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jsonrpc_io.c
558 lines (471 loc) · 14 KB
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jsonrpc_io.c
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/*
*
* Copyright (C) 2011 Flowroute LLC (flowroute.com)
*
* This file is part of Kamailio, a free SIP server.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
*
* This file is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <event.h>
#include <sys/timerfd.h>
#include "../../sr_module.h"
#include "../../route.h"
#include "../../route_struct.h"
#include "../../lvalue.h"
#include "../tm/tm_load.h"
#include "jsonrpc_io.h"
#include "jsonrpc.h"
#include "netstring.h"
#define CHECK_MALLOC_VOID(p) if(!p) {LM_ERR("Out of memory!"); return;}
#define CHECK_MALLOC(p) if(!p) {LM_ERR("Out of memory!"); return -1;}
struct jsonrpc_server {
char *host;
int port, socket, status;
struct jsonrpc_server *next;
struct event *ev;
struct itimerspec *timer;
};
struct jsonrpc_server_group {
struct jsonrpc_server *next_server;
int priority;
struct jsonrpc_server_group *next_group;
};
struct tm_binds tmb;
struct jsonrpc_server_group *server_group;
void socket_cb(int fd, short event, void *arg);
void cmd_pipe_cb(int fd, short event, void *arg);
int set_non_blocking(int fd);
int parse_servers(char *_servers, struct jsonrpc_server_group **group_ptr);
int connect_servers(struct jsonrpc_server_group *group);
int connect_server(struct jsonrpc_server *server);
int handle_server_failure(struct jsonrpc_server *server);
int jsonrpc_io_child_process(int cmd_pipe, char* _servers)
{
if (parse_servers(_servers, &server_group) != 0)
{
LM_ERR("servers parameter could not be parsed\n");
return -1;
}
event_init();
struct event pipe_ev;
set_non_blocking(cmd_pipe);
event_set(&pipe_ev, cmd_pipe, EV_READ | EV_PERSIST, cmd_pipe_cb, &pipe_ev);
event_add(&pipe_ev, NULL);
if (!connect_servers(server_group))
{
LM_ERR("failed to connect to any servers\n");
return -1;
}
event_dispatch();
return 0;
}
void timeout_cb(int fd, short event, void *arg)
{
LM_ERR("message timeout\n");
jsonrpc_request_t *req = (jsonrpc_request_t*)arg;
json_object *error = json_object_new_string("timeout");
void_jsonrpc_request(req->id);
close(req->timerfd);
event_del(req->timer_ev);
pkg_free(req->timer_ev);
req->cbfunc(error, req->cbdata, 1);
pkg_free(req);
}
int result_cb(json_object *result, char *data, int error)
{
struct jsonrpc_pipe_cmd *cmd = (struct jsonrpc_pipe_cmd*)data;
pv_spec_t *dst = cmd->cb_pv;
pv_value_t val;
const char* res = json_object_get_string(result);
val.rs.s = (char*)res;
val.rs.len = strlen(res);
val.flags = PV_VAL_STR;
dst->setf(0, &dst->pvp, (int)EQ_T, &val);
int n;
if (error) {
n = route_get(&main_rt, cmd->err_route);
} else {
n = route_get(&main_rt, cmd->cb_route);
}
struct action *a = main_rt.rlist[n];
tmb.t_continue(cmd->t_hash, cmd->t_label, a);
free_pipe_cmd(cmd);
return 0;
}
int (*res_cb)(json_object*, char*, int) = &result_cb;
void cmd_pipe_cb(int fd, short event, void *arg)
{
struct jsonrpc_pipe_cmd *cmd;
/* struct event *ev = (struct event*)arg; */
if (read(fd, &cmd, sizeof(cmd)) != sizeof(cmd)) {
LM_ERR("failed to read from command pipe: %s\n", strerror(errno));
return;
}
json_object *params = json_tokener_parse(cmd->params);
json_object *payload = NULL;
jsonrpc_request_t *req = NULL;
if (cmd->notify_only) {
payload = build_jsonrpc_notification(cmd->method, params);
} else {
req = build_jsonrpc_request(cmd->method, params, (char*)cmd, res_cb);
if (req)
payload = req->payload;
}
if (!payload) {
LM_ERR("Failed to build jsonrpc_request_t (method: %s, params: %s)\n", cmd->method, cmd->params);
return;
}
char *json = (char*)json_object_get_string(payload);
char *ns; size_t bytes;
bytes = netstring_encode_new(&ns, json, (size_t)strlen(json));
struct jsonrpc_server_group *g;
int sent = 0;
for (g = server_group; g != NULL; g = g->next_group)
{
struct jsonrpc_server *s, *first = NULL;
for (s = g->next_server; s != first; s = s->next)
{
if (first == NULL) first = s;
if (s->status == JSONRPC_SERVER_CONNECTED) {
if (send(s->socket, ns, bytes, 0) == bytes)
{
sent = 1;
break;
} else {
handle_server_failure(s);
}
}
g->next_server = s->next;
}
if (sent) {
break;
} else {
LM_WARN("Failed to send on priority group %d... proceeding to next priority group.\n", g->priority);
}
}
if (sent && req) {
int timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
if (timerfd == -1) {
LM_ERR("Could not create timerfd.");
return;
}
req->timerfd = timerfd;
struct itimerspec *itime = pkg_malloc(sizeof(struct itimerspec));
CHECK_MALLOC_VOID(itime);
itime->it_interval.tv_sec = 0;
itime->it_interval.tv_nsec = 0;
itime->it_value.tv_sec = JSONRPC_TIMEOUT/1000;
itime->it_value.tv_nsec = (JSONRPC_TIMEOUT % 1000) * 1000000;
if (timerfd_settime(timerfd, 0, itime, NULL) == -1)
{
LM_ERR("Could not set timer.");
return;
}
pkg_free(itime);
struct event *timer_ev = pkg_malloc(sizeof(struct event));
CHECK_MALLOC_VOID(timer_ev);
event_set(timer_ev, timerfd, EV_READ, timeout_cb, req);
if(event_add(timer_ev, NULL) == -1) {
LM_ERR("event_add failed while setting request timer (%s).", strerror(errno));
return;
}
req->timer_ev = timer_ev;
} else if (!sent) {
LM_ERR("Request could not be sent... no more failover groups.\n");
if (req) {
json_object *error = json_object_new_string("failure");
void_jsonrpc_request(req->id);
req->cbfunc(error, req->cbdata, 1);
}
}
pkg_free(ns);
json_object_put(payload);
}
void socket_cb(int fd, short event, void *arg)
{
struct jsonrpc_server *server = (struct jsonrpc_server*)arg;
if (event != EV_READ) {
LM_ERR("unexpected socket event (%d)\n", event);
handle_server_failure(server);
return;
}
char *netstring;
int retval = netstring_read_fd(fd, &netstring);
if (retval != 0) {
LM_ERR("bad netstring (%d)\n", retval);
handle_server_failure(server);
return;
}
struct json_object *res = json_tokener_parse(netstring);
if (res) {
handle_jsonrpc_response(res);
json_object_put(res);
} else {
LM_ERR("netstring could not be parsed: (%s)\n", netstring);
handle_server_failure(server);
}
pkg_free(netstring);
}
int set_non_blocking(int fd)
{
int flags;
flags = fcntl(fd, F_GETFL);
if (flags < 0)
return flags;
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0)
return -1;
return 0;
}
int parse_servers(char *_servers, struct jsonrpc_server_group **group_ptr)
{
char cpy[strlen(_servers)+1];
char *servers = strcpy(cpy, _servers);
struct jsonrpc_server_group *group = NULL;
/* parse servers string */
char *token = strtok(servers, ":");
while (token != NULL)
{
char *host, *port_s, *priority_s, *tail;
int port, priority;
host = token;
/* validate domain */
if (!(isalpha(host[0]) || isdigit(host[0]))) {
LM_ERR("invalid domain (1st char is '%c')\n", host[0]);
return -1;
}
int i;
for (i=1; i<strlen(host)-1; i++)
{
if(!(isalpha(host[i]) || isdigit(host[i]) || host[i] == '-' || host[i] == '.'))
{
LM_ERR("invalid domain (char %d is %c)\n", i, host[i]);
return -1;
}
}
if (!(isalpha(host[i]) || isdigit(host[i]))) {
LM_ERR("invalid domain (char %d (last) is %c)\n", i, host[i]);
return -1;
}
/* convert/validate port */
port_s = strtok(NULL, ",");
if (port_s == NULL || !(port = strtol(port_s, &tail, 0)) || strlen(tail))
{
LM_ERR("invalid port: %s\n", port_s);
return -1;
}
/* convert/validate priority */
priority_s = strtok(NULL, " ");
if (priority_s == NULL || !(priority = strtol(priority_s, &tail, 0)) || strlen(tail))
{
LM_ERR("invalid priority: %s\n", priority_s);
return -1;
}
struct jsonrpc_server *server = pkg_malloc(sizeof(struct jsonrpc_server));
CHECK_MALLOC(server);
memset(server, 0, sizeof(struct jsonrpc_server));
char *h = pkg_malloc(strlen(host)+1);
CHECK_MALLOC(h);
strcpy(h,host);
server->host = h;
server->port = port;
server->status = JSONRPC_SERVER_DISCONNECTED;
server->socket = 0;
int group_cnt = 0;
/* search for a server group with this server's priority */
struct jsonrpc_server_group *selected_group = NULL;
for (selected_group=group; selected_group != NULL; selected_group=selected_group->next_group)
{
if (selected_group->priority == priority) break;
}
if (selected_group == NULL) {
group_cnt++;
LM_INFO("Creating group for priority %d\n", priority);
/* this is the first server for this priority... link it to itself */
server->next = server;
selected_group = pkg_malloc(sizeof(struct jsonrpc_server_group));
CHECK_MALLOC(selected_group);
memset(selected_group, 0, sizeof(struct jsonrpc_server_group));
selected_group->priority = priority;
selected_group->next_server = server;
/* insert the group properly in the linked list */
struct jsonrpc_server_group *x, *pg;
pg = NULL;
if (group == NULL)
{
group = selected_group;
group->next_group = NULL;
} else {
for (x = group; x != NULL; x = x->next_group)
{
if (priority > x->priority)
{
if (pg == NULL)
{
group = selected_group;
} else {
pg->next_group = selected_group;
}
selected_group->next_group = x;
break;
} else if (x->next_group == NULL) {
x->next_group = selected_group;
break;
} else {
pg = x;
}
}
}
} else {
LM_ERR("Using existing group for priority %d\n", priority);
server->next = selected_group->next_server->next;
selected_group->next_server->next = server;
}
token = strtok(NULL, ":");
}
*group_ptr = group;
return 0;
}
int connect_server(struct jsonrpc_server *server)
{
struct sockaddr_in server_addr;
struct hostent *hp;
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(server->port);
hp = gethostbyname(server->host);
if (hp == NULL) {
LM_ERR("gethostbyname(%s) failed with h_errno=%d.\n", server->host, h_errno);
handle_server_failure(server);
return -1;
}
memcpy(&(server_addr.sin_addr.s_addr), hp->h_addr, hp->h_length);
int sockfd = socket(AF_INET,SOCK_STREAM,0);
if (connect(sockfd, (struct sockaddr *)&server_addr, sizeof(struct sockaddr_in))) {
LM_WARN("Failed to connect to %s on port %d... %s\n", server->host, server->port, strerror(errno));
handle_server_failure(server);
return -1;
}
if (set_non_blocking(sockfd) != 0)
{
LM_WARN("Failed to set socket (%s:%d) to non blocking.\n", server->host, server->port);
handle_server_failure(server);
return -1;
}
server->socket = sockfd;
server->status = JSONRPC_SERVER_CONNECTED;
struct event *socket_ev = pkg_malloc(sizeof(struct event));
CHECK_MALLOC(socket_ev);
event_set(socket_ev, sockfd, EV_READ | EV_PERSIST, socket_cb, server);
event_add(socket_ev, NULL);
server->ev = socket_ev;
return 0;
}
int connect_servers(struct jsonrpc_server_group *group)
{
int connected_servers = 0;
for (;group != NULL; group = group->next_group)
{
struct jsonrpc_server *s, *first = NULL;
LM_INFO("Connecting to servers for priority %d:\n", group->priority);
for (s=group->next_server;s!=first;s=s->next)
{
if (connect_server(s) == 0)
{
connected_servers++;
LM_INFO("Connected to host %s on port %d\n", s->host, s->port);
}
if (first == NULL) first = s;
}
}
return connected_servers;
}
void reconnect_cb(int fd, short event, void *arg)
{
LM_INFO("Attempting to reconnect now.");
struct jsonrpc_server *server = (struct jsonrpc_server*)arg;
if (server->status == JSONRPC_SERVER_CONNECTED) {
LM_WARN("Trying to connect an already connected server.");
return;
}
if (server->ev != NULL) {
event_del(server->ev);
pkg_free(server->ev);
server->ev = NULL;
}
close(fd);
pkg_free(server->timer);
connect_server(server);
}
int handle_server_failure(struct jsonrpc_server *server)
{
LM_INFO("Setting timer to reconnect to %s on port %d in %d seconds.\n", server->host, server->port, JSONRPC_RECONNECT_INTERVAL);
if (server->socket)
close(server->socket);
server->socket = 0;
if (server->ev != NULL) {
event_del(server->ev);
pkg_free(server->ev);
server->ev = NULL;
}
server->status = JSONRPC_SERVER_FAILURE;
int timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
if (timerfd == -1) {
LM_ERR("Could not create timerfd to reschedule connection. No further attempts will be made to reconnect this server.");
return -1;
}
struct itimerspec *itime = pkg_malloc(sizeof(struct itimerspec));
CHECK_MALLOC(itime);
itime->it_interval.tv_sec = 0;
itime->it_interval.tv_nsec = 0;
itime->it_value.tv_sec = JSONRPC_RECONNECT_INTERVAL;
itime->it_value.tv_nsec = 0;
if (timerfd_settime(timerfd, 0, itime, NULL) == -1)
{
LM_ERR("Could not set timer to reschedule connection. No further attempts will be made to reconnect this server.");
return -1;
}
LM_INFO("timerfd value is %d\n", timerfd);
struct event *timer_ev = pkg_malloc(sizeof(struct event));
CHECK_MALLOC(timer_ev);
event_set(timer_ev, timerfd, EV_READ, reconnect_cb, server);
if(event_add(timer_ev, NULL) == -1) {
LM_ERR("event_add failed while rescheduling connection (%s). No further attempts will be made to reconnect this server.", strerror(errno));
return -1;
}
server->ev = timer_ev;
server->timer = itime;
return 0;
}
void free_pipe_cmd(struct jsonrpc_pipe_cmd *cmd)
{
if (cmd->method)
shm_free(cmd->method);
if (cmd->params)
shm_free(cmd->params);
if (cmd->cb_route)
shm_free(cmd->cb_route);
if (cmd->err_route)
shm_free(cmd->err_route);
if (cmd->cb_pv)
shm_free(cmd->cb_pv);
shm_free(cmd);
}