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batched_ingress_client.go
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batched_ingress_client.go
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package routing
import (
"log"
"time"
batching "code.cloudfoundry.org/go-batching"
diodes "code.cloudfoundry.org/go-diodes"
"code.cloudfoundry.org/go-loggregator/rpc/loggregator_v2"
rpc "code.cloudfoundry.org/log-cache/pkg/rpc/logcache_v1"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
// BatchedIngressClient batches envelopes before sending it. Each invocation
// to Send is async.
type BatchedIngressClient struct {
c rpc.IngressClient
buffer *diodes.OneToOne
size int
interval time.Duration
log *log.Logger
}
// Metrics registers new Counter metrics.
type Metrics interface {
// NewCounter returns a func that can be used to increment a counter
// metric.
NewCounter(name string) func(delta uint64)
}
// NewBatchedIngressClient returns a new BatchedIngressClient.
func NewBatchedIngressClient(
size int,
interval time.Duration,
c rpc.IngressClient,
m Metrics,
log *log.Logger,
) *BatchedIngressClient {
dropped := m.NewCounter("Dropped")
b := &BatchedIngressClient{
c: c,
size: size,
interval: interval,
log: log,
buffer: diodes.NewOneToOne(10000, diodes.AlertFunc(func(missed int) {
log.Printf("Dropped %d envelopes", missed)
dropped(uint64(missed))
})),
}
go b.start()
return b
}
// Send batches envelopes before shipping them to the client.
func (b *BatchedIngressClient) Send(ctx context.Context, in *rpc.SendRequest, opts ...grpc.CallOption) (*rpc.SendResponse, error) {
for i := range in.GetEnvelopes().GetBatch() {
b.buffer.Set(diodes.GenericDataType(in.Envelopes.Batch[i]))
}
return &rpc.SendResponse{}, nil
}
func (b *BatchedIngressClient) start() {
batcher := batching.NewBatcher(b.size, b.interval, batching.WriterFunc(b.write))
for {
e, ok := b.buffer.TryNext()
if !ok {
batcher.Flush()
time.Sleep(50 * time.Millisecond)
continue
}
batcher.Write((*loggregator_v2.Envelope)(e))
}
}
func (b *BatchedIngressClient) write(batch []interface{}) {
var e []*loggregator_v2.Envelope
for _, i := range batch {
e = append(e, i.(*loggregator_v2.Envelope))
}
ctx, _ := context.WithTimeout(context.Background(), 3*time.Second)
_, err := b.c.Send(ctx, &rpc.SendRequest{
LocalOnly: true,
Envelopes: &loggregator_v2.EnvelopeBatch{Batch: e},
})
if err != nil {
b.log.Printf("failed to write envelope: %s", err)
}
}