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   1 /* -*- Mode: C; tab-width: 2; c-basic-offset: 2; indent-tabs-mode: nil -*- */
   2 #ifndef LIBMEMCACHED_PROTOCOL_COMMON_H
   3 #define LIBMEMCACHED_PROTOCOL_COMMON_H
   4
   5 #include "config.h"
   6 #include <stdbool.h>
   7 #include <assert.h>
   8 #include <netinet/in.h>
   9
  10 /* Define this here, which will turn on the visibilty controls while we're
  11  * building libmemcached.
  12  */
  13 #define BUILDING_LIBMEMCACHED 1
  14
  15 #include <libmemcached/byteorder.h>
  16 #include <libmemcached/protocol_handler.h>
  17 #include <libmemcached/protocol/cache.h>
  18
  19 /*
  20  * I don't really need the following two functions as function pointers
  21  * in the instance handle, but I don't want to put them in the global
  22  * namespace for those linking statically (personally I don't like that,
  23  * but some people still do). If it ever shows up as a performance thing
  24  * I'll look into optimizing this ;-)
  25  */
  26 typedef bool (*drain_func)(memcached_protocol_client_st *client);
  27 typedef protocol_binary_response_status (*spool_func)(memcached_protocol_client_st *client,
  28                                                       const void *data,
  29                                                       size_t length);
  30
  31 /**
  32  * Definition of the per instance structure.
  33  */
  34 struct memcached_protocol_st {
  35   memcached_binary_protocol_callback_st *callback;
  36   memcached_protocol_recv_func recv;
  37   memcached_protocol_send_func send;
  38
  39   /*
  40    * I really don't need these as funciton pointers, but I don't want
  41    * to clutter the namespace if someone links statically.
  42    */
  43   drain_func drain;
  44   spool_func spool;
  45
  46   /*
  47    * To avoid keeping a buffer in each client all the time I have a
  48    * bigger buffer in the instance that I read to initially, and then
  49    * I try to parse and execute as much from the buffer. If I wasn't able
  50    * to process all data I'll keep that in a per-connection buffer until
  51    * the next time I can read from the socket.
  52    */
  53   uint8_t *input_buffer;
  54   size_t input_buffer_size;
  55
  56   bool pedantic;
  57   /* @todo use multiple sized buffers */
  58   cache_t *buffer_cache;
  59 };
  60
  61 struct chunk_st {
  62   /* Pointer to the data */
  63   char *data;
  64   /* The offset to the first byte into the buffer that is used */
  65   size_t offset;
  66   /* The offset into the buffer for the first free byte */
  67   size_t nbytes;
  68   /* The number of bytes in the buffer */
  69   size_t size;
  70   /* Pointer to the next buffer in the chain */
  71   struct chunk_st *next;
  72 };
  73
  74 #define CHUNK_BUFFERSIZE 2048
  75
  76 typedef memcached_protocol_event_t (*process_data)(struct memcached_protocol_client_st *client, ssize_t *length, void **endptr);
  77
  78 enum ascii_cmd {
  79   GET_CMD,
  80   GETS_CMD,
  81   SET_CMD,
  82   ADD_CMD,
  83   REPLACE_CMD,
  84   CAS_CMD,
  85   APPEND_CMD,
  86   PREPEND_CMD,
  87   DELETE_CMD,
  88   INCR_CMD,
  89   DECR_CMD,
  90   STATS_CMD,
  91   FLUSH_ALL_CMD,
  92   VERSION_CMD,
  93   QUIT_CMD,
  94   VERBOSITY_CMD,
  95   UNKNOWN_CMD,
  96 };
  97
  98 struct memcached_protocol_client_st {
  99   memcached_protocol_st *root;
 100   int sock;
 101   int error;
 102
 103   /* Linked list of data to send */
 104   struct chunk_st *output;
 105   struct chunk_st *output_tail;
 106
 107   /*
 108    * While we process input data, this is where we spool incomplete commands
 109    * if we need to receive more data....
 110    * @todo use the buffercace
 111    */
 112   uint8_t *input_buffer;
 113   size_t input_buffer_size;
 114   size_t input_buffer_offset;
 115
 116   /* The callback to the protocol handler to use (ascii or binary) */
 117   process_data work;
 118
 119   /*
 120    * Should the spool data discard the data to send or not? (aka noreply in
 121    * the ascii protocol..
 122    */
 123   bool mute;
 124
 125   /* Members used by the binary protocol */
 126   protocol_binary_request_header *current_command;
 127
 128   /* Members used by the ascii protocol */
 129   enum ascii_cmd ascii_command;
 130 };
 131
 132 #include "ascii_handler.h"
 133 #include "binary_handler.h"
 134
 135 #endif