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