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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,58 @@ | ||
package blockssync | ||
|
||
import ( | ||
"context" | ||
|
||
"go.uber.org/zap" | ||
"golang.org/x/sync/errgroup" | ||
|
||
"github.com/spacemeshos/go-spacemesh/common/types" | ||
) | ||
|
||
//go:generate mockgen -package=blockssync -destination=./mocks.go -source=./blocks.go | ||
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type blockFetcher interface { | ||
GetBlocks(context.Context, []types.BlockID) error | ||
} | ||
|
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// Sync requests last specified blocks in background. | ||
func Sync(ctx context.Context, logger *zap.Logger, requests <-chan []types.BlockID, fetcher blockFetcher) error { | ||
var ( | ||
eg errgroup.Group | ||
lastch = make(chan map[types.BlockID]struct{}) | ||
) | ||
eg.Go(func() error { | ||
var ( | ||
send chan map[types.BlockID]struct{} | ||
last map[types.BlockID]struct{} | ||
) | ||
for { | ||
select { | ||
case <-ctx.Done(): | ||
close(lastch) | ||
return ctx.Err() | ||
case req := <-requests: | ||
if last == nil { | ||
last = map[types.BlockID]struct{}{} | ||
send = lastch | ||
} | ||
for _, id := range req { | ||
last[id] = struct{}{} | ||
} | ||
case send <- last: | ||
last = nil | ||
send = nil | ||
} | ||
} | ||
}) | ||
for batch := range lastch { | ||
blocks := make([]types.BlockID, 0, len(batch)) | ||
for id := range batch { | ||
blocks = append(blocks, id) | ||
} | ||
if err := fetcher.GetBlocks(ctx, blocks); err != nil { | ||
logger.Warn("failed to fetch blocks", zap.Error(err)) | ||
} | ||
} | ||
return eg.Wait() | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,84 @@ | ||
package blockssync | ||
|
||
import ( | ||
"context" | ||
"errors" | ||
"testing" | ||
"time" | ||
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"github.com/golang/mock/gomock" | ||
"github.com/stretchr/testify/require" | ||
"golang.org/x/sync/errgroup" | ||
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"github.com/spacemeshos/go-spacemesh/common/types" | ||
"github.com/spacemeshos/go-spacemesh/log/logtest" | ||
) | ||
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func TestCanBeAggregated(t *testing.T) { | ||
var ( | ||
ctrl = gomock.NewController(t) | ||
fetch = NewMockblockFetcher(ctrl) | ||
req = make(chan []types.BlockID, 10) | ||
out = make(chan []types.BlockID, 10) | ||
ctx, cancel = context.WithCancel(context.Background()) | ||
eg errgroup.Group | ||
) | ||
t.Cleanup(func() { | ||
cancel() | ||
eg.Wait() | ||
}) | ||
eg.Go(func() error { | ||
return Sync(ctx, logtest.New(t).Zap(), req, fetch) | ||
}) | ||
fetch.EXPECT().GetBlocks(gomock.Any(), gomock.Any()).DoAndReturn(func(ctx context.Context, blocks []types.BlockID) error { | ||
out <- blocks | ||
return nil | ||
}).AnyTimes() | ||
first := []types.BlockID{{1}, {2}, {3}} | ||
second := []types.BlockID{{2}, {3}, {4}} | ||
req <- first | ||
req <- second | ||
rst1 := timedRead(t, out) | ||
require.Subset(t, rst1, first) | ||
if len(rst1) == len(first) { | ||
require.Subset(t, timedRead(t, out), second) | ||
} | ||
} | ||
|
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func TestErrorDoesntExit(t *testing.T) { | ||
var ( | ||
ctrl = gomock.NewController(t) | ||
fetch = NewMockblockFetcher(ctrl) | ||
req = make(chan []types.BlockID, 10) | ||
out = make(chan []types.BlockID, 10) | ||
ctx, cancel = context.WithCancel(context.Background()) | ||
eg errgroup.Group | ||
) | ||
t.Cleanup(func() { | ||
cancel() | ||
eg.Wait() | ||
}) | ||
eg.Go(func() error { | ||
return Sync(ctx, logtest.New(t).Zap(), req, fetch) | ||
}) | ||
fetch.EXPECT().GetBlocks(gomock.Any(), gomock.Any()).DoAndReturn(func(ctx context.Context, blocks []types.BlockID) error { | ||
out <- blocks | ||
return errors.New("test") | ||
}).AnyTimes() | ||
first := []types.BlockID{{1}, {2}, {3}} | ||
req <- first | ||
require.Subset(t, timedRead(t, out), first) | ||
req <- first | ||
require.Subset(t, timedRead(t, out), first) | ||
} | ||
|
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func timedRead(tb testing.TB, blocks chan []types.BlockID) []types.BlockID { | ||
delay := time.Second | ||
select { | ||
case v := <-blocks: | ||
return v | ||
case <-time.After(delay): | ||
require.FailNow(tb, "timed out after", delay) | ||
} | ||
return nil | ||
} |
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