C++ ShardedConnectionInfo::inForceVersionOkMode方法代码示例

    /**
     * @ return true if not in sharded mode
                     or if version for this client is ok
     */
    bool shardVersionOk( const string& ns , bool isWriteOp , string& errmsg ) {
        if ( ! shardingState.enabled() )
            return true;

        ShardedConnectionInfo* info = ShardedConnectionInfo::get( false );

        if ( ! info ) {
            // this means the client has nothing sharded
            // so this allows direct connections to do whatever they want
            // which i think is the correct behavior
            return true;
        }

        if ( info->inForceVersionOkMode() ) {
            return true;
        }

        // TODO
        //   all collections at some point, be sharded or not, will have a version (and a ShardChunkManager)
        //   for now, we remove the sharding state of dropped collection
        //   so delayed request may come in. This has to be fixed.
        ConfigVersion clientVersion = info->getVersion(ns);
        ConfigVersion version;
        if ( ! shardingState.hasVersion( ns , version ) && clientVersion == 0 ) {
            return true;
        }


        if ( version == 0 && clientVersion > 0 ) {
            stringstream ss;
            ss << "collection was dropped or this shard no longer valied version: " << version << " clientVersion: " << clientVersion;
            errmsg = ss.str();
            return false;
        }

        if ( clientVersion >= version )
            return true;


        if ( clientVersion == 0 ) {
            stringstream ss;
            ss << "client in sharded mode, but doesn't have version set for this collection: " << ns << " myVersion: " << version;
            errmsg = ss.str();
            return false;
        }

        if ( version.majorVersion() == clientVersion.majorVersion() ) {
            // this means there was just a split
            // since on a split w/o a migrate this server is ok
            // going to accept 
            return true;
        }

        stringstream ss;
        ss << "your version is too old  ns: " + ns << " global: " << version << " client: " << clientVersion;
        errmsg = ss.str();
        return false;
    }

    /**
     * @ return true if not in sharded mode
                     or if version for this client is ok
     */
    bool shardVersionOk( const string& ns , bool isWriteOp , string& errmsg ){
        if ( ! shardingState.enabled() )
            return true;

        ShardedConnectionInfo* info = ShardedConnectionInfo::get( false );

        if ( ! info ){
            // this means the client has nothing sharded
            // so this allows direct connections to do whatever they want
            // which i think is the correct behavior
            return true;
        }
        
        if ( info->inForceVersionOkMode() ){
            return true;
        }

        ConfigVersion version;    
        if ( ! shardingState.hasVersion( ns , version ) ){
            return true;
        }

        ConfigVersion clientVersion = info->getVersion(ns);

        if ( version == 0 && clientVersion > 0 ){
            stringstream ss;
            ss << "collection was dropped or this shard no longer valied version: " << version << " clientVersion: " << clientVersion;
            errmsg = ss.str();
            return false;
        }
        
        if ( clientVersion >= version )
            return true;
        

        if ( clientVersion == 0 ){
            stringstream ss;
            ss << "client in sharded mode, but doesn't have version set for this collection: " << ns << " myVersion: " << version;
            errmsg = ss.str();
            return false;
        }

        if ( isWriteOp && version.majorVersion() == clientVersion.majorVersion() ){
            // this means there was just a split 
            // since on a split w/o a migrate this server is ok
            // going to accept write
            return true;
        }

        stringstream ss;
        ss << "your version is too old  ns: " + ns << " global: " << version << " client: " << clientVersion;
        errmsg = ss.str();
        return false;
    }

/**
 * @ return true if not in sharded mode
                 or if version for this client is ok
 */
bool shardVersionOk( const string& ns , string& errmsg, ConfigVersion& received, ConfigVersion& wanted ) {
    if ( ! shardingState.enabled() )
        return true;

    if ( ! isMasterNs( ns.c_str() ) )  {
        // right now connections to secondaries aren't versioned at all
        return true;
    }

    ShardedConnectionInfo* info = ShardedConnectionInfo::get( false );

    if ( ! info ) {
        // this means the client has nothing sharded
        // so this allows direct connections to do whatever they want
        // which i think is the correct behavior
        return true;
    }

    if ( info->inForceVersionOkMode() ) {
        return true;
    }

    // TODO
    //   all collections at some point, be sharded or not, will have a version (and a ShardChunkManager)
    //   for now, we remove the sharding state of dropped collection
    //   so delayed request may come in. This has to be fixed.
    ConfigVersion clientVersion = info->getVersion(ns);
    ConfigVersion version;
    if ( ! shardingState.hasVersion( ns , version ) && ! clientVersion.isSet() ) {
        return true;
    }

    // The versions we're going to compare, saved for future use
    received = clientVersion;
    wanted = version;

    if ( ! version.isSet() && clientVersion.isSet() ) {
        stringstream ss;
        ss << "collection was dropped or this shard no longer valid version";
        errmsg = ss.str();
        return false;
    }

    if ( clientVersion >= version )
        return true;


    if ( ! clientVersion.isSet() ) {
        stringstream ss;
        ss << "client in sharded mode, but doesn't have version set for this collection";
        errmsg = ss.str();
        return false;
    }

    if ( version.majorVersion() == clientVersion.majorVersion() ) {
        // this means there was just a split
        // since on a split w/o a migrate this server is ok
        // going to accept
        return true;
    }

    stringstream ss;
    ss << "your version is too old";
    errmsg = ss.str();
    return false;
}

    /**
     * @ return true if not in sharded mode
                     or if version for this client is ok
     */
    bool shardVersionOk( const string& ns , string& errmsg, ChunkVersion& received, ChunkVersion& wanted ) {

        if ( ! shardingState.enabled() )
            return true;

        if ( ! isMasterNs( ns.c_str() ) )  {
            // right now connections to secondaries aren't versioned at all
            return true;
        }

        ShardedConnectionInfo* info = ShardedConnectionInfo::get( false );

        if ( ! info ) {
            // this means the client has nothing sharded
            // so this allows direct connections to do whatever they want
            // which i think is the correct behavior
            return true;
        }

        if ( info->inForceVersionOkMode() ) {
            return true;
        }

        // TODO : all collections at some point, be sharded or not, will have a version
        //  (and a CollectionMetadata)
        received = info->getVersion( ns );
        wanted = shardingState.getVersion( ns );

        if( received.isWriteCompatibleWith( wanted ) ) return true;

        //
        // Figure out exactly why not compatible, send appropriate error message
        // The versions themselves are returned in the error, so not needed in messages here
        //

        // Check epoch first, to send more meaningful message, since other parameters probably
        // won't match either
        if( ! wanted.hasCompatibleEpoch( received ) ){
            errmsg = str::stream() << "version epoch mismatch detected for " << ns << ", "
                                   << "the collection may have been dropped and recreated";
            return false;
        }

        if( ! wanted.isSet() && received.isSet() ){
            errmsg = str::stream() << "this shard no longer contains chunks for " << ns << ", "
                                   << "the collection may have been dropped";
            return false;
        }

        if( wanted.isSet() && ! received.isSet() ){
            errmsg = str::stream() << "this shard contains versioned chunks for " << ns << ", "
                                   << "but no version set in request";
            return false;
        }

        if( wanted.majorVersion() != received.majorVersion() ){

            //
            // Could be > or < - wanted is > if this is the source of a migration,
            // wanted < if this is the target of a migration
            //

            errmsg = str::stream() << "version mismatch detected for " << ns << ", "
                                   << "stored major version " << wanted.majorVersion()
                                   << " does not match received " << received.majorVersion();
            return false;
        }

        // Those are all the reasons the versions can mismatch
        verify( false );

        return false;

    }