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contentprovider.go
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contentprovider.go
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package contentprovider
import (
"context"
"crypto/rand"
"encoding/base64"
"fmt"
"io"
"net/http"
"os"
"time"
"github.com/data-preservation-programs/singularity/util"
"github.com/fxamacker/cbor/v2"
nilrouting "github.com/ipfs/go-ipfs-routing/none"
bsnetwork "github.com/ipfs/go-libipfs/bitswap/network"
"github.com/ipfs/go-libipfs/bitswap/server"
"github.com/libp2p/go-libp2p"
"github.com/libp2p/go-libp2p/core/crypto"
"github.com/libp2p/go-libp2p/core/host"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/multiformats/go-multiaddr"
"github.com/data-preservation-programs/singularity/datasource"
"github.com/data-preservation-programs/singularity/model"
"github.com/data-preservation-programs/singularity/store"
"github.com/ipfs/go-cid"
logging "github.com/ipfs/go-log/v2"
"github.com/labstack/echo/v4"
"github.com/labstack/echo/v4/middleware"
"github.com/pkg/errors"
"gorm.io/gorm"
)
var logger = logging.Logger("contentprovider")
func GenerateNewPeer() ([]byte, []byte, peer.ID, error) {
private, public, err := crypto.GenerateEd25519Key(rand.Reader)
if err != nil {
return nil, nil, "", errors.Wrap(err, "cannot generate new peer")
}
peerID, err := peer.IDFromPublicKey(public)
if err != nil {
return nil, nil, "", errors.Wrap(err, "cannot generate peer id")
}
privateBytes, err := crypto.MarshalPrivateKey(private)
if err != nil {
return nil, nil, "", errors.Wrap(err, "cannot marshal private key")
}
publicBytes, err := crypto.MarshalPublicKey(public)
if err != nil {
return nil, nil, "", errors.Wrap(err, "cannot marshal public key")
}
return privateBytes, publicBytes, peerID, nil
}
type ContentProviderService struct {
Resolver datasource.HandlerResolver
DB *gorm.DB
bind string
host host.Host
}
type ContentProviderConfig struct {
EnableHTTP bool
HTTPBind string
EnableBitswap bool
Libp2pIdentityKey string
Libp2pListenAddrs []string
}
func NewContentProviderService(db *gorm.DB, config ContentProviderConfig) (*ContentProviderService, error) {
bind := ""
if config.EnableHTTP {
bind = config.HTTPBind
}
if config.EnableBitswap {
var private []byte
if config.Libp2pIdentityKey == "" {
var err error
private, _, _, err = GenerateNewPeer()
if err != nil {
return nil, err
}
} else {
var err error
private, err = base64.StdEncoding.DecodeString(config.Libp2pIdentityKey)
if err != nil {
return nil, err
}
}
identityKey, err := crypto.UnmarshalPrivateKey(private)
if err != nil {
return nil, err
}
var listenAddrs []multiaddr.Multiaddr
for _, addr := range config.Libp2pListenAddrs {
ma, err := multiaddr.NewMultiaddr(addr)
if err != nil {
return nil, err
}
listenAddrs = append(listenAddrs, ma)
}
h, err := util.InitHost([]libp2p.Option{libp2p.Identity(identityKey)}, listenAddrs...)
if err != nil {
return nil, err
}
for _, m := range h.Addrs() {
logging.Logger("contentprovider").Info("listening on " + m.String())
}
logging.Logger("contentprovider").Info("peerID: " + h.ID().String())
return &ContentProviderService{DB: db, bind: bind, Resolver: datasource.DefaultHandlerResolver{}, host: h}, nil
}
return &ContentProviderService{DB: db, bind: bind, Resolver: datasource.DefaultHandlerResolver{}}, nil
}
func (s *ContentProviderService) StartBitswap(ctx context.Context) error {
nilRouter, err := nilrouting.ConstructNilRouting(ctx, nil, nil, nil)
if err != nil {
return err
}
net := bsnetwork.NewFromIpfsHost(s.host, nilRouter)
bs := store.ItemReferenceBlockStore{DB: s.DB, HandlerResolver: datasource.DefaultHandlerResolver{}}
bsserver := server.New(ctx, net, bs)
net.Start(bsserver)
return nil
}
func (s *ContentProviderService) Start(ctx context.Context) error {
if s.host != nil {
err := s.StartBitswap(ctx)
if err != nil {
logger.Fatal(err)
}
}
if s.bind != "" {
e := echo.New()
e.Use(middleware.GzipWithConfig(middleware.GzipConfig{}))
e.Use(
middleware.RequestLoggerWithConfig(
middleware.RequestLoggerConfig{
LogStatus: true,
LogURI: true,
LogValuesFunc: func(c echo.Context, v middleware.RequestLoggerValues) error {
uri := v.URI
status := v.Status
latency := time.Since(v.StartTime)
err := v.Error
method := c.Request().Method
if err != nil {
logger.With(
"status",
status,
"latency_ms",
latency.Milliseconds(),
"err",
err,
).Error(method + " " + uri)
} else {
logger.With("status", status, "latency_ms", latency.Milliseconds()).Info(method + " " + uri)
}
return nil
},
},
),
)
e.Use(middleware.RecoverWithConfig(middleware.RecoverConfig{
Skipper: middleware.DefaultSkipper,
StackSize: 4 << 10, // 4 KB
DisableStackAll: false,
DisablePrintStack: false,
LogLevel: 0,
LogErrorFunc: func(c echo.Context, err error, stack []byte) error {
logger.Errorw("panic", "err", err, "stack", string(stack))
return nil
},
}))
e.GET("/piece/metadata/:id", s.GetMetadataHandler)
e.HEAD("/piece/metadata/:id", s.GetMetadataHandler)
e.GET("/piece/:id", s.handleGetPiece)
e.HEAD("/piece/:id", s.handleGetPiece)
e.GET("/ipfs/:cid", s.handleGetCid)
go func() {
<-ctx.Done()
shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 5*time.Second)
defer shutdownCancel()
//nolint:contextcheck
if err := e.Shutdown(shutdownCtx); err != nil {
fmt.Printf("Error shutting down the server: %v\n", err)
}
}()
err := e.Start(s.bind)
if err != nil {
return err
}
}
<-ctx.Done()
return nil
}
func GetMetadataHandler(c echo.Context, db *gorm.DB) error {
id := c.Param("id")
pieceCid, err := cid.Parse(id)
if err != nil {
return c.String(http.StatusBadRequest, "failed to parse piece CID: "+err.Error())
}
var car model.Car
ctx := c.Request().Context()
err = db.WithContext(ctx).Where("piece_cid = ?", model.CID(pieceCid)).First(&car).Error
if errors.Is(err, gorm.ErrRecordNotFound) {
return c.String(http.StatusNotFound, "piece not found")
}
metadata, err := GetPieceMetadata(ctx, db, car)
if err != nil {
return c.String(http.StatusInternalServerError, fmt.Sprintf("Error: %s", err.Error()))
}
// Remove all relevant credentials
metadata.Source.Metadata = nil
acceptHeader := c.Request().Header.Get("Accept")
switch acceptHeader {
case "application/cbor":
c.Response().WriteHeader(http.StatusOK)
c.Response().Header().Set("Content-Type", "application/cbor")
encoder := cbor.NewEncoder(c.Response().Writer)
return encoder.Encode(metadata)
default:
return c.JSON(http.StatusOK, metadata)
}
}
func (s *ContentProviderService) GetMetadataHandler(c echo.Context) error {
return GetMetadataHandler(c, s.DB)
}
type PieceMetadata struct {
Car model.Car `json:"car"`
Source model.Source `json:"source"`
CarBlocks []model.CarBlock `json:"carBlocks"`
Items []model.Item `json:"items"`
}
func GetPieceMetadata(ctx context.Context, db *gorm.DB, car model.Car) (*PieceMetadata, error) {
var source model.Source
err := db.WithContext(ctx).Where("id = ?", car.SourceID).Find(&source).Error
if err != nil {
return nil, fmt.Errorf("failed to query for source: %w", err)
}
var carBlocks []model.CarBlock
err = db.WithContext(ctx).Where("car_id = ?", car.ID).
Find(&carBlocks).Error
if err != nil {
return nil, fmt.Errorf("failed to query for CAR blocks: %w", err)
}
itemIDSet := make(map[uint64]struct{})
for _, carBlock := range carBlocks {
if carBlock.ItemID != nil {
itemIDSet[*carBlock.ItemID] = struct{}{}
}
}
var itemIDs []uint64
for itemID := range itemIDSet {
itemIDs = append(itemIDs, itemID)
}
var items []model.Item
err = db.WithContext(ctx).Where("id IN ?", itemIDs).Find(&items).Error
if err != nil {
return nil, fmt.Errorf("failed to query for items: %w", err)
}
return &PieceMetadata{
Car: car,
Source: source,
CarBlocks: carBlocks,
Items: items,
}, nil
}
func (s *ContentProviderService) GetPieceMetadata(ctx context.Context, car model.Car) (*PieceMetadata, error) {
return GetPieceMetadata(ctx, s.DB, car)
}
func (s *ContentProviderService) FindPiece(ctx context.Context, pieceCid cid.Cid) (
io.ReadSeekCloser,
time.Time,
error,
) {
var cars []model.Car
err := s.DB.WithContext(ctx).Where("piece_cid = ?", model.CID(pieceCid)).Find(&cars).Error
if err != nil {
return nil, time.Time{}, fmt.Errorf("failed to query for CARs: %w", err)
}
if len(cars) == 0 {
return nil, time.Time{}, os.ErrNotExist
}
for _, car := range cars {
if car.FilePath == "" {
continue
}
file, err := os.Open(car.FilePath)
if err != nil {
continue
}
fileInfo, err := file.Stat()
if err != nil {
file.Close()
continue
}
return file, fileInfo.ModTime(), nil
}
car := cars[0]
metadata, err := s.GetPieceMetadata(ctx, car)
if err != nil {
return nil, time.Time{}, fmt.Errorf("failed to get piece metadata: %w", err)
}
reader, err := store.NewPieceReader(ctx, metadata.Car, metadata.Source, metadata.CarBlocks, metadata.Items, s.Resolver)
if err != nil {
return nil, time.Time{}, fmt.Errorf("failed to create piece reader: %w", err)
}
return reader, car.CreatedAt, nil
}
func (s *ContentProviderService) setCommonHeaders(c echo.Context, pieceCid string) {
c.Response().Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", pieceCid+".car"))
c.Response().Header().Set("Content-Type", "application/vnd.ipld.car; version=1")
c.Response().Header().Set("Accept-Ranges", "bytes")
c.Response().Header().Set("Etag", "\""+pieceCid+"\"")
}
func (s *ContentProviderService) handleGetCid(c echo.Context) error {
id := c.Param("cid")
cid, err := cid.Parse(id)
if err != nil {
return c.String(http.StatusBadRequest, "failed to parse CID: "+err.Error())
}
var item model.Item
err = s.DB.WithContext(c.Request().Context()).Preload("Source").Where("cid = ?", cid.String()).First(&item).Error
if errors.Is(err, gorm.ErrRecordNotFound) {
return c.String(http.StatusNotFound, "CID not found")
}
handler, err := s.Resolver.Resolve(c.Request().Context(), *item.Source)
if err != nil {
return c.String(http.StatusInternalServerError, "failed to get handler: "+err.Error())
}
handle, _, err := handler.Read(c.Request().Context(), item.Path, 0, item.Size)
if err != nil {
return c.String(http.StatusInternalServerError, "failed to open handler: "+err.Error())
}
defer handle.Close()
return c.Stream(http.StatusOK, "application/octet-stream", handle)
}
func (s *ContentProviderService) handleGetPiece(c echo.Context) error {
id := c.Param("id")
pieceCid, err := cid.Parse(id)
if err != nil {
return c.String(http.StatusBadRequest, "failed to parse piece CID: "+err.Error())
}
reader, lastModified, err := s.FindPiece(c.Request().Context(), pieceCid)
if os.IsNotExist(err) {
return c.String(http.StatusNotFound, "piece not found")
}
if err != nil {
return c.String(http.StatusInternalServerError, "failed to find piece: "+err.Error())
}
defer reader.Close()
s.setCommonHeaders(c, pieceCid.String())
http.ServeContent(
c.Response(),
c.Request(),
pieceCid.String()+".car",
lastModified,
reader,
)
return nil
}