Removed curl dependency and use wt's http client instead (used to fetch data from AcousticBrainz)

README.md

@@ -44,7 +44,7 @@ The Subsonic API is enabled by default.
 ## Installation
 Here are the required packages to build LMS on Debian Stretch:
 ```sh
-apt-get install g++ autoconf automake libboost-filesystem-dev libboost-system-dev libavcodec-dev libavutil-dev libavformat-dev libav-tools libmagick++-dev libpstreams-dev libconfig++-dev libpstreams-dev ffmpeg libtag1-dev libcurl4-openssl-dev
+apt-get install g++ autoconf automake libboost-filesystem-dev libboost-system-dev libavcodec-dev libavutil-dev libavformat-dev libav-tools libmagick++-dev libpstreams-dev libconfig++-dev libpstreams-dev ffmpeg libtag1-dev
 ```
 
 You also need wt4, that is not packaged yet on Debian. See [installation instructions](https://www.webtoolkit.eu/wt/doc/reference/html/InstallationUnix.html). You may need to build Wt4 in "Release" mode if you want to compile it natively on a Raspberry Pi3B+.

configure.ac

@@ -16,7 +16,7 @@ fi
 AC_SUBST(MAGICKXX_CFLAGS)
 AC_SUBST(MAGICKXX_LIBS)
 
-AC_CHECK_HEADERS([Wt/WApplication.h pstreams/pstream.h curl/curl.h],
+AC_CHECK_HEADERS([Wt/WApplication.h pstreams/pstream.h],
                  [],
                  [AC_MSG_ERROR([Header not found or unusable !])])
 
@@ -81,11 +81,6 @@ AC_CHECK_LIB(	[config++],
 		,
 		[AC_MSG_ERROR([libconfig++ not found!])])
 
-AC_CHECK_LIB(	[curl],
-		[curl_easy_init],
-		,
-		[AC_MSG_ERROR([libcurl not found!])])
-
 AC_CONFIG_FILES([Makefile
 		 src/Makefile
 		 test/Makefile

src/similarity/features/AcousticBrainzUtils.cpp

@@ -21,7 +21,9 @@
 
 #include <boost/property_tree/ptree.hpp>
 #include <boost/property_tree/json_parser.hpp>
-#include <curl/curl.h>
+
+#include <Wt/WIOService.h>
+#include <Wt/Http/Client.h>
 
 #include "main/Service.hpp"
 #include "utils/Config.hpp"
@@ -31,63 +33,52 @@
 namespace AcousticBrainz
 {
 
-
-static size_t writeToOStringStream(void *buffer, size_t size, size_t nmemb, void* ctx)
-{
-	std::ostringstream& oss = *reinterpret_cast<std::ostringstream*>(ctx);
-
-	oss.write(reinterpret_cast<char*>(buffer), size * nmemb);
-
-	return size * nmemb;
-}
-
 static std::string
 getJsonData(const std::string& mbid)
 {
 	static const std::string defaultAPIURL = "https://acousticbrainz.org/api/v1/";
 
-	std::string data;
-	std::string url = getService<Config>()->getString("acousticbrainz-api-url", defaultAPIURL) + mbid + "/low-level";
+	const std::string url {getService<Config>()->getString("acousticbrainz-api-url", defaultAPIURL) + mbid + "/low-level"};
 
-	CURL *curl;
-	CURLcode res;
+	boost::asio::io_service ioService;
 
-	curl = curl_easy_init();
-	if (!curl)
+	Wt::Http::Client client {ioService};
+	client.setFollowRedirect(true);
+	client.setSslCertificateVerificationEnabled(true);
+	client.setMaximumResponseSize(256*1024);
+
+	if (!client.get(url))
 	{
-		LMS_LOG(SIMILARITY, ERROR) << "CURL init failed";
-		return data;
+		LMS_LOG(SIMILARITY, ERROR) << "Cannot perform a GET request to url '" << url << "'";
+		return {};
 	}
 
-	std::ostringstream oss;
-
-	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
-	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeToOStringStream);
-	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &oss);
-
-	res = curl_easy_perform(curl);
-	if (res != CURLE_OK)
+	std::string response;
+	client.done().connect([&](Wt::AsioWrapper::error_code ec, const Wt::Http::Message &msg)
 	{
-		LMS_LOG(SIMILARITY, ERROR) << "CURL perform failed: " << curl_easy_strerror(res);
-		return data;
-	}
+		if (ec)
+		{
+			LMS_LOG(SIMILARITY, ERROR) << "GET request to url '" << url << "' failed: " << ec.message();
+			return;
+		}
 
-	curl_easy_cleanup(curl);
+		if (msg.status() != 200)
+		{
+			LMS_LOG(SIMILARITY, ERROR) << "GET request to url '" << url << "' failed: status = " << msg.status() << ", body = " << msg.body();
+			return;
+		}
 
-	data = std::move(oss.str());
+		response = msg.body();
+	});
 
-	return data;
+	ioService.run();
+
+	return response;
 }
 
 std::string
 extractLowLevelFeatures(const std::string& mbid)
 {
-	if (boost::filesystem::exists("/storage/emeric/lms-dev/features/" + mbid))
-	{
-		std::ifstream ifs{std::string{"/storage/emeric/lms-dev/features/" + mbid}.c_str()};
-		return std::string {std::istreambuf_iterator<char>{ifs}, std::istreambuf_iterator<char>{}};
-	}
-
 	return getJsonData(mbid);
 }
 

src/similarity/features/SimilarityFeaturesScannerAddon.cpp

@@ -160,22 +160,22 @@ FeaturesScannerAddon::fetchFeatures(Database::IdType trackId, const std::string&
 	std::map<std::string, double> features;
 
 	LMS_LOG(DBUPDATER, DEBUG) << "Fetching low level features for track '" << MBID << "'";
-	std::string data {AcousticBrainz::extractLowLevelFeatures(MBID)};
+	const std::string data {AcousticBrainz::extractLowLevelFeatures(MBID)};
 	if (data.empty())
 	{
 		LMS_LOG(DBUPDATER, ERROR) << "Track " << trackId << ", MBID = '" << MBID << "': cannot extract features using AcousticBrainz";
 		return false;
 	}
 
-	auto uniqueTransaction {_dbSession->createUniqueTransaction()};
+	{
+		auto uniqueTransaction {_dbSession->createUniqueTransaction()};
 
-	Wt::Dbo::ptr<Database::Track> track {Database::Track::getById(*_dbSession, trackId)};
-	if (!track)
-		return false;
+		Wt::Dbo::ptr<Database::Track> track {Database::Track::getById(*_dbSession, trackId)};
+		if (!track)
+			return false;
 
-	LMS_LOG(DBUPDATER, DEBUG) << "Successfully extracted AcousticBrainz lowlevel features for track '" << track->getPath().string() << "'";
-
-	Database::TrackFeatures::create(*_dbSession, track, data);
+		Database::TrackFeatures::create(*_dbSession, track, data);
+	}
 
 	return true;
 }