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inbound.go
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inbound.go
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// Copyright (c) 2016 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"
"time"
"go.uber.org/yarpc/internal/errors"
"go.uber.org/yarpc/internal/request"
"go.uber.org/yarpc/serialize"
"go.uber.org/yarpc/transport"
"go.uber.org/yarpc/transport/internal"
"github.com/opentracing/opentracing-go"
)
// Inbound is a redis inbound that reads from the given queueKey. This will
// wait for an item in the queue or until the timout is reached before trying
// to read again.
type Inbound struct {
registry transport.Registry
tracer opentracing.Tracer
client Client
timeout time.Duration
queueKey string
processingKey string
stop chan struct{}
}
// NewInbound creates a redis transport.Inbound
func NewInbound(client Client, queueKey, processingKey string, timeout time.Duration) *Inbound {
return &Inbound{
tracer: opentracing.GlobalTracer(),
client: client,
timeout: timeout,
stop: make(chan struct{}),
}
}
// WithTracer configures a tracer on this inbound.
func (i *Inbound) WithTracer(tracer opentracing.Tracer) *Inbound {
i.tracer = tracer
return i
}
// WithRegistry configures a registry to handle incoming requests,
// as a chained method for convenience.
func (i *Inbound) WithRegistry(registry transport.Registry) *Inbound {
i.registry = registry
return i
}
// SetRegistry configures a registry to handle incoming requests.
// This satisfies the transport.Inbound interface, and would be called
// by a dispatcher when it starts.
func (i *Inbound) SetRegistry(registry transport.Registry) {
i.registry = registry
}
// Start starts the inbound, reading from the queueKey
func (i *Inbound) Start() error {
if i.registry == nil {
return errors.NoRegistryError{}
}
err := i.client.Start()
if err != nil {
return err
}
go i.start()
return nil
}
func (i *Inbound) start() {
for {
select {
case <-i.stop:
return
default:
i.handle()
}
}
}
// Stop ends the connection to redis
func (i *Inbound) Stop() error {
close(i.stop)
return i.client.Stop()
}
func (i *Inbound) handle() error {
// TODO: logging
item, err := i.client.BRPopLPush(i.queueKey, i.processingKey, i.timeout)
if err != nil {
return err
}
defer i.client.LRem(i.queueKey, item)
start := time.Now()
spanContext, req, err := serialize.FromBytes(i.tracer, item)
if err != nil {
return err
}
ctx, span := transport.ExtractOpenTracingSpan(context.Background(), spanContext, req, i.tracer, "redis", start)
defer span.Finish()
v := request.Validator{Request: req}
req, err = v.Validate(ctx)
if err != nil {
return transport.UpdateSpanWithErr(span, err)
}
spec, err := i.registry.Choose(ctx, req)
if err != nil {
return transport.UpdateSpanWithErr(span, err)
}
if spec.Type() != transport.Oneway {
err = errors.UnsupportedTypeError{Transport: "redis", Type: string(spec.Type())}
return transport.UpdateSpanWithErr(span, err)
}
req, err = v.ValidateOneway(ctx)
if err != nil {
return transport.UpdateSpanWithErr(span, err)
}
return internal.SafelyCallOnewayHandler(ctx, spec.Oneway(), req)
}