mirror of https://github.com/k3s-io/k3s
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package scheduler
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import (
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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// TODO: move everything from pkg/scheduler into this package. Remove references from registry.
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"github.com/GoogleCloudPlatform/kubernetes/pkg/scheduler"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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)
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// Binder knows how to write a binding.
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type Binder interface {
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Bind(binding *api.Binding) error
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}
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// Scheduler watches for new unscheduled pods. It attempts to find
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// minions that they fit on and writes bindings back to the api server.
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type Scheduler struct {
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config *Config
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}
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type Config struct {
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MinionLister scheduler.MinionLister
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Algorithm scheduler.Scheduler
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Binder Binder
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// NextPod should be a function that blocks until the next pod
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// is available. We don't use a channel for this, because scheduling
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// a pod may take some amount of time and we don't want pods to get
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// stale while they sit in a channel.
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NextPod func() *api.Pod
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// Error is called if there is an error. It is passed the pod in
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// question, and the error
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Error func(*api.Pod, error)
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}
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// New returns a new scheduler.
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func New(c *Config) *Scheduler {
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s := &Scheduler{
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config: c,
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}
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return s
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}
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// Run begins watching and scheduling. It starts a goroutine and returns immediately.
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func (s *Scheduler) Run() {
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go util.Forever(s.scheduleOne, 0)
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}
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func (s *Scheduler) scheduleOne() {
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pod := s.config.NextPod()
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dest, err := s.config.Algorithm.Schedule(*pod, s.config.MinionLister)
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if err != nil {
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s.config.Error(pod, err)
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return
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}
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b := &api.Binding{
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PodID: pod.ID,
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Host: dest,
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}
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if err := s.config.Binder.Bind(b); err != nil {
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s.config.Error(pod, err)
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}
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}
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