// parsePersistentNodes parses a list of discovery node URLs loaded from a .json
// file from within the data directory.
func (c *Config) parsePersistentNodes(file string) []*discover.Node {
// Short circuit if no node config is present
if c.DataDir == "" {
return nil
}
path := filepath.Join(c.DataDir, file)
if _, err := os.Stat(path); err != nil {
return nil
}
// Load the nodes from the config file
blob, err := ioutil.ReadFile(path)
if err != nil {
glog.V(logger.Error).Infof("Failed to access nodes: %v", err)
return nil
}
nodelist := []string{}
if err := json.Unmarshal(blob, &nodelist); err != nil {
glog.V(logger.Error).Infof("Failed to load nodes: %v", err)
return nil
}
// Interpret the list as a discovery node array
var nodes []*discover.Node
for _, url := range nodelist {
if url == "" {
continue
}
node, err := discover.ParseNode(url)
if err != nil {
glog.V(logger.Error).Infof("Node URL %s: %v\n", url, err)
continue
}
nodes = append(nodes, node)
}
return nodes
}
// 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) AddPeer(url string) (bool, error) {
// Make sure the server is running, fail otherwise
server := api.node.Server()
if server == nil {
return false, ErrNodeStopped
}
// Try to add the url as a static peer and return
node, err := discover.ParseNode(url)
if err != nil {
return false, fmt.Errorf("invalid enode: %v", err)
}
server.AddPeer(node)
return true, nil
}
// MakeBootstrapNodes creates a list of bootstrap nodes from the command line
// flags, reverting to pre-configured ones if none have been specified.
func MakeBootstrapNodes(ctx *cli.Context) []*discover.Node {
// Return pre-configured nodes if none were manually requested
if !ctx.GlobalIsSet(BootnodesFlag.Name) {
if ctx.GlobalBool(TestNetFlag.Name) {
return TestNetBootNodes
}
return FrontierBootNodes
}
// Otherwise parse and use the CLI bootstrap nodes
bootnodes := []*discover.Node{}
for _, url := range strings.Split(ctx.GlobalString(BootnodesFlag.Name), ",") {
node, err := discover.ParseNode(url)
if err != nil {
glog.V(logger.Error).Infof("Bootstrap URL %s: %v\n", url, err)
continue
}
bootnodes = append(bootnodes, node)
}
return bootnodes
}