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/** @file
Plugin to perform background fetches of certain content that would
otherwise not be cached. For example, Range: requests / responses.
@section license License
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.
*/
#pragma once
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <cstdarg>
#include <string>
#include <iostream>
#include <unordered_map>
#include <cinttypes>
#include <string_view>
#include <array>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "ts/ts.h"
#include "ts/remap.h"
typedef std::unordered_map<std::string, bool> OutstandingRequests;
const char PLUGIN_NAME[] = "cache_fill";
class BgFetchState
{
public:
BgFetchState() = default;
BgFetchState(BgFetchState const &) = delete;
void operator=(BgFetchState const &) = delete;
static BgFetchState &
getInstance()
{
static BgFetchState _instance;
return _instance;
}
~BgFetchState() { TSMutexDestroy(_lock); }
bool
acquire(const std::string &url)
{
bool ret;
TSMutexLock(_lock);
if (_urls.end() == _urls.find(url)) {
_urls[url] = true;
ret = true;
} else {
ret = false;
}
TSMutexUnlock(_lock);
TSDebug(PLUGIN_NAME, "BgFetchState.acquire(): ret = %d, url = %s", ret, url.c_str());
return ret;
}
bool
release(const std::string &url)
{
bool ret;
TSMutexLock(_lock);
if (_urls.end() == _urls.find(url)) {
ret = false;
} else {
_urls.erase(url);
ret = true;
}
TSMutexUnlock(_lock);
return ret;
}
private:
OutstandingRequests _urls;
TSMutex _lock = TSMutexCreate();
};
//////////////////////////////////////////////////////////////////////////////
// Hold and manage some state for the TXN background fetch continuation.
// This is necessary, because the TXN is likely to not be available
// during the time we fetch from origin.
struct BgFetchData {
BgFetchData() { memset(&client_ip, 0, sizeof(client_ip)); }
~BgFetchData()
{
TSHandleMLocRelease(mbuf, TS_NULL_MLOC, hdr_loc);
TSHandleMLocRelease(mbuf, TS_NULL_MLOC, url_loc);
TSMBufferDestroy(mbuf);
if (vc) {
TSError("[%s] Destroyed BgFetchDATA while VC was alive", PLUGIN_NAME);
TSVConnClose(vc);
vc = nullptr;
}
// If we got schedule, also clean that up
if (_cont) {
releaseUrl();
TSContDestroy(_cont);
_cont = nullptr;
TSIOBufferReaderFree(req_io_buf_reader);
TSIOBufferDestroy(req_io_buf);
TSIOBufferReaderFree(resp_io_buf_reader);
TSIOBufferDestroy(resp_io_buf);
}
}
bool
acquireUrl() const
{
return BgFetchState::getInstance().acquire(_url);
}
bool
releaseUrl() const
{
return BgFetchState::getInstance().release(_url);
}
const char *
getUrl() const
{
return _url.c_str();
}
void
addBytes(int64_t b)
{
_bytes += b;
}
bool initialize(TSMBuffer request, TSMLoc req_hdr, TSHttpTxn txnp);
void schedule();
TSMBuffer mbuf = TSMBufferCreate();
TSMLoc hdr_loc = TS_NULL_MLOC;
TSMLoc url_loc = TS_NULL_MLOC;
struct sockaddr_storage client_ip;
// This is for the actual background fetch / NetVC
TSVConn vc = nullptr;
TSIOBuffer req_io_buf = nullptr;
TSIOBuffer resp_io_buf = nullptr;
TSIOBufferReader req_io_buf_reader = nullptr;
TSIOBufferReader resp_io_buf_reader = nullptr;
TSVIO r_vio = nullptr;
TSVIO w_vio = nullptr;
private:
std::string _url;
int64_t _bytes = 0;
TSCont _cont = nullptr;
};
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