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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 "mjson.h"
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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 void sum(struct jsonrpc_request *r) {
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double a = 0.0, b = 0.0;
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mjson_get_number(r->params, r->params_len, "$[0]", &a);
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mjson_get_number(r->params, r->params_len, "$[1]", &b);
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jsonrpc_return_success(r, "%g", a + b);
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}
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static void multiply(struct jsonrpc_request *r) {
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double a = 0.0, b = 0.0;
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mjson_get_number(r->params, r->params_len, "$[0]", &a);
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mjson_get_number(r->params, r->params_len, "$[1]", &b);
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jsonrpc_return_success(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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struct mg_str req = wm->data;
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char *response = NULL;
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jsonrpc_process(req.ptr, req.len, mjson_print_dynamic_buf, &response, NULL);
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mg_ws_send(c, response, strlen(response), WEBSOCKET_OP_TEXT);
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LOG(LL_INFO, ("[%.*s] -> [%s]", (int) req.len, req.ptr, response));
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free(response);
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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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// Broadcast "hi" message to all connected websocket clients.
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// Traverse over all connections
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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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const char *msg = "{\"method\":\"hiya!!\",\"params\":[1,2,3]}";
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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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}
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int main(void) {
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struct mg_mgr mgr; // Event manager
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struct mg_timer t1; // Timer
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mg_mgr_init(&mgr); // Init event manager
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mg_timer_init(&t1, 5000, MG_TIMER_REPEAT, timer_fn, &mgr); // Init timer
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jsonrpc_init(NULL, NULL); // Init JSON-RPC instance
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jsonrpc_export("sum", sum); // And export a couple
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jsonrpc_export("mul", multiply); // of RPC functions
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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_timer_free(&t1); // Free timer resources
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mg_mgr_free(&mgr); // Deallocate event manager
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return 0;
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}
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