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/*
* Copyright 2003-2019 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "TagSave.hxx"
#include "tag/Tag.hxx"
#include "ConfigGlue.hxx"
#include "input/InputStream.hxx"
#include "input/Init.hxx"
#include "input/Registry.hxx"
#include "input/InputPlugin.hxx"
#include "input/RemoteTagScanner.hxx"
#include "input/ScanTags.hxx"
#include "event/Thread.hxx"
#include "thread/Cond.hxx"
#include "Log.hxx"
#include "LogBackend.hxx"
#include "fs/Path.hxx"
#include "fs/NarrowPath.hxx"
#include "fs/io/BufferedOutputStream.hxx"
#include "fs/io/StdioOutputStream.hxx"
#include "util/ConstBuffer.hxx"
#include "util/OptionDef.hxx"
#include "util/OptionParser.hxx"
#include "util/PrintException.hxx"
#ifdef ENABLE_ARCHIVE
#include "archive/ArchiveList.hxx"
#endif
#include <stdexcept>
#include <unistd.h>
#include <stdlib.h>
struct CommandLine {
const char *uri = nullptr;
FromNarrowPath config_path;
bool verbose = false;
bool scan = false;
};
enum Option {
OPTION_CONFIG,
OPTION_VERBOSE,
OPTION_SCAN,
};
static constexpr OptionDef option_defs[] = {
{"config", 0, true, "Load a MPD configuration file"},
{"verbose", 'v', false, "Verbose logging"},
{"scan", 0, false, "Scan tags instead of reading raw data"},
};
static CommandLine
ParseCommandLine(int argc, char **argv)
{
CommandLine c;
OptionParser option_parser(option_defs, argc, argv);
while (auto o = option_parser.Next()) {
switch (Option(o.index)) {
case OPTION_CONFIG:
c.config_path = o.value;
break;
case OPTION_VERBOSE:
c.verbose = true;
break;
case OPTION_SCAN:
c.scan = true;
break;
}
}
auto args = option_parser.GetRemaining();
if (args.size != 1)
throw std::runtime_error("Usage: run_input [--verbose] [--config=FILE] URI");
c.uri = args.front();
return c;
}
class GlobalInit {
const ConfigData config;
EventThread io_thread;
#ifdef ENABLE_ARCHIVE
const ScopeArchivePluginsInit archive_plugins_init;
#endif
const ScopeInputPluginsInit input_plugins_init;
public:
explicit GlobalInit(Path config_path)
:config(AutoLoadConfigFile(config_path)),
input_plugins_init(config, io_thread.GetEventLoop())
{
io_thread.Start();
}
};
static void
tag_save(FILE *file, const Tag &tag)
{
StdioOutputStream sos(file);
BufferedOutputStream bos(sos);
tag_save(bos, tag);
bos.Flush();
}
static int
dump_input_stream(InputStream *is)
{
const std::lock_guard<Mutex> protect(is->mutex);
/* print meta data */
if (is->HasMimeType())
fprintf(stderr, "MIME type: %s\n", is->GetMimeType());
/* read data and tags from the stream */
while (!is->IsEOF()) {
{
auto tag = is->ReadTag();
if (tag) {
fprintf(stderr, "Received a tag:\n");
tag_save(stderr, *tag);
}
}
char buffer[4096];
size_t num_read = is->Read(buffer, sizeof(buffer));
if (num_read == 0)
break;
ssize_t num_written = write(1, buffer, num_read);
if (num_written <= 0)
break;
}
is->Check();
return 0;
}
class DumpRemoteTagHandler final : public RemoteTagHandler {
Mutex mutex;
Cond cond;
Tag tag;
std::exception_ptr error;
bool done = false;
public:
Tag Wait() {
const std::lock_guard<Mutex> lock(mutex);
while (!done)
cond.wait(mutex);
if (error)
std::rethrow_exception(error);
return std::move(tag);
}
/* virtual methods from RemoteTagHandler */
void OnRemoteTag(Tag &&_tag) noexcept override {
const std::lock_guard<Mutex> lock(mutex);
tag = std::move(_tag);
done = true;
cond.broadcast();
}
void OnRemoteTagError(std::exception_ptr e) noexcept override {
const std::lock_guard<Mutex> lock(mutex);
error = std::move(e);
done = true;
cond.broadcast();
}
};
static int
Scan(const char *uri)
{
DumpRemoteTagHandler handler;
auto scanner = InputScanTags(uri, handler);
if (!scanner) {
fprintf(stderr, "Unsupported URI\n");
return EXIT_FAILURE;
}
scanner->Start();
tag_save(stdout, handler.Wait());
return EXIT_SUCCESS;
}
int main(int argc, char **argv)
try {
const auto c = ParseCommandLine(argc, argv);
/* initialize MPD */
SetLogThreshold(c.verbose ? LogLevel::DEBUG : LogLevel::INFO);
const GlobalInit init(c.config_path);
if (c.scan)
return Scan(c.uri);
/* open the stream and dump it */
Mutex mutex;
auto is = InputStream::OpenReady(c.uri, mutex);
return dump_input_stream(is.get());
} catch (...) {
PrintException(std::current_exception());
return EXIT_FAILURE;
}
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