forked from fission/fission
/
gpm.go
170 lines (149 loc) · 4.21 KB
/
gpm.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
/*
Copyright 2016 The Fission Authors.
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 poolmgr
import (
"log"
"time"
"k8s.io/client-go/1.5/kubernetes"
"github.com/fission/fission"
"github.com/fission/fission/controller/client"
)
type requestType int
const (
GET_POOL requestType = iota
CLEANUP_POOLS
)
type (
GenericPoolManager struct {
pools map[fission.Environment]*GenericPool
kubernetesClient *kubernetes.Clientset
namespace string
controllerUrl string
controllerClient *client.Client
fsCache *functionServiceCache
instanceId string
requestChannel chan *request
}
request struct {
requestType
env *fission.Environment
envList []fission.Environment
responseChannel chan *response
}
response struct {
error
pool *GenericPool
}
)
func MakeGenericPoolManager(
controllerUrl string,
kubernetesClient *kubernetes.Clientset,
namespace string,
fsCache *functionServiceCache,
instanceId string) *GenericPoolManager {
gpm := &GenericPoolManager{
pools: make(map[fission.Environment]*GenericPool),
kubernetesClient: kubernetesClient,
namespace: namespace,
controllerUrl: controllerUrl,
controllerClient: client.MakeClient(controllerUrl),
fsCache: fsCache,
instanceId: instanceId,
requestChannel: make(chan *request),
}
go gpm.service()
go gpm.eagerPoolCreator()
return gpm
}
func (gpm *GenericPoolManager) service() {
for {
req := <-gpm.requestChannel
switch req.requestType {
case GET_POOL:
var err error
pool, ok := gpm.pools[*req.env]
if !ok {
pool, err = MakeGenericPool(
gpm.controllerUrl, gpm.kubernetesClient, req.env,
3, // TODO configurable/autoscalable
gpm.namespace, gpm.fsCache, gpm.instanceId)
if err != nil {
req.responseChannel <- &response{error: err}
continue
}
gpm.pools[*req.env] = pool
}
req.responseChannel <- &response{pool: pool}
case CLEANUP_POOLS:
uids := make(map[string]bool)
for _, env := range req.envList {
uids[env.Metadata.Uid] = true
}
for env, pool := range gpm.pools {
_, ok := uids[env.Metadata.Uid]
if !ok {
// Env no longer exists -- remove our cache
log.Printf("Destroying generic pool for environment [%v]", env)
delete(gpm.pools, env)
// and delete the pool asynchronously.
go pool.destroy()
}
}
// no response, caller doesn't wait
}
}
}
func (gpm *GenericPoolManager) GetPool(env *fission.Environment) (*GenericPool, error) {
c := make(chan *response)
gpm.requestChannel <- &request{
requestType: GET_POOL,
env: env,
responseChannel: c,
}
resp := <-c
return resp.pool, resp.error
}
func (gpm *GenericPoolManager) CleanupPools(envs []fission.Environment) {
gpm.requestChannel <- &request{
requestType: CLEANUP_POOLS,
envList: envs,
}
}
func (gpm *GenericPoolManager) eagerPoolCreator() {
failureCount := 0
maxFailures := 5
pollSleep := time.Duration(2 * time.Second)
for {
time.Sleep(pollSleep)
// get list of envs from controller
envs, err := gpm.controllerClient.EnvironmentList()
if err != nil {
failureCount++
if failureCount >= maxFailures {
log.Fatalf("Failed to connect to controller %v times: %v", maxFailures, err)
}
}
// Create pools for all envs. TODO: we should make this a bit less eager, only
// creating pools for envs that are actually used by functions. Also we might want
// to keep these eagerly created pools smaller than the ones created when there are
// actual function calls.
for _, env := range envs {
_, err := gpm.GetPool(&env)
if err != nil {
log.Printf("eager-create pool failed: %v", err)
}
}
// Clean up pools whose env was deleted
gpm.CleanupPools(envs)
}
}