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lib_logrotate.cpp
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lib_logrotate.cpp
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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 <unistd.h>
#include <map>
#include <string>
#include <mesos/mesos.hpp>
#include <mesos/module/container_logger.hpp>
#include <mesos/slave/container_logger.hpp>
#include <mesos/slave/containerizer.hpp>
#include <process/dispatch.hpp>
#include <process/future.hpp>
#include <process/process.hpp>
#include <process/subprocess.hpp>
#include <stout/bytes.hpp>
#include <stout/error.hpp>
#include <stout/try.hpp>
#include <stout/none.hpp>
#include <stout/nothing.hpp>
#include <stout/path.hpp>
#include <stout/strings.hpp>
#include <stout/os/constants.hpp>
#include <stout/os/environment.hpp>
#include <stout/os/fcntl.hpp>
#include <stout/os/killtree.hpp>
#include <stout/os/pipe.hpp>
#ifdef __linux__
#include "linux/systemd.hpp"
#endif // __linux__
#include "slave/container_loggers/logrotate.hpp"
#include "slave/container_loggers/lib_logrotate.hpp"
using namespace mesos;
using namespace process;
using std::array;
using std::map;
using std::string;
using mesos::slave::ContainerConfig;
using mesos::slave::ContainerLogger;
using mesos::slave::ContainerIO;
namespace mesos {
namespace internal {
namespace logger {
class LogrotateContainerLoggerProcess :
public Process<LogrotateContainerLoggerProcess>
{
public:
LogrotateContainerLoggerProcess(const Flags& _flags) : flags(_flags) {}
// Spawns two subprocesses that read from their stdin and write to
// "stdout" and "stderr" files in the sandbox. The subprocesses will rotate
// the files according to the configured maximum size and number of files.
Future<ContainerIO> prepare(
const ContainerID& containerId,
const ContainerConfig& containerConfig)
{
// Prepare the environment for the container logger subprocess.
// We inherit agent environment variables except for those
// LIBPROCESS or MESOS prefixed environment variables. See MESOS-6747.
map<string, string> environment;
foreachpair (
const string& key, const string& value, os::environment()) {
if (!strings::startsWith(key, "LIBPROCESS_") &&
!strings::startsWith(key, "MESOS_")) {
environment.emplace(key, value);
}
}
// Make sure the libprocess of the subprocess can properly
// initialize and find the IP. Since we don't need to use the TCP
// socket for communication, it's OK to use a local address.
environment.emplace("LIBPROCESS_IP", "127.0.0.1");
// Use the number of worker threads for libprocess that was passed
// in through the flags.
CHECK_GT(flags.libprocess_num_worker_threads, 0u);
environment["LIBPROCESS_NUM_WORKER_THREADS"] =
stringify(flags.libprocess_num_worker_threads);
// Copy the global rotation flags.
// These will act as the defaults in case the container's environment
// overrides a subset of them.
LoggerFlags overriddenFlags;
overriddenFlags.max_stdout_size = flags.max_stdout_size;
overriddenFlags.logrotate_stdout_options = flags.logrotate_stdout_options;
overriddenFlags.max_stderr_size = flags.max_stderr_size;
overriddenFlags.logrotate_stderr_options = flags.logrotate_stderr_options;
// Check for overrides of the rotation settings in the
// `CommandInfo`s environment variables.
if (containerConfig.command_info().has_environment()) {
// Search the environment for prefixed environment variables.
// We un-prefix those variables before parsing the flag values.
map<string, string> containerEnvironment;
foreach (const Environment::Variable& variable,
containerConfig.command_info().environment().variables()) {
if (strings::startsWith(
variable.name(), flags.environment_variable_prefix)) {
string unprefixed = strings::lower(strings::remove(
variable.name(),
flags.environment_variable_prefix,
strings::PREFIX));
containerEnvironment[unprefixed] = variable.value();
}
}
// We will error out if there are unknown flags with the same prefix.
Try<flags::Warnings> load = overriddenFlags.load(containerEnvironment);
if (load.isError()) {
return Failure(
"Failed to load container logger settings: " + load.error());
}
// Log any flag warnings.
foreach (const flags::Warning& warning, load->warnings) {
LOG(WARNING) << warning.message;
}
}
// NOTE: We manually construct a pipe here instead of using
// `Subprocess::PIPE` so that the ownership of the FDs is properly
// represented. The `Subprocess` spawned below owns the read-end
// of the pipe and will be solely responsible for closing that end.
// The ownership of the write-end will be passed to the caller
// of this function.
Try<array<int, 2>> pipefd = os::pipe();
if (pipefd.isError()) {
return Failure("Failed to create pipe: " + pipefd.error());
}
Subprocess::IO::InputFileDescriptors outfds;
outfds.read = pipefd->at(0);
outfds.write = pipefd->at(1);
// Spawn a process to handle stdout.
mesos::internal::logger::rotate::Flags outFlags;
outFlags.max_size = overriddenFlags.max_stdout_size;
outFlags.logrotate_options = overriddenFlags.logrotate_stdout_options;
outFlags.log_filename = path::join(containerConfig.directory(), "stdout");
outFlags.logrotate_path = flags.logrotate_path;
outFlags.user = containerConfig.has_user()
? Option<string>(containerConfig.user())
: Option<string>::none();
// If we are on systemd, then extend the life of the process as we
// do with the executor. Any grandchildren's lives will also be
// extended.
std::vector<Subprocess::ParentHook> parentHooks;
#ifdef __linux__
if (systemd::enabled()) {
parentHooks.emplace_back(Subprocess::ParentHook(
&systemd::mesos::extendLifetime));
}
#endif // __linux__
Try<Subprocess> outProcess = subprocess(
path::join(flags.launcher_dir, mesos::internal::logger::rotate::NAME),
{mesos::internal::logger::rotate::NAME},
Subprocess::FD(outfds.read, Subprocess::IO::OWNED),
Subprocess::PATH(os::DEV_NULL),
Subprocess::FD(STDERR_FILENO),
&outFlags,
environment,
None(),
parentHooks);
if (outProcess.isError()) {
os::close(outfds.write.get());
return Failure("Failed to create logger process: " + outProcess.error());
}
// NOTE: We manually construct a pipe here to properly express
// ownership of the FDs. See the NOTE above.
pipefd = os::pipe();
if (pipefd.isError()) {
os::close(outfds.write.get());
os::killtree(outProcess->pid(), SIGKILL);
return Failure("Failed to create pipe: " + pipefd.error());
}
Subprocess::IO::InputFileDescriptors errfds;
errfds.read = pipefd->at(0);
errfds.write = pipefd->at(1);
// Spawn a process to handle stderr.
mesos::internal::logger::rotate::Flags errFlags;
errFlags.max_size = overriddenFlags.max_stderr_size;
errFlags.logrotate_options = overriddenFlags.logrotate_stderr_options;
errFlags.log_filename = path::join(containerConfig.directory(), "stderr");
errFlags.logrotate_path = flags.logrotate_path;
errFlags.user = containerConfig.has_user()
? Option<string>(containerConfig.user())
: Option<string>::none();
Try<Subprocess> errProcess = subprocess(
path::join(flags.launcher_dir, mesos::internal::logger::rotate::NAME),
{mesos::internal::logger::rotate::NAME},
Subprocess::FD(errfds.read, Subprocess::IO::OWNED),
Subprocess::PATH(os::DEV_NULL),
Subprocess::FD(STDERR_FILENO),
&errFlags,
environment,
None(),
parentHooks);
if (errProcess.isError()) {
os::close(outfds.write.get());
os::close(errfds.write.get());
os::killtree(outProcess->pid(), SIGKILL);
return Failure("Failed to create logger process: " + errProcess.error());
}
// NOTE: The ownership of these FDs is given to the caller of this function.
ContainerIO io;
io.out = ContainerIO::IO::FD(outfds.write.get());
io.err = ContainerIO::IO::FD(errfds.write.get());
return io;
}
protected:
Flags flags;
};
LogrotateContainerLogger::LogrotateContainerLogger(const Flags& _flags)
: flags(_flags),
process(new LogrotateContainerLoggerProcess(flags))
{
// Spawn and pass validated parameters to the process.
spawn(process.get());
}
LogrotateContainerLogger::~LogrotateContainerLogger()
{
terminate(process.get());
wait(process.get());
}
Try<Nothing> LogrotateContainerLogger::initialize()
{
return Nothing();
}
Future<ContainerIO> LogrotateContainerLogger::prepare(
const ContainerID& containerId,
const ContainerConfig& containerConfig)
{
return dispatch(
process.get(),
&LogrotateContainerLoggerProcess::prepare,
containerId,
containerConfig);
}
} // namespace logger {
} // namespace internal {
} // namespace mesos {
mesos::modules::Module<ContainerLogger>
org_apache_mesos_LogrotateContainerLogger(
MESOS_MODULE_API_VERSION,
MESOS_VERSION,
"Apache Mesos",
"modules@mesos.apache.org",
"Logrotate Container Logger module.",
nullptr,
[](const Parameters& parameters) -> ContainerLogger* {
// Convert `parameters` into a map.
map<string, string> values;
foreach (const Parameter& parameter, parameters.parameter()) {
values[parameter.key()] = parameter.value();
}
// Load and validate flags from the map.
mesos::internal::logger::Flags flags;
Try<flags::Warnings> load = flags.load(values);
if (load.isError()) {
LOG(ERROR) << "Failed to parse parameters: " << load.error();
return nullptr;
}
// Log any flag warnings.
foreach (const flags::Warning& warning, load->warnings) {
LOG(WARNING) << warning.message;
}
return new mesos::internal::logger::LogrotateContainerLogger(flags);
});