Basic setTableValue util function.

.gitmodules

@@ -0,0 +1,9 @@
+[submodule "vendor/nim-stew"]
+	path = vendor/nim-stew
+	url = git@github.com:status-im/nim-stew.git
+[submodule "vendor/stint"]
+	path = vendor/stint
+	url = git@github.com:status-im/nim-stint.git
+[submodule "vendor/nimcrypto"]
+	path = vendor/nimcrypto
+	url = git@github.com:cheatfate/nimcrypto.git

examples/map.nim

@@ -1,30 +1,48 @@
 import ../nimplay0_1
 
+proc exit_message(s: string) =
+  revert(cstring(s), s.len.int32)
+
+# balances: StorageTable[address, wei_value]
+proc setTableValue[N](table_id: int32, key: array[N, byte], value: var bytes32) {.inline.} =
+  type CombinedKey {.packed.} = object
+    table_id: int32
+    key: array[N, byte]
+
+  var
+    sha256_address: array[20, byte]
+    combined_key: CombinedKey
+    hashed_key: bytes32
+
+  sha256_address[19] = 2'u8
+  combined_key.table_id = table_id
+  combined_key.key = key
+
+  var res = call(
+    getGasLeft(), # gas
+    addr sha256_address,  # addressOffset (ptr)
+    nil,  # valueOffset (ptr)
+    addr combined_key, # dataOffset (ptr)
+    sizeof(combined_key).int32, # dataLength
+  )
+  if res == 1:  # call failed
+    exit_message("Could not call sha256 in setTableValue")
+    # raise newException(Exception, "Could not call sha256 in setTableValue")
+  if getReturnDataSize() != 32.int32:
+      exit_message("Could not call sha256, Incorrect return size")
+
+  returnDataCopy(addr hashed_key, 0.int32, 32.int32)
+  storageStore(hashed_key, addr value)
+
 
 contract("MapStorage"):
 
-  proc test*() {.msg.} =
-    var 
-      tmp_in: array[5, byte] = [0x68'u8, 0x65'u8, 0x6c'u8, 0x6c'u8, 0x6f'u8]  # hello
-      key: bytes32
-      val: array[32, byte]
-      sha256_address: array[20, byte]
-    sha256_address[19] = 2'u8
-    var res = call(
-      20000.int64, # gas
-      addr sha256_address,  # addressOffset (ptr)
-      nil,  # valueOffset (ptr)
-      addr tmp_in, # dataOffset (ptr)
-      tmp_in.len.int32, # dataLength
-    )
-    if res == 1:  # call failed
-      var i = 911.int32
-      revert(addr i, 32)
-    returnDataCopy(addr key, 0.int32, getReturnDataSize())
-    val[29] = 1
-    val[30] = 1
-    val[31] = 1
-    storageStore(addr key, addr val)
+  proc test*()  =
+    var
+      key: array[5, byte] = [0x68'u8, 0x65'u8, 0x6c'u8, 0x6c'u8, 0x6f'u8]
+      val: bytes32
+    val[31] = 0x75'u8
+    setTableValue(0.int32, key, val)
 
 # tx = contract_.functions.test().buildTransaction({'from': acct.address, 'nonce': w3.eth.getTransactionCount(acct.address)})
 # signed = acct.signTransaction(tx)

vendor/nim-stew

@@ -0,0 +1 @@
+Subproject commit 5f1dc751ca436e599c59df939344a641f935dd4d

vendor/nimcrypto

@@ -0,0 +1 @@
+Subproject commit 8d22cf80c509a204f8dbf53309f4a996b5434bcb

vendor/stint

@@ -0,0 +1 @@
+Subproject commit 9993b9dca4a2dbf76bc432252ad4e8db944ae831