t *)ibd->data->buf;
(*ibd->ibd->ib_notify)(ironbee, &icdata);
TSfree(ibd->data->buf);
ibd->data->buf = NULL;
ibd->data->buflen = 0;
}
/* test for input data */
buf_test = TSVIOBufferGet(input_vio);
if (!buf_test) {
TSDebug("ironbee", "No more data, finishing");
TSVIONBytesSet(ibd->data->output_vio, TSVIONDoneGet(input_vio));
TSVIOReenable(ibd->data->output_vio);
/* FIXME - is this right here - can conn data be kept across reqs? */
ibd->data->output_buffer = NULL;
ibd->data->output_reader = NULL;
ibd->data->output_vio = NULL;
return;
}
/* Determine how much data we have left to read. For this null
* transform plugin this is also the amount of data we have left
* to write to the output connection.
*/
towrite = TSVIONTodoGet(input_vio);
TSDebug("ironbee", "\ttoWrite is %" PRId64 "", towrite);
if (towrite > 0) {
/* The amount of data left to read needs to be truncated by
* the amount of data actually in the read buffer.
*/
/* first time through, we have to buffer the data until
* after the headers have been sent. Ugh!
*/
if (first_time) {
bufp = ibd->data->buf = TSmalloc(towrite);
ibd->data->buflen = towrite;
}
avail = TSIOBufferReaderAvail(TSVIOReaderGet(input_vio));
TSDebug("ironbee", "\tavail is %" PRId64 "", avail);
if (towrite > avail) {
towrite = avail;
}
if (towrite > 0) {
int btowrite = towrite;
/* Copy the data from the read buffer to the output buffer. */
TSIOBufferCopy(TSVIOBufferGet(ibd->data->output_vio), TSVIOReaderGet(input_vio), towrite, 0);
/* feed the data to ironbee, and consume them */
while (btowrite > 0) {
ib_conndata_t icdata;
int64_t ilength;
TSIOBufferReader input_reader = TSVIOReaderGet(input_vio);
TSIOBufferBlock blkp = TSIOBufferReaderStart(input_reader);
const char *ibuf = TSIOBufferBlockReadStart(blkp, input_reader, &ilength);
/* feed it to ironbee or to buffer */
if (first_time) {
memcpy(bufp, ibuf, ilength);
bufp += ilength;
}
else {
icdata.ib = ironbee;
icdata.mp = data->ssn->iconn->mp;
icdata.conn = data->ssn->iconn;
icdata.dalloc = ilength;
icdata.dlen = ilength;
icdata.data = (uint8_t *)ibuf;
(*ibd->ibd->ib_notify)(ironbee, &icdata);
}
//"response", TSHttpTxnClientRespGet, ib_state_notify_conn_data_out
// ib_state_notify_conn_data_out(ironbee, &icdata);
/* and mark it as all consumed */
btowrite -= ilength;
TSIOBufferReaderConsume(input_reader, ilength);
TSVIONDoneSet(input_vio, TSVIONDoneGet(input_vio) + ilength);
}
}
}
/* Now we check the input VIO to see if there is data left to
* read.
*/
if (TSVIONTodoGet(input_vio) > 0) {
if (towrite > 0) {
/* If there is data left to read, then we reenable the output
* connection by reenabling the output VIO. This will wake up
* the output connection and allow it to consume data from the
* output buffer.
*/
TSVIOReenable(ibd->data->output_vio);
/* Call back the input VIO continuation to let it know that we
* are ready for more data.
*/
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_READY, input_vio);
}
} else {
/* If there is no data left to read, then we modify the output
* VIO to reflect how much data the output connection should
* expect. This allows the output connection to know when it
* is done reading. We then reenable the output connection so
* that it can consume the data we just gave it.
*/
TSVIONBytesSet(ibd->data->output_vio, TSVIONDoneGet(input_vio));
TSVIOReenable(ibd->data->output_vio);
/* Call back the input VIO continuation to let it know that we
* have completed the write operation.
*/
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
}
}
int
ts_http_fetcher_filter_body(http_fetcher *fch, int ev)
{
int ret;
int64_t resp_avail, body_avail, wavail, need;
if (fch->action) {
TSActionCancel(fch->action);
fch->action = NULL;
}
need = 0;
resp_avail = TSIOBufferReaderAvail(fch->resp_reader);
if (ev != BODY_COMPLETE) {
body_avail = TSIOBufferReaderAvail(fch->body_reader);
wavail = TS_FETCH_MARK_BODY_HIGH_WATER - body_avail;
if (wavail <= 0)
return TS_FETCH_EVENT_BODY_QUIET;
need = resp_avail > wavail ? wavail : resp_avail;
TSIOBufferCopy(fch->flow_buffer, fch->resp_reader, need, 0);
TSIOBufferReaderConsume(fch->resp_reader, need);
if (TSIOBufferReaderAvail(fch->resp_reader) < TS_FETCH_MARK_RESP_LOW_WATER)
TSVIOReenable(fch->read_vio);
} else {
TSIOBufferCopy(fch->flow_buffer, fch->resp_reader, resp_avail, 0);
TSIOBufferReaderConsume(fch->resp_reader, resp_avail);
need = resp_avail;
}
if (fch->chunked) {
ret = ts_http_fetcher_verify_chunked(fch, ev);
} else if (fch->resp_cl >= 0) {
ret = ts_http_fetcher_verify_cl(fch, ev);
} else {
ret = ts_http_fetcher_transfer(fch, ev);
}
switch (ret) {
case BODY_READY:
if (need == 0)
return TS_FETCH_EVENT_BODY_QUIET;
return TS_FETCH_EVENT_BODY_READY;
case BODY_COMPLETE:
fch->body_done = 1;
return TS_FETCH_EVENT_BODY_COMPLETE;
default:
break;
}
fch->error = 1;
return TS_FETCH_EVENT_ERROR;
}
static int
handle_buffering(TSCont contp, JCrusherData * data)
{
TSVIO upstream_vio;
TSIOBuffer upstream_buffer;
int64_t toread;
int64_t avail;
TSDebug("jcrusher", "Start of handle_buffering()");
/* Get the write VIO for the write operation that was performed on
ourself. This VIO contains the buffer that we are to read from
as well as the continuation we are to call when the buffer is
empty. */
upstream_vio = TSVConnWriteVIOGet(contp);
/* Create the output buffer and its associated reader */
if (!data->downstream_buffer) {
data->downstream_buffer = TSIOBufferCreate();
TSAssert(data->downstream_buffer);
data->downstream_reader = TSIOBufferReaderAlloc(data->downstream_buffer);
TSAssert(data->downstream_reader);
}
/* We also check to see if the write VIO's buffer is non-NULL. A
NULL buffer indicates that the write operation has been
shutdown and that the continuation does not want us to send any
more WRITE_READY or WRITE_COMPLETE events. For this buffered
transformation that means we're done buffering data. */
upstream_buffer = TSVIOBufferGet(upstream_vio);
if (NULL == upstream_buffer) {
data->state = STATE_OUTPUT_DATA;
TSDebug("jcrusher", "handle_buffering - upstream_buffer is NULL");
return 0;
}
/* Determine how much data we have left to read. For this bnull
transform plugin this is also the amount of data we have left
to write to the output connection. */
toread = TSVIONTodoGet(upstream_vio);
TSDebug("jcrusher", "handle_buffering - toread is %" PRId64, toread);
if (toread > 0) {
/* The amount of data left to read needs to be truncated by
the amount of data actually in the read buffer. */
avail = TSIOBufferReaderAvail(TSVIOReaderGet(upstream_vio));
if (toread > avail) {
toread = avail;
}
TSDebug("jcrusher", "handle_buffering - toread is %" PRId64, toread);
TSDebug("jcrusher", "handle_buffering - avail is %" PRId64, avail);
TSIOBufferReader upstream_reader = TSVIOReaderGet(upstream_vio);
TSIOBufferBlock upstream_blk = TSIOBufferReaderStart(upstream_reader);
const char *input = TSIOBufferBlockReadStart(upstream_blk, upstream_reader, &toread);
TSDebug("jcrusher", "handle_buffering - just read [%d] bytes from buffer", (int)strlen(input));
TSDebug("jcrusher", "handle_buffering - parse json input");
data->json_obj = json_tokener_parse_ex(data->json_tok, input, strlen(input));
if (json_tokener_success == (data->json_err = json_tokener_get_error(data->json_tok))) {
TSDebug("jcrusher", "handle_buffering - got json_tokener_success");
data->state = STATE_OUTPUT_DATA;
/* Call back the write VIO continuation to let it know that we
have completed the write operation. */
TSContCall(TSVIOContGet(upstream_vio), TS_EVENT_VCONN_WRITE_COMPLETE, upstream_vio);
return 1;
}
TSDebug("jcrusher", "handle_buffering - got json_tokener_continue");
/* Tell the read buffer that we have read the data and are no
longer interested in it. */
TSIOBufferReaderConsume(TSVIOReaderGet(upstream_vio), toread);
/* Modify the upstream VIO to reflect how much data we've
completed. */
TSVIONDoneSet(upstream_vio, TSVIONDoneGet(upstream_vio) + toread);
/* Now we check the upstream VIO to see if there is data left to read. */
/* Call back the upstream VIO continuation to let it know that we
are ready for more data. */
TSContCall(TSVIOContGet(upstream_vio), TS_EVENT_VCONN_WRITE_READY, upstream_vio);
} else {
TSDebug("jcrusher", "handle_buffering - seems we read all");
data->state = STATE_OUTPUT_DATA;
/* Call back the write VIO continuation to let it know that we
have completed the write operation. */
TSContCall(TSVIOContGet(upstream_vio), TS_EVENT_VCONN_WRITE_COMPLETE, upstream_vio);
}
TSDebug("jcrusher", "handle_buffering - End");
return 1;
}
static void
handle_transform(TSCont contp)
{
TSVConn output_conn;
TSIOBuffer buf_test;
TSVIO input_vio;
MyData *data;
int64_t towrite;
int64_t avail;
TSDebug("null-transform", "Entering handle_transform()");
/* Get the output (downstream) vconnection where we'll write data to. */
output_conn = TSTransformOutputVConnGet(contp);
/* Get the write VIO for the write operation that was performed on
* ourself. This VIO contains the buffer that we are to read from
* as well as the continuation we are to call when the buffer is
* empty. This is the input VIO (the write VIO for the upstream
* vconnection).
*/
input_vio = TSVConnWriteVIOGet(contp);
/* Get our data structure for this operation. The private data
* structure contains the output VIO and output buffer. If the
* private data structure pointer is NULL, then we'll create it
* and initialize its internals.
*/
data = TSContDataGet(contp);
if (!data) {
data = my_data_alloc();
data->output_buffer = TSIOBufferCreate();
data->output_reader = TSIOBufferReaderAlloc(data->output_buffer);
TSDebug("null-transform", "\tWriting %" PRId64 " bytes on VConn", TSVIONBytesGet(input_vio));
// data->output_vio = TSVConnWrite(output_conn, contp, data->output_reader, INT32_MAX);
data->output_vio = TSVConnWrite(output_conn, contp, data->output_reader, INT64_MAX);
// data->output_vio = TSVConnWrite(output_conn, contp, data->output_reader, TSVIONBytesGet(input_vio));
TSContDataSet(contp, data);
}
/* We also check to see if the input VIO's buffer is non-NULL. A
* NULL buffer indicates that the write operation has been
* shutdown and that the upstream continuation does not want us to send any
* more WRITE_READY or WRITE_COMPLETE events. For this simplistic
* transformation that means we're done. In a more complex
* transformation we might have to finish writing the transformed
* data to our output connection.
*/
buf_test = TSVIOBufferGet(input_vio);
if (!buf_test) {
TSVIONBytesSet(data->output_vio, TSVIONDoneGet(input_vio));
TSVIOReenable(data->output_vio);
return;
}
/* Determine how much data we have left to read. For this null
* transform plugin this is also the amount of data we have left
* to write to the output connection.
*/
towrite = TSVIONTodoGet(input_vio);
TSDebug("null-transform", "\ttoWrite is %" PRId64 "", towrite);
if (towrite > 0) {
/* The amount of data left to read needs to be truncated by
* the amount of data actually in the read buffer.
*/
avail = TSIOBufferReaderAvail(TSVIOReaderGet(input_vio));
TSDebug("null-transform", "\tavail is %" PRId64 "", avail);
if (towrite > avail) {
towrite = avail;
}
if (towrite > 0) {
/* Copy the data from the read buffer to the output buffer. */
TSIOBufferCopy(TSVIOBufferGet(data->output_vio), TSVIOReaderGet(input_vio), towrite, 0);
/* Tell the read buffer that we have read the data and are no
* longer interested in it.
*/
TSIOBufferReaderConsume(TSVIOReaderGet(input_vio), towrite);
/* Modify the input VIO to reflect how much data we've
* completed.
*/
TSVIONDoneSet(input_vio, TSVIONDoneGet(input_vio) + towrite);
}
}
/* Now we check the input VIO to see if there is data left to
* read.
*/
if (TSVIONTodoGet(input_vio) > 0) {
if (towrite > 0) {
/* If there is data left to read, then we reenable the output
* connection by reenabling the output VIO. This will wake up
* the output connection and allow it to consume data from the
* output buffer.
*/
TSVIOReenable(data->output_vio);
/* Call back the input VIO continuation to let it know that we
* are ready for more data.
*/
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_READY, input_vio);
}
} else {
/* If there is no data left to read, then we modify the output
* VIO to reflect how much data the output connection should
* expect. This allows the output connection to know when it
* is done reading. We then reenable the output connection so
* that it can consume the data we just gave it.
*/
TSVIONBytesSet(data->output_vio, TSVIONDoneGet(input_vio));
TSVIOReenable(data->output_vio);
/* Call back the input VIO continuation to let it know that we
* have completed the write operation.
*/
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
}
}
int
ts_dechunk_process(ts_dechunk_info *info, TSIOBufferReader readerp, TSIOBuffer bufp, int end)
{
int n;
int64_t avail, need;
int64_t blk_len;
const char *start;
const char *cur;
TSIOBufferBlock blk, next_blk;
blk = TSIOBufferReaderStart(readerp);
while (blk) {
next_blk = TSIOBufferBlockNext(blk);
start = TSIOBufferBlockReadStart(blk, readerp, &blk_len);
avail = blk_len;
if (avail) {
do {
cur = start + blk_len - avail;
switch (info->state) {
case TS_DECHUNK_WAIT_LENGTH:
n = ts_dechunk_extract_frag_len(info, cur, avail);
if (n < 0)
return -1;
avail -= n;
if (!info->dechunk_enabled)
TSIOBufferCopy(bufp, readerp, n, 0);
TSIOBufferReaderConsume(readerp, n);
break;
case TS_DECHUNK_WAIT_RETURN:
n = ts_dechunk_extract_return(info, cur, avail, 0);
avail -= n;
if (!info->dechunk_enabled)
TSIOBufferCopy(bufp, readerp, n, 0);
TSIOBufferReaderConsume(readerp, n);
break;
case TS_DECHUNK_WAIT_DATA:
if (info->frag_len + avail <= info->frag_total) {
TSIOBufferCopy(bufp, readerp, avail, 0);
TSIOBufferReaderConsume(readerp, avail);
info->frag_len += avail;
avail = 0;
break;
} else {
need = info->frag_total - info->frag_len;
if (need) {
TSIOBufferCopy(bufp, readerp, need, 0);
TSIOBufferReaderConsume(readerp, need);
info->frag_len += need;
avail -= need;
}
info->cr = 0;
info->state = TS_DECHUNK_WAIT_RETURN_END;
}
break;
case TS_DECHUNK_WAIT_RETURN_END:
n = ts_dechunk_extract_return(info, cur, avail, 1);
avail -= n;
if (!info->dechunk_enabled)
TSIOBufferCopy(bufp, readerp, n, 0);
TSIOBufferReaderConsume(readerp, n);
break;
case TS_DECHUNK_DATA_DONE:
if (!info->dechunk_enabled)
TSIOBufferCopy(bufp, readerp, avail, 0);
TSIOBufferReaderConsume(readerp, avail);
avail = 0;
info->done = 1;
break;
default:
break;
}
} while (avail > 0);
}
if (info->done)
break;
blk = next_blk;
}
if (info->done) {
return 1;
} else if (end) {
return -1;
} else {
return 0;
}
}
static void
handle_dns(TSHttpTxn txnp, TSCont contp ATS_UNUSED)
{
TSMBuffer bufp;
TSMLoc hdr_loc;
TSIOBuffer output_buffer;
TSIOBufferReader reader;
int total_avail;
TSIOBufferBlock block;
const char *block_start;
int64_t block_avail;
char *output_string;
int64_t output_len;
if (TSHttpTxnClientReqGet(txnp, &bufp, &hdr_loc) != TS_SUCCESS) {
TSDebug(PLUGIN_NAME, "couldn't retrieve client request header");
TSError("[%s] Couldn't retrieve client request header", PLUGIN_NAME);
goto done;
}
output_buffer = TSIOBufferCreate();
reader = TSIOBufferReaderAlloc(output_buffer);
/* This will print just MIMEFields and not
the http request line */
TSDebug(PLUGIN_NAME, "Printing the hdrs ... ");
TSMimeHdrPrint(bufp, hdr_loc, output_buffer);
if (TSHandleMLocRelease(bufp, TS_NULL_MLOC, hdr_loc) == TS_ERROR) {
TSDebug(PLUGIN_NAME, "non-fatal: error releasing MLoc");
TSError("[%s] non-fatal: Couldn't release MLoc", PLUGIN_NAME);
}
/* Find out how the big the complete header is by
seeing the total bytes in the buffer. We need to
look at the buffer rather than the first block to
see the size of the entire header */
total_avail = TSIOBufferReaderAvail(reader);
/* Allocate the string with an extra byte for the string
terminator */
output_string = (char *)TSmalloc(total_avail + 1);
output_len = 0;
/* We need to loop over all the buffer blocks to make
sure we get the complete header since the header can
be in multiple blocks */
block = TSIOBufferReaderStart(reader);
while (block) {
block_start = TSIOBufferBlockReadStart(block, reader, &block_avail);
/* We'll get a block pointer back even if there is no data
left to read so check for this condition and break out of
the loop. A block with no data to read means we've exhausted
buffer of data since if there was more data on a later
block in the chain, this block would have been skipped over */
if (block_avail == 0) {
break;
}
memcpy(output_string + output_len, block_start, block_avail);
output_len += block_avail;
/* Consume the data so that we get to the next block */
TSIOBufferReaderConsume(reader, block_avail);
/* Get the next block now that we've consumed the
data off the last block */
block = TSIOBufferReaderStart(reader);
}
/* Terminate the string */
output_string[output_len] = '\0';
output_len++;
/* Free up the TSIOBuffer that we used to print out the header */
TSIOBufferReaderFree(reader);
TSIOBufferDestroy(output_buffer);
/* Although I'd never do this a production plugin, printf
the header so that we can see it's all there */
TSDebug(PLUGIN_NAME, "%s", output_string);
TSfree(output_string);
done:
TSHttpTxnReenable(txnp, TS_EVENT_HTTP_CONTINUE);
}
/**
* Process data from ATS.
*
* Process data from one of the ATS events.
*
* @param[in,out] contp - the continuation
* @param[in,out] ibd - the filter descriptor
*/
static void process_data(TSCont contp, ibd_ctx *ibd)
{
int64_t ntodo;
int64_t navail;
TSIOBufferReader input_reader, output_reader;
TSIOBufferBlock block;
const char *buf;
int64_t nbytes;
ib_status_t rc;
ib_filter_ctx *fctx = ibd->data;
ib_txn_ctx *data = TSContDataGet(contp);
TSVIO input_vio = TSVConnWriteVIOGet(contp);
TSIOBuffer in_buf = TSVIOBufferGet(input_vio);
/* Test whether we're going into an errordoc */
if (IB_HTTP_CODE(data->status)) { /* We're going to an error document,
* so we discard all this data
*/
TSDebug("ironbee", "Status is %d, discarding", data->status);
ibd->data->buffering = IOBUF_DISCARD;
}
/* Test for EOS */
if (in_buf == NULL) {
/* flush anything we have buffered. This is final! */
flush_data(fctx, -1, 1);
return;
}
ntodo = TSVIONTodoGet(input_vio);
/* Test for first time, and initialise. */
if (!fctx->output_buffer) {
fctx->output_buffer = TSIOBufferCreate();
ib_mm_register_cleanup(data->tx->mm,
(ib_mm_cleanup_fn_t) TSIOBufferDestroy,
(void*) fctx->output_buffer);
output_reader = TSIOBufferReaderAlloc(fctx->output_buffer);
fctx->output_vio = TSVConnWrite(TSTransformOutputVConnGet(contp), contp, output_reader, TSVIONBytesGet(input_vio));
fctx->buffer = TSIOBufferCreate();
ib_mm_register_cleanup(data->tx->mm,
(ib_mm_cleanup_fn_t) TSIOBufferDestroy,
(void*) fctx->buffer);
fctx->reader = TSIOBufferReaderAlloc(fctx->buffer);
/* Get the buffering config */
if (!IB_HTTP_CODE(data->status)) {
buffer_init(ibd, data->tx);
}
/* Do we still have to delay feeding the first data to Ironbee
* to keep the IB events in their proper order?
*
* Appears maybe not, so let's do nothing until it shows signs of breakage.
*/
#if BUFFER_FIRST
/* First time through we can only buffer data until headers are sent. */
fctx->first_time = 1;
input_reader = TSVIOReaderGet(input_vio);
fctx->buffered = TSIOBufferCopy(fctx->buffer, TSVIOReaderGet(input_vio),
ntodo, 0);
TSIOBufferReaderConsume(input_reader, fctx->buffered);
/* Do we need to request more input or just continue? */
TSVIONDoneSet(input_vio, fctx->buffu`ered + fctx->bytes_done);
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_READY, input_vio);
return;
#endif
}
/* second time through we have to feed already-buffered data through
* ironbee while retaining it in buffer. Regardless of what else happens.
*/
#if BUFFER_FIRST
if (fctx->first_time) {
fctx->first_time = 0;
for (block = TSIOBufferStart(fctx->buffer);
block != NULL;
block = TSIOBufferBlockNext(block)) {
//nbytes = TSIOBufferBlockDataSizeGet(block);
/* FIXME - do this without a reader ? */
buf = TSIOBufferBlockReadStart(block, fctx->reader, &nbytes);
//rc = examine_data_chunk(ibd->ibd, data->tx, buf, nbytes);
rc = (*ibd->ibd->ib_notify_body)(data->tx->ib, data->tx, buf, nbytes);
if (rc != IB_OK) {
// FIXME ???
}
}
}
#endif
/* Test for EOS */
if (ntodo == 0) {
TSDebug("[ironbee]", "ntodo zero before consuming data");
/* Call back the input VIO continuation to let it know that we
* have completed the write operation.
*/
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
return;
}
/* OK, there's some input awaiting our attention */
input_reader = TSVIOReaderGet(input_vio);
while (navail = TSIOBufferReaderAvail(input_reader), navail > 0) {
block = TSIOBufferReaderStart(input_reader);
buf = TSIOBufferBlockReadStart(block, input_reader, &nbytes);
rc = (*ibd->ibd->ib_notify_body)(data->tx->ib, data->tx, buf, nbytes);
if (rc != IB_OK) {
// FIXME ???
}
rc = buffer_data_chunk(fctx, input_reader, nbytes);
if (rc != IB_OK) {
// FIXME ???
}
TSIOBufferReaderConsume(input_reader, nbytes);
TSVIONDoneSet(input_vio, TSVIONDoneGet(input_vio) + nbytes);
}
ntodo = TSVIONTodoGet(input_vio);
if (ntodo == 0) {
TSDebug("[ironbee]", "ntodo zero after consuming data");
/* Call back the input VIO continuation to let it know that we
* have completed the write operation.
*/
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
}
else {
/* Call back the input VIO continuation to let it know that we
* are ready for more data.
*/
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_READY, input_vio);
}
}
static int
ts_lua_transform_handler(TSCont contp, ts_lua_transform_ctx *transform_ctx)
{
TSVConn output_conn;
TSVIO input_vio;
TSIOBufferReader input_reader;
TSIOBufferBlock blk;
int64_t towrite, blk_len, upstream_done, avail, left;
const char *start;
const char *res;
size_t res_len;
int ret, eos;
lua_State *L;
TSMutex mtxp;
L = transform_ctx->hctx->lua;
mtxp = transform_ctx->hctx->mctx->mutexp;
output_conn = TSTransformOutputVConnGet(contp);
input_vio = TSVConnWriteVIOGet(contp);
input_reader = TSVIOReaderGet(input_vio);
if (!transform_ctx->output_buffer) {
transform_ctx->output_buffer = TSIOBufferCreate();
transform_ctx->output_reader = TSIOBufferReaderAlloc(transform_ctx->output_buffer);
transform_ctx->output_vio = TSVConnWrite(output_conn, contp, transform_ctx->output_reader, INT64_MAX);
}
if (!TSVIOBufferGet(input_vio)) {
TSVIONBytesSet(transform_ctx->output_vio, transform_ctx->total);
TSVIOReenable(transform_ctx->output_vio);
return 1;
}
if (transform_ctx->eos) {
return 1;
}
left = towrite = TSVIONTodoGet(input_vio);
upstream_done = TSVIONDoneGet(input_vio);
avail = TSIOBufferReaderAvail(input_reader);
eos = 0;
if (left <= avail)
eos = 1;
if (towrite > avail)
towrite = avail;
TSMutexLock(mtxp);
blk = TSIOBufferReaderStart(input_reader);
do {
start = TSIOBufferBlockReadStart(blk, input_reader, &blk_len);
lua_pushlightuserdata(L, transform_ctx);
lua_rawget(L, LUA_GLOBALSINDEX); /* push function */
if (towrite > blk_len) {
lua_pushlstring(L, start, (size_t)blk_len);
towrite -= blk_len;
} else {
lua_pushlstring(L, start, (size_t)towrite);
towrite = 0;
}
if (!towrite && eos) {
lua_pushinteger(L, 1); /* second param, not finish */
} else {
lua_pushinteger(L, 0); /* second param, not finish */
}
if (lua_pcall(L, 2, 2, 0)) {
fprintf(stderr, "lua_pcall failed: %s\n", lua_tostring(L, -1));
}
ret = lua_tointeger(L, -1); /* 0 is not finished, 1 is finished */
res = lua_tolstring(L, -2, &res_len);
if (res && res_len) {
TSIOBufferWrite(transform_ctx->output_buffer, res, res_len);
transform_ctx->total += res_len;
}
lua_pop(L, 2);
if (ret || (eos && !towrite)) { // EOS
eos = 1;
break;
}
blk = TSIOBufferBlockNext(blk);
} while (blk && towrite > 0);
TSMutexUnlock(mtxp);
TSIOBufferReaderConsume(input_reader, avail);
TSVIONDoneSet(input_vio, upstream_done + avail);
if (eos) {
transform_ctx->eos = 1;
TSVIONBytesSet(transform_ctx->output_vio, transform_ctx->total);
TSVIOReenable(transform_ctx->output_vio);
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
} else {
TSVIOReenable(transform_ctx->output_vio);
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_READY, input_vio);
}
return 1;
}
static int
ts_lua_cache_read(lua_State *L)
{
int64_t length, n, avail;
char *dst;
ts_lua_cont_info *ci;
ts_lua_cache_info *info;
ci = ts_lua_get_cont_info(L);
if (ci == NULL)
return 0;
n = lua_gettop(L);
if (n < 1) {
return luaL_error(L, "'ts.cache_read' requires parameter");
}
/* length */
if (n >= 2) {
if (!lua_isnumber(L, 2)) {
return luaL_error(L, "'ts.cache_read' second param is not number");
}
length = lua_tonumber(L, 2);
if (length <= 0) {
return luaL_error(L, "'ts.cache_read' second param is a not valid number");
}
} else {
length = INT64_MAX;
}
/* table */
if (!lua_istable(L, 1)) {
return luaL_error(L, "'ts.cache_read' first param is not valid");
}
lua_pushlstring(L, "info", sizeof("info") - 1);
lua_gettable(L, 1);
if (!lua_islightuserdata(L, -1)) {
return luaL_error(L, "'ts.cache_read' first param is not valid");
}
info = (ts_lua_cache_info*)lua_touserdata(L, -1);
lua_pop(L, 1);
if (info->hit == 0) {
return luaL_error(L, "'ts.cache_read' is reading from unhit doc");
}
if (info->optype != TS_LUA_CACHE_READ) {
return luaL_error(L, "'ts.cache_read' is reading from invalid vc");
}
if (info->eof || info->err) {
lua_pushnil(L);
return 1;
}
if (length != INT64_MAX) {
info->need += length;
} else {
info->need = INT64_MAX;
}
info->current_handler = &ts_lua_cache_handle_read;
avail = TSIOBufferReaderAvail(info->reserved.reader);
if (avail + info->already >= info->need) {
n = info->need - info->already;
dst = (char*)TSmalloc(n);
IOBufferReaderCopy(info->reserved.reader, dst, n);
lua_pushlstring(L, (char*)dst, n);
TSfree(dst);
info->already = info->need;
TSIOBufferReaderConsume(info->reserved.reader, n);
return 1;
}
if (info->ioh.vio == NULL) {
info->ioh.vio = TSVConnRead(info->cache_vc, info->contp, info->ioh.buffer, INT64_MAX);
} else {
TSVIOReenable(info->ioh.vio);
}
info->wait = 1;
return lua_yield(L, 0);
}
/*-------------------------------------------------------------------------
handle_transform
Get data from upstream vconn.
Parse it.
Include file if include tags found.
Copy data to downstream vconn.
Wake up upstream to get more data.
Input:
contp continuation for the current transaction
Output :
Return Value:
0 if failure
1 if success
-------------------------------------------------------------------------*/
static int
handle_transform(TSCont contp)
{
TSVConn output_conn;
TSVIO input_vio;
ContData *data;
TSIOBufferReader input_reader;
int toread, avail, psi, toconsume, towrite;
/* Get the output (downstream) vconnection where we'll write data to. */
output_conn = TSTransformOutputVConnGet(contp);
/* Get upstream vio */
input_vio = TSVConnWriteVIOGet(contp);
data = TSContDataGet(contp);
TSAssert(data->magic == MAGIC_ALIVE);
if (!data->output_buffer) {
data->output_buffer = TSIOBufferCreate();
data->output_reader = TSIOBufferReaderAlloc(data->output_buffer);
/* INT64_MAX because we don't know yet how much bytes we'll produce */
data->output_vio = TSVConnWrite(output_conn, contp, data->output_reader, INT64_MAX);
}
/* If the input VIO's buffer is NULL, the transformation is over */
if (!TSVIOBufferGet(input_vio)) {
TSDebug(DBG_TAG, "input_vio NULL, terminating transformation");
TSVIONBytesSet(data->output_vio, data->transform_bytes);
TSVIOReenable(data->output_vio);
return 1;
}
/* Determine how much data we have left to read. */
toread = TSVIONTodoGet(input_vio);
if (toread > 0) {
input_reader = TSVIOReaderGet(input_vio);
avail = TSIOBufferReaderAvail(input_reader);
/* There are some data available for reading. Let's parse it */
if (avail > 0) {
/* No need to parse data if there are too few bytes left to contain
an include command... */
if (toread > (PSI_START_TAG_LEN + PSI_END_TAG_LEN)) {
psi = parse_data(contp, input_reader, avail, &toconsume, &towrite);
} else {
towrite = avail;
toconsume = avail;
psi = 0;
}
if (towrite > 0) {
/* Update the total size of the doc so far */
data->transform_bytes += towrite;
/* Copy the data from the read buffer to the output buffer. */
/* TODO: Should we check the return value of TSIOBufferCopy() ? */
TSIOBufferCopy(TSVIOBufferGet(data->output_vio), TSVIOReaderGet(input_vio), towrite, 0);
/* Reenable the output connection so it can read the data we've produced. */
TSVIOReenable(data->output_vio);
}
if (toconsume > 0) {
/* Consume data we've processed an we are no longer interested in */
TSIOBufferReaderConsume(input_reader, toconsume);
/* Modify the input VIO to reflect how much data we've completed. */
TSVIONDoneSet(input_vio, TSVIONDoneGet(input_vio) + toconsume);
}
/* Did we find a psi filename to execute in the data ? */
if (psi) {
Job *new_job;
/* Add a request to include a file into the jobs queue.. */
/* We'll be called back once it's done with an EVENT_IMMEDIATE */
TSDebug(DBG_TAG, "Psi filename extracted. Adding an include job to thread queue.");
data->state = STATE_READ_PSI;
/* Create a new job request and add it to the queue */
new_job = job_create(contp, &psi_include, NULL);
add_to_queue(&job_queue, new_job);
/* Signal to the threads there is a new job */
thread_signal_job();
return 1;
}
}
}
/* Wake up upstream and downstream vconnections */
wake_up_streams(contp);
return 1;
}
static int
ts_lua_transform_handler(TSCont contp, ts_lua_http_transform_ctx *transform_ctx, TSEvent event, int n)
{
TSVConn output_conn;
TSVIO input_vio;
TSIOBufferReader input_reader;
TSIOBufferBlock blk;
int64_t toread, towrite, blk_len, upstream_done, input_avail, input_wm_bytes, l;
const char *start;
const char *res;
size_t res_len;
int ret, eos, write_down, rc, top, empty_input;
ts_lua_coroutine *crt;
ts_lua_cont_info *ci;
lua_State *L;
TSMutex mtxp;
ci = &transform_ctx->cinfo;
crt = &ci->routine;
mtxp = crt->mctx->mutexp;
L = crt->lua;
output_conn = TSTransformOutputVConnGet(contp);
input_vio = TSVConnWriteVIOGet(contp);
empty_input = 0;
if (!TSVIOBufferGet(input_vio)) {
if (transform_ctx->output.vio) {
TSDebug(TS_LUA_DEBUG_TAG, "[%s] reenabling output VIO after input VIO does not exist", __FUNCTION__);
TSVIONBytesSet(transform_ctx->output.vio, transform_ctx->total);
TSVIOReenable(transform_ctx->output.vio);
return 0;
} else {
TSDebug(TS_LUA_DEBUG_TAG, "[%s] no input VIO and output VIO", __FUNCTION__);
empty_input = 1;
}
} else { // input VIO exists
input_wm_bytes = TSIOBufferWaterMarkGet(TSVIOBufferGet(input_vio));
if (transform_ctx->upstream_watermark_bytes >= 0 && transform_ctx->upstream_watermark_bytes != input_wm_bytes) {
TSDebug(TS_LUA_DEBUG_TAG, "[%s] Setting input_vio watermark to %" PRId64 " bytes", __FUNCTION__,
transform_ctx->upstream_watermark_bytes);
TSIOBufferWaterMarkSet(TSVIOBufferGet(input_vio), transform_ctx->upstream_watermark_bytes);
}
}
if (empty_input == 0) {
input_reader = TSVIOReaderGet(input_vio);
}
if (!transform_ctx->output.buffer) {
transform_ctx->output.buffer = TSIOBufferCreate();
transform_ctx->output.reader = TSIOBufferReaderAlloc(transform_ctx->output.buffer);
transform_ctx->reserved.buffer = TSIOBufferCreate();
transform_ctx->reserved.reader = TSIOBufferReaderAlloc(transform_ctx->reserved.buffer);
if (empty_input == 0) {
transform_ctx->upstream_bytes = TSVIONBytesGet(input_vio);
} else {
transform_ctx->upstream_bytes = 0;
}
transform_ctx->downstream_bytes = INT64_MAX;
}
if (empty_input == 0) {
input_avail = TSIOBufferReaderAvail(input_reader);
upstream_done = TSVIONDoneGet(input_vio);
toread = TSVIONTodoGet(input_vio);
if (toread <= input_avail) { // upstream finished
eos = 1;
} else {
eos = 0;
}
} else {
input_avail = 0;
toread = 0;
eos = 1;
}
if (input_avail > 0) {
// move to the reserved.buffer
TSIOBufferCopy(transform_ctx->reserved.buffer, input_reader, input_avail, 0);
// reset input
TSIOBufferReaderConsume(input_reader, input_avail);
TSVIONDoneSet(input_vio, upstream_done + input_avail);
}
write_down = 0;
if (empty_input == 0) {
towrite = TSIOBufferReaderAvail(transform_ctx->reserved.reader);
} else {
towrite = 0;
}
TSMutexLock(mtxp);
ts_lua_set_cont_info(L, ci);
do {
if (event == TS_LUA_EVENT_COROUTINE_CONT) {
event = 0;
goto launch;
} else {
n = 2;
}
if (towrite == 0 && empty_input == 0) {
break;
}
if (empty_input == 0) {
blk = TSIOBufferReaderStart(transform_ctx->reserved.reader);
start = TSIOBufferBlockReadStart(blk, transform_ctx->reserved.reader, &blk_len);
lua_pushlightuserdata(L, transform_ctx);
lua_rawget(L, LUA_GLOBALSINDEX); /* push function */
if (towrite > blk_len) {
lua_pushlstring(L, start, (size_t)blk_len);
towrite -= blk_len;
TSIOBufferReaderConsume(transform_ctx->reserved.reader, blk_len);
} else {
lua_pushlstring(L, start, (size_t)towrite);
TSIOBufferReaderConsume(transform_ctx->reserved.reader, towrite);
towrite = 0;
}
if (!towrite && eos) {
lua_pushinteger(L, 1); /* second param, data finished */
} else {
lua_pushinteger(L, 0); /* second param, data not finish */
}
} else {
lua_pushlightuserdata(L, transform_ctx);
lua_rawget(L, LUA_GLOBALSINDEX); /* push function */
lua_pushlstring(L, "", 0);
lua_pushinteger(L, 1); /* second param, data finished */
}
launch:
rc = lua_resume(L, n);
top = lua_gettop(L);
switch (rc) {
case LUA_YIELD: // coroutine yield
TSMutexUnlock(mtxp);
return 0;
case 0: // coroutine success
if (top == 2) {
ret = lua_tointeger(L, -1); /* 0 is not finished, 1 is finished */
res = lua_tolstring(L, -2, &res_len);
} else { // what hells code are you writing ?
ret = 0;
res = NULL;
res_len = 0;
}
break;
default: // coroutine failed
TSError("[ts_lua] lua_resume failed: %s", lua_tostring(L, -1));
ret = 1;
res = NULL;
res_len = 0;
break;
}
if (res && res_len > 0) {
if (!transform_ctx->output.vio) {
l = transform_ctx->downstream_bytes;
if (ret) {
l = res_len;
}
transform_ctx->output.vio = TSVConnWrite(output_conn, contp, transform_ctx->output.reader, l); // HttpSM go on
}
TSIOBufferWrite(transform_ctx->output.buffer, res, res_len);
transform_ctx->total += res_len;
write_down = 1;
}
lua_pop(L, top);
if (ret || (eos && !towrite)) { // EOS
eos = 1;
break;
}
} while (towrite > 0);
TSMutexUnlock(mtxp);
if (eos && !transform_ctx->output.vio) {
transform_ctx->output.vio = TSVConnWrite(output_conn, contp, transform_ctx->output.reader, 0);
}
if (write_down || eos) {
TSVIOReenable(transform_ctx->output.vio);
}
if (toread > input_avail) { // upstream not finished.
if (eos) {
TSVIONBytesSet(transform_ctx->output.vio, transform_ctx->total);
if (empty_input == 0) {
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_EOS, input_vio);
}
} else {
if (empty_input == 0) {
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_READY, input_vio);
}
}
} else { // upstream is finished.
TSVIONBytesSet(transform_ctx->output.vio, transform_ctx->total);
if (empty_input == 0) {
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
}
}
return 0;
}
static int
ts_http_fetcher_verify_chunked(http_fetcher *fch, int code)
{
int n;
int64_t avail, need;
int64_t blk_len;
const char *start;
const char *cur;
TSIOBufferBlock blk, next_blk;
chunked_info *ci = &fch->cinfo;
blk = TSIOBufferReaderStart(fch->flow_reader);
while (blk) {
next_blk = TSIOBufferBlockNext(blk);
start = TSIOBufferBlockReadStart(blk, fch->flow_reader, &blk_len);
avail = blk_len;
if (avail) {
do {
cur = start + blk_len - avail;
switch (ci->state) {
case CHUNK_WAIT_LENGTH:
n = chunked_extract_frag_len(ci, cur, avail);
if (n < 0)
return BODY_ERROR;
avail -= n;
if (!ci->dechunk_enabled)
TSIOBufferCopy(fch->body_buffer, fch->flow_reader, n, 0);
TSIOBufferReaderConsume(fch->flow_reader, n);
break;
case CHUNK_WAIT_RETURN:
n = chunked_extract_return(ci, cur, avail, 0);
avail -= n;
if (!ci->dechunk_enabled)
TSIOBufferCopy(fch->body_buffer, fch->flow_reader, n, 0);
TSIOBufferReaderConsume(fch->flow_reader, n);
break;
case CHUNK_WAIT_DATA:
if (ci->frag_len + avail <= ci->frag_total) {
TSIOBufferCopy(fch->body_buffer, fch->flow_reader, avail, 0);
TSIOBufferReaderConsume(fch->flow_reader, avail);
ci->frag_len += avail;
avail = 0;
break;
} else {
need = ci->frag_total - ci->frag_len;
if (need) {
TSIOBufferCopy(fch->body_buffer, fch->flow_reader, need, 0);
TSIOBufferReaderConsume(fch->flow_reader, need);
ci->frag_len += need;
avail -= need;
}
ci->cr = 0;
ci->state = CHUNK_WAIT_RETURN_END;
}
break;
case CHUNK_WAIT_RETURN_END:
n = chunked_extract_return(ci, cur, avail, 1);
avail -= n;
if (!ci->dechunk_enabled)
TSIOBufferCopy(fch->body_buffer, fch->flow_reader, n, 0);
TSIOBufferReaderConsume(fch->flow_reader, n);
break;
case CHUNK_DATA_DONE:
if (!ci->dechunk_enabled)
TSIOBufferCopy(fch->body_buffer, fch->flow_reader, avail, 0);
TSIOBufferReaderConsume(fch->flow_reader, avail);
avail = 0;
ci->done = 1;
break;
default:
break;
}
} while (avail > 0);
}
if (ci->done)
break;
blk = next_blk;
}
if (ci->done) {
return BODY_COMPLETE;
} else if (code == BODY_COMPLETE) {
return BODY_ERROR;
} else {
return BODY_READY;
}
}
/**
* Process data from ATS.
*
* Process data from one of the ATS events.
*
* @param[in,out] contp - the continuation
* @param[in,out] ibd - the filter descriptor
*/
static void process_data(TSCont contp, ibd_ctx *ibd)
{
int64_t ntodo;
int64_t navail;
TSIOBufferReader input_reader, output_reader;
TSIOBufferBlock block;
const char *buf;
int64_t nbytes;
ib_status_t rc;
tsib_filter_ctx *fctx = ibd->data;
tsib_txn_ctx *txndata = TSContDataGet(contp);
TSVIO input_vio = TSVConnWriteVIOGet(contp);
TSIOBuffer in_buf = TSVIOBufferGet(input_vio);
/* Test whether we're going into an errordoc */
if (HTTP_CODE(txndata->status)) { /* We're going to an error document,
* so we discard all this data
*/
ib_log_debug2_tx(txndata->tx, "Status is %d, discarding", txndata->status);
ibd->data->buffering = IOBUF_DISCARD;
}
/* Test for EOS */
if (in_buf == NULL) {
if (fctx->output_buffer != NULL) {
/* flush anything we have buffered. This is final! */
rc = flush_data(fctx, -1, 1);
switch(rc) {
case IB_OK:
break;
case IB_EBADVAL:
ib_log_error_tx(txndata->tx, "Bad/Inconsistent stream edit(s) ignored.");
break;
default: /* Can't happen unless a new status is introduced */
ib_log_error_tx(txndata->tx, "Unhandled return value %d", rc);
break;
}
}
else {
/* I guess NULL input may mean something other than EOS.
* This appears to be possible when
* processing an HTTP error from the backend.
*/
ib_log_debug2_tx(txndata->tx, "Filter input was null. No filtering.");
/* RNS-1268: seems we may have to go through all the motions
* of creating and enabling an output_vio with no data.
*/
fctx->output_buffer = TSIOBufferCreate();
ib_mm_register_cleanup(txndata->tx->mm,
(ib_mm_cleanup_fn_t) TSIOBufferDestroy,
(void*) fctx->output_buffer);
output_reader = TSIOBufferReaderAlloc(fctx->output_buffer);
fctx->output_vio = TSVConnWrite(TSTransformOutputVConnGet(contp), contp, output_reader, 0);
TSVIOReenable(fctx->output_vio);
}
return;
}
/* Test for first time, and initialise. */
if (!fctx->output_buffer) {
// FIXME - What to choose here and why?
int64_t output_vio_sz = TSVIONBytesGet(input_vio);
// NOTE: Using INT64_MAX asserts on 4.2.2: InkAPI.cc:6261: failed assert `sdk_sanity_check_iocore_structure(connp) == TS_SUCCESS`
//int64_t output_vio_sz = INT64_MAX;
// NOTE: Does it matter that this is only INT32_MAX as in the examples?
// int64_t output_vio_sz = INT32_MAX;
//int64_t output_vio_sz = fctx->have_edits
// ? INT64_MAX
// : TSVIONBytesGet(input_vio);
fctx->output_buffer = TSIOBufferCreate();
ib_mm_register_cleanup(txndata->tx->mm,
(ib_mm_cleanup_fn_t) TSIOBufferDestroy,
(void*) fctx->output_buffer);
// FIXME - Where is TSIOBufferReaderFree()?
output_reader = TSIOBufferReaderAlloc(fctx->output_buffer);
fctx->output_vio = TSVConnWrite(TSTransformOutputVConnGet(contp), contp, output_reader, output_vio_sz);
fctx->buffer = TSIOBufferCreate();
ib_mm_register_cleanup(txndata->tx->mm,
(ib_mm_cleanup_fn_t) TSIOBufferDestroy,
(void*) fctx->buffer);
// FIXME - Where is TSIOBufferReaderFree()?
fctx->reader = TSIOBufferReaderAlloc(fctx->buffer);
/* Get the buffering config */
if (!HTTP_CODE(txndata->status)) {
buffer_init(ibd, txndata->tx);
}
}
/* Get any unprocessed bytes. */
ntodo = TSVIONTodoGet(input_vio);
/* Test for EOS */
if (ntodo == 0) {
ib_log_debug2_tx(txndata->tx, "ntodo zero before consuming data");
flush_data(fctx, -1, 1);
/* Call back the input VIO continuation to let it know that we
* have completed the write operation.
*/
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
return;
}
/* OK, there's some input awaiting our attention */
input_reader = TSVIOReaderGet(input_vio);
while (navail = TSIOBufferReaderAvail(input_reader), navail > 0) {
block = TSIOBufferReaderStart(input_reader);
buf = TSIOBufferBlockReadStart(block, input_reader, &nbytes);
rc = (*ibd->ibd->ib_notify_body)(txndata->tx->ib, txndata->tx, buf, nbytes);
if (rc != IB_OK) {
ib_log_error_tx(txndata->tx, "Error %d notifying body data.", rc);
}
rc = buffer_data_chunk(fctx, input_reader, nbytes);
switch (rc) {
case IB_EAGAIN:
case IB_OK:
break;
case IB_EBADVAL:
ib_log_error_tx(txndata->tx, "Bad/Inconsistent stream edit(s) ignored.");
break;
default: /* Can't happen unless a new status is introduced */
ib_log_error_tx(txndata->tx, "Unhandled return value %d", rc);
break;
}
TSIOBufferReaderConsume(input_reader, nbytes);
TSVIONDoneSet(input_vio, TSVIONDoneGet(input_vio) + nbytes);
}
ntodo = TSVIONTodoGet(input_vio);
if (ntodo == 0) {
ib_log_debug2_tx(txndata->tx, "ntodo zero after consuming data");
flush_data(fctx, -1, 1);
/* Call back the input VIO continuation to let it know that we
* have completed the write operation.
*/
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
}
else {
/* Call back the input VIO continuation to let it know that we
* are ready for more data.
*/
TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_READY, input_vio);
}
}
/**
* Function to flush buffered data and apply edits in-stream
*
* @param[in] fctx - the filter data
* @param[in] nbytes - number of bytes to flush (-1 to flush all data)
* @param[in] last - final flush indicator (no more data to come)
* @return success or error status
*/
static ib_status_t flush_data(tsib_filter_ctx *fctx, int64_t nbytes, int last)
{
/* copy logic from mod_range_filter.
*
*
* It's a push logic, so that'll be range_filter's output filter
*
* Note: We're not buffering anything here. We only see data
* when they're flushed from the buffer!
*/
ib_status_t rc = IB_OK;
int nedits, i;
size_t n, start;
if (nbytes == -1) {
/* just output all we have */
nbytes = fctx->buffered;
}
if ((fctx->edits != NULL) && (fctx->edits->len > 0)) {
/* Sort to reverse order, so we can pop elements simply by
* decrementing len
*/
nedits = fctx->edits->len/sizeof(edit_t);
qsort(fctx->edits->data, nedits, sizeof(edit_t), qcompare);
for (i = nedits-1; i >= 0; --i) {
edit_t *edit = &((edit_t*) fctx->edits->data)[i];
/* sanity-check that edit is in range */
if (edit->start < fctx->bytes_done) {
/* Edit applies to data already gone. This probably means
* someone fed us overlapping edits
*/
rc = IB_EBADVAL;
/* Abandon this edit. Continue loop (next edit may be fine) */
fctx->edits->len -= sizeof(edit_t);
continue;
}
else if (edit->start + edit->bytes > fctx->bytes_done + nbytes) {
/* Edit goes beyond data we're dealing with.
* So leave it for next time.
* This could affect buffering behaviour, but in a good cause
* If this is out-of-range then so are other edits,
* but they'll be in range when we have more data.
*
* Best we can do now is to flush data before this edit.
* by setting nbytes.
*
* Exception: if it's the last call, this edit is out-of-range
* so we just abandon it.
*/
if (!last) {
nbytes = edit->start - fctx->bytes_done;
rc = IB_EAGAIN;
break;
}
else {
fctx->edits->len -= sizeof(edit_t);
rc = IB_EBADVAL;
continue;
}
}
/* copy data up to start-of-edit */
start = edit->start - fctx->bytes_done;
while (start > 0) {
n = TSIOBufferCopy(fctx->output_buffer, fctx->reader, start, 0);
assert (n > 0); // FIXME - handle error
TSIOBufferReaderConsume(fctx->reader, n);
fctx->buffered -= n;
fctx->bytes_done += n;
nbytes -= n;
start -= n;
}
/* Discard anything that's being deleted */
TSIOBufferReaderConsume(fctx->reader, edit->bytes);
nbytes -= edit->bytes;
fctx->buffered -= edit->bytes;
fctx->bytes_done += edit->bytes;
/* Insert replacement string */
n = TSIOBufferWrite(fctx->output_buffer, edit->repl, edit->repl_len);
assert(n == edit->repl_len); // FIXME (if this ever happens)!
/* Record change to data size */
fctx->offs += edit->repl_len - edit->bytes;
/* We're done with this edit. */
fctx->edits->len -= sizeof(edit_t);
}
}
/* There's no (more) editing to do, so we can just move data to output
* using TS native refcounted pointer ops
*/
while (nbytes > 0) {
n = TSIOBufferCopy(fctx->output_buffer, fctx->reader, nbytes, 0);
assert (n > 0); // FIXME - handle error
TSIOBufferReaderConsume(fctx->reader, n);
fctx->buffered -= n;
fctx->bytes_done += n;
nbytes -= n;
}
if (last) {
// TODO - Do we need to add this to what is there vs just set it as we are now?
/* Now we can tell downstream exactly how much data it has */
TSVIONBytesSet(fctx->output_vio, fctx->bytes_done + fctx->offs);
}
TSVIOReenable(fctx->output_vio);
return rc;
}
static int
handle_buffering(TSCont contp, MyData *data)
{
TSVIO write_vio;
int towrite;
int avail;
/* Get the write VIO for the write operation that was performed on
ourself. This VIO contains the buffer that we are to read from
as well as the continuation we are to call when the buffer is
empty. */
write_vio = TSVConnWriteVIOGet(contp);
/* Create the output buffer and its associated reader */
if (!data->output_buffer) {
data->output_buffer = TSIOBufferCreate();
TSAssert(data->output_buffer);
data->output_reader = TSIOBufferReaderAlloc(data->output_buffer);
TSAssert(data->output_reader);
}
/* We also check to see if the write VIO's buffer is non-NULL. A
NULL buffer indicates that the write operation has been
shutdown and that the continuation does not want us to send any
more WRITE_READY or WRITE_COMPLETE events. For this buffered
transformation that means we're done buffering data. */
if (!TSVIOBufferGet(write_vio)) {
data->state = STATE_OUTPUT_DATA;
return 0;
}
/* Determine how much data we have left to read. For this bnull
transform plugin this is also the amount of data we have left
to write to the output connection. */
towrite = TSVIONTodoGet(write_vio);
if (towrite > 0) {
/* The amount of data left to read needs to be truncated by
the amount of data actually in the read buffer. */
avail = TSIOBufferReaderAvail(TSVIOReaderGet(write_vio));
if (towrite > avail) {
towrite = avail;
}
if (towrite > 0) {
/* Copy the data from the read buffer to the input buffer. */
TSIOBufferCopy(data->output_buffer, TSVIOReaderGet(write_vio), towrite, 0);
/* Tell the read buffer that we have read the data and are no
longer interested in it. */
TSIOBufferReaderConsume(TSVIOReaderGet(write_vio), towrite);
/* Modify the write VIO to reflect how much data we've
completed. */
TSVIONDoneSet(write_vio, TSVIONDoneGet(write_vio) + towrite);
}
}
/* Now we check the write VIO to see if there is data left to read. */
if (TSVIONTodoGet(write_vio) > 0) {
if (towrite > 0) {
/* Call back the write VIO continuation to let it know that we
are ready for more data. */
TSContCall(TSVIOContGet(write_vio), TS_EVENT_VCONN_WRITE_READY, write_vio);
}
} else {
data->state = STATE_OUTPUT_DATA;
/* Call back the write VIO continuation to let it know that we
have completed the write operation. */
TSContCall(TSVIOContGet(write_vio), TS_EVENT_VCONN_WRITE_COMPLETE, write_vio);
}
return 1;
}
static int
ts_lua_cache_handle_read(ts_lua_cont_info *ci, ts_lua_cache_info *info, TSEvent event, void *edata)
{
lua_State *L;
TSMutex mtx;
char *dst;
int64_t avail, n;
n = 0;
switch (event) {
case TS_EVENT_VCONN_READ_READY:
avail = TSIOBufferReaderAvail(info->ioh.reader);
if (avail > 0) {
TSIOBufferCopy(info->reserved.buffer, info->ioh.reader, avail, 0);
TSIOBufferReaderConsume(info->ioh.reader, avail);
}
avail = TSIOBufferReaderAvail(info->reserved.reader);
if (avail + info->already >= info->need) {
n = info->need - info->already;
} else {
TSVIOReenable(info->ioh.vio);
}
break;
case TS_EVENT_VCONN_READ_COMPLETE:
case TS_EVENT_VCONN_EOS:
avail = TSIOBufferReaderAvail(info->ioh.reader);
if (avail > 0) {
TSIOBufferCopy(info->reserved.buffer, info->ioh.reader, avail, 0);
TSIOBufferReaderConsume(info->ioh.reader, avail);
}
n = TSIOBufferReaderAvail(info->reserved.reader);
info->eof = 1;
break;
default: // error
info->err = 1;
break;
}
if (info->wait && (n > 0 || info->eof || info->err)) { // resume
L = ci->routine.lua;
mtx = ci->routine.mctx->mutexp;
TSMutexLock(mtx);
if (n > 0) {
dst = TSmalloc(n);
IOBufferReaderCopy(info->reserved.reader, dst, n);
lua_pushlstring(L, (char*)dst, n);
TSfree(dst);
info->already += n;
TSIOBufferReaderConsume(info->reserved.reader, n);
} else {
lua_pushnil(L);
}
info->wait = 0;
TSContCall(ci->contp, TS_LUA_EVENT_COROUTINE_CONT, (void*)1);
TSMutexUnlock(mtx);
}
return 0;
}
static void
handle_transform(TSCont contp)
{
TSVConn output_conn;
TSVIO write_vio;
MyData *data;
int64_t towrite;
/* Get the output connection where we'll write data to. */
output_conn = TSTransformOutputVConnGet(contp);
/* Get the write VIO for the write operation that was performed on
ourself. This VIO contains the buffer that we are to read from
as well as the continuation we are to call when the buffer is
empty. */
write_vio = TSVConnWriteVIOGet(contp);
/* Get our data structure for this operation. The private data
structure contains the output VIO and output buffer. If the
private data structure pointer is NULL, then we'll create it
and initialize its internals. */
data = TSContDataGet(contp);
if (!data) {
towrite = TSVIONBytesGet(write_vio);
if (towrite != INT64_MAX) {
towrite += append_buffer_length;
}
data = my_data_alloc();
data->output_buffer = TSIOBufferCreate();
data->output_reader = TSIOBufferReaderAlloc(data->output_buffer);
data->output_vio = TSVConnWrite(output_conn, contp, data->output_reader, towrite);
TSContDataSet(contp, data);
}
/* We also check to see if the write VIO's buffer is non-NULL. A
NULL buffer indicates that the write operation has been
shutdown and that the continuation does not want us to send any
more WRITE_READY or WRITE_COMPLETE events. For this simplistic
transformation that means we're done. In a more complex
transformation we might have to finish writing the transformed
data to our output connection. */
if (!TSVIOBufferGet(write_vio)) {
if (data->append_needed) {
data->append_needed = 0;
TSIOBufferCopy(TSVIOBufferGet(data->output_vio), append_buffer_reader, append_buffer_length, 0);
}
TSVIONBytesSet(data->output_vio, TSVIONDoneGet(write_vio) + append_buffer_length);
TSVIOReenable(data->output_vio);
return;
}
/* Determine how much data we have left to read. For this append
transform plugin this is also the amount of data we have left
to write to the output connection. */
towrite = TSVIONTodoGet(write_vio);
if (towrite > 0) {
/* The amount of data left to read needs to be truncated by
the amount of data actually in the read buffer. */
int64_t avail = TSIOBufferReaderAvail(TSVIOReaderGet(write_vio));
if (towrite > avail) {
towrite = avail;
}
if (towrite > 0) {
/* Copy the data from the read buffer to the output buffer. */
TSIOBufferCopy(TSVIOBufferGet(data->output_vio), TSVIOReaderGet(write_vio), towrite, 0);
/* Tell the read buffer that we have read the data and are no
longer interested in it. */
TSIOBufferReaderConsume(TSVIOReaderGet(write_vio), towrite);
/* Modify the write VIO to reflect how much data we've
completed. */
TSVIONDoneSet(write_vio, TSVIONDoneGet(write_vio) + towrite);
}
}
/* Now we check the write VIO to see if there is data left to
read. */
if (TSVIONTodoGet(write_vio) > 0) {
if (towrite > 0) {
/* If there is data left to read, then we reenable the output
connection by reenabling the output VIO. This will wakeup
the output connection and allow it to consume data from the
output buffer. */
TSVIOReenable(data->output_vio);
/* Call back the write VIO continuation to let it know that we
are ready for more data. */
TSContCall(TSVIOContGet(write_vio), TS_EVENT_VCONN_WRITE_READY, write_vio);
}
} else {
if (data->append_needed) {
data->append_needed = 0;
TSIOBufferCopy(TSVIOBufferGet(data->output_vio), append_buffer_reader, append_buffer_length, 0);
}
/* If there is no data left to read, then we modify the output
VIO to reflect how much data the output connection should
expect. This allows the output connection to know when it
is done reading. We then reenable the output connection so
that it can consume the data we just gave it. */
TSVIONBytesSet(data->output_vio, TSVIONDoneGet(write_vio) + append_buffer_length);
TSVIOReenable(data->output_vio);
/* Call back the write VIO continuation to let it know that we
have completed the write operation. */
TSContCall(TSVIOContGet(write_vio), TS_EVENT_VCONN_WRITE_COMPLETE, write_vio);
}
}