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cursor.c
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cursor.c
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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.
*/
#include <php.h>
#include <zend_interfaces.h>
#include <zend_exceptions.h>
#include "mcon/manager.h"
#include "mcon/utils.h"
#include "exceptions/duplicate_key_exception.h"
#include "exceptions/execution_timeout_exception.h"
#include "cursor_shared.h"
#ifdef WIN32
# ifndef int64_t
typedef __int64 int64_t;
# endif
#else
# include <unistd.h>
#endif
#include <math.h>
#include "php_mongo.h"
#include "bson.h"
#include "db.h"
#include "cursor.h"
#include "collection.h"
#include "util/log.h"
#include "log_stream.h"
#include "cursor_shared.h"
#include "contrib/php-json.h"
/* externs */
extern zend_class_entry *mongo_ce_Id, *mongo_ce_MongoClient, *mongo_ce_DB;
extern zend_class_entry *mongo_ce_Collection, *mongo_ce_Exception;
extern zend_class_entry *mongo_ce_CursorInterface;
extern zend_class_entry *mongo_ce_ConnectionException;
extern zend_class_entry *mongo_ce_CursorException;
extern zend_class_entry *mongo_ce_CursorTimeoutException;
extern zend_class_entry *mongo_ce_DuplicateKeyException;
extern zend_class_entry *mongo_ce_ExecutionTimeoutException;
extern zend_object_handlers mongo_default_handlers;
ZEND_EXTERN_MODULE_GLOBALS(mongo)
static zend_object_value php_mongo_cursor_new(zend_class_entry *class_type TSRMLS_DC);
static int have_error_flags(mongo_cursor *cursor);
zend_class_entry *mongo_ce_Cursor = NULL;
/* Queries the database. Returns SUCCESS or FAILURE. */
static int mongo_cursor__do_query(zval *this_ptr, zval *return_value TSRMLS_DC);
/* If the query should be send to the db or not. The rules are:
* - db commands should only be sent onces (no retries)
* - normal queries should be sent up to 5 times
* This uses exponential backoff with a random seed to avoid flooding a
* struggling db with retries. */
static int mongo_cursor__should_retry(mongo_cursor *cursor);
#define PREITERATION_SETUP \
PHP_MONGO_GET_CURSOR(getThis()); \
\
if (cursor->started_iterating) { \
zend_throw_exception(mongo_ce_CursorException, "cannot modify cursor after beginning iteration.", 0 TSRMLS_CC); \
return; \
}
/* {{{ MongoCursor->__construct(MongoClient connection, string ns [, array query [, array fields]])
Constructs a MongoCursor */
PHP_METHOD(MongoCursor, __construct)
{
zval *zlink = 0, *zquery = 0, *zfields = 0, *empty, *timeout;
char *ns;
int ns_len;
zval **data;
mongo_cursor *cursor;
mongoclient *link;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "Os|zz", &zlink, mongo_ce_MongoClient, &ns, &ns_len, &zquery, &zfields) == FAILURE) {
return;
}
if (!php_mongo_is_valid_namespace(ns, ns_len)) {
php_mongo_cursor_throw(mongo_ce_CursorException, NULL, 21 TSRMLS_CC, "An invalid 'ns' argument is given (%s)", ns);
return;
}
MUST_BE_ARRAY_OR_OBJECT(3, zquery);
MUST_BE_ARRAY_OR_OBJECT(4, zfields);
cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
link = (mongoclient*)zend_object_store_get_object(zlink TSRMLS_CC);
MONGO_CHECK_INITIALIZED(link->manager, MongoClient);
/* if query or fields weren't passed, make them default to an empty array */
MAKE_STD_ZVAL(empty);
object_init(empty);
/* These are both initialized to the same zval, but that's okay because.
* There's no way to change them without creating a new cursor */
if (!zquery || (Z_TYPE_P(zquery) == IS_ARRAY && zend_hash_num_elements(HASH_P(zquery)) == 0)) {
zquery = empty;
}
if (!zfields) {
zfields = empty;
}
/* db connection */
cursor->zmongoclient = zlink;
zval_add_ref(&zlink);
/* Legacy handling where the projection is an array of field names to be
* included (e.g. ['x', 'y', 'z'] is converted to {'x': 1, 'y': 1, 'z': 1}).
* This behavior dates back to 0.9.4, but there is no record of it in the
* extension's documentation. It should be deprecated/removed in the future,
* as it conflicts with supporting some legitimate projections (PHP-1056).
*/
if (Z_TYPE_P(zfields) == IS_ARRAY && php_mongo_is_numeric_array(zfields TSRMLS_CC) == SUCCESS) {
HashPosition pointer;
zval *fields;
MAKE_STD_ZVAL(fields);
array_init(fields);
/* fields to return */
for (
zend_hash_internal_pointer_reset_ex(Z_ARRVAL_P(zfields), &pointer);
zend_hash_get_current_data_ex(Z_ARRVAL_P(zfields), (void**) &data, &pointer) == SUCCESS;
zend_hash_move_forward_ex(Z_ARRVAL_P(zfields), &pointer)
) {
int key_type, key_len;
ulong index;
char *key;
key_type = zend_hash_get_current_key_ex(Z_ARRVAL_P(zfields), &key, (uint*)&key_len, &index, NO_DUP, &pointer);
if (key_type == HASH_KEY_IS_LONG) {
if (Z_TYPE_PP(data) == IS_STRING) {
add_assoc_long(fields, Z_STRVAL_PP(data), 1);
} else {
zval_ptr_dtor(&empty);
zval_ptr_dtor(&fields);
zend_throw_exception(mongo_ce_Exception, "field names must be strings", 8 TSRMLS_CC);
return;
}
} else {
add_assoc_zval(fields, key, *data);
zval_add_ref(data);
}
}
cursor->fields = fields;
} else {
/* if it's already an object, we don't have to worry */
cursor->fields = zfields;
zval_add_ref(&zfields);
}
/* ns */
cursor->ns = estrdup(ns);
/* query */
cursor->query = zquery;
zval_add_ref(&zquery);
/* reset iteration pointer, just in case */
php_mongo_cursor_reset(cursor TSRMLS_CC);
/* Set initial connection to NULL. This allows us to override the cursor
* just after construction. THis is useful as a temporary hack until we
* have refactored to create cursors with an already configured cursor. See
* also the other TODO in this file on this. */
cursor->connection = NULL;
cursor->at = 0;
cursor->num = 0;
cursor->special = 0;
cursor->persist = 0;
timeout = zend_read_static_property(mongo_ce_Cursor, "timeout", strlen("timeout"), NOISY TSRMLS_CC);
convert_to_long(timeout);
/* The value hasn't been modified from what we registered it as originally */
if (Z_LVAL_P(timeout) == PHP_MONGO_STATIC_CURSOR_TIMEOUT_NOT_SET_INITIALIZER) {
cursor->timeout = link->servers->options.socketTimeoutMS;
mongo_manager_log(link->manager, MLOG_CON, MLOG_FINE, "Initializing cursor timeout to %d (from connection options)", cursor->timeout);
} else {
cursor->timeout = Z_LVAL_P(timeout);
/* The value was modified, bad user, bad user! Tell him its deprecated */
php_error_docref(NULL TSRMLS_CC, MONGO_E_DEPRECATED, "The 'MongoCursor::$timeout' static property is deprecated, please call MongoCursor->timeout() instead");
mongo_manager_log(link->manager, MLOG_CON, MLOG_FINE, "Initializing cursor timeout to %d (from deprecated static property)", cursor->timeout);
}
/* If the static property "slaveOkay" is set, we need to switch to a
* MONGO_RP_SECONDARY_PREFERRED as well, but only if read preferences
* aren't already set. */
if (cursor->read_pref.type == MONGO_RP_PRIMARY) {
zval *zslaveokay;
zslaveokay = zend_read_static_property(mongo_ce_Cursor, "slaveOkay", strlen("slaveOkay"), NOISY TSRMLS_CC);
if (Z_TYPE_P(zslaveokay) != IS_NULL) {
cursor->read_pref.type = Z_BVAL_P(zslaveokay) ? MONGO_RP_SECONDARY_PREFERRED : MONGO_RP_PRIMARY;
php_error_docref(NULL TSRMLS_CC, MONGO_E_DEPRECATED, "The 'slaveOkay' option is deprecated. Please switch to read-preferences");
}
}
/* get rid of extra ref */
zval_ptr_dtor(&empty);
}
/* }}} */
/* {{{ MongoCursor::hasNext
*/
PHP_METHOD(MongoCursor, hasNext)
{
mongo_cursor *cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
if (!cursor->started_iterating) {
MONGO_METHOD(MongoCursor, doQuery, return_value, getThis());
cursor->started_iterating = 1;
}
MONGO_CHECK_INITIALIZED(cursor->connection, MongoCursor);
if ((cursor->limit > 0 && cursor->at >= cursor->limit) || cursor->num == 0) {
if (cursor->cursor_id != 0) {
php_mongo_kill_cursor(cursor->connection, cursor->cursor_id TSRMLS_CC);
cursor->cursor_id = 0;
}
RETURN_FALSE;
}
if (cursor->at < cursor->num) {
RETURN_TRUE;
} else if (cursor->cursor_id == 0) {
RETURN_FALSE;
} else if (cursor->connection == NULL) {
/* if we have a cursor_id, we should have a server */
php_mongo_cursor_throw(mongo_ce_CursorException, NULL, 18 TSRMLS_CC, "trying to get more, but cannot find server");
return;
}
if (!php_mongo_get_more(cursor TSRMLS_CC)) {
RETURN_FALSE;
}
if (have_error_flags(cursor)) {
RETURN_TRUE;
}
/* if cursor_id != 0, server should stay the same */
/* sometimes we'll have a cursor_id but there won't be any more results */
if (cursor->at >= cursor->num) {
RETVAL_FALSE;
} else {
/* but sometimes there will be */
RETVAL_TRUE;
}
}
/* }}} */
/* {{{ MongoCursor::getNext
*/
PHP_METHOD(MongoCursor, getNext)
{
mongo_cursor *cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
MONGO_CURSOR_CHECK_DEAD;
MONGO_METHOD(MongoCursor, next, return_value, getThis());
/* will be null unless there was an error */
if (EG(exception) || (Z_TYPE_P(return_value) == IS_BOOL && Z_BVAL_P(return_value) == 0)) {
ZVAL_NULL(return_value);
return;
}
MONGO_CURSOR_CHECK_DEAD;
if (cursor->current) {
RETURN_ZVAL(cursor->current, 1, 0);
} else {
RETURN_NULL();
}
}
/* }}} */
/* {{{ MongoCursor::limit
*/
PHP_METHOD(MongoCursor, limit)
{
long l;
mongo_cursor *cursor;
PREITERATION_SETUP;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &l) == FAILURE) {
return;
}
php_mongo_cursor_set_limit(cursor, l);
RETVAL_ZVAL(getThis(), 1, 0);
}
/* }}} */
/* {{{ MongoCursor::skip
*/
PHP_METHOD(MongoCursor, skip)
{
long l;
mongo_cursor *cursor;
PREITERATION_SETUP;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &l) == FAILURE) {
return;
}
cursor->skip = l;
RETURN_ZVAL(getThis(), 1, 0);
}
/* }}} */
/* {{{ MongoCursor::fields
*/
PHP_METHOD(MongoCursor, fields)
{
zval *z;
mongo_cursor *cursor;
PREITERATION_SETUP;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &z) == FAILURE) {
return;
}
MUST_BE_ARRAY_OR_OBJECT(1, z);
zval_ptr_dtor(&cursor->fields);
cursor->fields = z;
zval_add_ref(&z);
RETURN_ZVAL(getThis(), 1, 0);
}
/* }}} */
/* {{{ proto MongoCursor MongoCursor::maxTimeMS(int ms)
* Configures a maximum time for the query to run, including fetching results. */
PHP_METHOD(MongoCursor, maxTimeMS)
{
long time_ms;
mongo_cursor *cursor;
zval *value;
PREITERATION_SETUP;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &time_ms) == FAILURE) {
return;
}
PHP_MONGO_GET_CURSOR(getThis());
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
MAKE_STD_ZVAL(value);
ZVAL_LONG(value, time_ms);
if (php_mongo_cursor_add_option(cursor, "$maxTimeMS", value TSRMLS_CC)) {
RETVAL_ZVAL(getThis(), 1, 0);
}
zval_ptr_dtor(&value);
}
/* }}} */
/* {{{ Cursor flags
Sets or unsets the flag <flag>. With mode = -1, the arguments are parsed.
Otherwise the mode should contain 0 for unsetting and 1 for setting the flag. */
static inline void set_cursor_flag(INTERNAL_FUNCTION_PARAMETERS, int flag, int mode)
{
zend_bool z = 1;
mongo_cursor *cursor;
PREITERATION_SETUP;
if (mode == -1) {
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|b", &z) == FAILURE) {
return;
}
} else {
z = mode;
}
if (z) {
cursor->opts |= flag;
} else {
cursor->opts &= ~flag;
}
RETURN_ZVAL(getThis(), 1, 0);
}
/* {{{ MongoCursor::setFlag(int bit [, bool set])
*/
PHP_METHOD(MongoCursor, setFlag)
{
long bit;
zend_bool set = 1;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l|b", &bit, &set) == FAILURE) {
return;
}
/* Prevent bit 6 (CURSOR_FLAG_EXHAUST) from being set. This is because the
* driver can't handle this at the moment. */
if (bit == 6) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "The CURSOR_FLAG_EXHAUST(6) flag is not supported");
return;
}
set_cursor_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1 << bit, set);
}
/* }}} */
/* {{{ MongoCursor::tailable(bool flag)
*/
PHP_METHOD(MongoCursor, tailable)
{
set_cursor_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, CURSOR_FLAG_TAILABLE, -1);
}
/* }}} */
/* {{{ MongoCursor::slaveOkay(bool flag)
*/
PHP_METHOD(MongoCursor, slaveOkay)
{
mongo_cursor *cursor;
zend_bool slave_okay = 1;
PREITERATION_SETUP;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|b", &slave_okay) == FAILURE) {
return;
}
set_cursor_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, CURSOR_FLAG_SLAVE_OKAY, slave_okay);
/* slaveOkay implicitly sets read preferences.
*
* With slave_okay being true or absent, the RP is switched to SECONDARY
* PREFERRED but only if the current configured RP is PRIMARY - so that
* other read preferences are not overwritten. As slaveOkay really only
* means "read from any secondary" that does not conflict.
*
* With slave_okay being false, the RP is switched to PRIMARY. Setting it
* to PRIMARY when it already is PRIMARY doesn't hurt. */
if (slave_okay) {
if (cursor->read_pref.type == MONGO_RP_PRIMARY) {
cursor->read_pref.type = MONGO_RP_SECONDARY_PREFERRED;
}
} else {
cursor->read_pref.type = MONGO_RP_PRIMARY;
}
}
/* }}} */
/* {{{ MongoCursor::immortal(bool flag)
*/
PHP_METHOD(MongoCursor, immortal)
{
set_cursor_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, CURSOR_FLAG_NO_CURSOR_TO, -1);
}
/* }}} */
/* {{{ MongoCursor::awaitData(bool flag)
*/
PHP_METHOD(MongoCursor, awaitData)
{
set_cursor_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, CURSOR_FLAG_AWAIT_DATA, -1);
}
/* }}} */
/* {{{ MongoCursor::partial(bool flag)
*/
PHP_METHOD(MongoCursor, partial)
{
set_cursor_flag(INTERNAL_FUNCTION_PARAM_PASSTHRU, CURSOR_FLAG_PARTIAL, -1);
}
/* }}} */
/* }}} */
/* {{{ MongoCursor::timeout
*/
PHP_METHOD(MongoCursor, timeout) {
long timeout;
mongo_cursor *cursor;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &timeout) == FAILURE) {
return;
}
PHP_MONGO_GET_CURSOR(getThis());
cursor->timeout = timeout;
RETURN_ZVAL(getThis(), 1, 0);
}
/* }}} */
PHP_METHOD(MongoCursor, getReadPreference)
{
mongo_cursor *cursor;
PHP_MONGO_GET_CURSOR(getThis());
array_init(return_value);
add_assoc_string(return_value, "type", mongo_read_preference_type_to_name(cursor->read_pref.type), 1);
php_mongo_add_tagsets(return_value, &cursor->read_pref);
}
/* {{{ MongoCursor::setReadPreference(string read_preference [, array tags ])
Sets a read preference to be used for all read queries.*/
PHP_METHOD(MongoCursor, setReadPreference)
{
char *read_preference;
int read_preference_len;
mongo_cursor *cursor;
HashTable *tags = NULL;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|h", &read_preference, &read_preference_len, &tags) == FAILURE) {
return;
}
PHP_MONGO_GET_CURSOR(getThis());
php_mongo_set_readpreference(&cursor->read_pref, read_preference, tags TSRMLS_CC);
RETURN_ZVAL(getThis(), 1, 0);
}
/* }}} */
/* {{{ MongoCursor::addOption
*/
PHP_METHOD(MongoCursor, addOption)
{
char *key;
int key_len;
zval *value;
mongo_cursor *cursor;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sz", &key, &key_len, &value) == FAILURE) {
return;
}
PHP_MONGO_GET_CURSOR(getThis());
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
if (php_mongo_cursor_add_option(cursor, key, value TSRMLS_CC)) {
RETURN_ZVAL(getThis(), 1, 0);
}
}
/* }}} */
/* {{{ MongoCursor::snapshot
*/
PHP_METHOD(MongoCursor, snapshot)
{
zval *yes;
mongo_cursor *cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
MAKE_STD_ZVAL(yes);
ZVAL_TRUE(yes);
if (php_mongo_cursor_add_option(cursor, "$snapshot", yes TSRMLS_CC)) {
RETVAL_ZVAL(getThis(), 1, 0);
}
zval_ptr_dtor(&yes);
}
/* }}} */
/* {{{ MongoCursor->sort(array fields)
*/
PHP_METHOD(MongoCursor, sort)
{
zval *fields;
mongo_cursor *cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &fields) == FAILURE) {
return;
}
MUST_BE_ARRAY_OR_OBJECT(1, fields);
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
if (php_mongo_cursor_add_option(cursor, "$orderby", fields TSRMLS_CC)) {
RETURN_ZVAL(getThis(), 1, 0);
}
}
/* }}} */
/* {{{ proto MongoCursor MongoCursor::hint(mixed index)
Hint the index, by name or fields, to use for the query. */
PHP_METHOD(MongoCursor, hint)
{
zval *index;
mongo_cursor *cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &index) == FAILURE) {
return;
}
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
if (php_mongo_cursor_add_option(cursor, "$hint", index TSRMLS_CC)) {
RETURN_ZVAL(getThis(), 1, 0);
}
}
/* }}} */
/* {{{ MongoCursor->explain
*/
PHP_METHOD(MongoCursor, explain)
{
int temp_limit;
zval *yes;
mongo_cursor *cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
php_mongo_cursor_reset(cursor TSRMLS_CC);
/* make explain use a hard limit */
temp_limit = cursor->limit;
if (cursor->limit > 0) {
cursor->limit *= -1;
}
MAKE_STD_ZVAL(yes);
ZVAL_TRUE(yes);
if (!php_mongo_cursor_add_option(cursor, "$explain", yes TSRMLS_CC)) {
zval_ptr_dtor(&yes);
return;
}
zval_ptr_dtor(&yes);
MONGO_METHOD(MongoCursor, getNext, return_value, getThis());
/* reset cursor to original state */
cursor->limit = temp_limit;
zend_hash_del(HASH_P(cursor->query), "$explain", strlen("$explain") + 1);
php_mongo_cursor_reset(cursor TSRMLS_CC);
}
/* }}} */
/* {{{ MongoCursor->doQuery
*/
PHP_METHOD(MongoCursor, doQuery)
{
mongo_cursor *cursor;
PHP_MONGO_GET_CURSOR(getThis());
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
do {
php_mongo_cursor_reset(cursor TSRMLS_CC);
if (mongo_cursor__do_query(getThis(), return_value TSRMLS_CC) == SUCCESS || EG(exception)) {
return;
}
} while (mongo_cursor__should_retry(cursor));
if (strcmp(".$cmd", cursor->ns+(strlen(cursor->ns)-5)) == 0) {
php_mongo_cursor_throw(mongo_ce_CursorException, cursor->connection, 19 TSRMLS_CC, "couldn't send command");
return;
}
php_mongo_cursor_throw(mongo_ce_CursorException, cursor->connection, 19 TSRMLS_CC, "max number of retries exhausted, couldn't send query");
}
/* }}} */
/* Adds the $readPreference option to the query objects */
void mongo_apply_mongos_rp(mongo_cursor *cursor)
{
zval *rp, *tags;
char *type;
/* Older mongos don't like $readPreference, so don't apply it
* when we want the default behaviour anyway */
if (cursor->read_pref.type == MONGO_RP_PRIMARY) {
return;
}
if (cursor->read_pref.type == MONGO_RP_SECONDARY_PREFERRED) {
/* If there aren't any tags, don't add $readPreference, the slaveOkay
* flag is enough This gives us improved compatability with older
* mongos */
if (cursor->read_pref.tagset_count == 0) {
return;
}
}
type = mongo_read_preference_type_to_name(cursor->read_pref.type);
MAKE_STD_ZVAL(rp);
array_init(rp);
add_assoc_string(rp, "mode", type, 1);
tags = php_mongo_make_tagsets(&cursor->read_pref);
if (tags) {
add_assoc_zval(rp, "tags", tags);
}
php_mongo_make_special(cursor);
add_assoc_zval(cursor->query, "$readPreference", rp);
}
static int mongo_cursor__do_query(zval *this_ptr, zval *return_value TSRMLS_DC)
{
mongo_cursor *cursor;
mongo_buffer buf;
char *error_message;
mongoclient *link;
mongo_read_preference rp;
cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
if (!cursor) {
zend_throw_exception(mongo_ce_Exception, "The MongoCursor object has not been correctly initialized by its constructor", 0 TSRMLS_CC);
return FAILURE;
}
/* db connection zmongoclient */
link = (mongoclient*)zend_object_store_get_object(cursor->zmongoclient TSRMLS_CC);
if (!link->servers) {
zend_throw_exception(mongo_ce_Exception, "The Mongo object has not been correctly initialized by its constructor", 0 TSRMLS_CC);
return FAILURE;
}
/* If we had a connection we need to remove it from the callback map before
* we assign it another connection. */
if (cursor->connection) {
mongo_deregister_callback_from_connection(cursor->connection, cursor);
}
/* Sets the wire protocol flag to allow reading from a secondary. The read
* preference spec states: "slaveOk remains as a bit in the wire protocol
* and drivers will set this bit to 1 for all reads except with PRIMARY
* read preference." */
cursor->opts = cursor->opts | (cursor->read_pref.type != MONGO_RP_PRIMARY ? CURSOR_FLAG_SLAVE_OKAY : 0);
/* store the link's read preference to backup, and overwrite with the
* cursors's read preferences */
mongo_read_preference_copy(&link->servers->read_pref, &rp);
mongo_read_preference_replace(&cursor->read_pref, &link->servers->read_pref);
/* TODO: We have to assume to use a read connection here, but it should
* really be refactored so that we can create a cursor with the correct
* read/write setup already, instead of having to force a new mode later
* (like we do for commands right now through
* php_mongo_cursor_force_primary). See also MongoDB::command and
* append_getlasterror, where this has to be done too. */
cursor->connection = mongo_get_read_write_connection_with_callback(
link->manager,
link->servers,
cursor->cursor_options & MONGO_CURSOR_OPT_FORCE_PRIMARY ? MONGO_CON_FLAG_WRITE : MONGO_CON_FLAG_READ,
cursor,
php_mongo_cursor_mark_dead,
(char**) &error_message
);
/* restore read preferences from backup */
mongo_read_preference_replace(&rp, &link->servers->read_pref);
mongo_read_preference_dtor(&rp);
/* Throw exception in case we have no connection */
if (cursor->connection == NULL) {
if (error_message) {
zend_throw_exception(mongo_ce_ConnectionException, error_message, 71 TSRMLS_CC);
free(error_message);
} else {
zend_throw_exception(mongo_ce_ConnectionException, "Could not retrieve connection", 72 TSRMLS_CC);
}
return FAILURE;
}
/* Apply read preference query option, but only if we have a MongoS
* connection */
if (cursor->connection->connection_type == MONGO_NODE_MONGOS) {
mongo_apply_mongos_rp(cursor);
}
/* Create query buffer */
CREATE_BUF(buf, INITIAL_BUF_SIZE);
if (php_mongo_write_query(&buf, cursor, cursor->connection->max_bson_size, cursor->connection->max_message_size TSRMLS_CC) == FAILURE) {
efree(buf.start);
return FAILURE;
}
mongo_log_stream_query(cursor->connection, cursor TSRMLS_CC);
if (link->manager->send(cursor->connection, &link->servers->options, buf.start, buf.pos - buf.start, (char **) &error_message) == -1) {
if (error_message) {
php_mongo_cursor_throw(mongo_ce_CursorException, cursor->connection, 14 TSRMLS_CC, "couldn't send query: %s", error_message);
free(error_message);
} else {
php_mongo_cursor_throw(mongo_ce_CursorException, cursor->connection, 14 TSRMLS_CC, "couldn't send query");
}
efree(buf.start);
return php_mongo_cursor_failed(cursor TSRMLS_CC);
}
efree(buf.start);
if (php_mongo_get_reply(cursor TSRMLS_CC) == FAILURE) {
/* php_mongo_get_reply() throws exceptions */
return php_mongo_cursor_failed(cursor TSRMLS_CC);
}
return SUCCESS;
}
/* }}} */
/* ITERATOR FUNCTIONS */
/* {{{ MongoCursor->current
*/
PHP_METHOD(MongoCursor, current)
{
mongo_cursor *cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
MONGO_CURSOR_CHECK_DEAD;
if (cursor->current) {
RETURN_ZVAL(cursor->current, 1, 0);
} else {
RETURN_NULL();
}
}
/* }}} */
/* {{{ MongoCursor->key
*/
PHP_METHOD(MongoCursor, key)
{
zval **id;
mongo_cursor *cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
if (!cursor->current) {
RETURN_NULL();
}
if (cursor->current && Z_TYPE_P(cursor->current) == IS_ARRAY && zend_hash_find(HASH_P(cursor->current), "_id", 4, (void**)&id) == SUCCESS) {
if (Z_TYPE_PP(id) == IS_OBJECT) {
zend_std_cast_object_tostring(*id, return_value, IS_STRING TSRMLS_CC);
} else {
RETVAL_ZVAL(*id, 1, 0);
convert_to_string(return_value);
}
} else {
RETURN_LONG(cursor->at - 1);
}
}
/* }}} */
static int mongo_cursor__should_retry(mongo_cursor *cursor)
{
int microseconds = 50000, slots = 0, wait_us = 0;
/* never retry commands */
if (cursor->retry >= 5 || strcmp(".$cmd", cursor->ns+(strlen(cursor->ns)-5)) == 0) {
return 0;
}
slots = (int)pow(2.0, cursor->retry++);
wait_us = (rand() % slots) * microseconds;
#ifdef WIN32
/* Windows sleep takes milliseconds */
Sleep(wait_us/1000);
#else
{
/* usleep is deprecated */
struct timespec wait;
wait.tv_sec = wait_us / 1000000;
wait.tv_nsec = (wait_us % 1000000) * 1000;
nanosleep(&wait, 0);
}
#endif
return 1;
}
/* Returns 1 when an error was found and it returns 0 if no error
* situation has ocurred on the cursor */
static int have_error_flags(mongo_cursor *cursor)
{
if (cursor->flag & MONGO_OP_REPLY_ERROR_FLAGS) {
return 1;
}
return 0;
}
/* {{{ MongoCursor->next
*/
PHP_METHOD(MongoCursor, next)
{
zval has_next;
mongo_cursor *cursor;
PHP_MONGO_GET_CURSOR(getThis());
MONGO_CURSOR_CHECK_DEAD;
if (!cursor->started_iterating) {
MONGO_METHOD(MongoCursor, doQuery, return_value, getThis());
if (EG(exception)) {
return;
}
cursor->started_iterating = 1;
}
/* destroy old current */
if (cursor->current) {
zval_ptr_dtor(&cursor->current);
cursor->current = 0;
}
/* check for results */
MONGO_METHOD(MongoCursor, hasNext, &has_next, getThis());
if (EG(exception)) {
return;
}
if (!Z_BVAL(has_next)) {
/* we're out of results */
/* Might throw an exception */
php_mongo_handle_error(cursor TSRMLS_CC);
RETURN_NULL();
}
/* we got more results */
if (cursor->at < cursor->num) {
mongo_bson_conversion_options options = MONGO_BSON_CONVERSION_OPTIONS_INIT;
if (cursor->cursor_options & MONGO_CURSOR_OPT_CMD_CURSOR) {
options.level = 0;
options.flag_cmd_cursor_as_int64 = 1;
}
MAKE_STD_ZVAL(cursor->current);
array_init(cursor->current);
cursor->buf.pos = bson_to_zval(
(char*)cursor->buf.pos,
Z_ARRVAL_P(cursor->current),
&options
TSRMLS_CC
);
if (EG(exception)) {
zval_ptr_dtor(&cursor->current);
cursor->current = 0;
return;
}
/* increment cursor position */
cursor->at++;
/* Might throw an exception */
if (php_mongo_handle_error(cursor TSRMLS_CC)) {
RETURN_NULL();
}
}
RETURN_NULL();
}
/* }}} */
/* {{{ MongoCursor->rewind
*/
PHP_METHOD(MongoCursor, rewind)
{
mongo_cursor *cursor = (mongo_cursor*)zend_object_store_get_object(getThis() TSRMLS_CC);
MONGO_CHECK_INITIALIZED(cursor->zmongoclient, MongoCursor);
php_mongo_cursor_reset(cursor TSRMLS_CC);
MONGO_METHOD(MongoCursor, next, return_value, getThis());