106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
#include "wsserver.h"
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/*
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* This section provides a web server to controll the
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* device manager through web sockets
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*
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* by Dennis Gunia - 2025 - www.dennisgunia.de
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*/
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json_object *(*commandparser_func)(json_object *);
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// this sections handles ws connections and communications
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// called on opening websocket client
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void onopen(ws_cli_conn_t client)
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{
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char *cli;
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cli = ws_getaddress(client);
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printf("Connection opened, addr: %s\n", cli);
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}
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// called on closing websocket client
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void onclose(ws_cli_conn_t client)
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{
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char *cli;
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cli = ws_getaddress(client);
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printf("Connection closed, addr: %s\n", cli);
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}
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// called on receiving websocket message
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void onmessage(ws_cli_conn_t client, const unsigned char *msg, uint64_t size, int type)
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{
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char *cli = ws_getaddress(client);
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printf("received message: %s (%zu), from: %s\n", msg, size, cli);
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json_tokener *tok = json_tokener_new();
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json_object *req = json_tokener_parse_ex(tok, msg, size);
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enum json_tokener_error jerr;
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jerr = json_tokener_get_error(tok);
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if (jerr != json_tokener_success)
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{
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// check if request can be parsed, if not retrun error
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send_json_error(client, "parsing error", json_tokener_error_desc(jerr));
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}
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else
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{
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// if it can be parsed, get command.
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json_object *commandObj = json_object_object_get(req, "command");
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printf("test");
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if (commandObj != NULL)
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{
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char *command = json_object_to_json_string(commandObj);
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// get key
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json_object *res = commandparser_func(req);
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if (res == NULL)
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{
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send_json_error(client, "internal error", "");
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}
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else
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{
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send_json_response(client, res);
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}
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free(res);
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}
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else
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{
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// if key is missing, send error
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send_json_error(client, "format error", "missing key: command");
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}
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}
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free(tok); // always free tokenizer, to prevent memory leak
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}
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void send_json_response(ws_cli_conn_t client, json_object *res)
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{
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char *message = json_object_to_json_string_ext(res, JSON_C_TO_STRING_PRETTY);
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ws_sendframe_txt(client, message);
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}
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void send_json_error(ws_cli_conn_t client, char *error, char *detail)
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{
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json_object *root = json_object_new_object();
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json_object_object_add(root, "error", json_object_new_string(error));
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json_object_object_add(root, "detail", json_object_new_string(detail));
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send_json_response(client, root);
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}
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// starting webserver
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int start_webserver(json_object *(*commandparser_func_ptr)(json_object *))
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{
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commandparser_func = commandparser_func_ptr;
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ws_socket(&(struct ws_server){/*
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* Bind host, such as:
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* localhost -> localhost/127.0.0.1
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* 0.0.0.0 -> global IPv4
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* :: -> global IPv4+IPv6 (Dual stack)
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*/
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.host = WS_SERVER_ADDR,
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.port = WS_SERVER_PORT,
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.thread_loop = 0,
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.timeout_ms = 1000,
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.evs.onopen = &onopen,
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.evs.onclose = &onclose,
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.evs.onmessage = &onmessage});
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return (0);
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} |