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100 lines
4.2 KiB
Markdown
100 lines
4.2 KiB
Markdown
# Mongoose Embedding Guide
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Embedding Mongoose is done in two steps:
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1. Copy
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[mongoose.c](https://raw.github.com/cesanta/mongoose/master/mongoose.c) and
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[mongoose.h](https://raw.github.com/cesanta/mongoose/master/mongoose.h)
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to your application's source tree and include these two files in the build.
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2. Somewhere in the application code, call `mg_create_server()` to create
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a server, configure it with `mg_set_option()` and loop with
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`mg_poll_server()` until done. Call `mg_destroy_server()` to cleanup.
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Here's a minimal application `app.c` that embeds mongoose:
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#include "mongoose.h"
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int main(void) {
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struct mg_server *server = mg_create_server(NULL);
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mg_set_option(server, "document_root", ".");
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mg_set_option(server, "listening_port", "8080");
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for (;;) mg_poll_server(server, 1000); // Infinite loop, Ctrl-C to stop
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mg_destroy_server(&server);
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return 0;
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}
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To compile it, put `mongoose.c`, `mongoose.h` and `minimal.c` into one
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folder, then run the following UNIX command:
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cc app.c mongoose.c -o app
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If you're on Windows, run this in a Visual Studio shell:
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cl app.c mongoose.c /TC /MD
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When run, this simple application opens port 8080 and serves static files,
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CGI files and lists directory content in the current working directory.
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Mongoose can call user-defined functions when certain URIs are requested.
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These functions are _called uri handlers_. `mg_add_uri_handler()` registers
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an URI handler, and there is no restriction exist on the number of URI handlers.
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Also, mongoose can call a user-defined function when it is about to send
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HTTP error back to client. That function is called _http error handler_ and
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can be registered by `mg_set_http_error_handler()`. Handlers are called
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by Mongoose with `struct mg_connection *` pointer as a parameter, which
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has all information about the request: HTTP headers, POST or websocket
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data buffer, etcetera.
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Let's extend our minimal application example and
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create an URI that will be served by user's C code. The app will handle
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`/hello` URI by showing a hello message. So, when app is run,
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http://127.0.0.1:8080/hello will say hello, and here's the code:
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#include <string.h>
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#include "mongoose.h"
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static int handle_hello(struct mg_connection *conn) {
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static const char *reply = "HTTP/1.0 200 OK\r\n\r\nHello world!\n";
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mg_write(conn, reply, strlen(reply));
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return 1;
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}
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int main(void) {
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struct mg_server *server = mg_create_server(NULL);
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mg_set_option(server, "document_root", ".");
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mg_set_option(server, "listening_port", "8080");
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mg_add_uri_handler(server, "/hello", &handle_hello);
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for (;;) mg_poll_server(server, 1000); // Infinite loop, Ctrl-C to stop
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mg_destroy_server(&server);
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return 0;
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}
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Note that URI handler must output valid HTTP response, which includes
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the reply line with status code `HTTP/1.0 200 OK`, HTTP headers which are
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empty in our example, and message body `Hello world!\n`. Note that reply
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line is ended with `\r\n`, and HTTP headers are also ended with `\r\n`.
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Below is the list of compilation flags that enable or disable certain
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features. By default, some features are enabled, and could be disabled
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by setting appropriate `NO_*` flag. Features that are disabled by default
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could be enabled by setting appropriate `USE_*` flag. Bare bones Mongoose
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is quite small, about 30 kilobytes of compiled x86 code. Each feature adds
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a couple of kilobytes to the executable size, and also has some runtime penalty.
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-DNO_AUTH Disable MD5 authorization support
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-DNO_CGI Disable CGI support
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-DNO_DAV Disable WebDAV support (PUT, DELETE, MKCOL, PROPFIND)
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-DNO_DIRECTORY_LISTING Disable directory listing
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-DNO_LOGGING Disable access/error logging
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-DNO_WEBSOCKET Disable WebSocket support
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-DUSE_IPV6 Enable IPv6 support
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-DUSE_LUA Enable Lua scripting
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-DUSE_LUA_SQLITE3 Enable sqlite3 binding for Lua
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-DUSE_SSL Enable SSL
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Mongoose source code contains a well-commented example code, listed below:
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* [hello.c](https://github.com/cesanta/mongoose/blob/master/examples/hello.c)
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shows how to handle form input, file upload, websocket communication, get
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cookie values.
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