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/*
* (C) Copyright 1996- ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
* In applying this licence, ECMWF does not waive the privileges and immunities
* granted to it by virtue of its status as an intergovernmental organisation nor
* does it submit to any jurisdiction.
*/
#include <fstream>
#include <string>
#include "eckit/exception/Exceptions.h"
#include "eckit/filesystem/LocalPathName.h"
#include "eckit/filesystem/PathName.h"
#include "eckit/io/DataHandle.h"
#include "eckit/log/JSON.h"
#include "eckit/parser/JSONParser.h"
#include "eckit/testing/Test.h"
using namespace std;
using namespace eckit::testing;
namespace eckit::test {
//----------------------------------------------------------------------------------------------------------------------
CASE("Atomically update the contents of a file") {
std::ostringstream s;
JSON json(s);
json.startObject();
json << "restart" << true;
json << "step" << int(42);
json << "description"
<< "forecast run";
json.endObject();
Log::info() << s.str() << std::endl;
PathName path = LocalPathName::cwd() + "/tmp/control.json";
PathName tmppath = PathName::unique(path);
Log::info() << path << std::endl;
Log::info() << tmppath << " : exists " << tmppath.exists() << std::endl;
std::ofstream of(tmppath.localPath());
if (!of) {
throw CantOpenFile(tmppath.localPath(), Here());
}
of << s.str();
of.close();
PathName::rename(tmppath, path);
Log::info() << path << " : exists " << path.exists() << std::endl;
Value j = JSONParser::decodeFile(path);
EXPECT(j.isOrderedMap());
EXPECT(j["restart"].isBool());
EXPECT(j["restart"].as<bool>() == true);
EXPECT(j["step"].isNumber());
EXPECT(int(j["step"]) == 42);
EXPECT(j["description"].isString());
EXPECT(j["description"].as<string>() == std::string("forecast run"));
}
//----------------------------------------------------------------------------------------------------------------------
} // namespace eckit::test
int main(int argc, char** argv) {
return run_tests(argc, argv);
}
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