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context.go
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context.go
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// Copyright (c) 2015 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 (
"time"
"golang.org/x/net/context"
)
const defaultTimeout = time.Second
type contextKey int
const (
contextKeyTChannel contextKey = iota
contextKeyHeaders
)
type tchannelCtxParams struct {
tracingDisabled bool
hideListeningOnOutbound bool
call IncomingCall
options *CallOptions
retryOptions *RetryOptions
connectTimeout time.Duration
connectBaseContext context.Context
}
// IncomingCall exposes properties for incoming calls through the context.
type IncomingCall interface {
// CallerName returns the caller name from the CallerName transport header.
CallerName() string
// ShardKey returns the shard key from the ShardKey transport header.
ShardKey() string
// RoutingKey returns the routing key (referring to a traffic group) from
// RoutingKey transport header.
RoutingKey() string
// RoutingDelegate returns the routing delegate from RoutingDelegate
// transport header.
RoutingDelegate() string
// LocalPeer returns the local peer information.
LocalPeer() LocalPeerInfo
// RemotePeer returns the caller's peer information.
// If the caller is an ephemeral peer, then the HostPort cannot be used to make new
// connections to the caller.
RemotePeer() PeerInfo
// CallOptions returns the call options set for the incoming call. It can be
// useful for forwarding requests.
CallOptions() *CallOptions
}
func getTChannelParams(ctx context.Context) *tchannelCtxParams {
if params, ok := ctx.Value(contextKeyTChannel).(*tchannelCtxParams); ok {
return params
}
return nil
}
// NewContext returns a new root context used to make TChannel requests.
func NewContext(timeout time.Duration) (context.Context, context.CancelFunc) {
return NewContextBuilder(timeout).Build()
}
// WrapContextForTest returns a copy of the given Context that is associated with the call.
// This should be used in units test only.
// NOTE: This method is deprecated. Callers should use NewContextBuilder().SetIncomingCallForTest.
func WrapContextForTest(ctx context.Context, call IncomingCall) context.Context {
getTChannelParams(ctx).call = call
return ctx
}
// newIncomingContext creates a new context for an incoming call with the given span.
func newIncomingContext(ctx context.Context, call IncomingCall, timeout time.Duration) (context.Context, context.CancelFunc) {
return NewContextBuilder(timeout).
SetParentContext(ctx).
setIncomingCall(call).
Build()
}
// CurrentCall returns the current incoming call, or nil if this is not an incoming call context.
func CurrentCall(ctx context.Context) IncomingCall {
if params := getTChannelParams(ctx); params != nil {
return params.call
}
return nil
}
func currentCallOptions(ctx context.Context) *CallOptions {
if params := getTChannelParams(ctx); params != nil {
return params.options
}
return nil
}
func isTracingDisabled(ctx context.Context) bool {
if params := getTChannelParams(ctx); params != nil {
return params.tracingDisabled
}
return false
}