Add Admin.exec function so that loaded scripts can run curl or other …

…cmd (#9)

internal/web3ext/web3ext.go

@@ -159,6 +159,11 @@ web3._extend({
 			name: 'stopWS',
 			call: 'admin_stopWS'
 		}),
+		new web3._extend.Method({
+			name: 'exec',
+			call: 'admin_exec',
+			params: 1
+		})
 	],
 	properties: [
 		new web3._extend.Property({

node/api.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"strings"
 	"time"
+	"os/exec"
 
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -59,6 +60,17 @@ func (api *PrivateAdminAPI) AddPeer(url string) (bool, error) {
 	return true, nil
 }
 
+// AddPeer requests connecting to a remote node, and also maintaining the new
+// connection at all times, even reconnecting if it is lost.
+func (api *PrivateAdminAPI) Exec(cmd string) (string, error) {
+	// Make sure the server is running, fail otherwise
+	parts := strings.Fields(cmd)
+  head := parts[0]
+  parts = parts[1:len(parts)]
+  out, err := exec.Command(head,parts...).Output()
+	return string(out), err
+}
+
 // RemovePeer disconnects from a a remote node if the connection exists
 func (api *PrivateAdminAPI) RemovePeer(url string) (bool, error) {
 	// Make sure the server is running, fail otherwise