swarm/storage: fix T.Fatal inside a goroutine

swarm/storage/netstore_test.go

@@ -20,6 +20,8 @@ import (
 	"bytes"
 	"context"
 	"crypto/rand"
+	"errors"
+	"fmt"
 	"io/ioutil"
 	"sync"
 	"testing"
@@ -114,19 +116,24 @@ func TestNetStoreGetAndPut(t *testing.T) {
 	defer cancel()
 
 	c := make(chan struct{}) // this channel ensures that the gouroutine with the Put does not run earlier than the Get
+	putErrC := make(chan error)
 	go func() {
 		<-c                                // wait for the Get to be called
 		time.Sleep(200 * time.Millisecond) // and a little more so it is surely called
 
 		// check if netStore created a fetcher in the Get call for the unavailable chunk
 		if netStore.fetchers.Len() != 1 || netStore.getFetcher(chunk.Address()) == nil {
-			t.Fatal("Expected netStore to use a fetcher for the Get call")
+			putErrC <- errors.New("Expected netStore to use a fetcher for the Get call")
+			return
 		}
 
 		err := netStore.Put(ctx, chunk)
 		if err != nil {
-			t.Fatalf("Expected no err got %v", err)
+			putErrC <- fmt.Errorf("Expected no err got %v", err)
+			return
 		}
+
+		putErrC <- nil
 	}()
 
 	close(c)
@@ -134,6 +141,10 @@ func TestNetStoreGetAndPut(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Expected no err got %v", err)
 	}
+
+	if err := <-putErrC; err != nil {
+		t.Fatal(err)
+	}
 	// the retrieved chunk should be the same as what we Put
 	if !bytes.Equal(recChunk.Address(), chunk.Address()) || !bytes.Equal(recChunk.Data(), chunk.Data()) {
 		t.Fatalf("Different chunk received than what was put")
@@ -200,14 +211,18 @@ func TestNetStoreGetTimeout(t *testing.T) {
 	defer cancel()
 
 	c := make(chan struct{}) // this channel ensures that the gouroutine does not run earlier than the Get
+	fetcherErrC := make(chan error)
 	go func() {
 		<-c                                // wait for the Get to be called
 		time.Sleep(200 * time.Millisecond) // and a little more so it is surely called
 
 		// check if netStore created a fetcher in the Get call for the unavailable chunk
 		if netStore.fetchers.Len() != 1 || netStore.getFetcher(chunk.Address()) == nil {
-			t.Fatal("Expected netStore to use a fetcher for the Get call")
+			fetcherErrC <- errors.New("Expected netStore to use a fetcher for the Get call")
+			return
 		}
+
+		fetcherErrC <- nil
 	}()
 
 	close(c)
@@ -220,6 +235,10 @@ func TestNetStoreGetTimeout(t *testing.T) {
 		t.Fatalf("Expected context.DeadLineExceeded err got %v", err)
 	}
 
+	if err := <-fetcherErrC; err != nil {
+		t.Fatal(err)
+	}
+
 	// A fetcher was created, check if it has been removed after timeout
 	if netStore.fetchers.Len() != 0 {
 		t.Fatal("Expected netStore to remove the fetcher after timeout")
@@ -243,20 +262,29 @@ func TestNetStoreGetCancel(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
 
 	c := make(chan struct{}) // this channel ensures that the gouroutine with the cancel does not run earlier than the Get
+	fetcherErrC := make(chan error, 1)
 	go func() {
 		<-c                                // wait for the Get to be called
 		time.Sleep(200 * time.Millisecond) // and a little more so it is surely called
 		// check if netStore created a fetcher in the Get call for the unavailable chunk
 		if netStore.fetchers.Len() != 1 || netStore.getFetcher(chunk.Address()) == nil {
-			t.Fatal("Expected netStore to use a fetcher for the Get call")
+			fetcherErrC <- errors.New("Expected netStore to use a fetcher for the Get call")
+			return
 		}
+
+		fetcherErrC <- nil
 		cancel()
 	}()
 
 	close(c)
+
 	// We call Get with an unavailable chunk, so it will create a fetcher and wait for delivery
 	_, err := netStore.Get(ctx, chunk.Address())
 
+	if err := <-fetcherErrC; err != nil {
+		t.Fatal(err)
+	}
+
 	// After the context is cancelled above Get should return with an error
 	if err != context.Canceled {
 		t.Fatalf("Expected context.Canceled err got %v", err)
@@ -286,46 +314,55 @@ func TestNetStoreMultipleGetAndPut(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
 	defer cancel()
 
+	putErrC := make(chan error)
 	go func() {
 		// sleep to make sure Put is called after all the Get
 		time.Sleep(500 * time.Millisecond)
 		// check if netStore created exactly one fetcher for all Get calls
 		if netStore.fetchers.Len() != 1 {
-			t.Fatal("Expected netStore to use one fetcher for all Get calls")
+			putErrC <- errors.New("Expected netStore to use one fetcher for all Get calls")
+			return
 		}
 		err := netStore.Put(ctx, chunk)
 		if err != nil {
-			t.Fatalf("Expected no err got %v", err)
+			putErrC <- fmt.Errorf("Expected no err got %v", err)
+			return
 		}
+		putErrC <- nil
 	}()
 
+	count := 4
 	// call Get 4 times for the same unavailable chunk. The calls will be blocked until the Put above.
-	getWG := sync.WaitGroup{}
+	errC := make(chan error)
-	for i := 0; i < 4; i++ {
+	for i := 0; i < count; i++ {
-		getWG.Add(1)
 		go func() {
-			defer getWG.Done()
 			recChunk, err := netStore.Get(ctx, chunk.Address())
 			if err != nil {
-				t.Fatalf("Expected no err got %v", err)
+				errC <- fmt.Errorf("Expected no err got %v", err)
 			}
 			if !bytes.Equal(recChunk.Address(), chunk.Address()) || !bytes.Equal(recChunk.Data(), chunk.Data()) {
-				t.Fatalf("Different chunk received than what was put")
+				errC <- errors.New("Different chunk received than what was put")
 			}
+			errC <- nil
 		}()
 	}
 
-	finishedC := make(chan struct{})
+	if err := <-putErrC; err != nil {
-	go func() {
+		t.Fatal(err)
-		getWG.Wait()
+	}
-		close(finishedC)
+
-	}()
+	timeout := time.After(1 * time.Second)
 
 	// The Get calls should return after Put, so no timeout expected
-	select {
+	for i := 0; i < count; i++ {
-	case <-finishedC:
+		select {
-	case <-time.After(1 * time.Second):
+		case err := <-errC:
-		t.Fatalf("Timeout waiting for Get calls to return")
+			if err != nil {
+				t.Fatal(err)
+			}
+		case <-timeout:
+			t.Fatalf("Timeout waiting for Get calls to return")
+		}
 	}
 
 	// A fetcher was created, check if it has been removed after cancel
@@ -448,7 +485,7 @@ func TestNetStoreGetCallsOffer(t *testing.T) {
 	defer cancel()
 
 	// We call get for a not available chunk, it will timeout because the chunk is not delivered
-	chunk, err := netStore.Get(ctx, chunk.Address())
+	_, err := netStore.Get(ctx, chunk.Address())
 
 	if err != context.DeadlineExceeded {
 		t.Fatalf("Expect error %v got %v", context.DeadlineExceeded, err)
@@ -542,16 +579,12 @@ func TestNetStoreFetchFuncCalledMultipleTimes(t *testing.T) {
 		t.Fatalf("Expected netStore to have one fetcher for the requested chunk")
 	}
 
-	// Call wait three times parallelly
+	// Call wait three times in parallel
-	wg := sync.WaitGroup{}
+	count := 3
-	for i := 0; i < 3; i++ {
+	errC := make(chan error)
-		wg.Add(1)
+	for i := 0; i < count; i++ {
 		go func() {
-			err := wait(ctx)
+			errC <- wait(ctx)
-			if err != nil {
-				t.Fatalf("Expected no err got %v", err)
-			}
-			wg.Done()
 		}()
 	}
 
@@ -570,7 +603,12 @@ func TestNetStoreFetchFuncCalledMultipleTimes(t *testing.T) {
 	}
 
 	// wait until all wait calls return (because the chunk is delivered)
-	wg.Wait()
+	for i := 0; i < count; i++ {
+		err := <-errC
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
 
 	// There should be no more fetchers for the delivered chunk
 	if netStore.fetchers.Len() != 0 {
@@ -606,23 +644,29 @@ func TestNetStoreFetcherLifeCycleWithTimeout(t *testing.T) {
 		t.Fatalf("Expected netStore to have one fetcher for the requested chunk")
 	}
 
-	// Call wait three times parallelly
+	// Call wait three times in parallel
-	wg := sync.WaitGroup{}
+	count := 3
-	for i := 0; i < 3; i++ {
+	errC := make(chan error)
-		wg.Add(1)
+	for i := 0; i < count; i++ {
 		go func() {
-			defer wg.Done()
 			rctx, rcancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
 			defer rcancel()
 			err := wait(rctx)
 			if err != context.DeadlineExceeded {
-				t.Fatalf("Expected err %v got %v", context.DeadlineExceeded, err)
+				errC <- fmt.Errorf("Expected err %v got %v", context.DeadlineExceeded, err)
+				return
 			}
+			errC <- nil
 		}()
 	}
 
 	// wait until all wait calls timeout
-	wg.Wait()
+	for i := 0; i < count; i++ {
+		err := <-errC
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
 
 	// There should be no more fetchers after timeout
 	if netStore.fetchers.Len() != 0 {