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ewouldblock_engine.h
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ewouldblock_engine.h
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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2015 Couchbase, 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.
*/
/*
* "ewouldblock_engine"
*
* The "ewouldblock_engine" allows one to test how memcached responds when the
* engine returns EWOULDBLOCK instead of the correct response.
*/
#pragma once
#include "config.h"
#include <memcached/protocol_binary.h>
using request_ewouldblock_ctl = protocol_binary_request_ewb_ctl;
using response_ewouldblock_ctl = protocol_binary_response_ewb_ctl;
// The mode the engine is currently operating in. Determines when it will
// inject EWOULDBLOCK instead of the real return code.
enum class EWBEngineMode : uint32_t {
// Make the next_N calls into engine return {inject_error}. N specified
// by the {value} field.
Next_N = 0,
// Randomly return {inject_error}. Chance to return {inject_error} is
// specified as an integer percentage (1,100) in the {value} field.
Random = 1,
// The first call to a given function from each connection will return
// {inject_error}, with the next (and subsequent) calls to the *same*
// function operating normally. Calling a different function will reset
// back to failing again. In other words, return {inject_error} if the
// previous function was not this one.
First = 2,
// Make the next N calls return a sequence of either their normal value or
// the injected error code. The sequence can be up to 32 elements long.
Sequence = 3,
// Simulate CAS mismatch - make the next N store operations return
// KEY_EEXISTS. N specified by the {value} field.
CasMismatch = 4,
// Increment the cluster map sequence number. Value and inject_error is
// ignored for this opcode
IncrementClusterMapRevno = 5,
// Make a single call into engine and return {inject_error}. In addition
// do not add the operation to the processing queue and so a
// notify_io_complete is never sent.
No_Notify = 6,
// Suspend a cookie with the provided id and return ENGINE_EWOULDBLOCK.
// The connection must be resumed with a call to Resume
Suspend = 7,
// Resume a cookie with the provided id
Resume = 8,
// Next time the connection invokes a call we'll start monitoring a file
// for existence, and when the file goes away we'll notify the connection
// with the {inject_error}.
// The file to monitor is specified in the key for the packet.
// This seems like an odd interface to have, but it is needed to be able
// to test what happens with clients that is working inside the engine
// while a bucket is deleted. Given that we're not instructing the
// ewouldblock engine on a special channel there is no way to send
// commmands to the engine whlie it is being deleted ;-)
BlockMonitorFile = 9,
// Set the CAS for an item.
// Requires the CAS of the item. Bear in mind that we're limited to
// 32 bits.
SetItemCas = 10
};