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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "wrapper.h"
#include "child-handler.h"
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <vespa/defaults.h>
#include <vespa/log/log.h>
LOG_SETUP(".wrapper");
namespace {
vespalib::string fixDir(const vespalib::string &parent, const vespalib::string &subdir) {
auto dirname = parent + "/" + subdir;
DIR *dp = opendir(dirname.c_str());
if (dp == NULL) {
if (errno != ENOENT || mkdir(dirname.c_str(), 0755) != 0) {
LOG(warning, "Could not create directory '%s'", dirname.c_str());
perror(dirname.c_str());
}
} else {
closedir(dp);
}
return dirname;
}
vespalib::string cfFilePath() {
vespalib::string path = vespa::Defaults::underVespaHome("var/db/vespa");
path = fixDir(path, "otelcol");
return path + "/" + "config.yaml";
}
void writeConfig(const vespalib::string &config, const vespalib::string &path) {
LOG(info, "got config, writing %s", path.c_str());
vespalib::string tmpPath = path + ".new";
FILE *fp = fopen(tmpPath.c_str(), "w");
if (fp == NULL) {
LOG(warning, "could not open '%s' for write", tmpPath.c_str());
return;
}
fprintf(fp, "%s\n", config.c_str());
fclose(fp);
rename(tmpPath.c_str(), path.c_str());
}
} // namespace <unnamed>
Wrapper::Wrapper(const std::string &configId)
: CfHandler(configId),
_childHandler()
{}
Wrapper::~Wrapper() = default;
void Wrapper::stop() {
_childHandler.stopChild();
}
void Wrapper::check() {
checkConfig();
if (_childHandler.checkChild()) {
LOG(error, "Fatal: child process died unexpectedly");
std::_Exit(EXIT_FAILURE);
}
}
void Wrapper::gotConfig(const OpenTelemetryConfig& config) {
_childHandler.stopChild();
std::string progPath = vespa::Defaults::underVespaHome("sbin/otelcol-contrib");
std::string cfPath = cfFilePath();
writeConfig(config.yaml, cfPath);
_childHandler.startChild(progPath, cfPath);
}
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