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