static void
jsonrpc_cleanup(struct jsonrpc *rpc)
{
stream_close(rpc->stream);
rpc->stream = NULL;
json_parser_abort(rpc->parser);
rpc->parser = NULL;
jsonrpc_msg_destroy(rpc->received);
rpc->received = NULL;
ofpbuf_list_delete(&rpc->output);
rpc->backlog = 0;
}
static struct ovsdb_schema *
fetch_schema(struct jsonrpc *rpc, const char *database)
{
struct jsonrpc_msg *request, *reply;
struct ovsdb_schema *schema;
request = jsonrpc_create_request("get_schema",
json_array_create_1(
json_string_create(database)),
NULL);
check_txn(jsonrpc_transact_block(rpc, request, &reply), &reply);
check_ovsdb_error(ovsdb_schema_from_json(reply->result, &schema));
jsonrpc_msg_destroy(reply);
return schema;
}
/* Schedules 'msg' to be sent on 'rpc' and returns 'rpc''s status (as with
* jsonrpc_get_status()).
*
* If 'msg' cannot be sent immediately, it is appended to a buffer. The caller
* is responsible for ensuring that the amount of buffered data is somehow
* limited. (jsonrpc_get_backlog() returns the amount of data currently
* buffered in 'rpc'.)
*
* Always takes ownership of 'msg', regardless of success. */
int
jsonrpc_send(struct jsonrpc *rpc, struct jsonrpc_msg *msg)
{
struct ofpbuf *buf;
struct json *json;
size_t length;
char *s;
if (rpc->status) {
jsonrpc_msg_destroy(msg);
return rpc->status;
}
jsonrpc_log_msg(rpc, "send", msg);
json = jsonrpc_msg_to_json(msg);
s = json_to_string(json, 0);
length = strlen(s);
json_destroy(json);
buf = xmalloc(sizeof *buf);
ofpbuf_use(buf, s, length);
buf->size = length;
list_push_back(&rpc->output, &buf->list_node);
rpc->output_count++;
rpc->backlog += length;
if (rpc->output_count >= 50) {
VLOG_INFO_RL(&rl, "excessive sending backlog, jsonrpc: %s, num of"
" msgs: %"PRIuSIZE", backlog: %"PRIuSIZE".", rpc->name,
rpc->output_count, rpc->backlog);
}
if (rpc->backlog == length) {
jsonrpc_run(rpc);
}
return rpc->status;
}
struct jsonrpc_msg *
jsonrpc_session_recv(struct jsonrpc_session *s)
{
if (s->rpc) {
unsigned int received_bytes;
struct jsonrpc_msg *msg;
received_bytes = jsonrpc_get_received_bytes(s->rpc);
jsonrpc_recv(s->rpc, &msg);
if (received_bytes != jsonrpc_get_received_bytes(s->rpc)) {
/* Data was successfully received.
*
* Previously we only counted receiving a full message as activity,
* but with large messages or a slow connection that policy could
* time out the session mid-message. */
reconnect_activity(s->reconnect, time_msec());
}
if (msg) {
if (msg->type == JSONRPC_REQUEST && !strcmp(msg->method, "echo")) {
/* Echo request. Send reply. */
struct jsonrpc_msg *reply;
reply = jsonrpc_create_reply(json_clone(msg->params), msg->id);
jsonrpc_session_send(s, reply);
} else if (msg->type == JSONRPC_REPLY
&& msg->id && msg->id->type == JSON_STRING
&& !strcmp(msg->id->u.string, "echo")) {
/* It's a reply to our echo request. Suppress it. */
} else {
return msg;
}
jsonrpc_msg_destroy(msg);
}
}
return NULL;
}
static void
do_listen(struct ovs_cmdl_context *ctx)
{
struct pstream *pstream;
struct jsonrpc **rpcs;
size_t n_rpcs, allocated_rpcs;
bool done;
int error;
error = jsonrpc_pstream_open(ctx->argv[1], &pstream, DSCP_DEFAULT);
if (error) {
ovs_fatal(error, "could not listen on \"%s\"", ctx->argv[1]);
}
daemonize();
rpcs = NULL;
n_rpcs = allocated_rpcs = 0;
done = false;
for (;;) {
struct stream *stream;
size_t i;
/* Accept new connections. */
error = pstream_accept(pstream, &stream);
if (!error) {
if (n_rpcs >= allocated_rpcs) {
rpcs = x2nrealloc(rpcs, &allocated_rpcs, sizeof *rpcs);
}
rpcs[n_rpcs++] = jsonrpc_open(stream);
} else if (error != EAGAIN) {
ovs_fatal(error, "pstream_accept failed");
}
/* Service existing connections. */
for (i = 0; i < n_rpcs; ) {
struct jsonrpc *rpc = rpcs[i];
struct jsonrpc_msg *msg;
jsonrpc_run(rpc);
if (!jsonrpc_get_backlog(rpc)) {
error = jsonrpc_recv(rpc, &msg);
if (!error) {
error = handle_rpc(rpc, msg, &done);
jsonrpc_msg_destroy(msg);
} else if (error == EAGAIN) {
error = 0;
}
}
if (!error) {
error = jsonrpc_get_status(rpc);
}
if (error) {
jsonrpc_close(rpc);
ovs_error(error, "connection closed");
memmove(&rpcs[i], &rpcs[i + 1],
(n_rpcs - i - 1) * sizeof *rpcs);
n_rpcs--;
} else {
i++;
}
}
/* Wait for something to do. */
if (done && !n_rpcs) {
break;
}
pstream_wait(pstream);
for (i = 0; i < n_rpcs; i++) {
struct jsonrpc *rpc = rpcs[i];
jsonrpc_wait(rpc);
if (!jsonrpc_get_backlog(rpc)) {
jsonrpc_recv_wait(rpc);
}
}
poll_block();
}
free(rpcs);
pstream_close(pstream);
}