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add memcached for did cache to relay
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package plc | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "github.com/bradfitz/gomemcache/memcache" | ||
| "go.opentelemetry.io/otel/attribute" | ||
| "time" | ||
|
|
||
| "github.com/bluesky-social/indigo/did" | ||
| "go.opentelemetry.io/otel" | ||
| ) | ||
|
|
||
| type MemcachedDidResolver struct { | ||
| mcd *memcache.Client | ||
| res did.Resolver | ||
| maxAge int32 | ||
| } | ||
|
|
||
| func NewMemcachedDidResolver(res did.Resolver, maxAge time.Duration, servers []string) *MemcachedDidResolver { | ||
| expiry := int32(0) | ||
| if maxAge.Seconds() > (30 * 24 * 60 * 60) { | ||
| // clamp expiry at 30 days minus a minute for memcached | ||
| expiry = (30 * 24 * 60 * 60) - 60 | ||
| } else { | ||
| expiry = int32(maxAge.Seconds()) | ||
| } | ||
| client := memcache.New(servers...) | ||
| return &MemcachedDidResolver{ | ||
| mcd: client, | ||
| res: res, | ||
| maxAge: expiry, | ||
| } | ||
| } | ||
|
|
||
| func (r *MemcachedDidResolver) FlushCacheFor(didstr string) { | ||
| r.mcd.Delete(didstr) | ||
| r.res.FlushCacheFor(didstr) | ||
| } | ||
|
|
||
| func (r *MemcachedDidResolver) tryCache(didstr string) (*did.Document, bool) { | ||
| ob, err := r.mcd.Get(didstr) | ||
| if (ob == nil) || (err != nil) { | ||
| return nil, false | ||
| } | ||
| var doc did.Document | ||
| err = json.Unmarshal(ob.Value, &doc) | ||
| if err != nil { | ||
| // TODO: log error? | ||
| return nil, false | ||
| } | ||
|
|
||
| return &doc, true | ||
| } | ||
|
|
||
| func (r *MemcachedDidResolver) putCache(did string, doc *did.Document) { | ||
| blob, err := json.Marshal(doc) | ||
| if err != nil { | ||
| // TODO: log error | ||
| return | ||
| } | ||
| item := memcache.Item{ | ||
| Key: did, | ||
| Value: blob, | ||
| Expiration: int32(r.maxAge), | ||
| } | ||
| r.mcd.Set(&item) | ||
| } | ||
|
|
||
| func (r *MemcachedDidResolver) GetDocument(ctx context.Context, didstr string) (*did.Document, error) { | ||
| ctx, span := otel.Tracer("cacheResolver").Start(ctx, "getDocument") | ||
| defer span.End() | ||
|
|
||
| doc, ok := r.tryCache(didstr) | ||
| if ok { | ||
| span.SetAttributes(attribute.Bool("cache", true)) | ||
| cacheHitsTotal.Inc() | ||
| return doc, nil | ||
| } | ||
| cacheMissesTotal.Inc() | ||
| span.SetAttributes(attribute.Bool("cache", false)) | ||
|
|
||
| doc, err := r.res.GetDocument(ctx, didstr) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| r.putCache(didstr, doc) | ||
| return doc, nil | ||
| } |