X-Git-Url: https://git.m6w6.name/?a=blobdiff_plain;f=libmemcached%2Ferror.cc;h=3de8ece52be8ef41055b1dfb88e864de77d57da3;hb=398f48445cacf12679248142f0c86d3a0d6caab6;hp=b2af961a6364b36b9f2662fba7bdb3f47c40edc3;hpb=16727efd684309de458393e10b47f1e354aa3616;p=awesomized%2Flibmemcached

diff --git a/libmemcached/error.cc b/libmemcached/error.cc
index b2af961a..3de8ece5 100644
--- a/libmemcached/error.cc
+++ b/libmemcached/error.cc
@@ -36,12 +36,17 @@
  */
 
 #include <libmemcached/common.h>
+
+#include "libmemcached/assert.hpp"
+
+#include <cerrno>
 #include <cstdarg>
+#include <cstdio>
 
 #define MAX_ERROR_LENGTH 2048
 struct memcached_error_t
 {
-  memcached_st *root;
+  Memcached *root;
   uint64_t query_id;
   struct memcached_error_t *next;
   memcached_return_t rc;
@@ -50,183 +55,215 @@ struct memcached_error_t
   char message[MAX_ERROR_LENGTH];
 };
 
-static void _set(memcached_server_st& server, memcached_st& memc)
+static void _set(memcached_instance_st& server, Memcached& memc)
 {
-  if (server.error_messages && server.error_messages->query_id != server.root->query_id)
+  if (server.error_messages and server.error_messages->query_id != server.root->query_id)
   {
     memcached_error_free(server);
   }
 
-  if (memc.error_messages == NULL)
+  if (memc.error_messages)
   {
-    return;
-  }
+    if (memc.error_messages->rc == MEMCACHED_TIMEOUT)
+    {
+      server.io_wait_count.timeouts++;
+    }
 
-  memcached_error_t *error= libmemcached_xmalloc(&memc, memcached_error_t);
-  if (error == NULL) // Bad business if this happens
-  {
-    return;
+    memcached_error_t *error= libmemcached_xmalloc(&memc, memcached_error_t);
+    if (error)
+    {
+      memcpy(error, memc.error_messages, sizeof(memcached_error_t));
+      error->next= server.error_messages;
+      server.error_messages= error;
+    }
   }
-
-  memcpy(error, memc.error_messages, sizeof(memcached_error_t));
-  error->next= server.error_messages;
-  server.error_messages= error;
 }
 
 #if 0
 static int error_log_fd= -1;
 #endif
 
-static void _set(memcached_st& memc, memcached_string_t *str, memcached_return_t &rc, const char *at, int local_errno= 0)
+static void _set(Memcached& memc, memcached_string_t *str, memcached_return_t &rc, const char *at, int local_errno= 0)
 {
   if (memc.error_messages && memc.error_messages->query_id != memc.query_id)
   {
     memcached_error_free(memc);
   }
 
-  // For memory allocation we use our error since it is a bit more specific
-  if (local_errno == ENOMEM and rc == MEMCACHED_ERRNO)
+  if (memcached_fatal(rc) or rc == MEMCACHED_CLIENT_ERROR)
   {
-    rc= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
-  }
-
-  if (rc == MEMCACHED_MEMORY_ALLOCATION_FAILURE)
-  {
-    local_errno= ENOMEM;
-  }
+    // For memory allocation we use our error since it is a bit more specific
+    if (local_errno == ENOMEM and rc == MEMCACHED_ERRNO)
+    {
+      rc= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
+    }
 
-  if (rc == MEMCACHED_ERRNO and not local_errno)
-  {
-    local_errno= errno;
-    rc= MEMCACHED_ERRNO;
-  }
+    if (rc == MEMCACHED_MEMORY_ALLOCATION_FAILURE)
+    {
+      local_errno= ENOMEM;
+    }
 
-  if (rc == MEMCACHED_ERRNO and local_errno == ENOTCONN)
-  {
-    rc= MEMCACHED_CONNECTION_FAILURE;
-  }
+    if (rc == MEMCACHED_ERRNO and not local_errno)
+    {
+      local_errno= errno;
+      rc= MEMCACHED_ERRNO;
+    }
 
-  if (local_errno == EINVAL)
-  {
-    rc= MEMCACHED_INVALID_ARGUMENTS;
-  }
+    if (rc == MEMCACHED_ERRNO and local_errno == ENOTCONN)
+    {
+      rc= MEMCACHED_CONNECTION_FAILURE;
+    }
 
-  if (local_errno == ECONNREFUSED)
-  {
-    rc= MEMCACHED_CONNECTION_FAILURE;
-  }
+    if (rc == MEMCACHED_ERRNO and local_errno == ECONNRESET)
+    {
+      rc= MEMCACHED_CONNECTION_FAILURE;
+    }
 
-  memcached_error_t *error= libmemcached_xmalloc(&memc, memcached_error_t);
-  if (error == NULL) // Bad business if this happens
-  {
-    return;
-  }
+    if (local_errno == EINVAL)
+    {
+      rc= MEMCACHED_INVALID_ARGUMENTS;
+    }
 
-  error->root= &memc;
-  error->query_id= memc.query_id;
-  error->rc= rc;
-  error->local_errno= local_errno;
+    if (local_errno == ECONNREFUSED)
+    {
+      rc= MEMCACHED_CONNECTION_FAILURE;
+    }
 
-  const char *errmsg_ptr;
-  char errmsg[MAX_ERROR_LENGTH];
-  errmsg[0]= 0;
-  errmsg_ptr= errmsg;
+    if (rc == MEMCACHED_TIMEOUT)
+    {
+    }
 
-  if (local_errno)
-  {
-#ifdef STRERROR_R_CHAR_P
-    errmsg_ptr= strerror_r(local_errno, errmsg, sizeof(errmsg));
-#else
-    strerror_r(local_errno, errmsg, sizeof(errmsg));
-    errmsg_ptr= errmsg;
-#endif
-  }
+    memcached_error_t *error= libmemcached_xmalloc(&memc, memcached_error_t);
+    if (error == NULL) // Bad business if this happens
+    {
+      assert_msg(error, "libmemcached_xmalloc() failed to allocate a memcached_error_t");
+      return;
+    }
 
+    error->root= &memc;
+    error->query_id= memc.query_id;
+    error->rc= rc;
+    error->local_errno= local_errno;
 
-  if (str and str->size and local_errno)
-  {
-    error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%lu) %s(%s), %.*s -> %s", 
-                               long(error->root),
-                               memcached_strerror(&memc, rc), 
-                               errmsg_ptr,
-                               memcached_string_printf(*str), at);
-  }
-  else if (local_errno)
-  {
-    error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%lu) %s(%s) -> %s", 
-                               long(error->root),
-                               memcached_strerror(&memc, rc), 
-                               errmsg_ptr,
-                               at);
-  }
-  else if (rc == MEMCACHED_PARSE_ERROR and str and str->size)
-  {
-    error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%lu) %.*s -> %s", 
-                               long(error->root),
-                               int(str->size), str->c_str, at);
-  }
-  else if (str and str->size)
-  {
-    error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%lu) %s, %.*s -> %s", 
-                               long(error->root),
-                               memcached_strerror(&memc, rc), 
-                               int(str->size), str->c_str, at);
-  }
-  else
-  {
-    error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%lu) %s -> %s", 
-                               long(error->root),
-                               memcached_strerror(&memc, rc), at);
-  }
+    // MEMCACHED_CLIENT_ERROR is a special case because it is an error coming from the server
+    if (rc == MEMCACHED_CLIENT_ERROR)
+    {
+      assert(str);
+      assert(str->size);
+      if (str and str->size)
+      {
+        assert(error->local_errno == 0);
+        error->local_errno= 0;
+
+        error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%p) %.*s", 
+                                   error->root,
+                                   int(str->size), str->c_str);
+      }
+    }
+    else if (local_errno)
+    {
+      const char *errmsg_ptr;
+      char errmsg[MAX_ERROR_LENGTH];
+      errmsg[0]= 0;
+      errmsg_ptr= errmsg;
+
+#if defined(STRERROR_R_CHAR_P) && STRERROR_R_CHAR_P
+      errmsg_ptr= strerror_r(local_errno, errmsg, sizeof(errmsg));
+#elif defined(HAVE_STRERROR_R) && HAVE_STRERROR_R
+      strerror_r(local_errno, errmsg, sizeof(errmsg));
+      errmsg_ptr= errmsg;
+#elif defined(HAVE_STRERROR) && HAVE_STRERROR
+      snprintf(errmsg, sizeof(errmsg), "%s", strerror(local_errno));
+      errmsg_ptr= errmsg;
+#endif
 
-  error->next= memc.error_messages;
-  memc.error_messages= error;
+      if (str and str->size and local_errno)
+      {
+        error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%p) %s(%s), %.*s -> %s", 
+                                   error->root,
+                                   memcached_strerror(&memc, rc), 
+                                   errmsg_ptr,
+                                   memcached_string_printf(*str), at);
+      }
+      else
+      {
+        error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%p) %s(%s) -> %s", 
+                                   error->root,
+                                   memcached_strerror(&memc, rc), 
+                                   errmsg_ptr,
+                                   at);
+      }
+    }
+    else if (rc == MEMCACHED_PARSE_ERROR and str and str->size)
+    {
+      error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%p) %.*s -> %s", 
+                                 error->root,
+                                 int(str->size), str->c_str, at);
+    }
+    else if (str and str->size)
+    {
+      error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%p) %s, %.*s -> %s", 
+                                 error->root,
+                                 memcached_strerror(&memc, rc), 
+                                 int(str->size), str->c_str, at);
+    }
+    else
+    {
+      error->size= (int)snprintf(error->message, MAX_ERROR_LENGTH, "(%p) %s -> %s", 
+                                 error->root,
+                                 memcached_strerror(&memc, rc), at);
+    }
 
+    error->next= memc.error_messages;
+    memc.error_messages= error;
 #if 0
-  if (error_log_fd == -1)
-  {
-//    unlink("/tmp/libmemcachd.log");
-    if ((error_log_fd= open("/tmp/libmemcachd.log", O_CREAT | O_WRONLY | O_APPEND, 0644)) < 0)
+    if (error_log_fd == -1)
     {
-      perror("open");
-      error_log_fd= -1;
+  //    unlink("/tmp/libmemcachd.log");
+      if ((error_log_fd= open("/tmp/libmemcachd.log", O_CREAT | O_WRONLY | O_APPEND, 0644)) < 0)
+      {
+        perror("open");
+        error_log_fd= -1;
+      }
     }
-  }
-  ::write(error_log_fd, error->message, error->size);
-  ::write(error_log_fd, "\n", 1);
+    ::write(error_log_fd, error->message, error->size);
+    ::write(error_log_fd, "\n", 1);
 #endif
+  }
 }
 
-memcached_return_t memcached_set_error(memcached_st& memc, memcached_return_t rc, const char *at, const char *str, size_t length)
+memcached_return_t memcached_set_error(Memcached& memc, memcached_return_t rc, const char *at, const char *str, size_t length)
 {
   assert_msg(rc != MEMCACHED_ERRNO, "Programmer error, MEMCACHED_ERRNO was set to be returned to client");
   memcached_string_t tmp= { str, length };
   return memcached_set_error(memc, rc, at, tmp);
 }
 
-memcached_return_t memcached_set_error(memcached_server_st& self, memcached_return_t rc, const char *at, const char *str, size_t length)
+memcached_return_t memcached_set_error(memcached_instance_st& self, memcached_return_t rc, const char *at, const char *str, size_t length)
 {
   assert_msg(rc != MEMCACHED_ERRNO, "Programmer error, MEMCACHED_ERRNO was set to be returned to client");
-  assert_msg(rc != MEMCACHED_SOME_ERRORS, "Programmer error, MEMCACHED_SOME_ERRORS was about to be set on a memcached_server_st");
+  assert_msg(rc != MEMCACHED_SOME_ERRORS, "Programmer error, MEMCACHED_SOME_ERRORS was about to be set on a Instance");
 
   memcached_string_t tmp= { str, length };
   return memcached_set_error(self, rc, at, tmp);
 }
 
-memcached_return_t memcached_set_error(memcached_st& memc, memcached_return_t rc, const char *at, memcached_string_t& str)
+#ifndef __INTEL_COMPILER
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
+#endif
+
+memcached_return_t memcached_set_error(Memcached& memc, memcached_return_t rc, const char *at, memcached_string_t& str)
 {
   assert_msg(rc != MEMCACHED_ERRNO, "Programmer error, MEMCACHED_ERRNO was set to be returned to client");
-  if (memcached_fatal(rc) == false)
+  if (memcached_fatal(rc))
   {
-    return rc;
+    _set(memc, &str, rc, at);
   }
 
-  _set(memc, &str, rc, at);
-
   return rc;
 }
 
-memcached_return_t memcached_set_parser_error(memcached_st& memc,
+memcached_return_t memcached_set_parser_error(Memcached& memc,
                                               const char *at,
                                               const char *format, ...)
 {
@@ -240,70 +277,85 @@ memcached_return_t memcached_set_parser_error(memcached_st& memc,
   return memcached_set_error(memc, MEMCACHED_PARSE_ERROR, at, buffer, length);
 }
 
-memcached_return_t memcached_set_error(memcached_server_st& self, memcached_return_t rc, const char *at, memcached_string_t& str)
+static inline size_t append_host_to_string(memcached_instance_st& self, char* buffer, const size_t buffer_length)
+{
+  size_t size= 0;
+  switch (self.type)
+  {
+  case MEMCACHED_CONNECTION_TCP:
+  case MEMCACHED_CONNECTION_UDP:
+    size+= snprintf(buffer, buffer_length, " host: %s:%d",
+                    self.hostname(), int(self.port()));
+    break;
+
+  case MEMCACHED_CONNECTION_UNIX_SOCKET:
+    size+= snprintf(buffer, buffer_length, " socket: %s",
+                    self.hostname());
+    break;
+  }
+
+  return size;
+}
+
+memcached_return_t memcached_set_error(memcached_instance_st& self, memcached_return_t rc, const char *at, memcached_string_t& str)
 {
   assert_msg(rc != MEMCACHED_ERRNO, "Programmer error, MEMCACHED_ERRNO was set to be returned to client");
-  assert_msg(rc != MEMCACHED_SOME_ERRORS, "Programmer error, MEMCACHED_SOME_ERRORS was about to be set on a memcached_server_st");
-  if (memcached_fatal(rc) == false)
+  assert_msg(rc != MEMCACHED_SOME_ERRORS, "Programmer error, MEMCACHED_SOME_ERRORS was about to be set on a memcached_instance_st");
+  if (memcached_fatal(rc) == false and rc != MEMCACHED_CLIENT_ERROR)
   {
     return rc;
   }
 
   char hostname_port_message[MAX_ERROR_LENGTH];
-  int size;
+  char* hostname_port_message_ptr= hostname_port_message;
+  int size= 0;
   if (str.size)
   {
-    size= snprintf(hostname_port_message, sizeof(hostname_port_message), "%.*s, host: %s:%d",
-                   memcached_string_printf(str),
-                   self.hostname, int(self.port));
-  }
-  else
-  {
-    size= snprintf(hostname_port_message, sizeof(hostname_port_message), "host: %s:%d",
-                   self.hostname, int(self.port));
+    size= snprintf(hostname_port_message_ptr, sizeof(hostname_port_message), "%.*s, ",
+                   memcached_string_printf(str));
+    hostname_port_message_ptr+= size;
   }
 
-  memcached_string_t error_host= { hostname_port_message, size };
+  size+= append_host_to_string(self, hostname_port_message_ptr, sizeof(hostname_port_message) -size);
 
-  assert(self.root);
-  if (self.root == NULL)
+  memcached_string_t error_host= { hostname_port_message, size_t(size) };
+
+  assert_msg(self.root, "Programmer error, root was not set on instance");
+  if (self.root)
   {
-    return rc;
+    _set(*self.root, &error_host, rc, at);
+    _set(self, (*self.root));
+    assert(self.error_messages);
+    assert(self.root->error_messages);
+    assert(self.error_messages->rc == self.root->error_messages->rc);
   }
 
-  _set(*self.root, &error_host, rc, at);
-  _set(self, (*self.root));
-  assert(self.root->error_messages);
-  assert(self.error_messages);
-
   return rc;
 }
 
-memcached_return_t memcached_set_error(memcached_server_st& self, memcached_return_t rc, const char *at)
+memcached_return_t memcached_set_error(memcached_instance_st& self, memcached_return_t rc, const char *at)
 {
-  assert_msg(rc != MEMCACHED_SOME_ERRORS, "Programmer error, MEMCACHED_SOME_ERRORS was about to be set on a memcached_server_st");
+  assert_msg(rc != MEMCACHED_SOME_ERRORS, "Programmer error, MEMCACHED_SOME_ERRORS was about to be set on a memcached_instance_st");
   if (memcached_fatal(rc) == false)
   {
     return rc;
   }
 
-  char hostname_port[NI_MAXHOST +NI_MAXSERV + sizeof("host : ")];
-  int size= snprintf(hostname_port, sizeof(hostname_port), "host: %s:%d", self.hostname, int(self.port));
+  char hostname_port[MEMCACHED_NI_MAXHOST +MEMCACHED_NI_MAXSERV + sizeof("host : ")];
+  size_t size= append_host_to_string(self, hostname_port, sizeof(hostname_port));
 
   memcached_string_t error_host= { hostname_port, size};
 
-  if (self.root == NULL)
+  if (self.root)
   {
-    return rc;
+    _set(*self.root, &error_host, rc, at);
+    _set(self, *self.root);
   }
 
-  _set(*self.root, &error_host, rc, at);
-  _set(self, *self.root);
-
   return rc;
 }
 
-memcached_return_t memcached_set_error(memcached_st& self, memcached_return_t rc, const char *at)
+memcached_return_t memcached_set_error(Memcached& self, memcached_return_t rc, const char *at)
 {
   assert_msg(rc != MEMCACHED_ERRNO, "Programmer error, MEMCACHED_ERRNO was set to be returned to client");
   if (memcached_fatal(rc) == false)
@@ -316,19 +368,19 @@ memcached_return_t memcached_set_error(memcached_st& self, memcached_return_t rc
   return rc;
 }
 
-memcached_return_t memcached_set_errno(memcached_st& self, int local_errno, const char *at, const char *str, size_t length)
+memcached_return_t memcached_set_errno(Memcached& self, int local_errno, const char *at, const char *str, size_t length)
 {
   memcached_string_t tmp= { str, length };
   return memcached_set_errno(self, local_errno, at, tmp);
 }
 
-memcached_return_t memcached_set_errno(memcached_server_st& self, int local_errno, const char *at, const char *str, size_t length)
+memcached_return_t memcached_set_errno(memcached_instance_st& self, int local_errno, const char *at, const char *str, size_t length)
 {
   memcached_string_t tmp= { str, length };
   return memcached_set_errno(self, local_errno, at, tmp);
 }
 
-memcached_return_t memcached_set_errno(memcached_st& self, int local_errno, const char *at)
+memcached_return_t memcached_set_errno(Memcached& self, int local_errno, const char *at)
 {
   if (local_errno == 0)
   {
@@ -341,7 +393,7 @@ memcached_return_t memcached_set_errno(memcached_st& self, int local_errno, cons
   return rc;
 }
 
-memcached_return_t memcached_set_errno(memcached_st& memc, int local_errno, const char *at, memcached_string_t& str)
+memcached_return_t memcached_set_errno(Memcached& memc, int local_errno, const char *at, memcached_string_t& str)
 {
   if (local_errno == 0)
   {
@@ -354,7 +406,7 @@ memcached_return_t memcached_set_errno(memcached_st& memc, int local_errno, cons
   return rc;
 }
 
-memcached_return_t memcached_set_errno(memcached_server_st& self, int local_errno, const char *at, memcached_string_t& str)
+memcached_return_t memcached_set_errno(memcached_instance_st& self, int local_errno, const char *at, memcached_string_t& str)
 {
   if (local_errno == 0)
   {
@@ -362,18 +414,13 @@ memcached_return_t memcached_set_errno(memcached_server_st& self, int local_errn
   }
 
   char hostname_port_message[MAX_ERROR_LENGTH];
-  int size;
+  char* hostname_port_message_ptr= hostname_port_message;
+  size_t size= 0;
   if (str.size)
   {
-    size= snprintf(hostname_port_message, sizeof(hostname_port_message), "%.*s, host: %s:%d",
-                   memcached_string_printf(str),
-                   self.hostname, int(self.port));
-  }
-  else
-  {
-    size= snprintf(hostname_port_message, sizeof(hostname_port_message), "host: %s:%d",
-                   self.hostname, int(self.port));
+    size= snprintf(hostname_port_message_ptr, sizeof(hostname_port_message), "%.*s, ", memcached_string_printf(str));
   }
+  size+= append_host_to_string(self, hostname_port_message_ptr, sizeof(hostname_port_message) -size);
 
   memcached_string_t error_host= { hostname_port_message, size };
 
@@ -386,10 +433,19 @@ memcached_return_t memcached_set_errno(memcached_server_st& self, int local_errn
   _set(*self.root, &error_host, rc, at, local_errno);
   _set(self, (*self.root));
 
+#if 0
+  if (self.root->error_messages->rc != self.error_messages->rc)
+  {
+    fprintf(stderr, "%s:%d %s != %s\n", __FILE__, __LINE__,
+            memcached_strerror(NULL, self.root->error_messages->rc),
+            memcached_strerror(NULL, self.error_messages->rc));
+  }
+#endif
+
   return rc;
 }
 
-memcached_return_t memcached_set_errno(memcached_server_st& self, int local_errno, const char *at)
+memcached_return_t memcached_set_errno(memcached_instance_st& self, int local_errno, const char *at)
 {
   if (local_errno == 0)
   {
@@ -397,8 +453,7 @@ memcached_return_t memcached_set_errno(memcached_server_st& self, int local_errn
   }
 
   char hostname_port_message[MAX_ERROR_LENGTH];
-  int size = snprintf(hostname_port_message, sizeof(hostname_port_message), "host: %s:%d",
-                      self.hostname, int(self.port));
+  size_t size= append_host_to_string(self, hostname_port_message, sizeof(hostname_port_message));
 
   memcached_string_t error_host= { hostname_port_message, size };
 
@@ -433,8 +488,9 @@ static void _error_print(const memcached_error_t *error)
   _error_print(error->next);
 }
 
-void memcached_error_print(const memcached_st *self)
+void memcached_error_print(const Memcached *shell)
 {
+  const Memcached* self= memcached2Memcached(shell);
   if (self == NULL)
   {
     return;
@@ -444,7 +500,7 @@ void memcached_error_print(const memcached_st *self)
 
   for (uint32_t x= 0; x < memcached_server_count(self); x++)
   {
-    memcached_server_instance_st instance= memcached_server_instance_by_position(self, x);
+    memcached_instance_st* instance= memcached_instance_by_position(self, x);
 
     _error_print(instance->error_messages);
   }
@@ -452,24 +508,21 @@ void memcached_error_print(const memcached_st *self)
 
 static void _error_free(memcached_error_t *error)
 {
-  if (not error)
+  if (error)
   {
-    return;
-  }
+    _error_free(error->next);
 
-  _error_free(error->next);
-
-  if (error and error->root)
-  {
-    libmemcached_free(error->root, error);
-  }
-  else if (error)
-  {
     libmemcached_free(error->root, error);
   }
 }
 
-void memcached_error_free(memcached_st& self)
+void memcached_error_free(Memcached& self)
+{
+  _error_free(self.error_messages);
+  self.error_messages= NULL;
+}
+
+void memcached_error_free(memcached_instance_st& self)
 {
   _error_free(self.error_messages);
   self.error_messages= NULL;
@@ -481,27 +534,33 @@ void memcached_error_free(memcached_server_st& self)
   self.error_messages= NULL;
 }
 
-const char *memcached_last_error_message(memcached_st *memc)
+const char *memcached_error(const memcached_st *memc)
 {
-  if (memc == NULL)
-  {
-    return memcached_strerror(memc, MEMCACHED_INVALID_ARGUMENTS);
-  }
+  return memcached_last_error_message(memc);
+}
 
-  if (memc->error_messages == NULL)
+const char *memcached_last_error_message(const memcached_st *shell)
+{
+  const Memcached* memc= memcached2Memcached(shell);
+  if (memc)
   {
-    return memcached_strerror(memc, MEMCACHED_SUCCESS);
-  }
+    if (memc->error_messages)
+    {
+      if (memc->error_messages->size and memc->error_messages->message[0])
+      {
+        return memc->error_messages->message;
+      }
 
-  if (memc->error_messages->size == 0)
-  {
-    return memcached_strerror(memc, memc->error_messages->rc);
+      return memcached_strerror(memc, memc->error_messages->rc);
+    }
+
+    return memcached_strerror(memc, MEMCACHED_SUCCESS);
   }
 
-  return memc->error_messages->message;
+  return memcached_strerror(memc, MEMCACHED_INVALID_ARGUMENTS);
 }
 
-bool memcached_has_current_error(memcached_st &memc)
+bool memcached_has_current_error(Memcached &memc)
 {
   if (memc.error_messages 
       and memc.error_messages->query_id == memc.query_id
@@ -513,28 +572,30 @@ bool memcached_has_current_error(memcached_st &memc)
   return false;
 }
 
-bool memcached_has_current_error(memcached_server_st& server)
+bool memcached_has_current_error(memcached_instance_st& server)
 {
   return memcached_has_current_error(*(server.root));
 }
 
-memcached_return_t memcached_last_error(memcached_st *memc)
+memcached_return_t memcached_last_error(const memcached_st *shell)
 {
-  if (memc == NULL)
+  const Memcached* memc= memcached2Memcached(shell);
+  if (memc)
   {
-    return MEMCACHED_INVALID_ARGUMENTS;
-  }
+    if (memc->error_messages)
+    {
+      return memc->error_messages->rc;
+    }
 
-  if (memc->error_messages == NULL)
-  {
     return MEMCACHED_SUCCESS;
   }
 
-  return memc->error_messages->rc;
+  return MEMCACHED_INVALID_ARGUMENTS;
 }
 
-int memcached_last_error_errno(memcached_st *memc)
+int memcached_last_error_errno(const memcached_st *shell)
 {
+  const Memcached* memc= memcached2Memcached(shell);
   if (memc == NULL)
   {
     return 0;
@@ -548,7 +609,7 @@ int memcached_last_error_errno(memcached_st *memc)
   return memc->error_messages->local_errno;
 }
 
-const char *memcached_server_error(memcached_server_instance_st server)
+const char *memcached_server_error(const memcached_instance_st * server)
 {
   if (server == NULL)
   {
@@ -569,7 +630,7 @@ const char *memcached_server_error(memcached_server_instance_st server)
 }
 
 
-memcached_error_t *memcached_error_copy(const memcached_server_st& server)
+memcached_error_t *memcached_error_copy(const memcached_instance_st& server)
 {
   if (server.error_messages == NULL)
   {
@@ -583,17 +644,32 @@ memcached_error_t *memcached_error_copy(const memcached_server_st& server)
   return error;
 }
 
-memcached_return_t memcached_server_error_return(memcached_server_instance_st ptr)
+memcached_return_t memcached_server_error_return(const memcached_instance_st * ptr)
 {
   if (ptr == NULL)
   {
     return MEMCACHED_INVALID_ARGUMENTS;
   }
 
-  if (ptr and ptr->error_messages)
+  if (ptr->error_messages)
   {
     return ptr->error_messages->rc;
   }
 
   return MEMCACHED_SUCCESS;
 }
+
+memcached_return_t memcached_instance_error_return(memcached_instance_st* instance)
+{
+  if (instance == NULL)
+  {
+    return MEMCACHED_INVALID_ARGUMENTS;
+  }
+
+  if (instance->error_messages)
+  {
+    return instance->error_messages->rc;
+  }
+
+  return MEMCACHED_SUCCESS;
+}