/
config.go
70 lines (63 loc) · 2.44 KB
/
config.go
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// Copyright (c) 2019 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 pendingheap
import (
"fmt"
"go.uber.org/yarpc/api/peer"
"go.uber.org/yarpc/yarpcconfig"
"go.uber.org/yarpc/yarpcerrors"
)
// Configuration descripes how to build a fewest pending heap peer list.
type Configuration struct {
Capacity *int `config:"capacity"`
}
// Spec returns a configuration specification for the pending heap peer list
// implementation, making it possible to select the least recently chosen peer
// with transports that use outbound peer list configuration (like HTTP).
//
// cfg := yarpcconfig.New()
// cfg.MustRegisterPeerList(pendingheap.Spec())
//
// This enables the pending heap peer list:
//
// outbounds:
// otherservice:
// unary:
// http:
// url: https://host:port/rpc
// fewest-pending-requests:
// peers:
// - 127.0.0.1:8080
// - 127.0.0.1:8081
func Spec() yarpcconfig.PeerListSpec {
return yarpcconfig.PeerListSpec{
Name: "fewest-pending-requests",
BuildPeerList: func(cfg Configuration, t peer.Transport, k *yarpcconfig.Kit) (peer.ChooserList, error) {
if cfg.Capacity == nil {
return New(t), nil
}
if *cfg.Capacity <= 0 {
return nil, yarpcerrors.Newf(yarpcerrors.CodeInvalidArgument,
fmt.Sprintf("Capacity must be greater than 0. Got: %d.", *cfg.Capacity))
}
return New(t, Capacity(*cfg.Capacity)), nil
},
}
}