add basic client; enable node level routing

Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>

cmd/hctl/peers.go

@@ -0,0 +1,63 @@
+/*
+	Copyright 2019 Stellar Project
+
+	Permission is hereby granted, free of charge, to any person obtaining a copy of
+	this software and associated documentation files (the "Software"), to deal in the
+	Software without restriction, including without limitation the rights to use, copy,
+	modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+	and to permit persons to whom the Software is furnished to do so, subject to the
+	following conditions:
+
+	The above copyright notice and this permission notice shall be included in all copies
+	or substantial portions of the Software.
+
+	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+	INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+	PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+	FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+	TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+	USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"text/tabwriter"
+
+	"github.com/urfave/cli"
+)
+
+var peersCommand = cli.Command{
+	Name:  "peers",
+	Usage: "peer management",
+	Subcommands: []cli.Command{
+		listPeersCommand,
+	},
+}
+var listPeersCommand = cli.Command{
+	Name:  "list",
+	Usage: "list peers",
+	Action: func(cx *cli.Context) error {
+		c, err := getClient(cx)
+		if err != nil {
+			return err
+		}
+		defer c.Close()
+
+		peers, err := c.Peers()
+		if err != nil {
+			return err
+		}
+
+		w := tabwriter.NewWriter(os.Stdout, 20, 1, 3, ' ', 0)
+		fmt.Fprintf(w, "ID\tPUBLIC KEY\tENDPOINT\tALLOWED\n")
+		for _, p := range peers {
+			fmt.Fprintf(w, "%s\t%s\t%s\t%s\n", p.ID, p.KeyPair.PublicKey, p.Endpoint, p.AllowedIPs)
+		}
+		w.Flush()
+
+		return nil
+	},
+}