diff options
Diffstat (limited to '')
| -rw-r--r-- | src/output/plugins/httpd/HttpdOutputPlugin.cxx | 601 |
1 files changed, 601 insertions, 0 deletions
diff --git a/src/output/plugins/httpd/HttpdOutputPlugin.cxx b/src/output/plugins/httpd/HttpdOutputPlugin.cxx new file mode 100644 index 000000000..e3ba7727d --- /dev/null +++ b/src/output/plugins/httpd/HttpdOutputPlugin.cxx @@ -0,0 +1,601 @@ +/* + * Copyright (C) 2003-2014 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 "HttpdOutputPlugin.hxx" +#include "HttpdInternal.hxx" +#include "HttpdClient.hxx" +#include "output/OutputAPI.hxx" +#include "encoder/EncoderPlugin.hxx" +#include "encoder/EncoderList.hxx" +#include "system/Resolver.hxx" +#include "Page.hxx" +#include "IcyMetaDataServer.hxx" +#include "system/fd_util.h" +#include "IOThread.hxx" +#include "event/Call.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "Log.hxx" + +#include <assert.h> + +#include <sys/types.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> + +#ifdef HAVE_LIBWRAP +#include <sys/socket.h> /* needed for AF_UNIX */ +#include <tcpd.h> +#endif + +const Domain httpd_output_domain("httpd_output"); + +inline +HttpdOutput::HttpdOutput(EventLoop &_loop) + :ServerSocket(_loop), DeferredMonitor(_loop), + base(httpd_output_plugin), + encoder(nullptr), unflushed_input(0), + metadata(nullptr) +{ +} + +HttpdOutput::~HttpdOutput() +{ + if (metadata != nullptr) + metadata->Unref(); + + if (encoder != nullptr) + encoder_finish(encoder); + +} + +inline bool +HttpdOutput::Bind(Error &error) +{ + open = false; + + bool result = false; + BlockingCall(GetEventLoop(), [this, &error, &result](){ + result = ServerSocket::Open(error); + }); + return result; +} + +inline void +HttpdOutput::Unbind() +{ + assert(!open); + + BlockingCall(GetEventLoop(), [this](){ + ServerSocket::Close(); + }); +} + +inline bool +HttpdOutput::Configure(const config_param ¶m, Error &error) +{ + /* read configuration */ + name = param.GetBlockValue("name", "Set name in config"); + genre = param.GetBlockValue("genre", "Set genre in config"); + website = param.GetBlockValue("website", "Set website in config"); + + unsigned port = param.GetBlockValue("port", 8000u); + + const char *encoder_name = + param.GetBlockValue("encoder", "vorbis"); + const auto encoder_plugin = encoder_plugin_get(encoder_name); + if (encoder_plugin == nullptr) { + error.Format(httpd_output_domain, + "No such encoder: %s", encoder_name); + return false; + } + + clients_max = param.GetBlockValue("max_clients", 0u); + + /* set up bind_to_address */ + + const char *bind_to_address = param.GetBlockValue("bind_to_address"); + bool success = bind_to_address != nullptr && + strcmp(bind_to_address, "any") != 0 + ? AddHost(bind_to_address, port, error) + : AddPort(port, error); + if (!success) + return false; + + /* initialize encoder */ + + encoder = encoder_init(*encoder_plugin, param, error); + if (encoder == nullptr) + return false; + + /* determine content type */ + content_type = encoder_get_mime_type(encoder); + if (content_type == nullptr) + content_type = "application/octet-stream"; + + return true; +} + +inline bool +HttpdOutput::Init(const config_param ¶m, Error &error) +{ + return base.Configure(param, error); +} + +static AudioOutput * +httpd_output_init(const config_param ¶m, Error &error) +{ + HttpdOutput *httpd = new HttpdOutput(io_thread_get()); + + AudioOutput *result = httpd->InitAndConfigure(param, error); + if (result == nullptr) + delete httpd; + + return result; +} + +static void +httpd_output_finish(AudioOutput *ao) +{ + HttpdOutput *httpd = HttpdOutput::Cast(ao); + + delete httpd; +} + +/** + * Creates a new #HttpdClient object and adds it into the + * HttpdOutput.clients linked list. + */ +inline void +HttpdOutput::AddClient(int fd) +{ + clients.emplace_front(*this, fd, GetEventLoop(), + encoder->plugin.tag == nullptr); + ++clients_cnt; + + /* pass metadata to client */ + if (metadata != nullptr) + clients.front().PushMetaData(metadata); +} + +void +HttpdOutput::RunDeferred() +{ + /* this method runs in the IOThread; it broadcasts pages from + our own queue to all clients */ + + const ScopeLock protect(mutex); + + while (!pages.empty()) { + Page *page = pages.front(); + pages.pop(); + + for (auto &client : clients) + client.PushPage(page); + + page->Unref(); + } + + /* wake up the client that may be waiting for the queue to be + flushed */ + cond.broadcast(); +} + +void +HttpdOutput::OnAccept(int fd, const sockaddr &address, + size_t address_length, gcc_unused int uid) +{ + /* the listener socket has become readable - a client has + connected */ + +#ifdef HAVE_LIBWRAP + if (address.sa_family != AF_UNIX) { + const auto hostaddr = sockaddr_to_string(&address, + address_length); + // TODO: shall we obtain the program name from argv[0]? + const char *progname = "mpd"; + + struct request_info req; + request_init(&req, RQ_FILE, fd, RQ_DAEMON, progname, 0); + + fromhost(&req); + + if (!hosts_access(&req)) { + /* tcp wrappers says no */ + FormatWarning(httpd_output_domain, + "libwrap refused connection (libwrap=%s) from %s", + progname, hostaddr.c_str()); + close_socket(fd); + return; + } + } +#else + (void)address; + (void)address_length; +#endif /* HAVE_WRAP */ + + const ScopeLock protect(mutex); + + if (fd >= 0) { + /* can we allow additional client */ + if (open && (clients_max == 0 || clients_cnt < clients_max)) + AddClient(fd); + else + close_socket(fd); + } else if (fd < 0 && errno != EINTR) { + LogErrno(httpd_output_domain, "accept() failed"); + } +} + +Page * +HttpdOutput::ReadPage() +{ + if (unflushed_input >= 65536) { + /* we have fed a lot of input into the encoder, but it + didn't give anything back yet - flush now to avoid + buffer underruns */ + encoder_flush(encoder, IgnoreError()); + unflushed_input = 0; + } + + size_t size = 0; + do { + size_t nbytes = encoder_read(encoder, + buffer + size, + sizeof(buffer) - size); + if (nbytes == 0) + break; + + unflushed_input = 0; + + size += nbytes; + } while (size < sizeof(buffer)); + + if (size == 0) + return nullptr; + + return Page::Copy(buffer, size); +} + +static bool +httpd_output_enable(AudioOutput *ao, Error &error) +{ + HttpdOutput *httpd = HttpdOutput::Cast(ao); + + return httpd->Bind(error); +} + +static void +httpd_output_disable(AudioOutput *ao) +{ + HttpdOutput *httpd = HttpdOutput::Cast(ao); + + httpd->Unbind(); +} + +inline bool +HttpdOutput::OpenEncoder(AudioFormat &audio_format, Error &error) +{ + if (!encoder_open(encoder, audio_format, error)) + return false; + + /* we have to remember the encoder header, i.e. the first + bytes of encoder output after opening it, because it has to + be sent to every new client */ + header = ReadPage(); + + unflushed_input = 0; + + return true; +} + +inline bool +HttpdOutput::Open(AudioFormat &audio_format, Error &error) +{ + assert(!open); + assert(clients.empty()); + + /* open the encoder */ + + if (!OpenEncoder(audio_format, error)) + return false; + + /* initialize other attributes */ + + clients_cnt = 0; + timer = new Timer(audio_format); + + open = true; + + return true; +} + +static bool +httpd_output_open(AudioOutput *ao, AudioFormat &audio_format, + Error &error) +{ + HttpdOutput *httpd = HttpdOutput::Cast(ao); + + const ScopeLock protect(httpd->mutex); + return httpd->Open(audio_format, error); +} + +inline void +HttpdOutput::Close() +{ + assert(open); + + open = false; + + delete timer; + + BlockingCall(GetEventLoop(), [this](){ + clients.clear(); + }); + + if (header != nullptr) + header->Unref(); + + encoder_close(encoder); +} + +static void +httpd_output_close(AudioOutput *ao) +{ + HttpdOutput *httpd = HttpdOutput::Cast(ao); + + const ScopeLock protect(httpd->mutex); + httpd->Close(); +} + +void +HttpdOutput::RemoveClient(HttpdClient &client) +{ + assert(clients_cnt > 0); + + for (auto prev = clients.before_begin(), i = std::next(prev);; + prev = i, i = std::next(prev)) { + assert(i != clients.end()); + if (&*i == &client) { + clients.erase_after(prev); + clients_cnt--; + break; + } + } +} + +void +HttpdOutput::SendHeader(HttpdClient &client) const +{ + if (header != nullptr) + client.PushPage(header); +} + +inline unsigned +HttpdOutput::Delay() const +{ + if (!LockHasClients() && base.pause) { + /* if there's no client and this output is paused, + then httpd_output_pause() will not do anything, it + will not fill the buffer and it will not update the + timer; therefore, we reset the timer here */ + timer->Reset(); + + /* some arbitrary delay that is long enough to avoid + consuming too much CPU, and short enough to notice + new clients quickly enough */ + return 1000; + } + + return timer->IsStarted() + ? timer->GetDelay() + : 0; +} + +static unsigned +httpd_output_delay(AudioOutput *ao) +{ + HttpdOutput *httpd = HttpdOutput::Cast(ao); + + return httpd->Delay(); +} + +void +HttpdOutput::BroadcastPage(Page *page) +{ + assert(page != nullptr); + + mutex.lock(); + pages.push(page); + page->Ref(); + mutex.unlock(); + + DeferredMonitor::Schedule(); +} + +void +HttpdOutput::BroadcastFromEncoder() +{ + /* synchronize with the IOThread */ + mutex.lock(); + while (!pages.empty()) + cond.wait(mutex); + + Page *page; + while ((page = ReadPage()) != nullptr) + pages.push(page); + + mutex.unlock(); + + DeferredMonitor::Schedule(); +} + +inline bool +HttpdOutput::EncodeAndPlay(const void *chunk, size_t size, Error &error) +{ + if (!encoder_write(encoder, chunk, size, error)) + return false; + + unflushed_input += size; + + BroadcastFromEncoder(); + return true; +} + +inline size_t +HttpdOutput::Play(const void *chunk, size_t size, Error &error) +{ + if (LockHasClients()) { + if (!EncodeAndPlay(chunk, size, error)) + return 0; + } + + if (!timer->IsStarted()) + timer->Start(); + timer->Add(size); + + return size; +} + +static size_t +httpd_output_play(AudioOutput *ao, const void *chunk, size_t size, + Error &error) +{ + HttpdOutput *httpd = HttpdOutput::Cast(ao); + + return httpd->Play(chunk, size, error); +} + +static bool +httpd_output_pause(AudioOutput *ao) +{ + HttpdOutput *httpd = HttpdOutput::Cast(ao); + + if (httpd->LockHasClients()) { + static const char silence[1020] = { 0 }; + return httpd_output_play(ao, silence, sizeof(silence), + IgnoreError()) > 0; + } else { + return true; + } +} + +inline void +HttpdOutput::SendTag(const Tag *tag) +{ + assert(tag != nullptr); + + if (encoder->plugin.tag != nullptr) { + /* embed encoder tags */ + + /* flush the current stream, and end it */ + + encoder_pre_tag(encoder, IgnoreError()); + BroadcastFromEncoder(); + + /* send the tag to the encoder - which starts a new + stream now */ + + encoder_tag(encoder, tag, IgnoreError()); + + /* the first page generated by the encoder will now be + used as the new "header" page, which is sent to all + new clients */ + + Page *page = ReadPage(); + if (page != nullptr) { + if (header != nullptr) + header->Unref(); + header = page; + BroadcastPage(page); + } + } else { + /* use Icy-Metadata */ + + if (metadata != nullptr) + metadata->Unref(); + + static constexpr TagType types[] = { + TAG_ALBUM, TAG_ARTIST, TAG_TITLE, + TAG_NUM_OF_ITEM_TYPES + }; + + metadata = icy_server_metadata_page(*tag, &types[0]); + if (metadata != nullptr) { + const ScopeLock protect(mutex); + for (auto &client : clients) + client.PushMetaData(metadata); + } + } +} + +static void +httpd_output_tag(AudioOutput *ao, const Tag *tag) +{ + HttpdOutput *httpd = HttpdOutput::Cast(ao); + + httpd->SendTag(tag); +} + +inline void +HttpdOutput::CancelAllClients() +{ + const ScopeLock protect(mutex); + + while (!pages.empty()) { + Page *page = pages.front(); + pages.pop(); + page->Unref(); + } + + for (auto &client : clients) + client.CancelQueue(); + + cond.broadcast(); +} + +static void +httpd_output_cancel(AudioOutput *ao) +{ + HttpdOutput *httpd = HttpdOutput::Cast(ao); + + BlockingCall(io_thread_get(), [httpd](){ + httpd->CancelAllClients(); + }); +} + +const struct AudioOutputPlugin httpd_output_plugin = { + "httpd", + nullptr, + httpd_output_init, + httpd_output_finish, + httpd_output_enable, + httpd_output_disable, + httpd_output_open, + httpd_output_close, + httpd_output_delay, + httpd_output_tag, + httpd_output_play, + nullptr, + httpd_output_cancel, + httpd_output_pause, + nullptr, +}; |