54 lines
1.9 KiB
Nim
54 lines
1.9 KiB
Nim
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import stew/results
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type
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ADbTResult*[T] = Result[T, string]
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AbstractDbTransaction* = ref object
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obj: RootRef
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commitProc: AbstractDbTransactionCommitProc
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rollbackProc: AbstractDbTransactionRollbackProc
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putProc: AbstractDbTransactionPutProc
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delProc: AbstractDbTransactionDelProc
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AbstractDbTransactionCommitProc = proc (t: RootRef): ADbTResult[void] {.nimcall, gcsafe, raises: [Defect].}
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AbstractDbTransactionRollbackProc = proc (t: RootRef): ADbTResult[void] {.nimcall, gcsafe, raises: [Defect].}
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AbstractDbTransactionPutProc = proc (db: RootRef, key, val: openArray[byte]): ADbTResult[void] {.nimcall, gcsafe, raises: [Defect].}
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AbstractDbTransactionDelProc = proc (db: RootRef, key: openArray[byte]): ADbTResult[void] {.nimcall, gcsafe, raises: [Defect].}
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proc abstractTransactionCommitImpl[T](x: RootRef): ADbTResult[void] =
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mixin commit
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commit(T(x))
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proc abstractTransactionRollbackImpl[T](x: RootRef): ADbTResult[void] =
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mixin rollback
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rollback(T(x))
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proc abstractTransactionPutImpl[T](x: RootRef, key, val: openArray[byte]): ADbTResult[void] =
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mixin put
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put(T(x), key, val)
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proc abstractTransactionDelImpl[T](x: RootRef, key: openArray[byte]): ADbTResult[void] =
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mixin del
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del(T(x), key)
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proc init*[T: RootRef](_:type AbstractDbTransaction, x: T): AbstractDbTransaction =
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mixin commit, rollback, put, del
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new result
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result.obj = x
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result.commitProc = abstractTransactionCommitImpl[T]
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result.rollbackProc = abstractTransactionRollbackImpl[T]
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result.putProc = abstractTransactionPutImpl[T]
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result.delProc = abstractTransactionDelImpl[T]
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proc commit*(t: AbstractDbTransaction): ADbTResult[void] =
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t.commitProc(t.obj)
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proc rollback*(t: AbstractDbTransaction): ADbTResult[void] =
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t.rollbackProc(t.obj)
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proc put*(t: AbstractDbTransaction, key, val: openArray[byte]): ADbTResult[void] =
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t.putProc(t.obj, key, val)
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proc del*(t: AbstractDbTransaction, key: openArray[byte]): ADbTResult[void] =
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t.delProc(t.obj, key)
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