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util.go
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util.go
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/*
* Copyright 2021 InfAI (CC SES)
*
* 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 docker
import (
"context"
"errors"
"github.com/testcontainers/testcontainers-go"
"github.com/testcontainers/testcontainers-go/wait"
"log"
"net"
"os"
"time"
)
func getFreePort() (int, error) {
addr, err := net.ResolveTCPAddr("tcp", "localhost:0")
if err != nil {
return 0, err
}
listener, err := net.ListenTCP("tcp", addr)
if err != nil {
return 0, err
}
defer listener.Close()
return listener.Addr().(*net.TCPAddr).Port, nil
}
func Dockerlog(ctx context.Context, container testcontainers.Container, name string) error {
container.FollowOutput(&LogWriter{logger: log.New(os.Stdout, "["+name+"] ", log.LstdFlags)})
err := container.StartLogProducer(ctx)
if err != nil {
return err
}
return nil
}
type LogWriter struct {
logger *log.Logger
}
func (this *LogWriter) Accept(l testcontainers.Log) {
this.Write(l.Content)
}
func (this *LogWriter) Write(p []byte) (n int, err error) {
this.logger.Print(string(p))
return len(p), nil
}
func waitretry(timeout time.Duration, f func(ctx context.Context, target wait.StrategyTarget) error) func(ctx context.Context, target wait.StrategyTarget) error {
return func(ctx context.Context, target wait.StrategyTarget) (err error) {
return retry(timeout, func() error {
return f(ctx, target)
})
}
}
func retry(timeout time.Duration, f func() error) (err error) {
err = errors.New("initial")
start := time.Now()
for i := int64(1); err != nil && time.Since(start) < timeout; i++ {
err = f()
if err != nil {
log.Println("ERROR: :", err)
wait := time.Duration(i) * time.Second
if time.Since(start)+wait < timeout {
log.Println("ERROR: retry after:", wait.String())
time.Sleep(wait)
} else {
time.Sleep(time.Since(start) + wait - timeout)
return f()
}
}
}
return err
}