root/third_party/libevent/http-internal.h

INCLUDED FROM

/*
 * Copyright 2001 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * This header file contains definitions for dealing with HTTP requests
 * that are internal to libevent.  As user of the library, you should not
 * need to know about these.
 */

#ifndef _HTTP_H_
#define _HTTP_H_

#define HTTP_CONNECT_TIMEOUT    45
#define HTTP_WRITE_TIMEOUT      50
#define HTTP_READ_TIMEOUT       50

#define HTTP_PREFIX             "http://"
#define HTTP_DEFAULTPORT        80

enum message_read_status {
        ALL_DATA_READ = 1,
        MORE_DATA_EXPECTED = 0,
        DATA_CORRUPTED = -1,
        REQUEST_CANCELED = -2
};

enum evhttp_connection_error {
        EVCON_HTTP_TIMEOUT,
        EVCON_HTTP_EOF,
        EVCON_HTTP_INVALID_HEADER
};

struct evbuffer;
struct addrinfo;
struct evhttp_request;

/* A stupid connection object - maybe make this a bufferevent later */

enum evhttp_connection_state {
        EVCON_DISCONNECTED,     /**< not currently connected not trying either*/
        EVCON_CONNECTING,       /**< tries to currently connect */
        EVCON_IDLE,             /**< connection is established */
        EVCON_READING_FIRSTLINE,/**< reading Request-Line (incoming conn) or
                                 **< Status-Line (outgoing conn) */
        EVCON_READING_HEADERS,  /**< reading request/response headers */
        EVCON_READING_BODY,     /**< reading request/response body */
        EVCON_READING_TRAILER,  /**< reading request/response chunked trailer */
        EVCON_WRITING           /**< writing request/response headers/body */
};

struct event_base;

struct evhttp_connection {
        /* we use tailq only if they were created for an http server */
        TAILQ_ENTRY(evhttp_connection) (next);

        int fd;
        struct event ev;
        struct event close_ev;
        struct evbuffer *input_buffer;
        struct evbuffer *output_buffer;
        
        char *bind_address;             /* address to use for binding the src */
        u_short bind_port;              /* local port for binding the src */

        char *address;                  /* address to connect to */
        u_short port;

        int flags;
#define EVHTTP_CON_INCOMING     0x0001  /* only one request on it ever */
#define EVHTTP_CON_OUTGOING     0x0002  /* multiple requests possible */
#define EVHTTP_CON_CLOSEDETECT  0x0004  /* detecting if persistent close */

        int timeout;                    /* timeout in seconds for events */
        int retry_cnt;                  /* retry count */
        int retry_max;                  /* maximum number of retries */
        
        enum evhttp_connection_state state;

        /* for server connections, the http server they are connected with */
        struct evhttp *http_server;

        TAILQ_HEAD(evcon_requestq, evhttp_request) requests;
        
                                                   void (*cb)(struct evhttp_connection *, void *);
        void *cb_arg;
        
        void (*closecb)(struct evhttp_connection *, void *);
        void *closecb_arg;

        struct event_base *base;
};

struct evhttp_cb {
        TAILQ_ENTRY(evhttp_cb) next;

        char *what;

        void (*cb)(struct evhttp_request *req, void *);
        void *cbarg;
};

/* both the http server as well as the rpc system need to queue connections */
TAILQ_HEAD(evconq, evhttp_connection);

/* each bound socket is stored in one of these */
struct evhttp_bound_socket {
        TAILQ_ENTRY(evhttp_bound_socket) (next);

        struct event  bind_ev;
};

struct evhttp {
        TAILQ_HEAD(boundq, evhttp_bound_socket) sockets;

        TAILQ_HEAD(httpcbq, evhttp_cb) callbacks;
        struct evconq connections;

        int timeout;

        void (*gencb)(struct evhttp_request *req, void *);
        void *gencbarg;

        struct event_base *base;
};

/* resets the connection; can be reused for more requests */
void evhttp_connection_reset(struct evhttp_connection *);

/* connects if necessary */
int evhttp_connection_connect(struct evhttp_connection *);

/* notifies the current request that it failed; resets connection */
void evhttp_connection_fail(struct evhttp_connection *,
    enum evhttp_connection_error error);

void evhttp_get_request(struct evhttp *, int, struct sockaddr *, socklen_t);

int evhttp_hostportfile(char *, char **, u_short *, char **);

int evhttp_parse_firstline(struct evhttp_request *, struct evbuffer*);
int evhttp_parse_headers(struct evhttp_request *, struct evbuffer*);

void evhttp_start_read(struct evhttp_connection *);
void evhttp_make_header(struct evhttp_connection *, struct evhttp_request *);

void evhttp_write_buffer(struct evhttp_connection *,
    void (*)(struct evhttp_connection *, void *), void *);

/* response sending HTML the data in the buffer */
void evhttp_response_code(struct evhttp_request *, int, const char *);
void evhttp_send_page(struct evhttp_request *, struct evbuffer *);

#endif /* _HTTP_H */