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session.cc
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#include "session.h"
#include "user.h"
#include "search.h"
#include "track.h"
#include <pthread.h>
#include <signal.h>
#include <string>
#include <unistd.h>
typedef struct log_message {
struct log_message *next;
const char *message;
} log_message_t;
// userdata passed with a search query
typedef struct search_data {
Session *session;
Persistent<Function> *callback;
} search_data_t;
static Persistent<String> log_message_symbol;
// ----------------------------------------------------------------------------
// libspotify callbacks
static void SpotifyRunloopTimerProcess(EV_P_ ev_timer *w, int revents) {
Session *s = static_cast<Session*>(w->data);
s->ProcessEvents();
}
static void SpotifyRunloopAsyncProcess(EV_P_ ev_async *w, int revents) {
Session *s = static_cast<Session*>(w->data);
s->ProcessEvents();
}
static void NotifyMainThread(sp_session* session) {
// Called by a background thread (controlled by libspotify) when we need to
// query sp_session_process_events, which is handled by
// Session::ProcessEvents. ev_async_send queues a call on the main ev runloop.
Session* s = static_cast<Session*>(sp_session_userdata(session));
ev_async_send(EV_DEFAULT_UC_ s->runloop_async_);
}
void Session::ProcessEvents() {
int timeout = 0;
ev_timer_stop(EV_DEFAULT_UC_ runloop_timer_);
if (session_)
sp_session_process_events(session_, &timeout);
ev_timer_set(runloop_timer_, timeout / 1000.0, 0.0);
ev_timer_start(EV_DEFAULT_UC_ runloop_timer_);
}
void Session::DequeueLogMessages() {
while (!log_message_queue_.empty()) {
const char* message = log_message_queue_.front();
log_message_queue_.pop();
Local<Value> argv[] = { String::New(message) };
Emit(log_message_symbol, 1, argv);
delete message;
}
}
static void SpotifyRunloopAsyncLogMessage(EV_P_ ev_async *w, int revents) {
Session *s = static_cast<Session*>(w->data);
s->DequeueLogMessages();
}
static void LogMessage(sp_session* session, const char* data) {
Session* s = static_cast<Session*>(sp_session_userdata(session));
if (pthread_self() == s->main_thread_id_) {
// Called from the main runloop thread -- emit directly
Local<Value> argv[] = { String::New(data) };
s->Emit(log_message_symbol, 1, argv);
} else {
// Called from a background thread -- queue and notify
const char* message = strdup(data);
if (message == NULL)
return;
s->log_message_queue_.push(message);
// Signal we need to dequeue the message queue (handled by
// SpotifyRunloopAsyncLogMessage).
ev_async_send(EV_DEFAULT_UC_ s->logmsg_async_);
}
}
static void MessageToUser(sp_session* session, const char* data) {
Session* s = reinterpret_cast<Session*>(sp_session_userdata(session));
assert(s->main_thread_id_ == pthread_self() /* or we will crash */);
Local<Value> argv[] = { String::New(data) };
s->Emit(String::New("message_to_user"), 1, argv);
}
static void LoggedOut(sp_session* session) {
Session* s = reinterpret_cast<Session*>(sp_session_userdata(session));
assert(s->main_thread_id_ == pthread_self() /* or we will crash */);
if (s->logout_callback_) {
assert((*s->logout_callback_)->IsFunction());
(*s->logout_callback_)->Call(s->handle_, 0, NULL);
cb_destroy(s->logout_callback_);
s->logout_callback_ = NULL;
}
ev_unref(EV_DEFAULT_UC);
s->DequeueLogMessages();
}
static void LoggedIn(sp_session* session, sp_error error) {
Session* s = reinterpret_cast<Session*>(sp_session_userdata(session));
assert(s->login_callback_ != NULL);
assert((*s->login_callback_)->IsFunction());
assert(s->main_thread_id_ == pthread_self() /* or we will crash */);
if (error != SP_ERROR_OK) {
Local<Value> argv[] = {
Exception::Error(String::New(sp_error_message(error))) };
(*s->login_callback_)->Call(s->handle_, 1, argv);
} else {
(*s->login_callback_)->Call(s->handle_, 0, NULL);
}
cb_destroy(s->login_callback_);
s->login_callback_ = NULL;
}
static void MetadataUpdated(sp_session *session) {
Session* s = reinterpret_cast<Session*>(sp_session_userdata(session));
assert(s->main_thread_id_ == pthread_self() /* or we will crash */);
s->Emit(String::New("metadataUpdated"), 0, NULL);
s->metadata_update_queue_.process(s->session_, s->handle_);
}
static void ConnectionError(sp_session* session, sp_error error) {
Session* s = reinterpret_cast<Session*>(sp_session_userdata(session));
assert(s->main_thread_id_ == pthread_self() /* or we will crash */);
Local<Value> argv[] = { String::New(sp_error_message(error)) };
s->Emit(String::New("connection_error"), 1, argv);
}
static void SearchComplete(sp_search *search, void *userdata) {
search_data_t *sdata = static_cast<search_data_t*>(userdata);
Session *s = sdata->session;
assert((*sdata->callback)->IsFunction());
if (!search || sp_search_error(search) != SP_ERROR_OK) {
Local<Value> argv[] = {
Exception::Error(String::New(sp_error_message(sp_search_error(search))))
};
(*sdata->callback)->Call(s->handle_, 1, argv);
} else {
Handle<Value> argv[] = {
Undefined(),
SearchResult::New(s->session_, search)
};
(*sdata->callback)->Call(s->handle_, 2, argv);
}
cb_destroy(sdata->callback);
delete sdata;
}
// ----------------------------------------------------------------------------
// Session implementation
Session::Session(sp_session* session)
: session_(session)
, main_thread_id_((pthread_t) -1)
, login_callback_(NULL)
, logout_callback_(NULL)
, playlist_container_(NULL) {
runloop_timer_ = new ev_timer;
runloop_async_ = new ev_async;
logmsg_async_ = new ev_async;
}
Session::~Session() {
ev_timer_stop(EV_DEFAULT_UC_ runloop_timer_);
ev_async_stop(EV_DEFAULT_UC_ runloop_async_);
this->DequeueLogMessages();
if (playlist_container_) {
playlist_container_->Dispose();
delete playlist_container_;
playlist_container_ = NULL;
}
if (login_callback_) {
cb_destroy(login_callback_);
login_callback_ = NULL;
}
if (logout_callback_) {
cb_destroy(logout_callback_);
logout_callback_ = NULL;
}
delete runloop_timer_, runloop_async_, logmsg_async_;
}
Handle<Value> Session::New(const Arguments& args) {
Session* s = new Session(NULL);
static sp_session_callbacks callbacks = {
/* logged_in */ LoggedIn,
/* logged_out */ LoggedOut,
/* metadata_updated */ MetadataUpdated,
/* connection_error */ ConnectionError,
/* message_to_user */ MessageToUser,
/* notify_main_thread */ NotifyMainThread,
/* music_delivery */ NULL, // we don't play music
/* play_token_lost */ NULL, // we don't play music
/* log_message */ LogMessage,
/* end_of_track */ NULL, // we don't play music
};
sp_session_config config = {
/* api_version */ SPOTIFY_API_VERSION,
/* cache_location */ ".spotify-cache",
/* settings_location */ ".spotify-settings",
/* application_key */ NULL,
/* application_key_size */ 0,
/* user_agent */ "node-spotify",
/* callbacks */ &callbacks,
/* userdata */ s,
};
// appkey buffer
uint8_t *application_key = NULL;
if (args.Length() > 0) {
if (!args[0]->IsObject())
return JS_THROW(TypeError, "first argument must be an object");
Local<Object> configuration = args[0]->ToObject();
// applicationKey
if (configuration->Has(String::New("applicationKey"))) {
Local<Value> v = configuration->Get(String::New("applicationKey"));
if (!v->IsArray()) {
return JS_THROW(TypeError,
"applicationKey must be an array of integers");
}
Local<Array> a = Local<Array>::Cast(v);
application_key = new uint8_t[a->Length()];
config.application_key_size = a->Length();
for (int i = 0; i < a->Length(); i++) {
application_key[i] = a->Get(i)->Uint32Value();
}
config.application_key = application_key;
}
// userAgent
if (configuration->Has(String::New("userAgent"))) {
Handle<Value> v = configuration->Get(String::New("userAgent"));
String::Utf8Value vs(v);
config.user_agent = *vs;
}
// cacheLocation
if (configuration->Has(String::New("cacheLocation"))) {
Handle<Value> v = configuration->Get(String::New("cacheLocation"));
String::Utf8Value vs(v);
config.cache_location = *vs;
}
// settingsLocation
if (configuration->Has(String::New("settingsLocation"))) {
Handle<Value> v = configuration->Get(String::New("settingsLocation"));
String::Utf8Value vs(v);
config.settings_location = *vs;
}
}
// ev_async for libspotify background thread to invoke processing on main
s->runloop_async_->data = s;
ev_async_init(s->runloop_async_, SpotifyRunloopAsyncProcess);
ev_async_start(EV_DEFAULT_UC_ s->runloop_async_);
ev_unref(EV_DEFAULT_UC); // don't let a lingering async ev keep the main loop
// ev_timer for triggering libspotify periodic processing
s->runloop_timer_->data = s;
ev_timer_init(s->runloop_timer_, SpotifyRunloopTimerProcess, 60.0, 0.0);
ev_unref(EV_DEFAULT_UC);
// Note: No need to start the timer as it's started by first invocation after
// NotifyMainThread
// ev_async for libspotify background thread to emit log message on main
s->logmsg_async_->data = s;
ev_async_init(s->logmsg_async_, SpotifyRunloopAsyncLogMessage);
ev_async_start(EV_DEFAULT_UC_ s->logmsg_async_);
ev_unref(EV_DEFAULT_UC); // don't let a lingering async ev keep the main loop
sp_session* session;
sp_error error = sp_session_create(&config, &session);
if (error != SP_ERROR_OK)
return JS_THROW(Error, sp_error_message(error));
s->session_ = session;
s->main_thread_id_ = pthread_self();
s->Wrap(args.Holder());
return args.This();
}
Handle<Value> Session::Login(const Arguments& args) {
HandleScope scope;
if (args.Length() != 3)
return JS_THROW(TypeError, "login takes exactly 3 arguments");
if (!args[0]->IsString())
return JS_THROW(TypeError, "first argument must be a string");
if (!args[1]->IsString())
return JS_THROW(TypeError, "second argument must be a string");
if (!args[2]->IsFunction())
return JS_THROW(TypeError, "last argument must be a function");
Session* s = Unwrap<Session>(args.This());
String::Utf8Value username(args[0]);
String::Utf8Value password(args[1]);
// increase refcount for our timer event
ev_ref(EV_DEFAULT_UC);
// save login callback
if (s->login_callback_) cb_destroy(s->login_callback_);
s->login_callback_ = cb_persist(args[2]);
sp_session_login(s->session_, *username, *password);
return Undefined();
}
Handle<Value> Session::Logout(const Arguments& args) {
HandleScope scope;
if (args.Length() > 0 && !args[0]->IsFunction())
return JS_THROW(TypeError, "last argument must be a function");
Session* s = Unwrap<Session>(args.This());
// save logout callback
if (args.Length() > 0) {
if (s->logout_callback_) cb_destroy(s->logout_callback_);
s->logout_callback_ = cb_persist(args[0]);
}
sp_session_logout(s->session_);
return Undefined();
}
Handle<Value> Session::Search(const Arguments& args) {
HandleScope scope;
if (args.Length() != 2)
return JS_THROW(TypeError, "search takes exactly 2 arguments");
if (!args[0]->IsString() && !args[0]->IsObject())
return JS_THROW(TypeError, "first argument must be a string or an object");
if (!args[1]->IsFunction())
return JS_THROW(TypeError, "last argument must be a function");
Session* s = Unwrap<Session>(args.This());
const int kDefaultTrackOffset = 0;
const int kDefaultTrackCount = 10;
const int kDefaultAlbumOffset = 0;
const int kDefaultAlbumCount = 10;
const int kDefaultArtistOffset = 0;
const int kDefaultArtistCount = 10;
Handle<Value> query;
int track_offset;
int track_count;
int album_offset;
int album_count;
int artist_offset;
int artist_count;
if (args[0]->IsString()) {
query = args[0];
} else if (args[0]->IsObject()) {
Local<Object> opt = args[0]->ToObject();
Local<String> k = String::NewSymbol("query"); // todo: symbolize
if (!opt->Has(k))
return JS_THROW(TypeError, "missing required \"query\" parameter");
query = opt->Get(k);
#define IOPT(_name_, _intvar_, _default_)\
k = String::New(_name_);\
_intvar_ = opt->Has(k) ? opt->Get(k)->Uint32Value() : _default_;
IOPT("trackOffset", track_offset, kDefaultTrackOffset);
IOPT("trackCount", track_count, kDefaultTrackCount);
IOPT("albumOffset", album_offset, kDefaultAlbumOffset);
IOPT("albumCount", album_count, kDefaultAlbumOffset);
IOPT("artistOffset", artist_offset, kDefaultArtistOffset);
IOPT("artistCount", artist_count, kDefaultArtistCount);
#undef IOPT
}
search_data_t *search_data = new search_data_t;
search_data->session = s;
search_data->callback = cb_persist(args[1]);
String::Utf8Value query_str(query);
sp_search *search = sp_search_create(s->session_, *query_str,
track_offset, track_count,
album_offset, album_count,
artist_offset, artist_count,
&SearchComplete, search_data);
if (!search)
return JS_THROW(Error, "libspotify internal error when requesting search");
return Undefined();
}
// .getTrackByLink( link [, callback(err, track)] ) -> Track
Handle<Value> Session::GetTrackByLink(const Arguments& args) {
HandleScope scope;
if (args.Length() < 1)
return JS_THROW(TypeError, "getTrackByLink takes at least one argument");
if (args.Length() > 1) {
if (!args[1]->IsFunction())
return JS_THROW(TypeError, "last argument must be a function");
}
Session* s = Unwrap<Session>(args.This());
String::Utf8Value linkstr(args[0]);
// derive sp_link from string
sp_link *link = sp_link_create_from_string(*linkstr);
if (!link) {
return CallbackOrThrowError(s->handle_, args[1], "invalid link");
}
// derive sp_track from sp_link
sp_track *t = sp_link_as_track(link);
if (!t) {
return CallbackOrThrowError(s->handle_, args[1], "not a track link");
}
// check status
sp_error status = sp_track_error(t);
if (status != SP_ERROR_IS_LOADING && status != SP_ERROR_OK) {
return CallbackOrThrowError(s->handle_, args[1], status);
}
// create Track object
Handle<Value> track = Track::New(s->session_, t);
// "loaded" callback
if (args.Length() > 1) {
if (status == SP_ERROR_IS_LOADING) {
// pending
// todo: pass Handle<Value> instead of sp_track*
s->metadata_update_queue_.push(args[1], t);
} else if (status == SP_ERROR_OK) {
// loaded
Handle<Value> argv[] = { Undefined(), track };
Function::Cast(*args[1])->Call(s->handle_, 2, argv);
}
}
return scope.Close(track);
}
// ---------
// Properties
Handle<Value> Session::ConnectionStateGetter(Local<String> property,
const AccessorInfo& info) {
HandleScope scope;
Session* s = Unwrap<Session>(info.This());
int connectionstate = sp_session_connectionstate(s->session_);
return scope.Close(Integer::New(connectionstate));
}
Handle<Value> Session::PlaylistContainerGetter(Local<String> property,
const AccessorInfo& info) {
HandleScope scope;
Session* s = Unwrap<Session>(info.This());
if (!s->playlist_container_) {
sp_playlistcontainer *pc = sp_session_playlistcontainer(s->session_);
Handle<Value> playlist_container = PlaylistContainer::New(s->session_, pc);
s->playlist_container_ = new Persistent<Object>();
*s->playlist_container_ = Persistent<Object>::New(
Handle<Object>::Cast((*playlist_container)->ToObject()));
}
return *s->playlist_container_;
}
Handle<Value> Session::UserGetter(Local<String> property,
const AccessorInfo& info) {
HandleScope scope;
Session* s = Unwrap<Session>(info.This());
sp_user* user = sp_session_user(s->session_);
// The user property is exposed via a session object before the session
// is connected/logged in, in which case the user object isn't initialized
// and something weird has to be returned
if (!user)
return Undefined();
return scope.Close(User::NewInstance(user));
}
void Session::Initialize(Handle<Object> target) {
//printf("main T# %p\n", pthread_self());
HandleScope scope;
Local<FunctionTemplate> t = FunctionTemplate::New(New);
t->SetClassName(String::NewSymbol("Session"));
t->Inherit(EventEmitter::constructor_template);
NODE_SET_PROTOTYPE_METHOD(t, "logout", Logout);
NODE_SET_PROTOTYPE_METHOD(t, "login", Login);
NODE_SET_PROTOTYPE_METHOD(t, "search", Search);
NODE_SET_PROTOTYPE_METHOD(t, "getTrackByLink", GetTrackByLink);
Local<ObjectTemplate> instance_t = t->InstanceTemplate();
instance_t->SetInternalFieldCount(1);
instance_t->SetAccessor(String::New("user"), UserGetter);
instance_t->SetAccessor(String::New("_connectionState"),
ConnectionStateGetter);
instance_t->SetAccessor(String::New("playlists"), PlaylistContainerGetter);
target->Set(String::New("Session"), t->GetFunction());
log_message_symbol = NODE_PSYMBOL("logMessage");
}