Soam Vasani
a6cd6e99fe
Poolmgr now watches the controller's list of environments and eagerly creates a generic pool for each environment, if one doesn't already exist.
115 lines
3.0 KiB
Go
115 lines
3.0 KiB
Go
/*
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Copyright 2016 The Fission Authors.
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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 poolmgr
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import (
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"log"
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"time"
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"k8s.io/client-go/1.4/kubernetes"
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"github.com/platform9/fission"
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"github.com/platform9/fission/controller/client"
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)
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type (
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GenericPoolManager struct {
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pools map[fission.Environment]*GenericPool
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kubernetesClient *kubernetes.Clientset
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namespace string
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controllerUrl string
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controllerClient *client.Client
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requestChannel chan *request
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}
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request struct {
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env *fission.Environment
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responseChannel chan *response
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}
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response struct {
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error
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pool *GenericPool
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}
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)
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func MakeGenericPoolManager(controllerUrl string, kubernetesClient *kubernetes.Clientset, namespace string) *GenericPoolManager {
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gpm := &GenericPoolManager{
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pools: make(map[fission.Environment]*GenericPool),
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kubernetesClient: kubernetesClient,
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namespace: namespace,
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controllerUrl: controllerUrl,
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controllerClient: client.MakeClient(controllerUrl),
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requestChannel: make(chan *request),
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}
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go gpm.service()
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go gpm.eagerPoolCreator()
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return gpm
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}
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func (gpm *GenericPoolManager) service() {
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for {
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select {
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case req := <-gpm.requestChannel:
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var err error
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pool, ok := gpm.pools[*req.env]
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if !ok {
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pool, err = MakeGenericPool(gpm.controllerUrl, gpm.kubernetesClient, req.env, 3, gpm.namespace)
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if err != nil {
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req.responseChannel <- &response{error: err}
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continue
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}
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gpm.pools[*req.env] = pool
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}
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req.responseChannel <- &response{pool: pool}
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}
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}
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}
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func (gpm *GenericPoolManager) GetPool(env *fission.Environment) (*GenericPool, error) {
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c := make(chan *response)
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gpm.requestChannel <- &request{env: env, responseChannel: c}
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resp := <-c
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return resp.pool, resp.error
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}
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func (gpm *GenericPoolManager) eagerPoolCreator() {
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failureCount := 0
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maxFailures := 5
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pollSleep := time.Duration(2 * time.Second)
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for {
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time.Sleep(pollSleep)
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// get list of envs from controller
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envs, err := gpm.controllerClient.EnvironmentList()
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if err != nil {
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failureCount++
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if failureCount >= maxFailures {
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log.Fatalf("Failed to connect to controller %v times: %v", maxFailures, err)
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}
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}
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// Create pools for all envs. TODO: we should make this a bit less eager, only
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// creating pools for envs that are actually used by functions. Also we might want
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// to keep these eagerly created pools smaller than the ones created when there are
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// actual function calls.
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for _, env := range envs {
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gpm.GetPool(&env)
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}
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}
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}
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