-
Notifications
You must be signed in to change notification settings - Fork 0
/
job_mgr.go
174 lines (151 loc) · 3.72 KB
/
job_mgr.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
171
172
173
174
package master
import (
"context"
"encoding/json"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/mvcc/mvccpb"
"github.com/zhuanxuhit/crontab/internal/app/common"
"github.com/zhuanxuhit/crontab/internal/app/worker/conf"
"time"
)
// 任务管理器
type JobMgr struct {
client *clientv3.Client
kv clientv3.KV
lease clientv3.Lease
}
var (
// 单例
G_jobMgr *JobMgr
)
// 初始化管理器
func InitJobMgr() (err error) {
var (
config clientv3.Config
client *clientv3.Client
kv clientv3.KV
lease clientv3.Lease
)
// 初始化配置
config = clientv3.Config{
Endpoints: conf.Conf.EtcdEndpoints, // 集群地址
DialTimeout: time.Duration(conf.Conf.EtcdDialTimeout) * time.Millisecond, // 连接超时
}
// 建立连接
if client, err = clientv3.New(config); err != nil {
return
}
// 得到KV和Lease的API子集
kv = clientv3.NewKV(client)
lease = clientv3.NewLease(client)
// 赋值单例
G_jobMgr = &JobMgr{
client: client,
kv: kv,
lease: lease,
}
return
}
// 保存任务
func (jobMgr *JobMgr) SaveJob(job *common.Job) (oldJob *common.Job, err error) {
// 把任务保存到/cron/jobs/任务名 -> json
var (
jobKey string
jobValue []byte
putResp *clientv3.PutResponse
oldJobObj common.Job
)
// etcd的保存key
jobKey = common.JobSaveDir + job.Name
// 任务信息json
if jobValue, err = json.Marshal(job); err != nil {
return
}
// 保存到etcd
if putResp, err = jobMgr.kv.Put(context.TODO(), jobKey, string(jobValue), clientv3.WithPrevKV()); err != nil {
return
}
// 如果是更新, 那么返回旧值
if putResp.PrevKv != nil {
// 对旧值做一个反序列化
if err = json.Unmarshal(putResp.PrevKv.Value, &oldJobObj); err != nil {
err = nil
return
}
oldJob = &oldJobObj
}
return
}
// 删除任务
func (jobMgr *JobMgr) DeleteJob(name string) (oldJob *common.Job, err error) {
var (
jobKey string
delResp *clientv3.DeleteResponse
oldJobObj common.Job
)
// etcd中保存任务的key
jobKey = common.JobSaveDir + name
// 从etcd中删除它
if delResp, err = jobMgr.kv.Delete(context.TODO(), jobKey, clientv3.WithPrevKV()); err != nil {
return
}
// 返回被删除的任务信息
if len(delResp.PrevKvs) != 0 {
// 解析一下旧值, 返回它
if err =json.Unmarshal(delResp.PrevKvs[0].Value, &oldJobObj); err != nil {
err = nil
return
}
oldJob = &oldJobObj
}
return
}
// 列举任务
func (jobMgr *JobMgr) ListJobs() (jobList []*common.Job, err error) {
var (
dirKey string
getResp *clientv3.GetResponse
kvPair *mvccpb.KeyValue
job *common.Job
)
// 任务保存的目录
dirKey = common.JobSaveDir
// 获取目录下所有任务信息
if getResp, err = jobMgr.kv.Get(context.TODO(), dirKey, clientv3.WithPrefix()); err != nil {
return
}
// 初始化数组空间
jobList = make([]*common.Job, 0)
// 遍历所有任务, 进行反序列化
for _, kvPair = range getResp.Kvs {
job = &common.Job{}
if err =json.Unmarshal(kvPair.Value, job); err != nil {
err = nil
continue
}
jobList = append(jobList, job)
}
return
}
// 杀死任务
func (jobMgr *JobMgr) KillJob(name string) (err error) {
// 更新一下key=/cron/killer/任务名
var (
killerKey string
leaseGrantResp *clientv3.LeaseGrantResponse
leaseId clientv3.LeaseID
)
// 通知worker杀死对应任务
killerKey = common.JobKillerDir + name
// 让worker监听到一次put操作, 创建一个租约让其稍后自动过期即可
if leaseGrantResp, err = jobMgr.lease.Grant(context.TODO(), 1); err != nil {
return
}
// 租约ID
leaseId = leaseGrantResp.ID
// 设置killer标记
if _, err = jobMgr.kv.Put(context.TODO(), killerKey, "", clientv3.WithLease(leaseId)); err != nil {
return
}
return
}