openArray

datastore/sql/sqliteutils.nim

@@ -3,6 +3,8 @@ import pkg/questionable/results
 import pkg/sqlite3_abi
 import pkg/upraises
 
+import ../backend
+
 export sqlite3_abi
 
 # Adapted from:
@@ -61,7 +63,14 @@ proc bindParam(
     sqlite3_bind_int64(s, n.cint, val.int64)
   elif val is float32 | float64:
     sqlite3_bind_double(s, n.cint, val.float64)
-  elif val is string|openArray[char]:
+  elif val is string:
+    # `-1` implies string length is num bytes up to first null-terminator;
+    # `SQLITE_TRANSIENT` "indicate[s] that the object is to be copied prior
+    # to the return from sqlite3_bind_*(). The object and pointer to it must
+    # remain valid until then. SQLite will then manage the lifetime of its
+    # private copy."
+    sqlite3_bind_text(s, n.cint, val.cstring, -1.cint, SQLITE_TRANSIENT)
+  elif val is DbKey:
     # `-1` implies string length is num bytes up to first null-terminator;
     # `SQLITE_TRANSIENT` "indicate[s] that the object is to be copied prior
     # to the return from sqlite3_bind_*(). The object and pointer to it must

datastore/threads/databuffer.nim

@@ -51,10 +51,15 @@ proc new*[T: byte | char](tp: type DataBuffer, data: openArray[T]): DataBuffer =
   ##
   result = DataBuffer.new(data.len)
   if data.len() > 0:
-    # TODO: we might want to copy data, otherwise the GC might
-    # release it on stack-unwind
     copyMem(result[].buf, baseAddr data, data.len)
 
+proc setData*[T: byte | char](db: DataBuffer, data: openArray[T]) =
+  ## allocate new buffer and copies indata from openArray
+  ##
+  if data.len() > db.len():
+    raise newException(IndexDefect, "data too large for buffer")
+  copyMem(db[].buf, baseAddr data, data.len)
+
 converter toSeq*(self: DataBuffer): seq[byte] =
   ## convert buffer to a seq type using copy and either a byte or char
   ##

datastore/threads/threadresult.nim

@@ -22,23 +22,30 @@ type
   ThreadQueryRes* = (DataBuffer, DataBuffer)
   ThreadResult*[T: ThreadTypes] = Result[T, ThreadResErr]
 
-  DbKey* = tuple[data: DataBuffer]
+  DbKey* = object
-  DbValue* = tuple[data: DataBuffer]
+    data: DataBuffer
+  DbVal* = object
+    data: DataBuffer
 
 proc toDb*(key: Key): DbKey {.inline, raises: [].} =
-  (data: DataBuffer.new(key.id()))
+  let id: string = key.id()
+  let db = DataBuffer.new(id.len()+1) # include room for null for cstring compat
+  db.setData(id)
+  DbKey(data: db)
 
 proc toKey*(key: DbKey): Key {.inline, raises: [].} =
   Key.init(key.data).expect("expected valid key here for but got `" & $key.data & "`")
 
-proc toDb*(value: sink seq[byte]): DbValue {.inline, raises: [].} =
+proc toDb*(value: sink seq[byte]): DbVal {.inline, raises: [].} =
-  (data: DataBuffer.new(value))
+  DbVal(data: DataBuffer.new(value))
 
-proc toValue*(value: DbValue): seq[byte] {.inline, raises: [].} =
+proc toValue*(value: DbVal): seq[byte] {.inline, raises: [].} =
   value.data.toSeq()
 
 template toOpenArray*(x: DbKey): openArray[char] =
-  x.data[].buf.toOpenArray(0, x[].size-1)
+  x.data.toOpenArray(char)
+template toOpenArray*(x: DbVal): openArray[byte] =
+  x.data.toOpenArray(byte)
 
 converter toThreadErr*(e: ref CatchableError): ThreadResErr {.inline, raises: [].} =
   if e of DatastoreKeyNotFound: (ErrorEnum.DatastoreKeyNotFoundErr, DataBuffer.new(e.msg))