mirror of
https://github.com/cesanta/mongoose.git
synced 2024-12-12 15:39:00 +08:00
85 lines
3.2 KiB
C
85 lines
3.2 KiB
C
// Copyright (c) 2020 Cesanta Software Limited
|
|
// All rights reserved
|
|
//
|
|
// See https://mongoose.ws/tutorials/json-rpc-over-websocket/
|
|
|
|
#include "mongoose.h"
|
|
|
|
static const char *s_listen_on = "ws://localhost:8000";
|
|
static const char *s_web_root = "web_root";
|
|
static struct mg_rpc *s_rpc_head = NULL;
|
|
|
|
static void rpc_sum(struct mg_rpc_req *r) {
|
|
double a = 0.0, b = 0.0;
|
|
mg_json_get_num(r->frame, "$.params[0]", &a);
|
|
mg_json_get_num(r->frame, "$.params[1]", &b);
|
|
mg_rpc_ok(r, "%g", a + b);
|
|
}
|
|
|
|
static void rpc_mul(struct mg_rpc_req *r) {
|
|
double a = 0.0, b = 0.0;
|
|
mg_json_get_num(r->frame, "$.params[0]", &a);
|
|
mg_json_get_num(r->frame, "$.params[1]", &b);
|
|
mg_rpc_ok(r, "%g", a * b);
|
|
}
|
|
|
|
// This RESTful server implements the following endpoints:
|
|
// /websocket - upgrade to Websocket, and implement websocket echo server
|
|
// any other URI serves static files from s_web_root
|
|
static void fn(struct mg_connection *c, int ev, void *ev_data) {
|
|
if (ev == MG_EV_OPEN) {
|
|
// c->is_hexdumping = 1;
|
|
} else if (ev == MG_EV_WS_OPEN) {
|
|
c->data[0] = 'W'; // Mark this connection as an established WS client
|
|
} else if (ev == MG_EV_HTTP_MSG) {
|
|
struct mg_http_message *hm = (struct mg_http_message *) ev_data;
|
|
if (mg_http_match_uri(hm, "/websocket")) {
|
|
// Upgrade to websocket. From now on, a connection is a full-duplex
|
|
// Websocket connection, which will receive MG_EV_WS_MSG events.
|
|
mg_ws_upgrade(c, hm, NULL);
|
|
} else {
|
|
// Serve static files
|
|
struct mg_http_serve_opts opts = {.root_dir = s_web_root};
|
|
mg_http_serve_dir(c, ev_data, &opts);
|
|
}
|
|
} else if (ev == MG_EV_WS_MSG) {
|
|
// Got websocket frame. Received data is wm->data
|
|
struct mg_ws_message *wm = (struct mg_ws_message *) ev_data;
|
|
struct mg_iobuf io = {0, 0, 0, 512};
|
|
struct mg_rpc_req r = {&s_rpc_head, 0, mg_pfn_iobuf, &io, 0, wm->data};
|
|
mg_rpc_process(&r);
|
|
if (io.buf) mg_ws_send(c, (char *) io.buf, io.len, WEBSOCKET_OP_TEXT);
|
|
mg_iobuf_free(&io);
|
|
}
|
|
}
|
|
|
|
static void timer_fn(void *arg) {
|
|
struct mg_mgr *mgr = (struct mg_mgr *) arg;
|
|
// Broadcast message to all connected websocket clients.
|
|
for (struct mg_connection *c = mgr->conns; c != NULL; c = c->next) {
|
|
if (c->data[0] != 'W') continue;
|
|
mg_ws_printf(c, WEBSOCKET_OP_TEXT, "{%m:%m,%m:[%d,%d,%d]}",
|
|
MG_ESC("method"), MG_ESC("notification1"), MG_ESC("params"), 1,
|
|
2, 3);
|
|
}
|
|
}
|
|
|
|
int main(void) {
|
|
struct mg_mgr mgr; // Event manager
|
|
mg_mgr_init(&mgr); // Init event manager
|
|
mg_log_set(MG_LL_DEBUG); // Set log level
|
|
mg_timer_add(&mgr, 5000, MG_TIMER_REPEAT, timer_fn, &mgr); // Init timer
|
|
|
|
// Configure JSON-RPC functions we're going to handle
|
|
mg_rpc_add(&s_rpc_head, mg_str("sum"), rpc_sum, NULL);
|
|
mg_rpc_add(&s_rpc_head, mg_str("mul"), rpc_mul, NULL);
|
|
mg_rpc_add(&s_rpc_head, mg_str("rpc.list"), mg_rpc_list, &s_rpc_head);
|
|
|
|
printf("Starting WS listener on %s/websocket\n", s_listen_on);
|
|
mg_http_listen(&mgr, s_listen_on, fn, NULL); // Create HTTP listener
|
|
for (;;) mg_mgr_poll(&mgr, 1000); // Infinite event loop
|
|
mg_mgr_free(&mgr); // Deallocate event manager
|
|
mg_rpc_del(&s_rpc_head, NULL); // Deallocate RPC handlers
|
|
return 0;
|
|
}
|