forked from stern/stern
/
main.go
88 lines (75 loc) · 2.24 KB
/
main.go
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// Copyright 2016 Wercker Holding BV
//
// 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 stern
import (
"context"
"github.com/pkg/errors"
"github.com/wercker/stern/kubernetes"
)
// Run starts the main run loop
func Run(ctx context.Context, config *Config) error {
clientConfig := kubernetes.NewClientConfig(config.KubeConfig, config.ContextName)
clientset, err := kubernetes.NewClientSet(clientConfig)
if err != nil {
return err
}
var namespace string
// A specific namespace is ignored if all-namespaces is provided
if config.AllNamespaces {
namespace = ""
} else {
namespace = config.Namespace
if namespace == "" {
namespace, _, err = clientConfig.Namespace()
if err != nil {
return errors.Wrap(err, "unable to get default namespace")
}
}
}
added, removed, err := Watch(ctx, clientset.Core().Pods(namespace), config.PodQuery, config.ContainerQuery, config.ExcludeContainerQuery, config.ContainerState, config.LabelSelector)
if err != nil {
return errors.Wrap(err, "failed to set up watch")
}
tails := make(map[string]*Tail)
go func() {
for p := range added {
id := p.GetID()
if tails[id] != nil {
continue
}
tail := NewTail(p.Namespace, p.Pod, p.Container, config.Template, &TailOptions{
Timestamps: config.Timestamps,
SinceSeconds: int64(config.Since.Seconds()),
Exclude: config.Exclude,
Include: config.Include,
Namespace: config.AllNamespaces,
TailLines: config.TailLines,
})
tails[id] = tail
tail.Start(ctx, clientset.Core().Pods(p.Namespace))
}
}()
go func() {
for p := range removed {
id := p.GetID()
if tails[id] == nil {
continue
}
tails[id].Close()
delete(tails, id)
}
}()
<-ctx.Done()
return nil
}