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9413123c0f
* config: generate cookie secret if not set in all-in-one mode * fix tests * config: add warning about cookie_secret * breakup lines
27 lines
489 B
Go
27 lines
489 B
Go
// Package syncutil contains methods for working with sync code.
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package syncutil
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import (
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"sync"
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)
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// A OnceMap is a collection sync.Onces accessible by a key. The zero value is usable.
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type OnceMap[T comparable] struct {
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mu sync.Mutex
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m map[T]*sync.Once
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}
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// Do runs f once.
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func (o *OnceMap[T]) Do(key T, f func()) {
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o.mu.Lock()
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if o.m == nil {
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o.m = make(map[T]*sync.Once)
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}
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oo, ok := o.m[key]
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if !ok {
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oo = new(sync.Once)
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o.m[key] = oo
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}
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o.mu.Unlock()
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oo.Do(f)
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}
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