feat(config) add GCR config section

repo/config/config.go

@@ -24,6 +24,7 @@ type Config struct {
 	Bootstrap []string  // local nodes's bootstrap peer addresses
 	Tour      Tour      // local node's tour position
 	Gateway   Gateway   // local node's gateway server options
+	GCR       GCR       // local node's routing servers (if GCR enabled)
 	Log       Log
 }
 

repo/config/gcr_servers.go

+package config
+
+import "github.com/jbenet/go-ipfs/util/ipfsaddr"
+
+// TODO replace with final servers before merge
+
+type GCR struct {
+	Servers []string
+}
+
+var DefaultGCRServers = []string{
+	"/ip4/104.236.70.34/tcp/4001/QmaWJw5mcWkCThPtC7hVq28e3WbwLHnWF8HbMNJrRDybE4",
+	"/ip4/128.199.72.111/tcp/4001/Qmd2cSiZUt7vhiuTmqBB7XWbkuFR8KMLiEuQssjyNXyaZT",
+}
+
+func initGCR() (*GCR, error) {
+	// TODO perform validation
+	return &GCR{
+		Servers: DefaultGCRServers,
+	}, nil
+}
+
+func (gcr *GCR) ServerIPFSAddrs() ([]ipfsaddr.IPFSAddr, error) {
+	var addrs []ipfsaddr.IPFSAddr
+	for _, server := range gcr.Servers {
+		addr, err := ipfsaddr.ParseString(server)
+		if err != nil {
+			return nil, err
+		}
+		addrs = append(addrs, addr)
+	}
+	return addrs, nil
+}

repo/config/init.go

@@ -26,6 +26,11 @@ func Init(out io.Writer, nBitsForKeypair int) (*Config, error) {
 		return nil, err
 	}
 
+	gcr, err := initGCR()
+	if err != nil {
+		return nil, err
+	}
+
 	conf := &Config{
 
 		// setup the node's default addresses.
@@ -40,6 +45,7 @@ func Init(out io.Writer, nBitsForKeypair int) (*Config, error) {
 		},
 
 		Bootstrap: BootstrapPeerStrings(bootstrapPeers),
+		GCR:       *gcr,
 		Datastore: *ds,
 		Identity:  identity,
 		Log: Log{