Add more concrete types.

Add concrete return type for getaddressesbyaccount and make some of
the other command type handeling more explicit in the code.

internal_test.go

@@ -37,6 +37,8 @@ var resulttests = []struct {
 	{"getblock", []byte(`{"error":null,"id":1,"result":[{"a":"b"}]}`), false, false},
 	{"getrawtransaction", []byte(`{"error":null,"id":1,"result":[{"a":"b"}]}`), false, false},
 	{"decoderawtransaction", []byte(`{"error":null,"id":1,"result":[{"a":"b"}]}`), false, false},
+	{"getaddressesbyaccount", []byte(`{"error":null,"id":1,"result":[{"a":"b"}]}`), false, false},
+	{"getaddressesbyaccount", []byte(`{"error":null,"id":1,"result":["test"]}`), false, true},
 }
 
 // TestReadResultCmd tests that readResultCmd can properly unmarshall the

jsonapi.go

@@ -665,6 +665,23 @@ func readResultCmd(cmd string, message []byte) (Reply, error) {
 			return result, err
 		}
 		result.Result = res
+	case "getaddressesbyaccount":
+		var res []string
+		err = json.Unmarshal(objmap["result"], &res)
+		if err != nil {
+			err = fmt.Errorf("Error unmarshalling json reply: %v", err)
+			return result, err
+		}
+		result.Result = res
+	// For commands that return a single item, we get it with the
+	// correct concrete type for free (but treat them seperately
+	// for clarity.
+	case "getblockcount":
+		err = json.Unmarshal(message, &result)
+		if err != nil {
+			err = fmt.Errorf("Error unmarshalling json reply: %v", err)
+			return result, err
+		}
 	// For anything else put it in an interface.  All the data is still
 	// there, just a little less convenient to deal with.
 	default:

test_coverage.txt

@@ -6,7 +6,7 @@ github.com/conformal/btcjson/jsonfxns.go MarshallAndSend 100.00% (7/7)
 github.com/conformal/btcjson/jsonfxns.go GetRaw		 100.00% (6/6)
 github.com/conformal/btcjson/jsonapi.go	 jsonWithArgs	 100.00% (5/5)
 github.com/conformal/btcjson/jsonapi.go	 IsValidIdType	 100.00% (3/3)
-github.com/conformal/btcjson/jsonapi.go	 readResultCmd	 90.00% (45/50)
+github.com/conformal/btcjson/jsonapi.go	 readResultCmd	 85.00% (51/60)
 github.com/conformal/btcjson/jsonapi.go	 RpcCommand	 66.67% (18/27)
-github.com/conformal/btcjson		 --------------- 96.74% (416/430)
+github.com/conformal/btcjson		 --------------- 95.91% (422/440)