78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*
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* WatchFile.actor.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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// When actually compiled (NO_INTELLISENSE), include the generated
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// version of this file. In intellisense use the source version.
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#if defined(NO_INTELLISENSE) && !defined(FLOW_WATCH_FILE_ACTOR_G_H)
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#define FLOW_WATCH_FILE_ACTOR_G_H
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#include "flow/WatchFile.actor.g.h"
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#elif !defined(FLOW_WATCH_FILE_ACTOR_H)
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#define FLOW_WATCH_FILE_ACTOR_H
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#include <ctime>
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#include <string>
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#include "flow/IAsyncFile.h"
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#include "flow/genericactors.actor.h"
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#include "flow/actorcompiler.h"
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ACTOR static Future<Void> watchFileForChanges(std::string filename,
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AsyncTrigger* fileChanged,
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const int* intervalSeconds,
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const char* errorType) {
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if (filename == "") {
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return Never();
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}
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state bool firstRun = true;
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state bool statError = false;
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state std::time_t lastModTime = 0;
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loop {
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try {
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std::time_t modtime = wait(IAsyncFileSystem::filesystem()->lastWriteTime(filename));
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if (firstRun) {
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lastModTime = modtime;
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firstRun = false;
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}
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if (lastModTime != modtime || statError) {
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lastModTime = modtime;
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statError = false;
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fileChanged->trigger();
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}
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} catch (Error& e) {
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if (e.code() == error_code_io_error) {
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// EACCES, ELOOP, ENOENT all come out as io_error(), but are more of a system
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// configuration issue than an FDB problem. If we managed to load valid
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// certificates, then there's no point in crashing, but we should complain
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// loudly. IAsyncFile will log the error, but not necessarily as a warning.
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TraceEvent(SevWarnAlways, errorType).detail("File", filename);
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statError = true;
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} else {
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throw;
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}
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}
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wait(delay(*intervalSeconds));
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}
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}
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#include "flow/unactorcompiler.h"
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#endif // FLOW_WATCH_FILE_ACTOR_H
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