/
outbound.go
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/
outbound.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package redis
import (
"context"
"fmt"
"time"
"go.uber.org/yarpc/api/transport"
"go.uber.org/yarpc/internal/introspection"
"go.uber.org/yarpc/internal/sync"
"go.uber.org/yarpc/serialize"
"github.com/opentracing/opentracing-go"
)
var (
_ transport.OnewayOutbound = (*Outbound)(nil)
_ introspection.IntrospectableOutbound = (*Outbound)(nil)
)
// Outbound is a redis OnewayOutbound that puts an RPC into the given queue key
type Outbound struct {
client Client
tracer opentracing.Tracer
queueKey string
once sync.LifecycleOnce
}
// NewOnewayOutbound creates a redis Outbound that satisfies transport.OnewayOutbound
// queueKey - key for the queue in redis
func NewOnewayOutbound(client Client, queueKey string) *Outbound {
return &Outbound{
once: sync.Once(),
client: client,
tracer: opentracing.GlobalTracer(),
queueKey: queueKey,
}
}
// Transports returns nil for now
func (o *Outbound) Transports() []transport.Transport {
// TODO
return nil
}
// WithTracer configures a tracer for the outbound
func (o *Outbound) WithTracer(tracer opentracing.Tracer) *Outbound {
o.tracer = tracer
return o
}
// Start creates connection to the redis instance
func (o *Outbound) Start() error {
return o.once.Start(o.client.Start)
}
// Stop stops the redis connection
func (o *Outbound) Stop() error {
return o.once.Stop(o.client.Stop)
}
// IsRunning returns whether the Outbound is running.
func (o *Outbound) IsRunning() bool {
return o.once.IsRunning()
}
// CallOneway makes a oneway request using redis
func (o *Outbound) CallOneway(ctx context.Context, req *transport.Request) (transport.Ack, error) {
if err := o.once.WhenRunning(ctx); err != nil {
return nil, err
}
createOpenTracingSpan := transport.CreateOpenTracingSpan{
Tracer: o.tracer,
TransportName: transportName,
StartTime: time.Now(),
}
_, span := createOpenTracingSpan.Do(ctx, req)
defer span.Finish()
marshalledRPC, err := serialize.ToBytes(o.tracer, span.Context(), req)
if err != nil {
return nil, transport.UpdateSpanWithErr(span, err)
}
err = o.client.LPush(o.queueKey, marshalledRPC)
ack := time.Now()
if err != nil {
return nil, transport.UpdateSpanWithErr(span, err)
}
return ack, nil
}
// Introspect returns basic status about this outbound.
func (o *Outbound) Introspect() introspection.OutboundStatus {
return introspection.OutboundStatus{
Transport: transportName,
Endpoint: o.client.Endpoint(),
State: fmt.Sprintf("%s (queue: %s)", o.client.ConnectionState(),
o.queueKey),
}
}