X-Git-Url: https://git.m6w6.name/?a=blobdiff_plain;f=libmemcached%2Fdump.cc;h=05b4e5d6c8cf4b81fd50d6dcf5725dc5aa7c511f;hb=b5a4a113c48e7899223de67cfe043b886a1736ac;hp=dcbe15b81c5104448b811880582215bf73fdb412;hpb=956d15b5b1f3f3518eb374a3a9e0393e9dacd3b6;p=m6w6%2Flibmemcached diff --git a/libmemcached/dump.cc b/libmemcached/dump.cc index dcbe15b8..05b4e5d6 100644 --- a/libmemcached/dump.cc +++ b/libmemcached/dump.cc @@ -1,3 +1,39 @@ +/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab: + * + * Libmemcached library + * + * Copyright (C) 2011 Data Differential, http://datadifferential.com/ + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * + * * The names of its contributors may not be used to endorse or + * promote products derived from this software without specific prior + * written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + /* We use this to dump all keys. @@ -8,101 +44,102 @@ #include -static memcached_return_t ascii_dump(memcached_st *ptr, memcached_dump_fn *callback, void *context, uint32_t number_of_callbacks) +static memcached_return_t ascii_dump(memcached_st *memc, memcached_dump_fn *callback, void *context, uint32_t number_of_callbacks) { - memcached_return_t rc= MEMCACHED_SUCCESS; - - for (uint32_t server_key= 0; server_key < memcached_server_count(ptr); server_key++) + /* MAX_NUMBER_OF_SLAB_CLASSES is defined to 200 in Memcached 1.4.10 */ + for (uint32_t x= 0; x < 200; x++) { - memcached_server_write_instance_st instance; - instance= memcached_server_instance_fetch(ptr, server_key); + char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE]; + int buffer_length= snprintf(buffer, sizeof(buffer), "%u", x); + if (size_t(buffer_length) >= sizeof(buffer) or buffer_length < 0) + { + return memcached_set_error(*memc, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT, + memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)")); + } + + // @NOTE the hard coded zero means "no limit" + libmemcached_io_vector_st vector[]= + { + { memcached_literal_param("stats cachedump ") }, + { buffer, size_t(buffer_length) }, + { memcached_literal_param(" 0\r\n") } + }; - /* 256 I BELIEVE is the upper limit of slabs */ - for (uint32_t x= 0; x < 256; x++) + // Send message to all servers + for (uint32_t server_key= 0; server_key < memcached_server_count(memc); server_key++) { - char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE]; - int send_length; - send_length= snprintf(buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, - "stats cachedump %u 0 0\r\n", x); + memcached_server_write_instance_st instance= memcached_server_instance_fetch(memc, server_key); - if (send_length >= MEMCACHED_DEFAULT_COMMAND_SIZE || send_length < 0) + memcached_return_t vdo_rc; + if (memcached_success((vdo_rc= memcached_vdo(instance, vector, 3, true)))) { - return memcached_set_error(*ptr, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT, - memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)")); + // We have sent the message to the server successfully } - - rc= memcached_do(instance, buffer, (size_t)send_length, true); - - if (rc != MEMCACHED_SUCCESS) + else { - goto error; + return vdo_rc; } + } - while (1) + // Collect the returned items + memcached_server_write_instance_st instance; + while ((instance= memcached_io_get_readable_server(memc))) + { + memcached_return_t response_rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL); + if (response_rc == MEMCACHED_ITEM) { - uint32_t callback_counter; - rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL); + char *string_ptr, *end_ptr; - if (rc == MEMCACHED_ITEM) - { - char *string_ptr, *end_ptr; - - string_ptr= buffer; - string_ptr+= 5; /* Move past ITEM */ + string_ptr= buffer; + string_ptr+= 5; /* Move past ITEM */ - for (end_ptr= string_ptr; isgraph(*end_ptr); end_ptr++) {} ; + for (end_ptr= string_ptr; isgraph(*end_ptr); end_ptr++) {} ; - char *key= string_ptr; - key[(size_t)(end_ptr-string_ptr)]= 0; + char *key= string_ptr; + key[(size_t)(end_ptr-string_ptr)]= 0; - for (callback_counter= 0; callback_counter < number_of_callbacks; callback_counter++) + for (uint32_t callback_counter= 0; callback_counter < number_of_callbacks; callback_counter++) + { + memcached_return_t callback_rc= (*callback[callback_counter])(memc, key, (size_t)(end_ptr-string_ptr), context); + if (callback_rc != MEMCACHED_SUCCESS) { - rc= (*callback[callback_counter])(ptr, key, (size_t)(end_ptr-string_ptr), context); - if (rc != MEMCACHED_SUCCESS) - { - break; - } + // @todo build up a message for the error from the value + memcached_set_error(*instance, callback_rc, MEMCACHED_AT); + break; } } - else if (rc == MEMCACHED_END) - { - break; - } - else if (rc == MEMCACHED_SERVER_ERROR or rc == MEMCACHED_CLIENT_ERROR) - { - /* If we try to request stats cachedump for a slab class that is too big - * the server will return an incorrect error message: - * "MEMCACHED_SERVER_ERROR failed to allocate memory" - * This isn't really a fatal error, so let's just skip it. I want to - * fix the return value from the memcached server to a CLIENT_ERROR, - * so let's add support for that as well right now. - */ - rc= MEMCACHED_END; - break; - } - else - { - goto error; - } + } + else if (response_rc == MEMCACHED_END) + { + // All items have been returned + } + else if (response_rc == MEMCACHED_SERVER_ERROR or response_rc == MEMCACHED_CLIENT_ERROR or response_rc == MEMCACHED_ERROR) + { + /* If we try to request stats cachedump for a slab class that is too big + * the server will return an incorrect error message: + * "MEMCACHED_SERVER_ERROR failed to allocate memory" + * This isn't really a fatal error, so let's just skip it. I want to + * fix the return value from the memcached server to a CLIENT_ERROR, + * so let's add support for that as well right now. + */ + assert(response_rc == MEMCACHED_SUCCESS); // Just fail + return response_rc; + } + else + { + // IO error of some sort must have occurred + return response_rc; } } } -error: - if (rc == MEMCACHED_END) - { - return MEMCACHED_SUCCESS; - } - else - { - return rc; - } + return memcached_has_current_error(*memc) ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS; } memcached_return_t memcached_dump(memcached_st *ptr, memcached_dump_fn *callback, void *context, uint32_t number_of_callbacks) { memcached_return_t rc; - if ((rc= initialize_query(ptr)) != MEMCACHED_SUCCESS) + if (memcached_failed(rc= initialize_query(ptr, true))) { return rc; } @@ -111,9 +148,9 @@ memcached_return_t memcached_dump(memcached_st *ptr, memcached_dump_fn *callback No support for Binary protocol yet @todo Fix this so that we just flush, switch to ascii, and then go back to binary. */ - if (ptr->flags.binary_protocol) + if (memcached_is_binary(ptr)) { - return MEMCACHED_FAILURE; + return memcached_set_error(*ptr, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT, memcached_literal_param("Binary protocol is not supported for memcached_dump()")); } return ascii_dump(ptr, callback, context, number_of_callbacks);