[contracts] Use command line parameters for ContractInteractions

dagger/contracts/interactions.nim

@@ -29,7 +29,16 @@ proc new*(_: type ContractInteractions,
     proving: Proving.new(proofs)
   )
 
-proc new*(_: type ContractInteractions): ContractInteractions =
-  let provider = JsonRpcProvider.new("ws://localhost:8545")
-  let signer = provider.getSigner()
+proc new*(_: type ContractInteractions,
+          providerUrl: string,
+          account = Address.default): ContractInteractions =
+  let provider = JsonRpcProvider.new(providerUrl)
+  var signer: Signer
+  if account == Address.default:
+    signer = provider.getSigner()
+  else:
+    signer = provider.getSigner(account)
   ContractInteractions.new(signer, deployment())
+
+proc new*(_: type ContractInteractions): ContractInteractions =
+  ContractInteractions.new("ws://localhost:8545")

dagger/dagger.nim

@@ -122,7 +122,7 @@ proc new*(T: type DaggerServer, config: DaggerConf): T =
     engine = BlockExcEngine.new(localStore, wallet, network, discovery)
     store = NetworkStore.new(engine, localStore)
     erasure = Erasure.new(store, leoEncoderProvider, leoDecoderProvider)
-    contracts = ContractInteractions.new()
+    contracts = ContractInteractions.new(config.ethProvider, config.ethAccount)
     daggerNode = DaggerNodeRef.new(switch, store, engine, erasure, discovery, contracts)
     restServer = RestServerRef.new(
       daggerNode.initRestApi(),

tests/contracts/testInteractions.nim

@@ -1,5 +1,6 @@
 import ./ethertest
 import dagger/contracts
+import ./examples
 
 ethersuite "Storage Contract Interactions":
 
@@ -13,6 +14,12 @@ ethersuite "Storage Contract Interactions":
     let deployment = deployment()
     check ContractInteractions.new(signer, deployment) != nil
 
+  test "can be instantiated with a provider url and account":
+    let url = "http://localhost:8545"
+    let account = Address.example
+    check ContractInteractions.new(url) != nil
+    check ContractInteractions.new(url, account) != nil
+
   test "provides purchasing":
     check contracts.purchasing != nil