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hostinfo.go
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hostinfo.go
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// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
//
// Copyright (c) 2020 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 ringpop provides a service-based membership monitor
package ringpop
import (
"fmt"
"math/bits"
"github.com/dgryski/go-farm"
rpmembership "github.com/temporalio/ringpop-go/membership"
"go.temporal.io/server/common/membership"
)
// hostInfo represents a host in a ring.
type hostInfo struct {
addr string // ip:port
labels map[string]string // this map is shared with ringpop
labelsChecksum uint64 // cache this for quick comparison
}
var _ rpmembership.Member = (*hostInfo)(nil)
var _ membership.HostInfo = (*hostInfo)(nil)
// newHostInfo creates a new *hostInfo instance
func newHostInfo(addr string, labels map[string]string) *hostInfo {
return &hostInfo{
addr: addr,
labels: labels,
labelsChecksum: checksumLabels(labels),
}
}
// GetAddress returns the ip:port address
func (hi *hostInfo) GetAddress() string {
return hi.addr
}
// Identity implements ringpop's Membership interface
func (hi *hostInfo) Identity() string {
// For now, we just use the address as the identity.
return hi.addr
}
// Label implements ringpop's Membership interface
func (hi *hostInfo) Label(key string) (string, bool) {
value, ok := hi.labels[key]
return value, ok
}
// summary returns a shorthand summary string suitable for logging.
func (hi *hostInfo) summary() string {
s := hi.GetAddress()
for k, v := range hi.labels {
switch k {
case roleKey, portKey:
// skip these, they can be determined from context
default:
s += fmt.Sprintf("[%s=%s]", k, v)
}
}
return s
}
// checksumLabels returns a checksum of a labels map
func checksumLabels(labels map[string]string) uint64 {
var c uint64
for k, v := range labels {
kfp := farm.Fingerprint64([]byte(k))
vfp := farm.Fingerprint64([]byte(v))
// use xor to combine different labels so that it comes out the same with any iteration
// order, without needing to sort.
c ^= kfp + bits.RotateLeft64(vfp, 3)
}
return c
}