118b0c9408
This fixes a data race on the listener(s) that get started in the metrics plugins. It also restore pkg/uniq to its former glory and removes and state being carried in there; this means for metrics that registry.go was to replicate that behavior *with* locking (as pkg/uniq doesn't do, or need that). Also renamed uniqAddr to just u, to make it slightly shorter. Signed-off-by: Miek Gieben <miek@miek.nl>
46 lines
962 B
Go
46 lines
962 B
Go
// Package uniq keeps track of "thing" that are either "todo" or "done". Multiple
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// identical events will only be processed once.
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package uniq
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// U keeps track of item to be done.
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type U struct {
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u map[string]item
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}
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type item struct {
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state int // either todo or done
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f func() error // function to be executed.
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}
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// New returns a new initialized U.
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func New() U { return U{u: make(map[string]item)} }
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// Set sets function f in U under key. If the key already exists it is not overwritten.
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func (u U) Set(key string, f func() error) {
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if _, ok := u.u[key]; ok {
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return
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}
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u.u[key] = item{todo, f}
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}
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// Unset removes the key.
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func (u U) Unset(key string) {
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delete(u.u, key)
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}
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// ForEach iterates for u executes f for each element that is 'todo' and sets it to 'done'.
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func (u U) ForEach() error {
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for k, v := range u.u {
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if v.state == todo {
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v.f()
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}
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v.state = done
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u.u[k] = v
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}
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return nil
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}
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const (
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todo = 1
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done = 2
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)
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