fix ClientRetrieve with CAR exporting & add test coverage

Signed-off-by: Ignacio Hagopian <jsign.uy@gmail.com>

api/test/deals.go

@@ -11,13 +11,20 @@ import (
 	"testing"
 	"time"
 
+	"github.com/ipfs/go-car"
+	files "github.com/ipfs/go-ipfs-files"
 	logging "github.com/ipfs/go-log/v2"
 
 	"github.com/filecoin-project/go-fil-markets/storagemarket"
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/build"
+	dag "github.com/ipfs/go-merkledag"
+	dstest "github.com/ipfs/go-merkledag/test"
+	unixfile "github.com/ipfs/go-unixfs/file"
+
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/node/impl"
+	ipld "github.com/ipfs/go-ipld-format"
 )
 
 func init() {
@@ -25,7 +32,7 @@ func init() {
 	build.InsecurePoStValidation = true
 }
 
-func TestDealFlow(t *testing.T, b APIBuilder, blocktime time.Duration) {
+func TestDealFlow(t *testing.T, b APIBuilder, blocktime time.Duration, carExport bool) {
 	os.Setenv("BELLMAN_NO_GPU", "1")
 
 	ctx := context.Background()
@@ -133,7 +140,7 @@ loop:
 
 	ref := api.FileRef{
 		Path:  filepath.Join(rpath, "ret"),
-		IsCAR: false,
+		IsCAR: carExport,
 	}
 	err = client.ClientRetrieve(ctx, offers[0].Order(caddr), ref)
 	if err != nil {
@@ -145,6 +152,35 @@ loop:
 		t.Fatal(err)
 	}
 
+	if carExport {
+		bserv := dstest.Bserv()
+		ch, err := car.LoadCar(bserv.Blockstore(), bytes.NewReader(rdata))
+		if err != nil {
+			t.Fatal(err)
+		}
+		b, err := bserv.GetBlock(ctx, ch.Roots[0])
+		if err != nil {
+			t.Fatal(err)
+		}
+		nd, err := ipld.Decode(b)
+		if err != nil {
+			t.Fatal(err)
+		}
+		dserv := dag.NewDAGService(bserv)
+		fil, err := unixfile.NewUnixfsFile(ctx, dserv, nd)
+		if err != nil {
+			t.Fatal(err)
+		}
+		outPath := filepath.Join(rpath, "retLoadedCAR")
+		if err := files.WriteTo(fil, outPath); err != nil {
+			t.Fatal(err)
+		}
+		rdata, err = ioutil.ReadFile(outPath)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+
 	if !bytes.Equal(rdata, data) {
 		t.Fatal("wrong data retrieved")
 	}

node/impl/client/client.go

@@ -377,7 +377,7 @@ func (a *API) ClientRetrieve(ctx context.Context, order api.RetrievalOrder, ref
 	unsubscribe()
 
 	if ref.IsCAR {
-		f, err := os.Open(ref.Path)
+		f, err := os.OpenFile(ref.Path, os.O_CREATE|os.O_WRONLY, 0644)
 		if err != nil {
 			return err
 		}

node/node_test.go

@@ -4,14 +4,15 @@ import (
 	"bytes"
 	"context"
 	"crypto/rand"
-	"github.com/filecoin-project/lotus/lib/lotuslog"
-	"github.com/filecoin-project/lotus/storage/mockstorage"
-	"github.com/filecoin-project/sector-storage/ffiwrapper"
 	"io/ioutil"
 	"net/http/httptest"
 	"testing"
 	"time"
 
+	"github.com/filecoin-project/lotus/lib/lotuslog"
+	"github.com/filecoin-project/lotus/storage/mockstorage"
+	"github.com/filecoin-project/sector-storage/ffiwrapper"
+
 	"github.com/filecoin-project/go-fil-markets/storedcounter"
 	"github.com/ipfs/go-datastore"
 	logging "github.com/ipfs/go-log/v2"
@@ -43,7 +44,7 @@ import (
 	"github.com/filecoin-project/lotus/node/modules"
 	modtest "github.com/filecoin-project/lotus/node/modules/testing"
 	"github.com/filecoin-project/lotus/node/repo"
-	"github.com/filecoin-project/sector-storage"
+	sectorstorage "github.com/filecoin-project/sector-storage"
 	"github.com/filecoin-project/sector-storage/mock"
 )
 
@@ -449,7 +450,11 @@ func TestAPIDealFlow(t *testing.T) {
 	logging.SetLogLevel("sub", "ERROR")
 	logging.SetLogLevel("storageminer", "ERROR")
 
-	test.TestDealFlow(t, mockSbBuilder, 10*time.Millisecond)
+	test.TestDealFlow(t, mockSbBuilder, 10*time.Millisecond, false)
+
+	t.Run("WithExportedCAR", func(t *testing.T) {
+		test.TestDealFlow(t, mockSbBuilder, 10*time.Millisecond, true)
+	})
 }
 
 func TestAPIDealFlowReal(t *testing.T) {
@@ -463,5 +468,5 @@ func TestAPIDealFlowReal(t *testing.T) {
 	logging.SetLogLevel("sub", "ERROR")
 	logging.SetLogLevel("storageminer", "ERROR")
 
-	test.TestDealFlow(t, builder, time.Second)
+	test.TestDealFlow(t, builder, time.Second, false)
 }