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/**
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you 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 <iostream>
#include <string_view>
#include "tscpp/api/GlobalPlugin.h"
#include "tscpp/api/TransactionPlugin.h"
#include "tscpp/api/TransformationPlugin.h"
#include "tscpp/api/PluginInit.h"
#include "tscpp/api/Logger.h"
#include "tscpp/api/Continuation.h"
#include "ts/ts.h"
using namespace atscppapi;
/*
* This example demonstrates how you can pause a transformation and resume it
* after doing some work simply by calling the pause method.
* To resume just schedule the return value of pause method (cont)
*/
namespace
{
#define TAG "delay_transformation"
GlobalPlugin *plugin;
} // namespace
class DelayTransformationPlugin : public TransformationPlugin
{
public:
DelayTransformationPlugin(Transaction &transaction, TransformationPlugin::Type xformType)
: TransformationPlugin(transaction, xformType)
{
registerHook((xformType == TransformationPlugin::REQUEST_TRANSFORMATION) ? HOOK_SEND_REQUEST_HEADERS :
HOOK_SEND_RESPONSE_HEADERS);
}
void
handleSendRequestHeaders(Transaction &transaction) override
{
transaction.getServerRequest().getHeaders()["X-Content-Delayed"] = "1";
transaction.resume();
}
void
handleSendResponseHeaders(Transaction &transaction) override
{
transaction.getClientResponse().getHeaders()["X-Content-Delayed"] = "1";
transaction.resume();
}
void
consume(std::string_view data) override
{
TS_DEBUG(TAG, "Consuming...");
produce(data);
TS_DEBUG(TAG, "Pausing...");
pause();
TS_DEBUG(TAG, "Resuming in 2ms...");
resumeCont().schedule(2, TS_THREAD_POOL_NET);
}
void
handleInputComplete() override
{
TS_DEBUG(TAG, "handleInputComplete");
setOutputComplete();
}
~DelayTransformationPlugin() override {}
};
class GlobalHookPlugin : public GlobalPlugin
{
public:
GlobalHookPlugin()
{
registerHook(HOOK_READ_REQUEST_HEADERS_POST_REMAP);
registerHook(HOOK_READ_RESPONSE_HEADERS);
}
void
handleReadRequestHeadersPostRemap(Transaction &transaction) override
{
transaction.addPlugin(new DelayTransformationPlugin(transaction, TransformationPlugin::REQUEST_TRANSFORMATION));
transaction.resume();
}
void
handleReadResponseHeaders(Transaction &transaction) override
{
transaction.addPlugin(new DelayTransformationPlugin(transaction, TransformationPlugin::RESPONSE_TRANSFORMATION));
transaction.resume();
}
};
void
TSPluginInit(int argc ATSCPPAPI_UNUSED, const char *argv[] ATSCPPAPI_UNUSED)
{
if (!RegisterGlobalPlugin("CPP_Example_DelayTransformation", "apache", "dev@trafficserver.apache.org")) {
return;
}
TS_DEBUG(TAG, "TSPluginInit");
plugin = new GlobalHookPlugin();
}
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