44 lines
867 B
Go
44 lines
867 B
Go
package metrics
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import (
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"context"
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"errors"
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)
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var ErrImplemented = errors.New("there is implemenation already injected")
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var ctorImpl InternalNew = nil
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// name is dot spearated path
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// must be uniqe, use system naming, and unit postfix, examples:
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// ipfs.blockstore.bloomcache.bloom.miss.total
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// ipfs.routing.dht.notresuingstream.total
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//
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// both arguemnts are obligatory
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func New(name, helptext string) Creator {
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if ctorImpl == nil {
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return &noop{}
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} else {
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return ctorImpl(name, helptext)
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}
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}
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func NewCtx(ctx context.Context, name, helptext string) Creator {
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return New(CtxGetScope(ctx)+"."+name, helptext)
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}
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type InternalNew func(string, string) Creator
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func InjectImpl(newimpl InternalNew) error {
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if ctorImpl != nil {
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return ErrImplemented
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} else {
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ctorImpl = newimpl
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return nil
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}
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}
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func Active() bool {
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return ctorImpl != nil
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}
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