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API Change: AtomicPut with previous = nil is create.

AtomicPut can now be used to Compare-and-Swap against the state
where the key doesn't yet exist.  E.g. a race where two clients
create the same key: one succeeds, the other fails.

Pass nil for the previous argument of AtomicPut for this
behavior.  Before, this would cause an error.

Implements this change for all three backends.
Spike Curtis 10 년 전
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a2d4e1c246
1개의 변경된 파일2개의 추가작업 그리고 1개의 파일을 삭제
  1. 2 1
      libnetwork/internal/kvstore/kvstore.go

+ 2 - 1
libnetwork/internal/kvstore/kvstore.go

@@ -77,7 +77,8 @@ type Store interface {
 	// DeleteTree deletes a range of keys under a given directory
 	DeleteTree(directory string) error
 
-	// Atomic operation on a single value
+	// Atomic CAS operation on a single value.
+	// Pass previous = nil to create a new key.
 	AtomicPut(key string, value []byte, previous *KVPair, options *WriteOptions) (bool, *KVPair, error)
 
 	// Atomic delete of a single value