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tpl/partials: Fix cache locking
To make sure a cached partial is ony executed exactly once. Performance same: ```bash name old time/op new time/op delta TemplateParamsKeysToLower-4 17.2µs ± 0% 16.5µs ± 0% ~ (p=1.000 n=1+1) Partial-4 18.6µs ± 0% 19.4µs ± 0% ~ (p=1.000 n=1+1) PartialCached-4 64.2ns ± 0% 63.7ns ± 0% ~ (p=1.000 n=1+1) name old alloc/op new alloc/op delta TemplateParamsKeysToLower-4 2.66kB ± 0% 2.66kB ± 0% ~ (all equal) Partial-4 1.31kB ± 0% 1.31kB ± 0% ~ (all equal) PartialCached-4 0.00B 0.00B ~ (all equal) name old allocs/op new allocs/op delta TemplateParamsKeysToLower-4 92.0 ± 0% 92.0 ± 0% ~ (all equal) Partial-4 41.0 ± 0% 41.0 ± 0% ~ (all equal) ```
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parent
7730d683e8
commit
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1 changed files with 15 additions and 12 deletions
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@ -110,27 +110,30 @@ func (ns *Namespace) IncludeCached(name string, context interface{}, variant ...
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return ns.getOrCreate(key, name, context)
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}
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func (ns *Namespace) getOrCreate(key, name string, context interface{}) (p interface{}, err error) {
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var ok bool
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func (ns *Namespace) getOrCreate(key, name string, context interface{}) (interface{}, error) {
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ns.cachedPartials.RLock()
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p, ok = ns.cachedPartials.p[key]
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p, ok := ns.cachedPartials.p[key]
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ns.cachedPartials.RUnlock()
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if ok {
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return
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return p, nil
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}
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ns.cachedPartials.Lock()
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if p, ok = ns.cachedPartials.p[key]; !ok {
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ns.cachedPartials.Unlock()
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p, err = ns.Include(name, context)
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ns.cachedPartials.Lock()
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ns.cachedPartials.p[key] = p
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defer ns.cachedPartials.Unlock()
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// Double-check.
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if p, ok = ns.cachedPartials.p[key]; ok {
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return p, nil
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}
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ns.cachedPartials.Unlock()
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return
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p, err := ns.Include(name, context)
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if err != nil {
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return nil, err
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}
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ns.cachedPartials.p[key] = p
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return p, nil
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}
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