citadel/event_client.h

   1 #include <ev.h>
   2 #include <sys/types.h>
   3 #include <sys/socket.h>
   4 #include <netdb.h>
   5 #include <arpa/nameser.h>
   6 #include <ares.h>
   7 #include <curl/curl.h>
   8
   9 typedef struct AsyncIO AsyncIO;
  10
  11 typedef enum _eNextState {
  12         eSendDNSQuery,
  13         eReadDNSReply,
  14         eConnect,
  15         eSendReply,
  16         eSendMore,
  17         eReadMessage,
  18         eTerminateConnection,
  19         eAbort
  20 }eNextState;
  21
  22 typedef eNextState (*IO_CallBack)(AsyncIO *IO);
  23 typedef eReadState (*IO_LineReaderCallback)(AsyncIO *IO);
  24 typedef void (*ParseDNSAnswerCb)(AsyncIO*, unsigned char*, int);
  25 typedef void (*FreeDNSReply)(void *DNSData);
  26
  27 typedef struct _DNSQueryParts {
  28         ParseDNSAnswerCb DNS_CB;
  29         IO_CallBack PostDNS;
  30
  31         int DNSStatus;
  32         void *VParsedDNSReply;
  33         FreeDNSReply DNSReplyFree;
  34         void *Data;
  35 } DNSQueryParts;
  36
  37 typedef struct _evcurl_request_data
  38 {
  39         CURL              *chnd;
  40         struct curl_slist *headers;
  41         char               errdesc[CURL_ERROR_SIZE];
  42
  43         int                attached;
  44
  45         char              *PlainPostData;
  46         long               PlainPostDataLen;
  47         StrBuf            *PostData;
  48
  49         StrBuf            *ReplyData;
  50         long               httpcode;
  51 } evcurl_request_data;
  52
  53 struct AsyncIO {
  54         eNextState NextState;
  55
  56         /* connection related */
  57         ParsedURL *ConnectMe;
  58
  59         /* read/send related... */
  60         StrBuf *IOBuf;
  61         IOBuffer SendBuf,
  62                 RecvBuf;
  63
  64         /* our events... */
  65         ev_cleanup abort_by_shutdown; /* server wants to go down... */
  66         ev_timer conn_fail,           /* connection establishing timed out */
  67                 rw_timeout;           /* timeout while sending data */
  68         ev_idle unwind_stack,         /* get c-ares out of the stack */
  69                 conn_fail_immediate;  /* unwind stack, but fail immediately. */
  70         ev_io recv_event,             /* receive data from the client */
  71                 send_event,           /* send more data to the client */
  72                 conn_event;           /* Connection successfully established */
  73
  74         StrBuf *ErrMsg; /* if we fail to connect, or lookup, error goes here. */
  75
  76         /* Citadel application callbacks... */
  77         IO_CallBack ReadDone, /* Theres new data to read... */
  78                 SendDone,     /* we may send more data */
  79                 Terminate,    /* shutting down... */
  80                 Timeout,      /* Timeout handler; may also be connection timeout */
  81                 ConnFail,     /* What to do when one connection failed? */
  82                 ShutdownAbort;/* we're going down. make your piece. */
  83
  84         IO_LineReaderCallback LineReader; /* if we have linereaders, maybe we want to read more lines before the real application logic is called? */
  85
  86         /* DNS Related */
  87         ev_io dns_recv_event,
  88                 dns_send_event;
  89         struct ares_options DNSOptions;
  90         ares_channel DNSChannel;
  91         DNSQueryParts *DNSQuery;
  92
  93         evcurl_request_data HttpReq;
  94
  95         /* Saving / loading a message async from / to disk */
  96
  97         struct CtdlMessage *AsyncMsg;
  98         struct recptypes AsyncRcp;
  99         /* Custom data; its expected to contain  AsyncIO so we can save malloc()s... */
 100         void *Data;        /* application specific data */
 101         void *CitContext;  /* Citadel Session context... */
 102 };
 103
 104 typedef struct _IOAddHandler {
 105         AsyncIO *IO;
 106         IO_CallBack EvAttch;
 107 }IOAddHandler;
 108
 109 void FreeAsyncIOContents(AsyncIO *IO);
 110
 111 int QueueEventContext(AsyncIO *IO, IO_CallBack CB);
 112 int ShutDownEventQueue(void);
 113
 114 eNextState InitEventIO(AsyncIO *IO,
 115                        void *pData,
 116                        double conn_timeout,
 117                        double first_rw_timeout,
 118                        int ReadFirst);
 119 void IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents);
 120
 121 int QueueQuery(ns_type Type, const char *name, AsyncIO *IO, DNSQueryParts *QueryParts, IO_CallBack PostDNS);
 122 void QueueGetHostByName(AsyncIO *IO, const char *Hostname, DNSQueryParts *QueryParts, IO_CallBack PostDNS);
 123
 124 void QueryCbDone(AsyncIO *IO);
 125
 126 void StopClient(AsyncIO *IO);
 127
 128 void StopClientWatchers(AsyncIO *IO);
 129
 130 void SetNextTimeout(AsyncIO *IO, double timeout);
 131
 132 void InitC_ares_dns(AsyncIO *IO);
 133
 134 #include <curl/curl.h>
 135
 136 #define OPT(s, v) \
 137         do { \
 138                 sta = curl_easy_setopt(chnd, (CURLOPT_##s), (v)); \
 139                 if (sta)  {                                             \
 140                         CtdlLogPrintf(CTDL_ERR, "error setting option " #s " on curl handle: %s", curl_easy_strerror(sta)); \
 141         } } while (0)
 142
 143
 144 int evcurl_init(AsyncIO *IO,
 145                 void *CustomData,
 146                 const char* Desc,
 147                 IO_CallBack CallBack);
 148
 149 void evcurl_handle_start(AsyncIO *IO);