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Router: fixing error handling in config request.

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The controller process awaits the response from the router for every
configration change request.  This patch adds error reporting for various error
conditions which may happen because of file descriptors or memory shortage.

Lack of a response lead to the controller awaiting the response, thus being
unable to process other client reconfiguration requests that also became stuck.
This commit is contained in:
Max Romanov
2021-01-27 17:32:03 +03:00
parent e4f7d1a29c
commit 3855f1c032
1 changed files with 43 additions and 20 deletions
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61
src/nxt_router.c
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@@ -699,26 +699,39 @@ nxt_router_conf_data_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg)
void *p;
size_t size;
nxt_int_t ret;
nxt_port_t *port;
nxt_router_temp_conf_t *tmcf;
tmcf = nxt_router_temp_conf(task);
if (nxt_slow_path(tmcf == NULL)) {
port = nxt_runtime_port_find(task->thread->runtime,
msg->port_msg.pid,
msg->port_msg.reply_port);
if (nxt_slow_path(port == NULL)) {
nxt_alert(task, "conf_data_handler: reply port not found");
return;
}
p = MAP_FAILED;
/*
* Ancient compilers like gcc 4.8.5 on CentOS 7 wants 'size' to be
* initialized in 'cleanup' section.
*/
size = 0;
tmcf = nxt_router_temp_conf(task);
if (nxt_slow_path(tmcf == NULL)) {
goto fail;
}
if (nxt_slow_path(msg->fd[0] == -1)) {
nxt_alert(task, "conf_data_handler: invalid file shm fd");
return;
nxt_alert(task, "conf_data_handler: invalid shm fd");
goto fail;
}
if (nxt_buf_mem_used_size(&msg->buf->mem) != sizeof(size_t)) {
nxt_alert(task, "conf_data_handler: unexpected buffer size (%d)",
(int) nxt_buf_mem_used_size(&msg->buf->mem));
nxt_fd_close(msg->fd[0]);
msg->fd[0] = -1;
return;
goto fail;
}
nxt_memcpy(&size, msg->buf->mem.pos, sizeof(size_t));
@@ -729,22 +742,14 @@ nxt_router_conf_data_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg)
msg->fd[0] = -1;
if (nxt_slow_path(p == MAP_FAILED)) {
return;
goto fail;
}
nxt_debug(task, "conf_data_handler(%uz): %*s", size, size, p);
tmcf->router_conf->router = nxt_router;
tmcf->stream = msg->port_msg.stream;
tmcf->port = nxt_runtime_port_find(task->thread->runtime,
msg->port_msg.pid,
msg->port_msg.reply_port);
if (nxt_slow_path(tmcf->port == NULL)) {
nxt_alert(task, "reply port not found");
goto fail;
}
tmcf->port = port;
nxt_port_use(task, tmcf->port, 1);
@@ -757,11 +762,29 @@ nxt_router_conf_data_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg)
nxt_router_conf_error(task, tmcf);
}
goto cleanup;
fail:
nxt_port_socket_write(task, port, NXT_PORT_MSG_RPC_ERROR, -1,
msg->port_msg.stream, 0, NULL);
if (tmcf != NULL) {
nxt_mp_destroy(tmcf->mem_pool);
}
cleanup:
if (p != MAP_FAILED) {
nxt_mem_munmap(p, size);
}
if (msg->fd[0] != -1) {
nxt_fd_close(msg->fd[0]);
msg->fd[0] = -1;
}
}
static void
nxt_router_app_process_remove_pid(nxt_task_t *task, nxt_port_t *port,