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feat: add assertion compiler (kyverno#503)
Signed-off-by: Charles-Edouard Brétéché <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| package matching | ||
|
|
||
| import ( | ||
| "sync" | ||
|
|
||
| "github.com/cespare/xxhash" | ||
| "github.com/elastic/go-freelru" | ||
| "github.com/kyverno/kyverno-json/pkg/core/assertion" | ||
| "github.com/kyverno/kyverno-json/pkg/core/templating" | ||
| ) | ||
|
|
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| type Compiler struct { | ||
| templating.Compiler | ||
| *freelru.SyncedLRU[string, func() (assertion.Assertion, error)] | ||
| } | ||
|
|
||
| func hashStringXXHASH(s string) uint32 { | ||
| sum := xxhash.Sum64String(s) | ||
| return uint32(sum) //nolint:gosec | ||
| } | ||
|
|
||
| func NewCompiler(compiler templating.Compiler, cacheSize uint32) Compiler { | ||
| out := Compiler{ | ||
| Compiler: compiler, | ||
| } | ||
| if cache, err := freelru.NewSynced[string, func() (assertion.Assertion, error)](cacheSize, hashStringXXHASH); err == nil { | ||
| out.SyncedLRU = cache | ||
| } | ||
| return out | ||
| } | ||
|
|
||
| func (c Compiler) CompileAssertion(hash string, value any) (assertion.Assertion, error) { | ||
| if c.SyncedLRU == nil { | ||
| return assertion.Parse(value, c.Compiler) | ||
| } | ||
| entry, _ := c.SyncedLRU.Get(hash) | ||
| if entry == nil { | ||
| entry = sync.OnceValues(func() (assertion.Assertion, error) { | ||
| return assertion.Parse(value, c.Compiler) | ||
| }) | ||
| c.SyncedLRU.Add(hash, entry) | ||
| } | ||
| return entry() | ||
| } |
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