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/* libanode: the Anode C reference implementation
* Copyright (C) 2009-2010 Adam Ierymenko <adam.ierymenko@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef _ANODE_HTTP_CLIENT_H
#define _ANODE_HTTP_CLIENT_H
#include <stdio.h>
#include <stdlib.h>
#include "dictionary.h"
#include "../anode.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* HTTP request type
*/
enum AnodeHttpClientRequestMethod
{
ANODE_HTTP_GET = 0,
ANODE_HTTP_HEAD = 1,
ANODE_HTTP_POST = 2
};
/*
* Special response codes to indicate I/O errors
*/
#define ANODE_HTTP_SPECIAL_RESPONSE_DNS_RESOLVE_FAILED -1
#define ANODE_HTTP_SPECIAL_RESPONSE_CONNECT_FAILED -2
#define ANODE_HTTP_SPECIAL_RESPONSE_HEADERS_TOO_LARGE -3
#define ANODE_HTTP_SPECIAL_RESPONSE_SERVER_CLOSED_CONNECTION -4
#define ANODE_HTTP_SPECIAL_RESPONSE_INVALID_RESPONSE -5
/**
* Simple HTTP client
*/
struct AnodeHttpClient
{
/**
* Request URI
*/
AnodeURI uri;
/**
* Request method: GET, PUT, HEAD, or POST
*/
enum AnodeHttpClientRequestMethod method;
/**
* Data for POST requests
*
* It is your responsibility to manage and/or free this pointer. The HTTP
* client only reads from it.
*/
const void *data;
unsigned int data_length;
/**
* Content type for data, or null for application/x-www-form-urlencoded
*/
const char *data_content_type;
/**
* Set to non-zero to use HTTP connection keepalive
*
* If keepalive is enabled, this request can be modified and re-used and
* its associated connection will stay open (being reopened if needed)
* until it is freed.
*
* Note that this client is too dumb to pool connections and pick them on
* the basis of host. Keepalive mode should only be set if the next request
* will be from the same host and port, otherwise you will get a '404'.
*/
int keepalive;
/**
* Function pointer to be called when request is complete (or fails)
*/
void (*handler)(struct AnodeHttpClient *);
/**
* Two arbitrary pointers that can be stored here for use by the handler.
* These are not accessed or modified by the client.
*/
void *ptr[2];
/**
* Request headers
*/
struct AnodeDictionary headers;
struct {
/**
* Response code, set on completion or failure before handler is called
*
* Also check for the special response codes defined in http_client.h as
* these negative codes indicate network or other errors.
*/
int code;
/**
* Response data, for GET and POST requests
*/
void *data;
/**
* Length of response data
*/
unsigned int data_length;
/**
* Response headers
*/
struct AnodeDictionary headers;
} response;
/**
* Internal fields used by implementation
*/
struct {
/* Transport engine being used by request */
AnodeTransportEngine *transport_engine;
/* Connection to which request has been sent, or null if none */
struct AnodeHttpConnection *connection;
/* Buffer for reading chunked mode chunk lines (can't use data buf) */
char header_line_buf[256];
unsigned int header_line_buf_ptr;
/* Where are we in sending request data? */
unsigned int request_data_ptr;
/* Capacity of response_data buffer */
unsigned int response_data_capacity;
/* How much response data are we currently expecting? */
/* This is content-length in block mode or chunk length in chunked mode */
unsigned int expecting_response_length;
/* Read mode */
enum {
ANODE_HTTP_READ_MODE_WAITING = 0,
ANODE_HTTP_READ_MODE_HEADERS = 1,
ANODE_HTTP_READ_MODE_BLOCK = 2,
ANODE_HTTP_READ_MODE_CHUNKED_CHUNK_SIZE = 3,
ANODE_HTTP_READ_MODE_CHUNKED_DATA = 4,
ANODE_HTTP_READ_MODE_CHUNKED_FOOTER = 5
} read_mode;
/* Connection from transport engine */
AnodeTransportTcpConnection *tcp_connection;
/* Write buffer */
unsigned char outbuf[16384];
unsigned int outbuf_len;
/* Phase of request state machine */
enum {
ANODE_HTTP_REQUEST_PHASE_RESOLVE = 0,
ANODE_HTTP_REQUEST_PHASE_CONNECT = 1,
ANODE_HTTP_REQUEST_PHASE_SEND = 2,
ANODE_HTTP_REQUEST_PHASE_RECEIVE = 3,
ANODE_HTTP_REQUEST_PHASE_KEEPALIVE = 4,
ANODE_HTTP_REQUEST_PHASE_CLOSED = 5
} phase;
/* Has request object been freed? */
int freed;
/**
* Pointer used internally for putting requests into linked lists
*/
struct AnodeHttpClient *next;
} impl;
};
struct AnodeHttpClient *AnodeHttpClient_new(AnodeTransportEngine *transport_engine);
void AnodeHttpClient_send(struct AnodeHttpClient *client);
void AnodeHttpClient_free(struct AnodeHttpClient *client);
#ifdef __cplusplus
}
#endif
#endif
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