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runner.go
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runner.go
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// Copyright 2021 xgfone
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package task
import (
"context"
"net"
"strings"
)
// Runner is a task runner.
type Runner interface {
AddTask(Task)
DelTask(Task)
Stop()
}
type taskCtxType uint8
const taskCtx taskCtxType = 0
// GetTaskFromCtx returns the task from the context.
func GetTaskFromCtx(ctx context.Context) Task {
if v := ctx.Value(taskCtx); v != nil {
return v.(Task)
}
return nil
}
func setTaskToCtx(ctx context.Context, task Task) context.Context {
return context.WithValue(ctx, taskCtx, task)
}
// CanRunVip returns a function to reports whether the task can be run
// based on vip.
//
// Return true if vip is empty.
func CanRunVip(vip string) func() bool {
ip := net.ParseIP(strings.TrimSpace(vip))
return func() bool {
if isZero(ip) {
return true
}
addrs, _ := net.InterfaceAddrs()
for _, addr := range addrs {
ipport := addr.String()
if index := strings.IndexByte(ipport, '/'); index > 0 {
ipport = ipport[:index]
}
if ip.Equal(net.ParseIP(ipport)) {
return true
}
}
return false
}
}
func isZero(ip net.IP) bool {
for _, b := range ip {
if b != 0 {
return false
}
}
return true
}