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Derick Rethans derickr
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/**
* Copyright 2009-2014 MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef PHP_MONGO_H
#define PHP_MONGO_H 1

#define PHP_MONGO_VERSION "1.6.0-dev"
#define PHP_MONGO_EXTNAME "mongo"

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#if defined(_MSC_VER)
# define strtoll(s, f, b) _atoi64(s)
#elif !defined(HAVE_STRTOLL)
# if defined(HAVE_ATOLL)
# define strtoll(s, f, b) atoll(s)
# else
# define strtoll(s, f, b) strtol(s, f, b)
# endif
#endif


#include "mcon/types.h"
#include "mcon/read_preference.h"

#ifndef zend_parse_parameters_none
# define zend_parse_parameters_none() \
zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "")
#endif

#ifndef Z_UNSET_ISREF_P
# define Z_UNSET_ISREF_P(pz) pz->is_ref = 0
#endif

#if PHP_VERSION_ID < 50300
# define MAKE_COPY_ZVAL(ppzv, pzv) \
*(pzv) = **(ppzv); \
zval_copy_ctor((pzv)); \
INIT_PZVAL((pzv));
#endif

#ifdef WIN32
# ifndef int64_t
typedef __int64 int64_t;
# endif
#endif

#ifndef Z_ADDREF_P
# define Z_ADDREF_P(pz) (pz)->refcount++
#endif

#ifndef Z_ADDREF_PP
# define Z_ADDREF_PP(ppz) Z_ADDREF_P(*(ppz))
#endif

#ifndef Z_DELREF_P
# define Z_DELREF_P(pz) (pz)->refcount--
#endif

#ifndef Z_SET_REFCOUNT_P
# define Z_SET_REFCOUNT_P(pz, rc) (pz)->refcount = (rc)
#endif

#define INT_32 4
#define INT_64 8
#define DOUBLE_64 8
#define BYTE_8 1

/* db ops */
#define OP_REPLY 1
#define OP_MSG 1000
#define OP_UPDATE 2001
#define OP_INSERT 2002
#define OP_GET_BY_OID 2003
#define OP_QUERY 2004
#define OP_GET_MORE 2005
#define OP_DELETE 2006
#define OP_KILL_CURSORS 2007

#define REPLY_HEADER_SIZE 36

#define INITIAL_BUF_SIZE 4096
#define DEFAULT_CHUNK_SIZE (255*1024)
#define DEFAULT_CHUNK_SIZE_S "261120"

#define PHP_MONGO_DEFAULT_WTIMEOUT 10000
#define PHP_MONGO_STATIC_CURSOR_TIMEOUT_NOT_SET_INITIALIZER -2

/* if _id field should be added */
#define PREP 1
#define NO_PREP 0

#define NOISY 0
#define QUIET 1

/* duplicate strings */
#define DUP 1
#define NO_DUP 0

#define LAST_ERROR 0
#define PREV_ERROR 1
#define RESET_ERROR 2
#define FORCE_ERROR 3

#if PHP_VERSION_ID > 50300
# define MONGO_ARGINFO_STATIC
#else
# define MONGO_ARGINFO_STATIC static
#endif

#if PHP_VERSION_ID >= 50300
# define PUSH_PARAM(arg) zend_vm_stack_push(arg TSRMLS_CC)
# define POP_PARAM() (void)zend_vm_stack_pop(TSRMLS_C)
# define PUSH_EO_PARAM()
# define POP_EO_PARAM()
#else
# define PUSH_PARAM(arg) zend_ptr_stack_push(&EG(argument_stack), arg)
# define POP_PARAM() (void)zend_ptr_stack_pop(&EG(argument_stack))
# define PUSH_EO_PARAM() zend_ptr_stack_push(&EG(argument_stack), NULL)
# define POP_EO_PARAM() (void)zend_ptr_stack_pop(&EG(argument_stack))
#endif

#if PHP_VERSION_ID >= 50300
# define MONGO_E_DEPRECATED E_DEPRECATED
#else
# define MONGO_E_DEPRECATED E_STRICT
#endif
#if PHP_VERSION_ID < 50307
# define PHP_FE_END { NULL, NULL, NULL, 0, 0 }
#endif

#if PHP_VERSION_ID > 50300
# define ERROR_HANDLER_DECLARATION(varname) zend_error_handling varname;
# define ERROR_HANDLER_REPLACE(varname, ex) zend_replace_error_handling(EH_THROW, ex, &varname TSRMLS_CC)
# define ERROR_HANDLER_RESTORE(varname) zend_restore_error_handling(&varname TSRMLS_CC)
#else
# define ERROR_HANDLER_DECLARATION(varname)
# define ERROR_HANDLER_REPLACE(varname, ex) php_set_error_handling(EH_THROW, ex TSRMLS_CC)
# define ERROR_HANDLER_RESTORE(varname) php_set_error_handling(EH_NORMAL, NULL TSRMLS_CC)
#endif

#define MUST_BE_ARRAY_OR_OBJECT(num, arg) do { \
if (arg && !(Z_TYPE_P(arg) == IS_ARRAY || Z_TYPE_P(arg) == IS_OBJECT)) { \
php_error_docref(NULL TSRMLS_CC, E_WARNING, "expects parameter %d to be an array or object, %s given", num, zend_get_type_by_const(Z_TYPE_P(arg))); \
RETURN_NULL(); \
} \
} while(0);

#if PHP_VERSION_ID < 50300
#define zpp_var_args(argv, argc) do { \
if (ZEND_NUM_ARGS() < 1) { \
WRONG_PARAM_COUNT; \
} \
argv = (zval ***)safe_emalloc(ZEND_NUM_ARGS(), sizeof(zval **), 0); \
if (zend_get_parameters_array_ex(ZEND_NUM_ARGS(), argv) == FAILURE) { \
efree(argv); \
WRONG_PARAM_COUNT; \
} \
argc = ZEND_NUM_ARGS(); \
} while(0);
#else
#define zpp_var_args(argv, argc) do { \
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "+", &argv, &argc) == FAILURE) { \
return; \
} \
} while(0);
#endif

#define MONGO_METHOD_BASE(classname, name) zim_##classname##_##name

#define MONGO_METHOD_HELPER(classname, name, retval, thisptr, num, param) \
PUSH_PARAM(param); PUSH_PARAM((void*)num); \
PUSH_EO_PARAM(); \
MONGO_METHOD_BASE(classname, name)(num, retval, NULL, thisptr, 0 TSRMLS_CC); \
POP_EO_PARAM(); \
POP_PARAM(); POP_PARAM();

/* push parameters, call function, pop parameters */
#define MONGO_METHOD(classname, name, retval, thisptr) \
MONGO_METHOD_BASE(classname, name)(0, retval, NULL, thisptr, 0 TSRMLS_CC);

#define MONGO_METHOD1(classname, name, retval, thisptr, param1) \
MONGO_METHOD_HELPER(classname, name, retval, thisptr, 1, param1);

#define MONGO_METHOD2(classname, name, retval, thisptr, param1, param2) \
PUSH_PARAM(param1); \
MONGO_METHOD_HELPER(classname, name, retval, thisptr, 2, param2); \
POP_PARAM();

#define MONGO_METHOD3(classname, name, retval, thisptr, param1, param2, param3) \
PUSH_PARAM(param1); PUSH_PARAM(param2); \
MONGO_METHOD_HELPER(classname, name, retval, thisptr, 3, param3); \
POP_PARAM(); POP_PARAM();

#define MONGO_METHOD4(classname, name, retval, thisptr, param1, param2, param3, param4) \
PUSH_PARAM(param1); PUSH_PARAM(param2); PUSH_PARAM(param3); \
MONGO_METHOD_HELPER(classname, name, retval, thisptr, 4, param4); \
POP_PARAM(); POP_PARAM(); POP_PARAM();

#define MONGO_METHOD5(classname, name, retval, thisptr, param1, param2, param3, param4, param5) \
PUSH_PARAM(param1); PUSH_PARAM(param2); PUSH_PARAM(param3); PUSH_PARAM(param4); \
MONGO_METHOD_HELPER(classname, name, retval, thisptr, 5, param5); \
POP_PARAM(); POP_PARAM(); POP_PARAM(); POP_PARAM();

#define HASH_P(a) (Z_TYPE_P(a) == IS_ARRAY ? Z_ARRVAL_P(a) : Z_OBJPROP_P(a))
#define HASH_PP(a) (Z_TYPE_PP(a) == IS_ARRAY ? Z_ARRVAL_PP(a) : Z_OBJPROP_PP(a))

#define IS_SCALAR_P(a) (Z_TYPE_P(a) == IS_NULL || Z_TYPE_P(a) == IS_LONG || Z_TYPE_P(a) == IS_DOUBLE || Z_TYPE_P(a) == IS_BOOL || Z_TYPE_P(a) == IS_STRING)
#define IS_SCALAR_PP(a) IS_SCALAR_P(*a)
#define IS_ARRAY_OR_OBJECT_P(a) (Z_TYPE_P(a) == IS_ARRAY || Z_TYPE_P(a) == IS_OBJECT)

#if PHP_VERSION_ID >= 50400
# define init_properties(intern) object_properties_init(&intern->std, class_type)
#else
# define init_properties(intern) { \
zval *tmp; \
zend_hash_copy(intern->std.properties, &class_type->default_properties, (copy_ctor_func_t) zval_add_ref, (void *) &tmp, sizeof(zval *)); \
}
#endif

#define PHP_MONGO_TYPE_OBJ_NEW(mongo_obj) \
zend_object_value retval; \
mongo_obj *intern; \
\
intern = (mongo_obj*)emalloc(sizeof(mongo_obj)); \
memset(intern, 0, sizeof(mongo_obj)); \
\
zend_object_std_init(&intern->std, class_type TSRMLS_CC); \
init_properties(intern); \
\
retval.handle = zend_objects_store_put(intern,(zend_objects_store_dtor_t) zend_objects_destroy_object, php_##mongo_obj##_free, NULL TSRMLS_CC); \
retval.handlers = &mongo_type_object_handlers; \
\
return retval;

#define PHP_MONGO_OBJ_NEW(mongo_obj) \
zend_object_value retval; \
mongo_obj *intern; \
\
intern = (mongo_obj*)emalloc(sizeof(mongo_obj)); \
memset(intern, 0, sizeof(mongo_obj)); \
\
zend_object_std_init(&intern->std, class_type TSRMLS_CC); \
init_properties(intern); \
\
retval.handle = zend_objects_store_put(intern,(zend_objects_store_dtor_t) zend_objects_destroy_object, php_##mongo_obj##_free, NULL TSRMLS_CC); \
retval.handlers = &mongo_default_handlers; \
\
return retval;

zend_object_value php_mongo_type_object_new(zend_class_entry *class_type TSRMLS_DC);
void php_mongo_type_object_free(void *object TSRMLS_DC);

#if PHP_VERSION_ID >= 50400
void mongo_write_property(zval *object, zval *member, zval *value, const zend_literal *key TSRMLS_DC);
#else
void mongo_write_property(zval *object, zval *member, zval *value TSRMLS_DC);
#endif

#if PHP_VERSION_ID >= 50400
zval *mongo_read_property(zval *object, zval *member, int type, const zend_literal *key TSRMLS_DC);
#else
zval *mongo_read_property(zval *object, zval *member, int type TSRMLS_DC);
#endif


/* Used in our _write_property() handler to mark properties are userland Read Only */
#define MONGO_ACC_READ_ONLY 0x10000000

typedef struct {
zend_object std;
} mongo_type_object;

typedef struct {
zend_object std;

mongo_con_manager *manager; /* Contains a link to the manager */
mongo_servers *servers;
} mongoclient;

typedef struct {
int length;
int request_id;
int response_to;
int op;
} mongo_msg_header;

typedef struct {
char *start;
char *pos;
char *end;
} mongo_buffer;

#define CREATE_MSG_HEADER(rid, rto, opcode) \
header.length = 0; \
header.request_id = rid; \
header.response_to = rto; \
header.op = opcode;

#define CREATE_RESPONSE_HEADER(buf, ns, rto, opcode) \
CREATE_MSG_HEADER(MonGlo(request_id)++, rto, opcode); \
APPEND_HEADER_NS(buf, ns, 0);

#define CREATE_HEADER_WITH_OPTS(buf, ns, opcode, opts) \
CREATE_MSG_HEADER(MonGlo(request_id)++, 0, opcode); \
APPEND_HEADER_NS(buf, ns, opts);

#define CREATE_HEADER(buf, ns, opcode) \
CREATE_RESPONSE_HEADER(buf, ns, 0, opcode);

#define APPEND_HEADER(buf, opts) buf->pos += INT_32; \
php_mongo_serialize_int(buf, header.request_id); \
php_mongo_serialize_int(buf, header.response_to); \
php_mongo_serialize_int(buf, header.op); \
php_mongo_serialize_int(buf, opts);


#define APPEND_HEADER_NS(buf, ns, opts) \
APPEND_HEADER(buf, opts); \
php_mongo_serialize_ns(buf, ns TSRMLS_CC);


#define MONGO_CHECK_INITIALIZED(member, class_name) \
if (!(member)) { \
zend_throw_exception(mongo_ce_Exception, "The " #class_name " object has not been correctly initialized by its constructor", 0 TSRMLS_CC); \
RETURN_FALSE; \
}

#define MONGO_CHECK_INITIALIZED_STRING(member, class_name) \
if (!(member)) { \
zend_throw_exception(mongo_ce_Exception, "The " #class_name " object has not been correctly initialized by its constructor", 0 TSRMLS_CC); \
RETURN_STRING("", 1); \
}

#define PHP_MONGO_GET_LINK(obj) \
link = (mongoclient*)zend_object_store_get_object((obj) TSRMLS_CC); \
MONGO_CHECK_INITIALIZED(link->servers, Mongo);

#define PHP_MONGO_GET_DB(obj) \
db = (mongo_db*)zend_object_store_get_object((obj) TSRMLS_CC); \
MONGO_CHECK_INITIALIZED(db->name, MongoDB);

#define PHP_MONGO_GET_COLLECTION(obj) \
c = (mongo_collection*)zend_object_store_get_object((obj) TSRMLS_CC); \
MONGO_CHECK_INITIALIZED(c->ns, MongoCollection);

#define PHP_MONGO_GET_CURSOR(obj) \
cursor = (mongo_cursor*)zend_object_store_get_object((obj) TSRMLS_CC); \
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);

#define PHP_MONGO_GET_MONGOCLIENT_FROM_CURSOR(cursor) \
client = (mongoclient*)zend_object_store_get_object((cursor)->zmongoclient TSRMLS_CC);

#define PHP_MONGO_CHECK_EXCEPTION() if (EG(exception)) { return; }

#define PHP_MONGO_CHECK_EXCEPTION1(arg1) \
if (EG(exception)) { \
if (*arg1) { zval_ptr_dtor(arg1); } \
return; \
}

#define PHP_MONGO_CHECK_EXCEPTION2(arg1, arg2) \
if (EG(exception)) { \
if (*arg1) { zval_ptr_dtor(arg1); } \
if (*arg2) { zval_ptr_dtor(arg2); } \
return; \
}

#define PHP_MONGO_CHECK_EXCEPTION3(arg1, arg2, arg3) \
if (EG(exception)) { \
if (*arg1) { zval_ptr_dtor(arg1); } \
if (*arg2) { zval_ptr_dtor(arg2); } \
if (*arg3) { zval_ptr_dtor(arg3); } \
return; \
}

#define PHP_MONGO_CHECK_EXCEPTION4(arg1, arg2, arg3, arg4) \
if (EG(exception)) { \
if (*arg1) { zval_ptr_dtor(arg1); } \
if (*arg2) { zval_ptr_dtor(arg2); } \
if (*arg3) { zval_ptr_dtor(arg3); } \
if (*arg4) { zval_ptr_dtor(arg4); } \
return; \
}

#define PHP_MONGO_SERIALIZE_KEY(type) \
php_mongo_set_type(buf, type); \
php_mongo_serialize_key(buf, name, name_len, prep TSRMLS_CC); \
if (EG(exception)) { \
return ZEND_HASH_APPLY_STOP; \
}


#define REPLY_HEADER_LEN 36

typedef struct {
zend_object std;

/* Connection */
mongo_connection *connection;
zval *zmongoclient;

/* collection namespace */
char *ns;

/* fields to send */
zval *query;
zval *fields;
int limit;
int batch_size;
int skip;
int opts;

char special;
int timeout;

mongo_msg_header send;
mongo_msg_header recv;

/* response fields */
int flag;
int start;
/* number of results used */
int at;
/* number results returned */
int num;
/* results */
mongo_buffer buf;

/* cursor_id indicates if there are more results to fetch. If cursor_id
* is 0, the cursor is "dead." If cursor_id != 0, server is set to the
* server that was queried, so a get_more doesn't try to fetch results
* from the wrong server. server just points to a member of link, so it
* should never need to be freed. */
int64_t cursor_id;

zend_bool started_iterating;
zend_bool pre_created; /* Used for command cursors through createFromDocument */
zend_bool persist;

zval *current;
int retry;

mongo_read_preference read_pref;

int dead;

/* Options that deal with changes to what the cursor documents return. For
* example forcing longs to be returned as objects */
int cursor_options;

/* Fields that are only used for command cursors */
zval *first_batch; /* The first batch of results */
int first_batch_at; /* The current cursor position in the first batch */
int first_batch_num; /* The number of entries in the first batch */
} mongo_cursor;

typedef mongo_cursor mongo_command_cursor;

typedef struct {
zend_object std;
char *id;
} mongo_id;


typedef struct {
zend_object std;
zval *link;
zval *name;

mongo_read_preference read_pref;
} mongo_db;

typedef struct {
zend_object std;

/* parent database */
zval *parent;
zval *link;

/* names */
zval *name;
zval *ns;

mongo_read_preference read_pref;
} mongo_collection;

#include "api/write.h"

typedef struct {
zend_object std;
php_mongo_write_types batch_type;
zval *zcollection_object;
php_mongo_batch *batch;
php_mongo_write_options write_options;
int total_items;
} mongo_write_batch_object;


#define BUF_REMAINING (buf->end-buf->pos)

#define CREATE_BUF(buf, size) \
buf.start = (char*)emalloc(size); \
buf.pos = buf.start; \
buf.end = buf.start + size;

PHP_MINIT_FUNCTION(mongo);
PHP_MSHUTDOWN_FUNCTION(mongo);
PHP_RINIT_FUNCTION(mongo);
PHP_MINFO_FUNCTION(mongo);

/* Serialization functions */
PHP_FUNCTION(bson_encode);
PHP_FUNCTION(bson_decode);


void mongo_init_MongoDB(TSRMLS_D);
void mongo_init_MongoCollection(TSRMLS_D);

void mongo_init_MongoGridFS(TSRMLS_D);
void mongo_init_MongoGridFSFile(TSRMLS_D);
void mongo_init_MongoGridFSCursor(TSRMLS_D);

#if PHP_VERSION_ID >= 50300
void mongo_init_MongoWriteBatch(TSRMLS_D);
void mongo_init_MongoInsertBatch(TSRMLS_D);
void mongo_init_MongoUpdateBatch(TSRMLS_D);
void mongo_init_MongoDeleteBatch(TSRMLS_D);
#endif

void mongo_init_MongoId(TSRMLS_D);
void mongo_init_MongoCode(TSRMLS_D);
void mongo_init_MongoRegex(TSRMLS_D);
void mongo_init_MongoDate(TSRMLS_D);
void mongo_init_MongoBinData(TSRMLS_D);
void mongo_init_MongoDBRef(TSRMLS_D);
void mongo_init_MongoTimestamp(TSRMLS_D);
void mongo_init_MongoInt32(TSRMLS_D);
void mongo_init_MongoInt64(TSRMLS_D);

/* Shared helper functions */
zval *php_mongo_make_tagsets(mongo_read_preference *rp);
void php_mongo_add_tagsets(zval *return_value, mongo_read_preference *rp);
int php_mongo_set_readpreference(mongo_read_preference *rp, char *read_preference, HashTable *tags TSRMLS_DC);
int php_mongo_trigger_error_on_command_failure(mongo_connection *connection, zval *document TSRMLS_DC);
int php_mongo_trigger_error_on_gle(mongo_connection *connection, zval *document TSRMLS_DC);

ZEND_BEGIN_MODULE_GLOBALS(mongo)
/* php.ini options */
char *default_host;
long default_port;
long request_id;
int chunk_size;

/* $ alternative */
char *cmd_char;
long native_long;
long long_as_object;
long allow_empty_keys;

/* _id generation helpers */
int inc, pid, machine;

/* timestamp generation helper */
long ts_inc;
char *errmsg;

long log_level;
long log_module;
zend_fcall_info log_callback_info;
zend_fcall_info_cache log_callback_info_cache;

long ping_interval;
long ismaster_interval;

mongo_con_manager *manager;
ZEND_END_MODULE_GLOBALS(mongo)

#ifdef ZTS
#include <TSRM.h>
# define MonGlo(v) TSRMG(mongo_globals_id, zend_mongo_globals *, v)
#else
# define MonGlo(v) (mongo_globals.v)
#endif

#define phpext_mongo_ptr &mongo_module_entry

extern zend_module_entry mongo_module_entry;

#endif

/*
* Error codes
*
* TODO: Check and update those all
*
* MongoException:
* 0: The <class> object has not been correctly initialized by its constructor
* 1: zero-length keys are not allowed, did you use $ with double quotes?
* 2: characters not allowed in key: <key>
* 3: insert too large: <size>, max: 16000000
* 5: size of BSON doc is <size> bytes, max 4MB
* 6: no documents given
* 7: MongoCollection::group takes an array, object, or MongoCode key
* 8: field names must be strings
* 9: invalid regex
* 10: MongoDBRef::get: $ref field must be a string
* 11: MongoDBRef::get: $db field must be a string
* 12: non-utf8 string: <str>
* 13: mutex error: <err>
* 14: index name too long: <len>, max <max> characters
* 15: Reading from slaves won't work without using the replicaSet option on connect
* 16: No server found for reads
* 17: The MongoCollection object has not been correctly initialized by its constructor
* 18: ID must be valid hex characters
* 19: Invalid object ID
* 20: Cannot run command count(): (error message from MongoDB)
* 21: Namespace field is invalid.
* 22: invalid index specification
*
* MongoConnectionException:
* 0: connection to <host> failed: <errmsg>
* 1: no server name given
* 2: can't use slaveOkay without replicaSet
* 3: could not store persistent link
* 4: pass in an identifying string to get a persistent connection
* 5: failed to get primary or secondary
* 10: failed to get host from <substr> of <str>
* 11: failed to get port from <substr> of <str>
* 12: lost db connection
* 2X: Parsing errors (ununsed)
* 21: Empty option name or value
* 22: Unknown connection string option
* 23: Logical error (conflicting options)
* 24: (unused)
* 25: Option with no string key
* 26: SSL support is only available when compiled against PHP Streams
* 27: Driver options are only available when compiled against PHP Streams
* 28: GSSAPI authentication mechanism is only available when compiled against PHP Streams
* 29: Plain authentication mechanism is only available when compiled against PHP Streams
* 31: Unknown failure doing io_stream_read.
* 32: When the remote server closes the connection in io_stream_read.
* 72: Could not retrieve connection
*
* MongoCursorTimeoutException:
* 80: timeout exception
*
* MongoCursorException:
* 0: cannot modify cursor after beginning iteration
* 1: get more: send error (C error string)
* 2: get more: cursor not found
* 3: cursor->buf.pos is null
* 4: couldn't get response header
* 5: no db response
* 6: bad response length: <len>, max: <len>, did the db assert?
* 7: incomplete header
* 8: incomplete response
* 9: couldn't find a response
* 10: error getting socket
* 11: couldn't find reply, please try again
* 12: [WSA ]error getting database response: <err>
* 13: Timeout error (C error)
* 14: couldn't send query: <err>
* 15: couldn't get sock for safe op
* 16: couldn't send safe op
* 17: exceptional condition on socket
* 18: Trying to get more, but cannot find server
* 19: max number of retries exhausted, couldn't send query
* 20: something exceptional has happened, and the cursor is now dead
* 21: invalid string length for key "%s"
* 22: invalid binary length for key "%s"
* 23: Can not natively represent the long %llu on this platform
* 24: invalid code length for key "%s"
* 28: recv_header() (abs()) recv_data() stream handlers error (timeout)
* 29: Unknown query/get_more failure
* 30: Cursor command response does not have the expected structure
* 32: Cursor command structure is invalid
* 33: cannot iterate twice with command cursors created through createFromDocument
* 34: Cursor structure is invalid
* 35: Message size (%d) overflows valid message size (%d) php_mongo_api_get_reply()
* 36: request/response mismatch: %d vs %d php_mongo_api_get_reply()
* 37: Couldn't finish reading from network
*
* MongoGridFSException:
* 0:
* 1: There is more data in the stored file than the meta data shows
* 2: Invalid collection prefix (throws Exception, not MongoGridFSException)
* 3: Could not open file for reading
* 4: Filesize larger then we can handle
* 5: Invalid filehandle for a resource
* 6: Resource doesn't contain filehandle
* 7: Error setting up file for reading
* 8: Argument not a file stream or a filename string (throws Exception, not MongoGridFSException)
* 9: Error reading file data
* 10: Error reading from resource
* 11: Can't find uploaded file
* 12: tmp_name not found, upload probably failed
* 13: tmp_name was not a valid filename
* 14: Unable to determin file size
* 15: Missing filename
* 16: Could not open filename for writing
* 17: Could not read chunk
* 18: Failed creating file stream
* 19: Could not find array key
* 20: Chunk larger then chunksize
* 21: Unexpected chunk format
*
* MongoResultException:
* 1: Unknown error executing command (empty document returned)
* 2: Command could not be executed for some reason (exception message tells why)
* 1000+: MongoDB server codes
*
* MongoWriteConcernException:
* 100: <server error message> (server returned no error code, only message)
* 101: Unknown error occurred, did not get an error message or code
* 102: Got write errors, but don't know how to parse them
* 103: Missing 'ok' field in response, don't know what to do
* 104: Got write errors, but don't know how to parse them
* 105: Got write errors, but don't know how to parse them
* (all other error codes are from mongod)
*
* MongoProtocolException:
* 1: Current primary does not have a Write API support
*/

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