// Request the info of a particular sockaddr_in.
// Reject info request if response length is greater than max_response_length.
// Return 0 on success and -1 on error.
int
citrusleaf_info_host_limit(struct sockaddr_in *sa_in, char *names, char **values, int timeout_ms, bool send_asis, uint64_t max_response_length)
{
int rv = -1;
int io_rv;
*values = 0;
// Deal with the incoming 'names' parameter
// Translate interior ';' in the passed-in names to \n
uint32_t slen = 0;
if (names) {
if (send_asis) {
slen = strlen(names);
} else {
char *_t = names;
while (*_t) {
slen++;
if ((*_t == ';') || (*_t == ':') || (*_t == ',')) *_t = '\n';
_t++;
}
}
}
// Sometimes people forget/cant add the trailing '\n'. Be nice and add it for them.
// using a stack allocated variable so we dn't have to clean up, Pain in the ass syntactically
// but a nice little thing
if (names) {
if (names[slen-1] == '\n') {
slen = 0;
} else {
slen++; if (slen > 1024) { return(-1); }
}
}
char names_with_term[slen+1];
if (slen) {
strcpy(names_with_term, names);
names_with_term[slen-1] = '\n';
names_with_term[slen] = 0;
names = names_with_term;
}
// Actually doing a non-blocking connect
int fd = cf_socket_create_and_connect_nb(sa_in);
if (fd == -1) {
return -1;
}
cl_proto *req;
uint8_t buf[1024];
uint buf_sz;
// Un-initialized buf can lead to junk lastshiptimes values.
// Initialize buf to 0.
bzero(buf, 1024);
if (names) {
uint sz = strlen(names);
buf_sz = sz + sizeof(cl_proto);
if (buf_sz < 1024)
req = (cl_proto *) buf;
else
req = (cl_proto *) malloc(buf_sz);
if (req == NULL) goto Done;
req->sz = sz;
memcpy(req->data,names,sz);
}
else {
req = (cl_proto *) buf;
req->sz = 0;
buf_sz = sizeof(cl_proto);
names = "";
}
req->version = CL_PROTO_VERSION;
req->type = CL_PROTO_TYPE_INFO;
cl_proto_swap(req);
if (timeout_ms)
io_rv = cf_socket_write_timeout(fd, (uint8_t *) req, buf_sz, 0, timeout_ms);
else
io_rv = cf_socket_write_forever(fd, (uint8_t *) req, buf_sz);
if ((uint8_t *)req != buf) free(req);
if (io_rv != 0) {
#ifdef DEBUG
cf_debug("info returned error, rv %d errno %d bufsz %d", io_rv, errno, buf_sz);
#endif
goto Done;
}
cl_proto *rsp = (cl_proto *)buf;
if (timeout_ms)
io_rv = cf_socket_read_timeout(fd, buf, 8, 0, timeout_ms);
else
io_rv = cf_socket_read_forever(fd, buf, 8);
if (0 != io_rv) {
#ifdef DEBUG
cf_debug("info socket read failed: rv %d errno %d", io_rv, errno);
#endif
goto Done;
}
cl_proto_swap(rsp);
if (rsp->sz) {
size_t read_length = rsp->sz;
bool limit_reached = false;
if (max_response_length > 0 && rsp->sz > max_response_length) {
// Response buffer is too big. Read a few bytes just to see what the buffer contains.
read_length = 100;
limit_reached = true;
}
uint8_t *v_buf = malloc(read_length + 1);
if (!v_buf) {
cf_warn("Info request '%s' failed. Failed to malloc %d bytes", names, read_length);
goto Done;
}
if (timeout_ms)
io_rv = cf_socket_read_timeout(fd, v_buf, read_length, 0, timeout_ms);
else
io_rv = cf_socket_read_forever(fd, v_buf, read_length);
if (io_rv != 0) {
free(v_buf);
if (io_rv != ETIMEDOUT) {
cf_warn("Info request '%s' failed. Failed to read %d bytes. Return code %d", names, read_length, io_rv);
}
goto Done;
}
v_buf[read_length] = 0;
if (limit_reached) {
// Response buffer is too big. Log warning and reject.
cf_warn("Info request '%s' failed. Response buffer length %lu is excessive. Buffer: %s", names, rsp->sz, v_buf);
goto Done;
}
*values = (char *) v_buf;
}
else {
*values = 0;
}
rv = 0;
Done:
shutdown(fd, SHUT_RDWR);
close(fd);
return(rv);
}
static void*
async_receiver_fn(void *thdata)
{
int rv = -1;
bool network_error = false;
cl_async_work *workitem = NULL;
// cl_async_work *tmpworkitem = NULL;
as_msg msg;
cf_queue *q_to_use = NULL;
cl_cluster_node *thisnode = NULL;
uint8_t rd_stack_buf[STACK_BUF_SZ];
uint8_t *rd_buf = rd_stack_buf;
size_t rd_buf_sz = 0;
uint64_t acktrid;
// uint64_t starttime, endtime;
int progress_timeout_ms;
unsigned int thread_id = cf_atomic32_incr(&g_thread_count);
if (thdata == NULL) {
q_to_use = g_cl_async_q;
} else {
thisnode = (cl_cluster_node *)thdata;
q_to_use = thisnode->asyncwork_q;
}
//Infinite loop which keeps picking work items from the list and try to find the end result
while(1) {
network_error = false;
#if ONEASYNCFD
if(thisnode->dunned == true) {
do {
rv = cf_queue_pop(thisnode->asyncwork_q, &workitem, CF_QUEUE_NOWAIT);
if (rv == CF_QUEUE_OK) {
cl_cluster_node_put(thisnode);
free(workitem);
}
} while (rv == CF_QUEUE_OK);
//We want to delete all the workitems of this node
shash_reduce_delete(g_cl_async_hashtab, cl_del_node_asyncworkitems, thisnode);
break;
}
#endif
//This call will block if there is no element in the queue
cf_queue_pop(q_to_use, &workitem, CF_QUEUE_FOREVER);
//TODO: What if the node gets dunned while this pop call is blocked ?
#if ONEASYNCFD
//cf_debug("Elements remaining in this node's queue=%d, Hash table size=%d",
// cf_queue_sz(thisnode->asyncwork_q), shash_get_size(g_cl_async_hashtab));
#endif
// If we have no progress in 50ms, we should move to the next workitem
// and revisit this workitem at a later stage
progress_timeout_ms = DEFAULT_PROGRESS_TIMEOUT;
// Read into this fine cl_msg, which is the short header
rv = cf_socket_read_timeout(workitem->fd, (uint8_t *) &msg, sizeof(as_msg), workitem->deadline, progress_timeout_ms);
if (rv) {
#if DEBUG
cf_debug("Citrusleaf: error when reading header from server - rv %d fd %d", rv, workitem->fd);
#endif
if (rv != ETIMEDOUT) {
cf_error("Citrusleaf: error when reading header from server - rv %d fd %d",rv,workitem->fd);
network_error = true;
goto Error;
} else {
goto Retry;
}
}
#ifdef DEBUG_VERBOSE
dump_buf("read header from cluster", (uint8_t *) &msg, sizeof(cl_msg));
#endif
cl_proto_swap(&msg.proto);
cl_msg_swap_header(&msg.m);
// second read for the remainder of the message
rd_buf_sz = msg.proto.sz - msg.m.header_sz;
if (rd_buf_sz > 0) {
if (rd_buf_sz > sizeof(rd_stack_buf)) {
rd_buf = malloc(rd_buf_sz);
if (!rd_buf) {
cf_error("malloc fail: trying %zu",rd_buf_sz);
rv = -1;
goto Error;
}
}
rv = cf_socket_read_timeout(workitem->fd, rd_buf, rd_buf_sz, workitem->deadline, progress_timeout_ms);
if (rv) {
//We already read some part of the message before but failed to read the
//remaining data for whatever reason (network error or timeout). We cannot
//reread as we already read partial data. Declare this as error.
cf_error("Timeout after reading the header but before reading the body");
goto Error;
}
#ifdef DEBUG_VERBOSE
dump_buf("read body from cluster", rd_buf, rd_buf_sz);
#endif
}
rv = CITRUSLEAF_OK;
goto Ok;
Retry:
//We are trying to postpone the reading
if (workitem->deadline && workitem->deadline < cf_getms()) {
cf_error("async receiver: out of time : deadline %"PRIu64" now %"PRIu64,
workitem->deadline, cf_getms());
//cf_error("async receiver: Workitem missed the final deadline");
rv = CITRUSLEAF_FAIL_TIMEOUT;
goto Error;
} else {
//We have time. Push the element back to the queue to be considered later
cf_queue_push(q_to_use, &workitem);
}
//If we allocated memory in this loop, release it.
if (rd_buf && (rd_buf != rd_stack_buf)) {
free(rd_buf);
}
cf_atomic_int_incr(&g_async_stats.retries);
continue;
Error:
if (network_error == true) {
/*
* In case of Async work (for XDS), it may be extreme to
* dun a node in case of network error. We just cleanup
* things and retry to connect to the remote cluster.
* The network error may be a transient one.
*/
}
#if ONEASYNCFD
//Do not close FD
#else
//We do not know the state of FD. It may have pending data to be read.
//We cannot reuse the FD. So, close it to be on safe side.
cf_error("async receiver: Closing the fd %d because of error", workitem->fd);
cf_close(workitem->fd);
workitem->fd = -1;
#endif
cf_atomic_int_incr(&g_async_stats.dropouts);
//Continue down with what we do during an Ok
//Inform the caller that there is no response from the server for this workitem.
//No response does not mean that the work is not done. The work might be
//successfully completed on the server side, we just didnt get response for it.
if (g_fail_cb_fn) {
g_fail_cb_fn(workitem->udata, rv, workitem->starttime);
}
Ok:
//rd_buf may not be there during an error condition.
if (rd_buf && (rv == CITRUSLEAF_OK)) {
//As of now, async functionality is there only for put call.
//In put call, we do not get anything back other than the trid field.
//So, just pass variable to get back the trid and ignore others.
if (0 != cl_parse(&msg.m, rd_buf, rd_buf_sz, NULL, NULL, NULL, &acktrid, NULL)) {
rv = CITRUSLEAF_FAIL_UNKNOWN;
}
else {
rv = msg.m.result_code;
if (workitem->trid != acktrid) {
#if ONEASYNCFD
//It is likely that we may get response for a different trid.
//Just delete the correct one from the queue
//put back the current workitem back in the queue.
shash_get(g_cl_async_hashtab, &acktrid, &tmpworkitem);
cf_queue_delete(q_to_use, &tmpworkitem, true);
cf_queue_push(q_to_use, &workitem);
//From now on workitem will be the one for which we got ack
workitem = tmpworkitem;
#endif
#ifdef DEBUG
cf_debug("Got reply for a different trid. Expected=%"PRIu64" Got=%"PRIu64" FD=%d",
workitem->trid, acktrid, workitem->fd);
#endif
}
}
if (g_success_cb_fn) {
g_success_cb_fn(workitem->udata, rv, workitem->starttime);
}
}
//Remember to put back the FD into the pool, if it is re-usable.
if (workitem->fd != -1) {
cl_cluster_node_fd_put(workitem->node, workitem->fd, true);
}
//Also decrement the reference count for this node
cl_cluster_node_put(workitem->node);
#if ONEASYNCFD
//Delete the item from the global hashtable
if (shash_delete(g_cl_async_hashtab, &workitem->trid) != SHASH_OK)
{
#if DEBUG
cf_debug("Failure while trying to delete trid=%"PRIu64" from hashtable", workitem->trid);
#endif
}
#endif
//Push it back into the free pool. If the attempt fails, free it.
if (cf_queue_push(g_cl_workitems_freepool_q, &workitem) == -1) {
free(workitem);
}
//If we allocated memory in this loop, release it.
if (rd_buf && (rd_buf != rd_stack_buf)) {
free(rd_buf);
}
// Kick this thread out if its ID is greater than total
if (thread_id > cf_atomic32_get(g_async_num_threads)) {
cf_atomic32_decr(&g_thread_count);
return NULL;
}
}//The infnite loop
return NULL;
}
