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68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
// Copyright (c) 2022 Cesanta Software Limited
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// All rights reserved
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//
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// UI example
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// It implements the following endpoints:
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// /api/config/get - respond with current config
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// /api/config/set - POST a config change
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// any other URI serves static files from s_root_dir
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// Data and results are JSON strings
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#include "mongoose.h"
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static const char *s_http_addr = "http://localhost:8000"; // HTTP port
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static const char *s_root_dir = "web_root";
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#define MQTT_SERVER "mqtt://broker.hivemq.com:1883"
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#define MQTT_PUBLISH_TOPIC "mg/my_device"
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#define MQTT_SUBSCRIBE_TOPIC "mg/#"
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static struct config {
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char *url, *pub, *sub;
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} s_config;
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// Try to update a single configuration value
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static void update_config(struct mg_str json, const char *path, char **value) {
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char *jval;
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if ((jval = mg_json_get_str(json, path)) != NULL) {
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free(*value);
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*value = strdup(jval);
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}
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}
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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 && c->is_listening) {
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s_config.url = strdup(MQTT_SERVER);
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s_config.pub = strdup(MQTT_PUBLISH_TOPIC);
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s_config.sub = strdup(MQTT_SUBSCRIBE_TOPIC);
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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, "/api/config/get")) {
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mg_http_reply(c, 200, "Content-Type: application/json\r\n",
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"{%m:%m,%m:%m,%m:%m}\n", mg_print_esc, 0, "url",
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mg_print_esc, 0, s_config.url, mg_print_esc, 0, "pub",
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mg_print_esc, 0, s_config.pub, mg_print_esc, 0, "sub",
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mg_print_esc, 0, s_config.sub);
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} else if (mg_http_match_uri(hm, "/api/config/set")) {
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struct mg_str json = hm->body;
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update_config(json, "$.url", &s_config.url);
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update_config(json, "$.pub", &s_config.pub);
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update_config(json, "$.sub", &s_config.sub);
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mg_http_reply(c, 200, "", "ok\n");
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} else {
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struct mg_http_serve_opts opts = {.root_dir = s_root_dir};
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mg_http_serve_dir(c, ev_data, &opts);
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}
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}
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(void) fn_data;
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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_log_set(MG_LL_INFO); // Set to 3 to enable debug
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mg_mgr_init(&mgr); // Initialise event manager
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mg_http_listen(&mgr, s_http_addr, 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);
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return 0;
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}
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