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uNetworkingABuNetworkingAB
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Add barebone HTTP server example
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2 files changed

+114
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‎Makefile

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default:
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gcc -O3 -o echo_server -s -Isrc src/*.c src/eventing/*.c examples/echo_server.c -lssl -lcrypto
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gcc -DLIBUS_NO_SSL -O3 -o echo_server -s -Isrc src/*.c src/eventing/*.c examples/echo_server.c
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gcc -DLIBUS_NO_SSL -O3 -o http_server -s -Isrc src/*.c src/eventing/*.c examples/http_server.c

‎examples/http_server.c

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/* This is a barebone keep-alive HTTP server */
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#include <libusockets.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct http_socket {
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/* How far we have streamed our response */
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int offset;
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};
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struct http_context {
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/* The shared response */
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char *response;
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int length;
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};
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/* We don't need any of these */
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void on_wakeup(struct us_loop *loop) {
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}
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void on_pre(struct us_loop *loop) {
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}
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/* This is not HTTP POST, it is merely an event emitted post loop iteration */
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void on_post(struct us_loop *loop) {
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}
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void on_http_socket_writable(struct us_socket *s) {
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struct http_socket *http_socket = (struct http_socket *) us_socket_ext(s);
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struct http_context *http_context = (struct http_context *) us_socket_context_ext(us_socket_get_context(s));
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/* Stream whatever is remaining of the response */
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http_socket->offset += us_socket_write(s, http_context->response + http_socket->offset, http_context->length - http_socket->offset, 0);
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}
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void on_http_socket_close(struct us_socket *s) {
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printf("Client disconnected\n");
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}
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void on_http_socket_end(struct us_socket *s) {
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/* HTTP does not support half-closed sockets */
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us_socket_shutdown(s);
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us_socket_close(s);
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}
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void on_http_socket_data(struct us_socket *s, char *data, int length) {
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/* Get socket extension and the socket's context's extension */
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struct http_socket *http_socket = (struct http_socket *) us_socket_ext(s);
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struct http_context *http_context = (struct http_context *) us_socket_context_ext(us_socket_get_context(s));
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/* We treat all data events as a request */
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http_socket->offset = us_socket_write(s, http_context->response, http_context->length, 0);
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/* Reset idle timer */
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us_socket_timeout(s, 30);
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}
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void on_http_socket_open(struct us_socket *s) {
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struct http_socket *http_socket = (struct http_socket *) us_socket_ext(s);
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/* Reset offset */
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http_socket->offset = 0;
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/* Timeout idle HTTP connections */
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us_socket_timeout(s, 30);
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printf("Client connected\n");
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}
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void on_http_socket_timeout(struct us_socket *s) {
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/* Close idle HTTP sockets */
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us_socket_close(s);
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}
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int main() {
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/* Create the event loop */
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struct us_loop *loop = us_create_loop(1, on_wakeup, on_pre, on_post, 0);
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/* Create a socket context for HTTP */
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struct us_socket_context *http_context = us_create_socket_context(loop, sizeof(struct http_context));
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/* Generate the shared response */
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const char body[] = "<html><body><h1>Why hello there!</h1></body></html>";
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struct http_context *http_context_ext = (struct http_context *) us_socket_context_ext(http_context);
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http_context_ext->response = (char *) malloc(128 + sizeof(body) - 1);
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http_context_ext->length = snprintf(http_context_ext->response, 128 + sizeof(body) - 1, "HTTP/1.1 200 OK\r\nContent-Length: %d\r\n\r\n%s", sizeof(body) - 1, body);
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/* Set up event handlers */
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us_socket_context_on_open(http_context, on_http_socket_open);
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us_socket_context_on_data(http_context, on_http_socket_data);
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us_socket_context_on_writable(http_context, on_http_socket_writable);
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us_socket_context_on_close(http_context, on_http_socket_close);
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us_socket_context_on_timeout(http_context, on_http_socket_timeout);
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us_socket_context_on_end(http_context, on_http_socket_end);
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/* Start serving HTTP connections */
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struct us_listen_socket *listen_socket = us_socket_context_listen(http_context, 0, 3000, 0, sizeof(struct http_socket));
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if (listen_socket) {
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printf("Listening on port 3000...\n");
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us_loop_run(loop);
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} else {
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printf("Failed to listen!\n");
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}
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}

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