citadel/event_client.h

   1 /*
   2  *
   3  * Copyright (c) 1998-2012 by the citadel.org team
   4  *
   5  *  This program is open source software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #ifndef __EVENT_CLIENT_H__
  21 #define __EVENT_CLIENT_H__
  22 #define EV_COMPAT3 0
  23 #include "sysconfig.h"
  24 #include <ev.h>
  25 #include <sys/types.h>
  26 #include <sys/socket.h>
  27 #include <netdb.h>
  28 #include <arpa/nameser.h>
  29 #include <ares.h>
  30 #include <curl/curl.h>
  31
  32 typedef struct AsyncIO AsyncIO;
  33
  34 typedef enum _eNextState {
  35         eSendDNSQuery,
  36         eReadDNSReply,
  37
  38         eDBQuery,
  39
  40         eConnect,
  41         eSendReply,
  42         eSendMore,
  43         eSendFile,
  44
  45         eReadMessage,
  46         eReadMore,
  47         eReadPayload,
  48         eReadFile,
  49
  50         eTerminateConnection,
  51         eAbort
  52 }eNextState;
  53
  54 typedef eNextState (*IO_CallBack)(AsyncIO *IO);
  55 typedef eReadState (*IO_LineReaderCallback)(AsyncIO *IO);
  56 typedef void (*ParseDNSAnswerCb)(AsyncIO*, unsigned char*, int);
  57 typedef void (*FreeDNSReply)(void *DNSData);
  58
  59
  60 typedef struct __ReadAsyncMsg {
  61         StrBuf *MsgBuf;
  62         size_t maxlen;          /* maximum message length */
  63
  64         const char *terminator; /* token signalling EOT */
  65         long tlen;
  66         int dodot;
  67
  68         int flushing;
  69 /* if we read maxlen, read until nothing more arives and ignore this. */
  70
  71         int crlf;               /* CRLF newlines instead of LF */
  72 } ReadAsyncMsg;
  73
  74
  75 typedef struct _DNSQueryParts {
  76         ParseDNSAnswerCb DNS_CB;
  77         IO_CallBack PostDNS;
  78
  79         int DNSStatus;
  80         void *VParsedDNSReply;
  81         FreeDNSReply DNSReplyFree;
  82         void *Data;
  83 } DNSQueryParts;
  84
  85 typedef struct _evcurl_request_data
  86 {
  87         CURL                    *chnd;
  88         struct curl_slist       *headers;
  89         char                     errdesc[CURL_ERROR_SIZE];
  90
  91         int                      attached;
  92
  93         char                    *PlainPostData;
  94         long                     PlainPostDataLen;
  95         StrBuf                  *PostData;
  96
  97         StrBuf                  *ReplyData;
  98         long                     httpcode;
  99 } evcurl_request_data;
 100
 101 /* DNS Related */
 102 typedef struct __evcares_data {
 103         ev_io recv_event,
 104                 send_event;
 105         ev_timer timeout;           /* timeout while requesting ips */
 106 #ifdef DEBUG_CARES
 107         short int SourcePort;
 108 #endif
 109         struct ares_options Options;
 110         ares_channel Channel;
 111         DNSQueryParts *Query;
 112
 113         IO_CallBack Fail;      /* the dns lookup didn't work out. */
 114 } evcares_data;
 115
 116 struct AsyncIO {
 117         long ID;
 118         eNextState NextState;
 119
 120         /* connection related */
 121         ParsedURL *ConnectMe;
 122
 123         /* read/send related... */
 124         StrBuf *IOBuf;
 125         IOBuffer SendBuf,
 126                 RecvBuf;
 127
 128         FDIOBuffer IOB;
 129         /* when sending from / reading into files, this is used. */
 130
 131         /* our events... */
 132         ev_cleanup abort_by_shutdown, /* server wants to go down... */
 133                 db_abort_by_shutdown; /* server wants to go down... */
 134         ev_timer conn_fail,           /* connection establishing timed out */
 135                 rw_timeout;           /* timeout while sending data */
 136         ev_idle unwind_stack,         /* get c-ares out of the stack */
 137                 db_unwind_stack,      /* wait for next db operation... */
 138                 conn_fail_immediate;  /* unwind stack, but fail immediately. */
 139         ev_io recv_event,             /* receive data from the client */
 140                 send_event,           /* send more data to the client */
 141                 conn_event;           /* Connection successfully established */
 142
 143         StrBuf *ErrMsg; /* if we fail to connect, or lookup, error goes here. */
 144
 145         /* Citadel application callbacks... */
 146         IO_CallBack ReadDone, /* Theres new data to read... */
 147                 SendDone,     /* we may send more data */
 148                 Terminate,    /* shutting down... */
 149                 Timeout,      /* Timeout handler;may also be conn. timeout */
 150                 ConnFail,     /* What to do when one connection failed? */
 151                 ShutdownAbort,/* we're going down. make your piece. */
 152                 NextDBOperation; /* Perform Database IO */
 153
 154         /* if we have linereaders, maybe we want to read more lines before
 155          * the real application logic is called? */
 156         IO_LineReaderCallback LineReader;
 157
 158         evcares_data DNS;
 159
 160         evcurl_request_data HttpReq;
 161
 162         /* Saving / loading a message async from / to disk */
 163         ReadAsyncMsg *ReadMsg;
 164         struct CtdlMessage *AsyncMsg;
 165         struct recptypes *AsyncRcp;
 166
 167         /* Context specific data; Hint: put AsyncIO in there */
 168         void *Data;        /* application specific data */
 169         void *CitContext;  /* Citadel Session context... */
 170 };
 171
 172 typedef struct _IOAddHandler {
 173         AsyncIO *IO;
 174         IO_CallBack EvAttch;
 175 } IOAddHandler;
 176
 177 #define CCID ((CitContext*)IO->CitContext)->cs_pid
 178
 179 #define EV_syslog(LEVEL, FORMAT, ...) \
 180         syslog(LEVEL, "IO[%ld]CC[%d]" FORMAT, IO->ID, CCID, __VA_ARGS__)
 181
 182 #define EVM_syslog(LEVEL, FORMAT) \
 183         syslog(LEVEL, "IO[%ld]CC[%d]" FORMAT, IO->ID, CCID)
 184
 185 #define EVNC_syslog(LEVEL, FORMAT, ...) \
 186         syslog(LEVEL, "IO[%ld]" FORMAT, IO->ID, __VA_ARGS__)
 187
 188 #define EVNCM_syslog(LEVEL, FORMAT) syslog(LEVEL, "IO[%ld]" FORMAT, IO->ID)
 189
 190 void FreeAsyncIOContents(AsyncIO *IO);
 191
 192 eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB);
 193 eNextState QueueDBOperation(AsyncIO *IO, IO_CallBack CB);
 194 eNextState QueueEventContext(AsyncIO *IO, IO_CallBack CB);
 195 eNextState QueueCurlContext(AsyncIO *IO);
 196
 197 eNextState EvConnectSock(AsyncIO *IO,
 198                          double conn_timeout,
 199                          double first_rw_timeout,
 200                          int ReadFirst);
 201 void IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents);
 202
 203 int QueueQuery(ns_type Type,
 204                const char *name,
 205                AsyncIO *IO,
 206                DNSQueryParts *QueryParts,
 207                IO_CallBack PostDNS);
 208
 209 void QueueGetHostByName(AsyncIO *IO,
 210                         const char *Hostname,
 211                         DNSQueryParts *QueryParts,
 212                         IO_CallBack PostDNS);
 213
 214 void QueryCbDone(AsyncIO *IO);
 215
 216 void StopClient(AsyncIO *IO);
 217
 218 void StopClientWatchers(AsyncIO *IO);
 219
 220 void SetNextTimeout(AsyncIO *IO, double timeout);
 221
 222 void InitC_ares_dns(AsyncIO *IO);
 223
 224 #include <curl/curl.h>
 225
 226 #define OPT(s, v) \
 227         do { \
 228                 sta = curl_easy_setopt(chnd, (CURLOPT_##s), (v));       \
 229                 if (sta)  {                                             \
 230                         syslog(LOG_ERR,                         \
 231                                "error setting option " #s               \
 232                                " on curl handle: %s",                   \
 233                                curl_easy_strerror(sta));                \
 234         } } while (0)
 235
 236 void InitIOStruct(AsyncIO *IO,
 237                   void *Data,
 238                   eNextState NextState,
 239                   IO_LineReaderCallback LineReader,
 240                   IO_CallBack DNS_Fail,
 241                   IO_CallBack SendDone,
 242                   IO_CallBack ReadDone,
 243                   IO_CallBack Terminate,
 244                   IO_CallBack ConnFail,
 245                   IO_CallBack Timeout,
 246                   IO_CallBack ShutdownAbort);
 247
 248 int InitcURLIOStruct(AsyncIO *IO,
 249                      void *Data,
 250                      const char* Desc,
 251                      IO_CallBack SendDone,
 252                      IO_CallBack Terminate,
 253                      IO_CallBack ShutdownAbort);
 254
 255 eNextState ReAttachIO(AsyncIO *IO,
 256                       void *pData,
 257                       int ReadFirst);
 258
 259 #endif /* __EVENT_CLIENT_H__ */