Soam Vasani
7d1058d7be
GenericPool is a pool of generic containers for an environment. GenericPoolManager keeps track of all GenericPools, creating them on-demand. The pool manager API is simply a "lookup" for the service URL of a function. If one exists it is returned immediately; otherwise, a generic pool is created, and then a pod is specialized from that pool. poolmgr is designed to run from within the cluster, since it connects to pod IP addresses directly. This is a first cut with many pieces missing. TODO: * Use versioned kubernetes clients instead of the unversioned one * Unit tests for GenericPoolMgr; improve unit test for GenericPool; test for API. * Handle cases where a service exists but pod backing it has failed. * On start up, use existing deployments/pods/services if they exist; in other words don't orphan resources on restart. * Kill idle resources (services, pods, even generic pools) * Autoscale generic pool (for example, by watching num ready pods)
78 lines
2.0 KiB
Go
78 lines
2.0 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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"github.com/platform9/fission"
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clientUnversioned "k8s.io/kubernetes/pkg/client/unversioned"
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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 *clientUnversioned.Client
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namespace string
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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(client *clientUnversioned.Client, namespace string) *GenericPoolManager {
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gpm := &GenericPoolManager{
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pools: make(map[fission.Environment]*GenericPool),
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kubernetesClient: client,
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namespace: namespace,
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requestChannel: make(chan *request),
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}
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go gpm.service()
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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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pool, ok := gpm.pools[*req.env]
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if !ok {
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pool, err := MakeGenericPool(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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req.responseChannel <- &response{pool: 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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