/
options.go
112 lines (101 loc) · 3.69 KB
/
options.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
// Mgmt
// Copyright (C) 2013-2024+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
// Additional permission under GNU GPL version 3 section 7
//
// If you modify this program, or any covered work, by linking or combining it
// with embedded mcl code and modules (and that the embedded mcl code and
// modules which link with this program, contain a copy of their source code in
// the authoritative form) containing parts covered by the terms of any other
// license, the licensors of this program grant you additional permission to
// convey the resulting work. Furthermore, the licensors of this program grant
// the original author, James Shubin, additional permission to update this
// additional permission if he deems it necessary to achieve the goals of this
// additional permission.
package scheduler
import (
"fmt"
)
// Option is a type that can be used to configure the scheduler.
type Option func(*schedulerOptions)
// schedulerOptions represents the different possible configurable options. Not
// all options necessarily work for each scheduler strategy algorithm.
type schedulerOptions struct {
debug bool
logf func(format string, v ...interface{})
strategy Strategy
maxCount int // TODO: should this be *int to know when it's set?
reuseLease bool
sessionTTL int // TODO: should this be *int to know when it's set?
hostsFilter []string
// TODO: add more options
}
// Debug specifies whether we should run in debug mode or not.
func Debug(debug bool) Option {
return func(so *schedulerOptions) {
so.debug = debug
}
}
// Logf passes a logger function that we can use if so desired.
func Logf(logf func(format string, v ...interface{})) Option {
return func(so *schedulerOptions) {
so.logf = logf
}
}
// StrategyKind sets the scheduler strategy used.
func StrategyKind(strategy string) Option {
return func(so *schedulerOptions) {
f, exists := registeredStrategies[strategy]
if !exists {
panic(fmt.Sprintf("scheduler: undefined strategy: %s", strategy))
}
so.strategy = f()
}
}
// MaxCount is the maximum number of hosts that should get simultaneously
// scheduled.
func MaxCount(maxCount int) Option {
return func(so *schedulerOptions) {
if maxCount > 0 {
so.maxCount = maxCount
}
}
}
// ReuseLease specifies whether we should try and re-use the lease between runs.
// Ordinarily it would get discarded with each new version (deploy) of the code.
func ReuseLease(reuseLease bool) Option {
return func(so *schedulerOptions) {
so.reuseLease = reuseLease
}
}
// SessionTTL is the amount of time to delay before expiring a key on abrupt
// host disconnect of if ReuseLease is true.
func SessionTTL(sessionTTL int) Option {
return func(so *schedulerOptions) {
if sessionTTL > 0 {
so.sessionTTL = sessionTTL
}
}
}
// HostsFilter specifies a manual list of hosts, to use as a subset of whatever
// was auto-discovered.
// XXX: think more about this idea...
func HostsFilter(hosts []string) Option {
return func(so *schedulerOptions) {
so.hostsFilter = hosts
}
}