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
   8 typedef struct AsyncIO AsyncIO;
   9
  10 typedef enum _eNextState {
  11         eSendReply,
  12         eSendMore,
  13         eReadMessage,
  14         eTerminateConnection,
  15         eAbort
  16 }eNextState;
  17
  18 typedef int (*EventContextAttach)(void *Data);
  19 typedef eNextState (*IO_CallBack)(void *Data);
  20 typedef eReadState (*IO_LineReaderCallback)(AsyncIO *IO);
  21 typedef void (*ParseDNSAnswerCb)(AsyncIO*, unsigned char*, int);
  22 typedef void (*FreeDNSReply)(void *DNSData);
  23
  24 struct AsyncIO {
  25         StrBuf *Host;
  26         char service[32];
  27
  28         /* To cycle through several possible services... */
  29         struct addrinfo *res;
  30         struct addrinfo *curr_ai;
  31
  32         /* connection related */
  33         int IP6;
  34         struct hostent *HEnt;
  35         int sock;
  36         unsigned short dport;
  37         int active_event;
  38         eNextState NextState;
  39
  40         ev_timer conn_fail,
  41                 conn_timeout;
  42         ev_io recv_event,
  43                 send_event;
  44         StrBuf *ErrMsg; /* if we fail to connect, or lookup, error goes here. */
  45
  46         /* read/send related... */
  47         StrBuf *IOBuf;
  48         IOBuffer SendBuf,
  49                 RecvBuf;
  50
  51         /* Citadel application callbacks... */
  52         IO_CallBack ReadDone, /* Theres new data to read... */
  53                 SendDone,     /* we may send more data */
  54                 Terminate,    /* shutting down... */
  55                 Timeout,      /* Timeout handler; may also be connection timeout */
  56                 ConnFail;     /* What to do when one connection failed? */
  57
  58         IO_LineReaderCallback LineReader; /* if we have linereaders, maybe we want to read more lines before the real application logic is called? */
  59
  60
  61         int active_dns_event;
  62         ev_io dns_recv_event,
  63                 dns_send_event;
  64         struct ares_options DNSOptions;
  65         ares_channel DNSChannel;
  66
  67         ParseDNSAnswerCb DNS_CB;
  68         IO_CallBack PostDNS;
  69
  70         int DNSStatus;
  71         void *VParsedDNSReply;
  72         FreeDNSReply DNSReplyFree;
  73
  74         /* Custom data; its expected to contain  AsyncIO so we can save malloc()s... */
  75         DeleteHashDataFunc DeleteData; /* so if we have to destroy you, what to do... */
  76         void *Data; /* application specific data */
  77 };
  78
  79 typedef struct _IOAddHandler {
  80         void *Ctx;
  81         EventContextAttach EvAttch;
  82 }IOAddHandler;
  83
  84 void FreeAsyncIOContents(AsyncIO *IO);
  85
  86 int QueueEventContext(void *Ctx, AsyncIO *IO, EventContextAttach CB);
  87 int ShutDownEventQueue(void);
  88
  89 void InitEventIO(AsyncIO *IO,
  90                  void *pData,
  91                  IO_CallBack ReadDone,
  92                  IO_CallBack SendDone,
  93                  IO_CallBack Terminate,
  94                  IO_CallBack Timeout,
  95                  IO_CallBack ConnFail,
  96                  IO_LineReaderCallback LineReader,
  97                  int conn_timeout, int first_rw_timeout,
  98                  int ReadFirst);
  99
 100 int QueueQuery(ns_type Type, char *name, AsyncIO *IO, IO_CallBack PostDNS);