1 files changed, 492 insertions, 0 deletions
diff --git a/src/input/SoupInputPlugin.cxx b/src/input/SoupInputPlugin.cxx
new file mode 100644
index 000000000..e9767c20e
--- /dev/null
+++ b/src/input/SoupInputPlugin.cxx
@@ -0,0 +1,492 @@
+/*
+ * Copyright (C) 2003-2013 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 "SoupInputPlugin.hxx"
+#include "InputPlugin.hxx"
+#include "InputStream.hxx"
+#include "InputInternal.hxx"
+#include "IOThread.hxx"
+#include "event/Loop.hxx"
+#include "conf.h"
+
+extern "C" {
+#include <libsoup/soup-uri.h>
+#include <libsoup/soup-session-async.h>
+}
+
+#include <assert.h>
+#include <string.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "input_soup"
+
+/**
+ * Do not buffer more than this number of bytes.  It should be a
+ * reasonable limit that doesn't make low-end machines suffer too
+ * much, but doesn't cause stuttering on high-latency lines.
+ */
+static const size_t SOUP_MAX_BUFFERED = 512 * 1024;
+
+/**
+ * Resume the stream at this number of bytes after it has been paused.
+ */
+static const size_t SOUP_RESUME_AT = 384 * 1024;
+
+static SoupURI *soup_proxy;
+static SoupSession *soup_session;
+
+struct SoupInputStream {
+	struct input_stream base;
+
+	SoupMessage *msg;
+
+	GQueue *buffers;
+
+	size_t current_consumed;
+
+	size_t total_buffered;
+
+	bool alive, pause, eof;
+
+	/**
+	 * Set when the session callback has been invoked, when it is
+	 * safe to free this object.
+	 */
+	bool completed;
+
+	GError *postponed_error;
+
+	SoupInputStream(const char *uri, Mutex &mutex, Cond &cond);
+	~SoupInputStream();
+
+	bool CopyError(const SoupMessage *msg);
+
+	bool WaitData();
+
+	size_t Read(void *ptr, size_t size, GError **error_r);
+};
+
+static inline GQuark
+soup_quark(void)
+{
+	return g_quark_from_static_string("soup");
+}
+
+static bool
+input_soup_init(const struct config_param *param, GError **error_r)
+{
+	assert(soup_proxy == NULL);
+	assert(soup_session == NULL);
+
+	g_type_init();
+
+	const char *proxy = config_get_block_string(param, "proxy", NULL);
+
+	if (proxy != NULL) {
+		soup_proxy = soup_uri_new(proxy);
+		if (soup_proxy == NULL) {
+			g_set_error(error_r, soup_quark(), 0,
+				    "failed to parse proxy setting");
+			return false;
+		}
+	}
+
+	soup_session =
+		soup_session_async_new_with_options(SOUP_SESSION_PROXY_URI,
+						    soup_proxy,
+						    SOUP_SESSION_ASYNC_CONTEXT,
+						    io_thread_get().GetContext(),
+						    NULL);
+
+	return true;
+}
+
+static void
+input_soup_finish(void)
+{
+	assert(soup_session != NULL);
+
+	soup_session_abort(soup_session);
+	g_object_unref(G_OBJECT(soup_session));
+
+	if (soup_proxy != NULL)
+		soup_uri_free(soup_proxy);
+}
+
+/**
+ * Copy the error from the SoupMessage object to
+ * input_soup::postponed_error.
+ *
+ * @return true if there was no error
+ */
+bool
+SoupInputStream::CopyError(const SoupMessage *src)
+{
+	if (SOUP_STATUS_IS_SUCCESSFUL(src->status_code))
+		return true;
+
+	if (src->status_code == SOUP_STATUS_CANCELLED)
+		/* failure, but don't generate a GError, because this
+		   status was caused by _close() */
+		return false;
+
+	if (postponed_error != nullptr)
+		/* there's already a GError, don't overwrite it */
+		return false;
+
+	if (SOUP_STATUS_IS_TRANSPORT_ERROR(src->status_code))
+		postponed_error =
+			g_error_new(soup_quark(), src->status_code,
+				    "HTTP client error: %s",
+				    src->reason_phrase);
+	else
+		postponed_error =
+			g_error_new(soup_quark(), src->status_code,
+				    "got HTTP status: %d %s",
+				    src->status_code, src->reason_phrase);
+
+	return false;
+}
+
+static void
+input_soup_session_callback(G_GNUC_UNUSED SoupSession *session,
+			    SoupMessage *msg, gpointer user_data)
+{
+	SoupInputStream *s = (SoupInputStream *)user_data;
+
+	assert(msg == s->msg);
+	assert(!s->completed);
+
+	const ScopeLock protect(s->base.mutex);
+
+	if (!s->base.ready)
+		s->CopyError(msg);
+
+	s->base.ready = true;
+	s->alive = false;
+	s->completed = true;
+
+	s->base.cond.broadcast();
+}
+
+static void
+input_soup_got_headers(SoupMessage *msg, gpointer user_data)
+{
+	SoupInputStream *s = (SoupInputStream *)user_data;
+
+	s->base.mutex.lock();
+
+	if (!s->CopyError(msg)) {
+		s->base.mutex.unlock();
+
+		soup_session_cancel_message(soup_session, msg,
+					    SOUP_STATUS_CANCELLED);
+		return;
+	}
+
+	s->base.ready = true;
+	s->base.cond.broadcast();
+	s->base.mutex.unlock();
+
+	soup_message_body_set_accumulate(msg->response_body, false);
+}
+
+static void
+input_soup_got_chunk(SoupMessage *msg, SoupBuffer *chunk, gpointer user_data)
+{
+	SoupInputStream *s = (SoupInputStream *)user_data;
+
+	assert(msg == s->msg);
+
+	const ScopeLock protect(s->base.mutex);
+
+	g_queue_push_tail(s->buffers, soup_buffer_copy(chunk));
+	s->total_buffered += chunk->length;
+
+	if (s->total_buffered >= SOUP_MAX_BUFFERED && !s->pause) {
+		s->pause = true;
+		soup_session_pause_message(soup_session, msg);
+	}
+
+	s->base.cond.broadcast();
+	s->base.mutex.unlock();
+}
+
+static void
+input_soup_got_body(G_GNUC_UNUSED SoupMessage *msg, gpointer user_data)
+{
+	SoupInputStream *s = (SoupInputStream *)user_data;
+
+	assert(msg == s->msg);
+
+	const ScopeLock protect(s->base.mutex);
+
+	s->base.ready = true;
+	s->eof = true;
+	s->alive = false;
+
+	s->base.cond.broadcast();
+	s->base.mutex.unlock();
+}
+
+inline bool
+SoupInputStream::WaitData()
+{
+	while (true) {
+		if (eof)
+			return true;
+
+		if (!alive)
+			return false;
+
+		if (!g_queue_is_empty(buffers))
+			return true;
+
+		assert(current_consumed == 0);
+
+		base.cond.wait(base.mutex);
+	}
+}
+
+static gpointer
+input_soup_queue(gpointer data)
+{
+	SoupInputStream *s = (SoupInputStream *)data;
+
+	soup_session_queue_message(soup_session, s->msg,
+				   input_soup_session_callback, s);
+
+	return NULL;
+}
+
+SoupInputStream::SoupInputStream(const char *uri,
+				 Mutex &mutex, Cond &cond)
+	:base(input_plugin_soup, uri, mutex, cond),
+	 buffers(g_queue_new()),
+	 current_consumed(0), total_buffered(0),
+	 alive(false), pause(false), eof(false), completed(false),
+	 postponed_error(nullptr)
+{
+#if GCC_CHECK_VERSION(4,6)
+#pragma GCC diagnostic push
+	/* the libsoup macro SOUP_METHOD_GET discards the "const"
+	   attribute of the g_intern_static_string() return value;
+	   don't make the gcc warning fatal: */
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
+
+	msg = soup_message_new(SOUP_METHOD_GET, uri);
+
+#if GCC_CHECK_VERSION(4,6)
+#pragma GCC diagnostic pop
+#endif
+
+	soup_message_set_flags(msg, SOUP_MESSAGE_NO_REDIRECT);
+
+	soup_message_headers_append(msg->request_headers, "User-Agent",
+				    "Music Player Daemon " VERSION);
+
+	g_signal_connect(msg, "got-headers",
+			 G_CALLBACK(input_soup_got_headers), this);
+	g_signal_connect(msg, "got-chunk",
+			 G_CALLBACK(input_soup_got_chunk), this);
+	g_signal_connect(msg, "got-body",
+			 G_CALLBACK(input_soup_got_body), this);
+
+	io_thread_call(input_soup_queue, this);
+}
+
+static struct input_stream *
+input_soup_open(const char *uri,
+		Mutex &mutex, Cond &cond,
+		G_GNUC_UNUSED GError **error_r)
+{
+	if (strncmp(uri, "http://", 7) != 0)
+		return NULL;
+
+	SoupInputStream *s = new SoupInputStream(uri, mutex, cond);
+	return &s->base;
+}
+
+static gpointer
+input_soup_cancel(gpointer data)
+{
+	SoupInputStream *s = (SoupInputStream *)data;
+
+	if (!s->completed)
+		soup_session_cancel_message(soup_session, s->msg,
+					    SOUP_STATUS_CANCELLED);
+
+	return NULL;
+}
+
+SoupInputStream::~SoupInputStream()
+{
+	base.mutex.lock();
+
+	if (!completed) {
+		/* the messages's session callback hasn't been invoked
+		   yet; cancel it and wait for completion */
+
+		base.mutex.unlock();
+
+		io_thread_call(input_soup_cancel, this);
+
+		base.mutex.lock();
+		while (!completed)
+			base.cond.wait(base.mutex);
+	}
+
+	base.mutex.unlock();
+
+	SoupBuffer *buffer;
+	while ((buffer = (SoupBuffer *)g_queue_pop_head(buffers)) != NULL)
+		soup_buffer_free(buffer);
+	g_queue_free(buffers);
+
+	if (postponed_error != NULL)
+		g_error_free(postponed_error);
+}
+
+static void
+input_soup_close(struct input_stream *is)
+{
+	SoupInputStream *s = (SoupInputStream *)is;
+
+	delete s;
+}
+
+static bool
+input_soup_check(struct input_stream *is, GError **error_r)
+{
+	SoupInputStream *s = (SoupInputStream *)is;
+
+	bool success = s->postponed_error == NULL;
+	if (!success) {
+		g_propagate_error(error_r, s->postponed_error);
+		s->postponed_error = NULL;
+	}
+
+	return success;
+}
+
+static bool
+input_soup_available(struct input_stream *is)
+{
+	SoupInputStream *s = (SoupInputStream *)is;
+
+	return s->eof || !s->alive || !g_queue_is_empty(s->buffers);
+}
+
+inline size_t
+SoupInputStream::Read(void *ptr, size_t size, GError **error_r)
+{
+	if (!WaitData()) {
+		assert(!alive);
+
+		if (postponed_error != nullptr) {
+			g_propagate_error(error_r, postponed_error);
+			postponed_error = nullptr;
+		} else
+			g_set_error_literal(error_r, soup_quark(), 0,
+					    "HTTP failure");
+		return 0;
+	}
+
+	char *p0 = (char *)ptr, *p = p0, *p_end = p0 + size;
+
+	while (p < p_end) {
+		SoupBuffer *buffer = (SoupBuffer *)
+			g_queue_pop_head(buffers);
+		if (buffer == NULL) {
+			assert(current_consumed == 0);
+			break;
+		}
+
+		assert(current_consumed < buffer->length);
+		assert(total_buffered >= buffer->length);
+
+		const char *q = buffer->data;
+		q += current_consumed;
+
+		size_t remaining = buffer->length - current_consumed;
+		size_t nbytes = p_end - p;
+		if (nbytes > remaining)
+			nbytes = remaining;
+
+		memcpy(p, q, nbytes);
+		p += nbytes;
+
+		current_consumed += remaining;
+		if (current_consumed >= buffer->length) {
+			/* done with this buffer */
+			total_buffered -= buffer->length;
+			soup_buffer_free(buffer);
+			current_consumed = 0;
+		} else {
+			/* partial read */
+			assert(p == p_end);
+
+			g_queue_push_head(buffers, buffer);
+		}
+	}
+
+	if (pause && total_buffered < SOUP_RESUME_AT) {
+		pause = false;
+		soup_session_unpause_message(soup_session, msg);
+	}
+
+	size_t nbytes = p - p0;
+	base.offset += nbytes;
+
+	return nbytes;
+}
+
+static size_t
+input_soup_read(struct input_stream *is, void *ptr, size_t size,
+		GError **error_r)
+{
+	SoupInputStream *s = (SoupInputStream *)is;
+
+	return s->Read(ptr, size, error_r);
+}
+
+static bool
+input_soup_eof(G_GNUC_UNUSED struct input_stream *is)
+{
+	SoupInputStream *s = (SoupInputStream *)is;
+
+	return !s->alive && g_queue_is_empty(s->buffers);
+}
+
+const struct input_plugin input_plugin_soup = {
+	"soup",
+	input_soup_init,
+	input_soup_finish,
+	input_soup_open,
+	input_soup_close,
+	input_soup_check,
+	nullptr,
+	nullptr,
+	input_soup_available,
+	input_soup_read,
+	input_soup_eof,
+	nullptr,
+};