From e8d73d83ef393bd4702ed69d65003c39370ed267 Mon Sep 17 00:00:00 2001
From: David Hill <dhill@mindcry.org>
Date: Tue, 8 Oct 2013 21:18:49 -0400
Subject: [PATCH] Add btcctl; currently a barebones utility to send commands to
 btcd.

---
 util/btcctl/btcctl.go | 147 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 util/btcctl/btcctl.go

diff --git a/util/btcctl/btcctl.go b/util/btcctl/btcctl.go
new file mode 100644
index 00000000..71348743
--- /dev/null
+++ b/util/btcctl/btcctl.go
@@ -0,0 +1,147 @@
+package main
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"github.com/conformal/btcjson"
+	"github.com/davecgh/go-spew/spew"
+	"strconv"
+)
+
+const (
+	User     = "rpcuser"
+	Password = "rpcpass"
+	Server   = "127.0.0.1:8332"
+)
+
+var (
+	ErrNoData = errors.New("No data returned.")
+)
+
+func main() {
+	flag.Parse()
+
+	args := flag.Args()
+	if len(args) < 1 {
+		usage()
+		return
+	}
+
+	switch args[0] {
+	default:
+		usage()
+	case "getblock":
+		if len(args) != 2 {
+			usage()
+			break
+		}
+		msg, err := btcjson.CreateMessage("getblock", args[1])
+		if err != nil {
+			fmt.Printf("CreateMessage: %v\n", err)
+			break
+		}
+		reply, err := send(msg)
+		if err != nil {
+			fmt.Printf("RpcCommand: %v\n", err)
+			break
+		}
+		spew.Dump(reply.(btcjson.BlockResult))
+	case "getblockcount":
+		msg, err := btcjson.CreateMessage("getblockcount")
+		if err != nil {
+			fmt.Printf("CreateMessage: %v\n", err)
+			break
+		}
+		reply, err := send(msg)
+		if err != nil {
+			fmt.Printf("RpcCommand: %v\n", err)
+			break
+		}
+		fmt.Printf("%d\n", int(reply.(float64)))
+	case "getblockhash":
+		if len(args) != 2 {
+			usage()
+			break
+		}
+		idx, err := strconv.Atoi(args[1])
+		if err != nil {
+			fmt.Printf("Atoi: %v\n", err)
+			break
+		}
+		msg, err := btcjson.CreateMessage("getblockhash", idx)
+		if err != nil {
+			fmt.Printf("CreateMessage: %v\n", err)
+			break
+		}
+		reply, err := send(msg)
+		if err != nil {
+			fmt.Printf("RpcCommand: %v\n", err)
+			break
+		}
+		fmt.Printf("%v\n", reply)
+	case "getgenerate":
+		msg, err := btcjson.CreateMessage("getgenerate")
+		if err != nil {
+			fmt.Printf("CreateMessage: %v\n", err)
+			break
+		}
+		reply, err := send(msg)
+		if err != nil {
+			fmt.Printf("RpcCommand: %v\n", err)
+			break
+		}
+		fmt.Printf("%v\n", reply.(bool))
+	case "getrawtransaction":
+		if len(args) != 2 {
+			usage()
+			break
+		}
+		msg, err := btcjson.CreateMessage("getrawtransaction", args[1], 1)
+		if err != nil {
+			fmt.Printf("CreateMessage: %v\n", err)
+			break
+		}
+		reply, err := send(msg)
+		if err != nil {
+			fmt.Printf("RpcCommand: %v\n", err)
+			break
+		}
+		spew.Dump(reply)
+	case "stop":
+		msg, err := btcjson.CreateMessage("stop")
+		if err != nil {
+			fmt.Printf("CreateMessage: %v\n", err)
+			break
+		}
+		reply, err := send(msg)
+		if err != nil {
+			fmt.Printf("RpcCommand: %v\n", err)
+			break
+		}
+		fmt.Printf("%s\n", reply.(string))
+	}
+}
+
+func send(msg []byte) (interface{}, error) {
+	reply, err := btcjson.RpcCommand(User, Password, Server, msg)
+	if err != nil {
+		return 0, err
+	}
+	if reply.Result == nil {
+		err := ErrNoData
+		return 0, err
+	}
+	return reply.Result, nil
+}
+
+func usage() {
+	fmt.Printf(
+		"usage:\n" +
+			"\tgetblock <blockhash>\n" +
+			"\tgetblockcount\n" +
+			"\tgetblockhash <blocknumber>\n" +
+			"\tgetgenerate\n" +
+			"\tgetrawtransaction <txhash>\n" +
+			"\tstop\n")
+}