307 lines
9.0 KiB
Go
307 lines
9.0 KiB
Go
package server
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"time"
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"git.netflux.io/rob/clipper/config"
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pbmediaset "git.netflux.io/rob/clipper/generated/pb/media_set"
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"git.netflux.io/rob/clipper/media"
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"github.com/google/uuid"
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grpcmiddleware "github.com/grpc-ecosystem/go-grpc-middleware"
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grpczap "github.com/grpc-ecosystem/go-grpc-middleware/logging/zap"
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grpcrecovery "github.com/grpc-ecosystem/go-grpc-middleware/recovery"
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"github.com/improbable-eng/grpc-web/go/grpcweb"
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"go.uber.org/zap"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"google.golang.org/protobuf/types/known/durationpb"
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)
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const (
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// ts-proto generates code that automatically retries for a subset of gRPC
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// response codes. To avoid invoking this behaviour, default to returning a
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// Cancelled code for now.
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// See https://github.com/stephenh/ts-proto/blob/459b94f5b2988d58d186461332e888c3e511603a/src/generate-grpc-web.ts#L293
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// and https://github.com/stephenh/ts-proto/pull/131.
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defaultResponseCode = codes.Canceled
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defaultResponseMessage = "An unexpected error occurred"
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)
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const (
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getAudioTimeout = time.Minute * 5
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getAudioSegmentTimeout = time.Second * 10
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getVideoTimeout = time.Minute * 5
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)
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type ResponseError struct {
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err error
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s string
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}
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func (r *ResponseError) Error() string {
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return fmt.Sprintf("unexpected error: %v", r.err.Error())
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}
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func (r *ResponseError) Unwrap() error {
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return r.err
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}
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func (r *ResponseError) GRPCStatus() *status.Status {
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return status.New(defaultResponseCode, r.s)
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}
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func newResponseError(err error) *ResponseError {
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return &ResponseError{err: err, s: defaultResponseMessage}
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}
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type Options struct {
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Config config.Config
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Timeout time.Duration
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Store media.Store
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YoutubeClient media.YoutubeClient
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FileStore media.FileStore
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Logger *zap.Logger
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}
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// mediaSetServiceController implements gRPC controller for MediaSetService
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type mediaSetServiceController struct {
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pbmediaset.UnimplementedMediaSetServiceServer
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mediaSetService *media.MediaSetService
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logger *zap.SugaredLogger
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}
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// Get returns a pbMediaSet.MediaSet
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func (c *mediaSetServiceController) Get(ctx context.Context, request *pbmediaset.GetRequest) (*pbmediaset.MediaSet, error) {
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mediaSet, err := c.mediaSetService.Get(ctx, request.GetYoutubeId())
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if err != nil {
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return nil, newResponseError(err)
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}
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result := pbmediaset.MediaSet{
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Id: mediaSet.ID.String(),
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YoutubeId: mediaSet.YoutubeID,
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AudioChannels: int32(mediaSet.Audio.Channels),
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AudioFrames: mediaSet.Audio.Frames,
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AudioApproxFrames: mediaSet.Audio.ApproxFrames,
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AudioSampleRate: int32(mediaSet.Audio.SampleRate),
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AudioYoutubeItag: int32(mediaSet.Audio.YoutubeItag),
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AudioMimeType: mediaSet.Audio.MimeType,
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VideoDuration: durationpb.New(mediaSet.Video.Duration),
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VideoYoutubeItag: int32(mediaSet.Video.YoutubeItag),
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VideoMimeType: mediaSet.Video.MimeType,
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}
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return &result, nil
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}
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// GetAudio returns a stream of GetAudioProgress relating to the entire audio
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// part of the MediaSet.
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func (c *mediaSetServiceController) GetAudio(request *pbmediaset.GetAudioRequest, stream pbmediaset.MediaSetService_GetAudioServer) error {
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// TODO: reduce timeout when fetching from S3
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ctx, cancel := context.WithTimeout(context.Background(), getAudioTimeout)
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defer cancel()
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id, err := uuid.Parse(request.GetId())
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if err != nil {
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return newResponseError(err)
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}
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reader, err := c.mediaSetService.GetAudio(ctx, id, int(request.GetNumBins()))
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if err != nil {
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return newResponseError(err)
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}
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for {
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progress, err := reader.Next()
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if err != nil && err != io.EOF {
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return newResponseError(err)
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}
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peaks := make([]int32, len(progress.Peaks))
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for i, p := range progress.Peaks {
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peaks[i] = int32(p)
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}
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progressPb := pbmediaset.GetAudioProgress{
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PercentComplete: progress.PercentComplete,
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Url: progress.URL,
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Peaks: peaks,
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}
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stream.Send(&progressPb)
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if err == io.EOF {
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break
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}
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}
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return nil
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}
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// GetAudioSegment returns a set of peaks for a segment of an audio part of a
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// MediaSet.
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func (c *mediaSetServiceController) GetAudioSegment(ctx context.Context, request *pbmediaset.GetAudioSegmentRequest) (*pbmediaset.GetAudioSegmentResponse, error) {
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ctx, cancel := context.WithTimeout(ctx, getAudioSegmentTimeout)
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defer cancel()
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id, err := uuid.Parse(request.GetId())
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if err != nil {
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return nil, newResponseError(err)
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}
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peaks, err := c.mediaSetService.GetAudioSegment(ctx, id, request.StartFrame, request.EndFrame, int(request.GetNumBins()))
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if err != nil {
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return nil, newResponseError(err)
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}
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peaks32 := make([]int32, len(peaks))
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for i, p := range peaks {
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peaks32[i] = int32(p)
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}
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response := pbmediaset.GetAudioSegmentResponse{
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Peaks: peaks32,
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}
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return &response, nil
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}
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func (c *mediaSetServiceController) GetVideo(request *pbmediaset.GetVideoRequest, stream pbmediaset.MediaSetService_GetVideoServer) error {
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// TODO: reduce timeout when already fetched from Youtube
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ctx, cancel := context.WithTimeout(context.Background(), getVideoTimeout)
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defer cancel()
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id, err := uuid.Parse(request.GetId())
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if err != nil {
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return newResponseError(err)
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}
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reader, err := c.mediaSetService.GetVideo(ctx, id)
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if err != nil {
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return newResponseError(err)
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}
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for {
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progress, err := reader.Next()
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if err != nil && err != io.EOF {
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return newResponseError(err)
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}
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progressPb := pbmediaset.GetVideoProgress{
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PercentComplete: progress.PercentComplete,
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Url: progress.URL,
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}
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stream.Send(&progressPb)
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if err == io.EOF {
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break
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}
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}
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return nil
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}
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func (c *mediaSetServiceController) GetVideoThumbnail(ctx context.Context, request *pbmediaset.GetVideoThumbnailRequest) (*pbmediaset.GetVideoThumbnailResponse, error) {
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id, err := uuid.Parse(request.GetId())
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if err != nil {
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return nil, newResponseError(err)
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}
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thumbnail, err := c.mediaSetService.GetVideoThumbnail(ctx, id)
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if err != nil {
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return nil, newResponseError(err)
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}
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response := pbmediaset.GetVideoThumbnailResponse{
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Image: thumbnail.Data,
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Width: int32(thumbnail.Width),
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Height: int32(thumbnail.Height),
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}
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return &response, nil
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}
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func Start(options Options) error {
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fetchMediaSetService := media.NewMediaSetService(
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options.Store,
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options.YoutubeClient,
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options.FileStore,
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options.Config,
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options.Logger.Sugar().Named("mediaSetService"),
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)
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grpcServer, err := buildGRPCServer(options.Config, options.Logger)
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if err != nil {
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return fmt.Errorf("error building server: %v", err)
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}
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mediaSetController := &mediaSetServiceController{mediaSetService: fetchMediaSetService, logger: options.Logger.Sugar().Named("controller")}
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pbmediaset.RegisterMediaSetServiceServer(grpcServer, mediaSetController)
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// TODO: configure CORS
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grpcWebServer := grpcweb.WrapServer(grpcServer, grpcweb.WithOriginFunc(func(string) bool { return true }))
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log := options.Logger.Sugar()
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fileHandler := http.NotFoundHandler()
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// Enabling the file system store disables serving assets over HTTP.
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// TODO: fix this.
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if options.Config.AssetsHTTPBasePath != "" {
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log.With("basePath", options.Config.AssetsHTTPBasePath).Info("Configured to serve assets over HTTP")
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fileHandler = http.FileServer(http.Dir(options.Config.AssetsHTTPBasePath))
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}
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if options.Config.FileStoreHTTPBasePath != "" {
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log.With("basePath", options.Config.FileStoreHTTPBasePath).Info("Configured to serve file store over HTTP")
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fileHandler = http.FileServer(http.Dir(options.Config.FileStoreHTTPBasePath))
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}
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httpServer := http.Server{
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Addr: options.Config.BindAddr,
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ReadTimeout: options.Timeout,
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WriteTimeout: options.Timeout,
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Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if !grpcWebServer.IsGrpcWebRequest(r) && !grpcWebServer.IsAcceptableGrpcCorsRequest(r) {
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fileHandler.ServeHTTP(w, r)
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return
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}
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grpcWebServer.ServeHTTP(w, r)
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}),
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}
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log.Infof("Listening at %s", options.Config.BindAddr)
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if options.Config.TLSCertFile != "" && options.Config.TLSKeyFile != "" {
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return httpServer.ListenAndServeTLS(options.Config.TLSCertFile, options.Config.TLSKeyFile)
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}
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return httpServer.ListenAndServe()
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}
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func buildGRPCServer(c config.Config, logger *zap.Logger) (*grpc.Server, error) {
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unaryInterceptors := []grpc.UnaryServerInterceptor{
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grpczap.UnaryServerInterceptor(logger),
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}
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streamInterceptors := []grpc.StreamServerInterceptor{
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grpczap.StreamServerInterceptor(logger),
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}
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if c.Environment == config.EnvProduction {
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panicOpts := []grpcrecovery.Option{
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grpcrecovery.WithRecoveryHandler(func(p interface{}) error {
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return newResponseError(fmt.Errorf("%v", p))
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}),
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}
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unaryInterceptors = append(unaryInterceptors, grpcrecovery.UnaryServerInterceptor(panicOpts...))
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streamInterceptors = append(streamInterceptors, grpcrecovery.StreamServerInterceptor(panicOpts...))
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}
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return grpc.NewServer(
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grpc.StreamInterceptor(grpcmiddleware.ChainStreamServer(streamInterceptors...)),
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grpc.UnaryInterceptor(grpcmiddleware.ChainUnaryServer(unaryInterceptors...)),
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), nil
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}
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