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http_server.c
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http_server.c
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/*
* Copyright Ryati, Inc. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "http_server.h"
#include <uv.h>
#include <http_parser.h>
#include <pcre.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
struct http_reqest_handler_def_s {
pcre *pattern;
http_request_handler_func handler;
http_reqest_handler_def_t *next;
};
struct http_server_s {
uv_loop_t* uv_loop;
uv_tcp_t tcp;
http_parser_settings parser_settings;
uint32_t request_num;
http_reqest_handler_def_t *handlers;
};
struct http_client_s {
http_server_t *server;
uv_tcp_t handle;
// HTTP Parser...
http_parser parser;
http_request_t *request;
int close_connection;
};
uv_write_t write_req;
typedef struct http_write_cb_s http_write_cb_t;
struct http_write_cb_s {
// Callback info to free buffers
http_write_cb cb;
void *data;
};
struct http_request_s {
// HTTP Client - could service multiple requests...
http_client_t *client;
// Current Requestion number
uint32_t request_num;
// Used during parsing to determine what header
// we are getting a value for
uint8_t current_header;
// Handler function to call based on the url/handler_def->pattern
http_request_handler_func handler;
// Args extracted using handler_def pattern
const char **pattern_args;
// Used for Range Requests
uint32_t range_start;
uint32_t range_end;
};
#define CHECK(r, loop, msg) \
if (r) { \
uv_err_t err = uv_last_error(loop); \
fprintf(stderr, "%s: %s\n", msg, uv_strerror(err)); \
}
#define UVERR(err, msg) fprintf(stderr, "%s: %s\n", msg, uv_strerror(err))
#define LOG(msg) puts(msg);
#define LOGF(fmt, params...) printf(fmt "\n", params);
#define LOG_ERROR(msg) puts(msg);
#define RESPONSE_HEADER_SIZE 1024
// HTTP Parser Funcs
int _http_parser__on_message_begin(http_parser*);
int _http_parser__on_url(http_parser*, const char *at, size_t length);
int _http_parser__on_header_field(http_parser*, const char *at, size_t length);
int _http_parser__on_header_value(http_parser*, const char *at, size_t length);
int _http_parser__on_headers_complete(http_parser*);
int _http_parser__on_body(http_parser*, const char *at, size_t length);
int _http_parser__on_message_complete(http_parser*);
// HTTP Server Funcs
static void _http_uv__on_close__cb(uv_handle_t* handle);
static void _http_uv__on_read__cb(uv_stream_t* tcp, ssize_t nread, uv_buf_t buf);
static void _http_uv__on_connect__cb(uv_stream_t* server_handle, int status);
// Request Functions
static http_request_t *_http_request__init(http_client_t *client);
static void _http_request__finish(http_request_t *req);
static http_client_t *_http_client__init(uv_stream_t* server_handle);
static void _http_client__finish(http_client_t *req);
// Client Functions
/*****************************************************************************
* HTTP Callback Parser Functions
****************************************************************************/
int _http_parser__on_message_begin(http_parser* parser) {
// Get Client from parser
http_client_t* client = (http_client_t*) parser->data;
// Create a request
client->request = _http_request__init(client);
LOGF("[ %5d ] _http_parser__on_message_begin", client->request->request_num);
return 0;
}
int _http_parser__on_url(http_parser* parser, const char *at, size_t length) {
http_request_t* req = ((http_client_t*)parser->data)->request;
http_server_t* server = req->client->server;
LOGF("[ %5d ] _http_parser__on_url %s", req->request_num, at);
// Parse URL and determine the handler
int rc;
int ovector[30];
http_reqest_handler_def_t *hdef = server->handlers;
while (hdef != NULL) {
int count = pcre_exec(
hdef->pattern, /* result of pcre_compile() */
NULL, /* we didn't study the pattern */
at, /* the subject string */
length, /* the length of the subject string */
0, /* start at offset 0 in the subject */
0, /* default options */
ovector, /* vector of integers for substring information */
30); /* number of elements (NOT size in bytes) */
// If the pattern matches...
if (count >= 0) {
// Get args out of pattern
rc = pcre_get_substring_list(at, ovector, count, &req->pattern_args);
req->handler = hdef->handler;
break;
}
// Try the next handler
hdef = hdef->next;
}
return 0;
}
int _http_parser__on_header_field(http_parser* parser, const char *at, size_t length) {
http_request_t* req = ((http_client_t*)parser->data)->request;
LOGF("[ %5d ] _http_parser__on_header_field %s", req->request_num, at);
switch (at[0]) {
case 'R':
if (length == 5) {
// Assume "Range"
req->current_header = HEADER_RANGE;
}
break;
default:
req->current_header = 0;
break;
}
return 0;
}
int _http_parser__on_header_value(http_parser* parser, const char *at, size_t length) {
http_request_t* req = ((http_client_t*)parser->data)->request;
char *dash = NULL;
LOGF("[ %5d ] _http_parser__on_header_value %s", req->request_num, at);
// Right now care about range requests
switch (req->current_header) {
case HEADER_RANGE:
// null out -
dash = memchr(at, length, '-');
if (dash != NULL) {
*dash = '\0';
req->range_start = atol(at);
if (++dash != NULL)
req->range_end = atol(dash);
}
break;
default:
break;
}
return 0;
}
int _http_parser__on_headers_complete(http_parser* parser) {
http_request_t* req = ((http_client_t*)parser->data)->request;
LOGF("[ %5d ] _http_parser__on_headers_complete", req->request_num);
return 0;
}
int _http_parser__on_body(http_parser* parser, const char *at, size_t length) {
http_request_t* req = ((http_client_t*)parser->data)->request;
LOGF("[ %5d ] _http_parser__on_body %s", req->request_num, at);
return 0;
}
int _http_parser__on_message_complete(http_parser* parser) {
int rv = 0;
http_request_t* req = ((http_client_t*)parser->data)->request;
LOGF("[ %5d ] _http_parser__on_message_complete", req->request_num);
switch (parser->method) {
case HTTP_GET:
// we have everything to process the GET
rv = 1; // Tell http_parser to just parse the rest, there is no body
if (req->handler != NULL) {
int ret = req->handler(req);
if (ret != 0) {
// Handle an error here
}
}
break;
case HTTP_POST:
case HTTP_PUT:
case HTTP_HEAD:
case HTTP_DELETE:
default:
// RETURN A 5XX message saying we don't support the method
break;
}
_http_request__finish(req);
return 0;
}
/*****************************************************************************
* HTTP Server Callback Functions
****************************************************************************/
// TODO Pool this memory
uv_buf_t _http_uv__on_alloc__cb(uv_handle_t* req, size_t suggested_size) {
uv_buf_t buf;
buf.base = malloc(suggested_size);
buf.len = suggested_size;
return buf;
}
static void _http_uv__on_read__cb(uv_stream_t* tcp, ssize_t nread, uv_buf_t buf) {
size_t parsed;
// Get the client
http_client_t *client = (http_client_t*)tcp->data;
if (nread >= 0) {
// Read Data for Client connection
parsed = http_parser_execute(&client->parser, &client->server->parser_settings, buf.base, nread);
if (parsed < nread || http_should_keep_alive(&client->parser)) {
// HTTP Parse Error
LOG_ERROR("parse error");
uv_close((uv_handle_t*) &client->handle, _http_uv__on_close__cb);
}
} else {
// No Data Read... Handle Error case
uv_err_t err = uv_last_error(client->server->uv_loop);
if (err.code != UV_EOF) {
UVERR(err, "read");
}
}
// Free memory that was allocated by _http_uv__on_alloc__cb
free(buf.base);
}
static void _http_uv__on_connect__cb(uv_stream_t* server_handle, int status) {
//LOGF("New Connection");
// Create/Initialize a HTTP Client
http_client_t *client = _http_client__init(server_handle);
// Start reading oof the Client
uv_read_start((uv_stream_t*)&client->handle, _http_uv__on_alloc__cb, _http_uv__on_read__cb);
}
static void _http_uv__on_close__cb(uv_handle_t* handle) {
//LOGF("[ %5d ] connection closed", client->request_num);
_http_client__finish((http_client_t*) handle->data);
}
static http_request_t *_http_request__init(http_client_t *client) {
// Alloc req
http_request_t *req = malloc(sizeof(http_request_t));
// Setup Req
req->client = client;
req->request_num = ++client->server->request_num;
return req;
}
static void _http_request__finish(http_request_t *req) {
// Check to see if http 1.1 and whether to keep connection open
http_client_t *client = req->client;
if (!http_should_keep_alive(&client->parser)) {
client->close_connection = 1;
}
client->request = NULL;
// Free up the Request obejct.
free(req);
}
static http_client_t *_http_client__init(uv_stream_t* server_handle) {
int r;
// Get the server
http_server_t *server = (http_server_t*)server_handle->data;
// Create Client
http_client_t *client = malloc(sizeof(http_client_t));
// Setup the Client
client->server = server;
client->request = NULL;
client->close_connection = 0;
// Initializing http parser for REQUST
http_parser_init(&client->parser, HTTP_REQUEST);
// Setup the parser data so we have access to the request
client->parser.data = client;
// Init UV stuff
uv_tcp_init(server->uv_loop, &client->handle);
r = uv_accept(server_handle, (uv_stream_t*)&client->handle);
// TODO handle uv_accept ERROR
// Set the handle's data so we can get our client in the read/write funcs
client->handle.data = client;
return client;
}
static void _http_client__finish(http_client_t *client) {
// TODO figure out uv_close and deletion of client / tcp connection
if (client->request != NULL) {
_http_request__finish(client->request);
}
// close the handle
// Assume this is called by the close function, so don't close the handle
// uv_close((uv_handle_t*) &client->handle, _http_uv__on_close__cb);
// No need to free up the http_parser memory because it's all contained
// in the client.
// Free up the memory of the client
free(client);
}
/*****************************************************************************
* HTTP Server API
****************************************************************************/
http_server_t *http_server_create(char *listen_addr, short port) {
int r;
http_server_t *server = malloc(sizeof(http_server_t));
// Init the handler list
server->handlers = NULL;
// Initialize the parser
http_parser_settings *parser = &server->parser_settings;
// Setup the handlers
parser->on_message_begin = _http_parser__on_message_begin;
parser->on_url = _http_parser__on_url;
parser->on_header_field = _http_parser__on_header_field;
parser->on_header_value = _http_parser__on_header_value;
parser->on_headers_complete = _http_parser__on_headers_complete;
parser->on_message_complete = _http_parser__on_message_complete;
// Create an event loop
server->uv_loop = uv_default_loop();
// Init a TCP "Server"
r = uv_tcp_init(server->uv_loop, &server->tcp);
CHECK(r, server->uv_loop, "bind");
server->tcp.data = server;
// Bind to the right addres/port
struct sockaddr_in address = uv_ip4_addr(listen_addr, port);
r = uv_tcp_bind(&server->tcp, address);
CHECK(r, server->uv_loop, "bind");
return server;
}
int http_server_delete(http_server_t *server) {
// Delete all the handlers...
http_reqest_handler_def_t *curr_handler = server->handlers;
while (curr_handler) {
http_reqest_handler_def_t *next = curr_handler;
// TODO delete pattern?
free(curr_handler);
curr_handler = next;
}
return 0;
}
int http_server_add_handler(http_server_t *server, const char *pattern, http_request_handler_func handler) {
const char *error;
int error_offset;
// setup the last_handler to start
http_reqest_handler_def_t *last = server->handlers;
http_reqest_handler_def_t *new_handler = malloc(sizeof(http_reqest_handler_def_t));
new_handler->pattern = pcre_compile(pattern, 0, &error, &error_offset, NULL);
new_handler->handler = handler;
// Add to the handlers list
if (last) {
while (last->next)
// find the last one in the list
last = last->next;
last->next = new_handler;
} else {
server->handlers = new_handler;
}
return 0;
}
int http_server_run(http_server_t *server) {
int r;
r = uv_listen((uv_stream_t*)&server->tcp, 128, _http_uv__on_connect__cb);
LOG("listening on port");
r = uv_run(server->uv_loop);
return 0;
}
int http_server_stop(http_server_t *server) {
// TODO Figure out if this is right??? I have no idea if I need to
uv_loop_delete(server->uv_loop);
return 0;
}
/*****************************************************************************
* HTTP Server Response API
****************************************************************************/
#define http_connection_header_value(req) \
(char*)(http_should_keep_alive(&(req)->client->parser) ? "close" : "keep-alive")
static void _http_request__write_callback(uv_write_t* write_req, int status) {
// get the callback object, which is in front of the write_req
http_write_cb_t *callback_obj = (http_write_cb_t*)(((uint8_t*)write_req) - sizeof(http_write_cb_t));
// Call our callback
if (callback_obj->cb != NULL) {
callback_obj->cb(callback_obj->data);
}
// Free up the memory
free(callback_obj);
}
static inline
int _http_request__write(http_request_t *req, uv_buf_t *buffers, int count, http_write_cb cb, void *cb_data) {
// Malloc memory for our extra callback stuff and the uv_write_t
http_write_cb_t *callback_obj = malloc(sizeof(http_write_cb_t) + sizeof(uv_write_t));
// Setup our own special callback
callback_obj->cb = cb;
callback_obj->data = cb_data;
// Do the write
return uv_write(
(uv_write_t*)(((uint8_t*)callback_obj) + sizeof(http_write_cb_t)), // uv_write_t ptr
(uv_stream_t*)&req->client->handle, // handle to write to
buffers, // uv_buf_t
count, // # of buffers to write
_http_request__write_callback
);
}
#define HTTP_RESPONSE_HEADERS \
"HTTP/1.1 %d %s\r\n" \
"Connection: %s\r\n" \
"Content-Type: %s\r\n" \
"Content-Length: %d\r\n" \
"%s\r\n"
int http_request_write_response_string(http_request_t *req, int status, const char *extra_headers,
const char *content_type, const char *content, const uint32_t content_length,
http_write_cb cb, void *cb_data) {
uv_buf_t b;
b.base = (char*)content;
b.len = content_length;
return http_request_write_response_buffers(req, status, extra_headers, content_type, (http_buf_t*)&b, 1, cb, cb_data);
}
int http_request_write_response_buffers(http_request_t *req, int status, const char *extra_headers,
const char *content_type, http_buf_t *content_buffers, int content_buffers_count,
http_write_cb cb, void *cb_data) {
uv_buf_t* buffers = (uv_buf_t*) content_buffers;
uv_buf_t header;
char *headers_buffer = malloc(RESPONSE_HEADER_SIZE);
int content_length = 0;
int length;
int i;
for (i=0; i < content_buffers_count; i++) {
content_length += buffers[i].len;
}
length = snprintf(
headers_buffer,
RESPONSE_HEADER_SIZE,
HTTP_RESPONSE_HEADERS,
status,
http_status_code_text(status),
http_connection_header_value(req),
content_type,
content_length,
extra_headers);
// Write headers
header.base = headers_buffer;
header.len = length;
_http_request__write(req, &header, 1, free, headers_buffer); // Call free on the headers buffer
_http_request__write(req, buffers, content_buffers_count, cb, cb_data); // Call callback sent for the content
return 0; // TODO what should I return here?
}
#define HTTP_RESPONSE_HEADERS_CHUNKED \
"HTTP/1.1 %d %s\r\n" \
"Connection: %s\r\n" \
"Content-Type: %s\r\n" \
"Transfer-Encoding: chunked\r\n" \
"%s\r\n"
int http_request_chunked_response_start(http_request_t *req, int status, const char *extra_headers, const char *content_type) {
uv_buf_t header;
char *headers_buffer = malloc(RESPONSE_HEADER_SIZE);
int length = snprintf(
headers_buffer,
RESPONSE_HEADER_SIZE,
HTTP_RESPONSE_HEADERS_CHUNKED,
status,
http_status_code_text(status),
http_connection_header_value(req),
content_type,
extra_headers);
// Write headers
header.base = headers_buffer;
header.len = length;
_http_request__write(req, &header, 1, free, headers_buffer); // Call free on the headers buffer
return 0;
}
int http_request_chunked_response_write(http_request_t *req, const char *data, int data_length, http_write_cb cb, void *cb_data) {
return 0;
uv_buf_t b;
char *headers_buffer = malloc(32);
int length = snprintf(headers_buffer, 32, "%X\r\n", length);
// Write headers
b.base = headers_buffer;
b.len = length;
_http_request__write(req, &b, 1, free, headers_buffer); // Call free on the headers buffer
// write content
b.base = (char*)data;
b.len = data_length;
_http_request__write(req, &b, 1, cb, cb_data); // Call free on the headers buffer
return 0;
}
int http_request_chunked_response_end(http_request_t *req) {
return 0;
}
/*****************************************************************************
* HTTP Utility Functions
****************************************************************************/
const char* http_status_code_text(uint32_t status) {
switch(status)
{
case 100: return "Continue";
case 101: return "Switching Protocols";
case 200: return "OK";
case 201: return "Created";
case 202: return "Accepted";
case 203: return "Non-Authoritative Information";
case 204: return "No Content";
case 205: return "Reset Content";
case 206: return "Partial Content";
case 300: return "Multiple Choices";
case 301: return "Moved Permanently";
case 302: return "Found";
case 303: return "See Other";
case 304: return "Not Modified";
case 305: return "Use Proxy";
//case 306: return "(reserved)";
case 307: return "Temporary Redirect";
case 400: return "Bad Request";
case 401: return "Unauthorized";
case 402: return "Payment Required";
case 403: return "Forbidden";
case 404: return "Not Found";
case 405: return "Method Not Allowed";
case 406: return "Not Acceptable";
case 407: return "Proxy Authentication Required";
case 408: return "Request Timeout";
case 409: return "Conflict";
case 410: return "Gone";
case 411: return "Length Required";
case 412: return "Precondition Failed";
case 413: return "Request Entity Too Large";
case 414: return "Request-URI Too Long";
case 415: return "Unsupported Media Type";
case 416: return "Requested Range Not Satisfiable";
case 417: return "Expectation Failed";
case 500: return "Internal Server Error";
case 501: return "Not Implemented";
case 502: return "Bad Gateway";
case 503: return "Service Unavailable";
case 504: return "Gateway Timeout";
case 505: return "HTTP Version Not Supported";
default: break;
}
return "UNKNOWN STATUS CODE";
}