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Cache loaded JSON-LD contexts #3738

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Cache loaded JSON-LD contexts #3738

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27 changes: 25 additions & 2 deletions jsonld/ldutils.go
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@ import (
"github.com/piprate/json-gold/ld"
"io/fs"
"net/url"
"sync"
)

// ContextsConfig contains config for json-ld document loader
Expand Down Expand Up @@ -177,6 +178,26 @@ func DefaultContextConfig() ContextsConfig {
}
}

var _ ld.DocumentLoader = &cachingContextLoader{}

type cachingContextLoader struct {
entries sync.Map
underlying ld.DocumentLoader
}

func (c *cachingContextLoader) LoadDocument(u string) (*ld.RemoteDocument, error) {
entry, ok := c.entries.Load(u)
if ok {
return entry.(*ld.RemoteDocument), nil
}
doc, err := c.underlying.LoadDocument(u)
if err != nil {
return nil, err
}
c.entries.Store(u, doc)
return doc, nil
}

// DefaultAllowList returns the default allow list for external contexts
func DefaultAllowList() []string {
return []string{SchemaOrgContext, W3cVcContext, Jws2020Context, W3cStatusList2021Context}
Expand Down Expand Up @@ -208,15 +229,17 @@ func NewContextLoader(allowUnlistedExternalCalls bool, contexts ContextsConfig)
loader = NewFilteredLoader(allowed, loader)
}

cachingLoader := &cachingContextLoader{underlying: loader}

for contextURL, localFile := range contexts.LocalFileMapping {
// preload mapped files:
if _, err := loader.LoadDocument(contextURL); err != nil {
if _, err := cachingLoader.LoadDocument(contextURL); err != nil {
return nil, fmt.Errorf("preloading context %s failed: %w", contextURL, err)
}
log.Logger().Debugf("Loaded context from local file (context=%s, file=%s)", contextURL, localFile)
}

return loader, nil
return cachingLoader, nil
}

// LDUtil package a set of often used JSON-LD operations for re-usability.
Expand Down
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