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86 lines
3.3 KiB
C
86 lines
3.3 KiB
C
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/*
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* Copyright (c) 2019, Redis Labs
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __REDIS_CONNHELPERS_H
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#define __REDIS_CONNHELPERS_H
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#include "connection.h"
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/* These are helper functions that are common to different connection
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* implementations (currently sockets in connection.c and TLS in tls.c).
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*
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* Currently helpers implement the mechanisms for invoking connection
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* handlers, tracking in-handler states and dealing with deferred
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* destruction (if invoked by a handler).
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*/
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/* Called whenever a handler is invoked on a connection and sets the
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* CONN_FLAG_IN_HANDLER flag to indicate we're in a handler context.
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*
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* An attempt to close a connection while CONN_FLAG_IN_HANDLER is
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* set will result with deferred close, i.e. setting the CONN_FLAG_CLOSE_SCHEDULED
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* instead of destructing it.
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*/
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static inline void enterHandler(connection *conn) {
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conn->flags |= CONN_FLAG_IN_HANDLER;
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}
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/* Called whenever a handler returns. This unsets the CONN_FLAG_IN_HANDLER
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* flag and performs actual close/destruction if a deferred close was
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* scheduled by the handler.
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*/
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static inline int exitHandler(connection *conn) {
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conn->flags &= ~CONN_FLAG_IN_HANDLER;
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if (conn->flags & CONN_FLAG_CLOSE_SCHEDULED) {
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connClose(conn);
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return 0;
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}
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return 1;
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}
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/* Helper for connection implementations to call handlers:
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* 1. Mark the handler in use.
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* 2. Execute the handler (if set).
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* 3. Mark the handler as NOT in use and perform deferred close if was
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* requested by the handler at any time.
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*/
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static inline int callHandler(connection *conn, ConnectionCallbackFunc handler) {
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conn->flags |= CONN_FLAG_IN_HANDLER;
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if (handler) handler(conn);
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conn->flags &= ~CONN_FLAG_IN_HANDLER;
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if (conn->flags & CONN_FLAG_CLOSE_SCHEDULED) {
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connClose(conn);
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return 0;
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}
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return 1;
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}
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#endif /* __REDIS_CONNHELPERS_H */
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