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inbound.go
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inbound.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 tchannel
import (
"go.uber.org/yarpc/api/transport"
"go.uber.org/yarpc/internal/introspection"
"go.uber.org/yarpc/pkg/lifecycle"
"go.uber.org/zap"
)
// Inbound receives YARPC requests over TChannel. It may be constructed using
// the NewInbound method on a tchannel.Transport.
type Inbound struct {
once *lifecycle.Once
transport *Transport
}
// NewInbound returns a new TChannel inbound backed by a shared TChannel
// transport.
// There should only be one inbound for TChannel since all outbounds send the
// listening port over non-ephemeral connections so a service can deduplicate
// locally- and remotely-initiated persistent connections.
func (t *Transport) NewInbound() *Inbound {
return &Inbound{
once: lifecycle.NewOnce(),
transport: t,
}
}
// SetRouter configures a router to handle incoming requests.
// This satisfies the transport.Inbound interface, and would be called
// by a dispatcher when it starts.
func (i *Inbound) SetRouter(router transport.Router) {
i.transport.router = router
}
// Transports returns a slice containing the Inbound's underlying
// Transport.
func (i *Inbound) Transports() []transport.Transport {
return []transport.Transport{i.transport}
}
// Start starts this Inbound. Note that this does not start listening for
// connections; that occurs when you start the underlying ChannelTransport is
// started.
func (i *Inbound) Start() error {
return i.once.Start(func() error {
i.transport.logger.Info("started TChannel inbound", zap.String("address", i.transport.addr))
if i.transport.router == nil || len(i.transport.router.Procedures()) == 0 {
i.transport.logger.Warn("no procedures specified for tchannel inbound")
}
return nil
})
}
// Stop stops the TChannel outbound. This currently does nothing.
func (i *Inbound) Stop() error {
return i.once.Stop(nil)
}
// IsRunning returns whether the Inbound is running.
func (i *Inbound) IsRunning() bool {
return i.once.IsRunning()
}
// Introspect returns the state of the inbound for introspection purposes.
func (i *Inbound) Introspect() introspection.InboundStatus {
stateString := ""
if i.transport.ch != nil {
stateString = i.transport.ch.State().String()
}
return introspection.InboundStatus{
Transport: "tchannel",
Endpoint: i.transport.addr,
State: stateString,
}
}