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Use sync package from unofficial Go library

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Uses the sync package from the unofficial Go library instead
of simpler solution.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alex@openfaas.com>
This commit is contained in:
Alex Ellis (OpenFaaS Ltd)
2022-06-23 10:53:20 +01:00
committed by Alex Ellis
parent 6ed0ab71fb
commit 01841f605c
10 changed files with 286 additions and 9 deletions
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8
gateway/scaling/function_query.go
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@ -6,13 +6,15 @@ package scaling
import (
"fmt"
"log"
"golang.org/x/sync/singleflight"
)
type CachedFunctionQuery struct {
cache FunctionCacher
serviceQuery ServiceQuery
emptyAnnotations map[string]string
singleFlight *SingleFlight
singleFlight *singleflight.Group
}
func NewCachedFunctionQuery(cache FunctionCacher, serviceQuery ServiceQuery) FunctionQuery {
@ -20,7 +22,7 @@ func NewCachedFunctionQuery(cache FunctionCacher, serviceQuery ServiceQuery) Fun
cache: cache,
serviceQuery: serviceQuery,
emptyAnnotations: map[string]string{},
singleFlight: NewSingleFlight(),
singleFlight: &singleflight.Group{},
}
}
@ -41,7 +43,7 @@ func (c *CachedFunctionQuery) Get(fn string, ns string) (ServiceQueryResponse, e
query, hit := c.cache.Get(fn, ns)
if !hit {
key := fmt.Sprintf("GetReplicas-%s.%s", fn, ns)
queryResponse, err := c.singleFlight.Do(key, func() (interface{}, error) {
queryResponse, err, _ := c.singleFlight.Do(key, func() (interface{}, error) {
log.Printf("Cache miss - run GetReplicas")
// If there is a cache miss, then fetch the value from the provider API
return c.serviceQuery.GetReplicas(fn, ns)