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authorPéter Szilágyi <peterke@gmail.com>2015-11-06 05:57:57 +0800
committerPéter Szilágyi <peterke@gmail.com>2015-11-27 17:06:12 +0800
commit9e1d9bff3b18cfa09ba96cd027fa653daae10816 (patch)
tree95d74007caa613ba0c6a62962efcda2e96b273af /node/config.go
parent168d0e9e45939b7282204f3f52fe86fc8110cfc7 (diff)
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node: customizable protocol and service stacks
Diffstat (limited to 'node/config.go')
-rw-r--r--node/config.go171
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+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package node
+
+import (
+ "crypto/ecdsa"
+ "encoding/json"
+ "io/ioutil"
+ "net"
+ "os"
+ "path/filepath"
+
+ "github.com/ethereum/go-ethereum/crypto"
+ "github.com/ethereum/go-ethereum/logger"
+ "github.com/ethereum/go-ethereum/logger/glog"
+ "github.com/ethereum/go-ethereum/p2p/discover"
+ "github.com/ethereum/go-ethereum/p2p/nat"
+)
+
+var (
+ datadirPrivateKey = "nodekey" // Path within the datadir to the node's private key
+ datadirStaticNodes = "static-nodes.json" // Path within the datadir to the static node list
+ datadirTrustedNodes = "trusted-nodes.json" // Path within the datadir to the trusted node list
+ datadirNodeDatabase = "nodes" // Path within the datadir to store the node infos
+)
+
+// Config represents a small collection of configuration values to fine tune the
+// P2P network layer of a protocol stack. These values can be further extended by
+// all registered services.
+type Config struct {
+ // DataDir is the file system folder the node should use for any data storage
+ // requirements. The configured data directory will not be directly shared with
+ // registered services, instead those can use utility methods to create/access
+ // databases or flat files. This enables ephemeral nodes which can fully reside
+ // in memory.
+ DataDir string
+
+ // This field should be a valid secp256k1 private key that will be used for both
+ // remote peer identification as well as network traffic encryption. If no key
+ // is configured, the preset one is loaded from the data dir, generating it if
+ // needed.
+ PrivateKey *ecdsa.PrivateKey
+
+ // Name sets the node name of this server. Use common.MakeName to create a name
+ // that follows existing conventions.
+ Name string
+
+ // NoDiscovery specifies whether the peer discovery mechanism should be started
+ // or not. Disabling is usually useful for protocol debugging (manual topology).
+ NoDiscovery bool
+
+ // Bootstrap nodes used to establish connectivity with the rest of the network.
+ BootstrapNodes []*discover.Node
+
+ // Network interface address on which the node should listen for inbound peers.
+ ListenAddr string
+
+ // If set to a non-nil value, the given NAT port mapper is used to make the
+ // listening port available to the Internet.
+ NAT nat.Interface
+
+ // If Dialer is set to a non-nil value, the given Dialer is used to dial outbound
+ // peer connections.
+ Dialer *net.Dialer
+
+ // If NoDial is true, the node will not dial any peers.
+ NoDial bool
+
+ // MaxPeers is the maximum number of peers that can be connected. If this is
+ // set to zero, then only the configured static and trusted peers can connect.
+ MaxPeers int
+
+ // MaxPendingPeers is the maximum number of peers that can be pending in the
+ // handshake phase, counted separately for inbound and outbound connections.
+ // Zero defaults to preset values.
+ MaxPendingPeers int
+}
+
+// NodeKey retrieves the currently configured private key of the node, checking
+// first any manually set key, falling back to the one found in the configured
+// data folder. If no key can be found, a new one is generated.
+func (c *Config) NodeKey() *ecdsa.PrivateKey {
+ // Use any specifically configured key
+ if c.PrivateKey != nil {
+ return c.PrivateKey
+ }
+ // Generate ephemeral key if no datadir is being used
+ if c.DataDir == "" {
+ key, err := crypto.GenerateKey()
+ if err != nil {
+ glog.Fatalf("Failed to generate ephemeral node key: %v", err)
+ }
+ return key
+ }
+ // Fall back to persistent key from the data directory
+ keyfile := filepath.Join(c.DataDir, datadirPrivateKey)
+ if key, err := crypto.LoadECDSA(keyfile); err == nil {
+ return key
+ }
+ // No persistent key found, generate and store a new one
+ key, err := crypto.GenerateKey()
+ if err != nil {
+ glog.Fatalf("Failed to generate node key: %v", err)
+ }
+ if err := crypto.SaveECDSA(keyfile, key); err != nil {
+ glog.V(logger.Error).Infof("Failed to persist node key: %v", err)
+ }
+ return key
+}
+
+// StaticNodes returns a list of node enode URLs configured as static nodes.
+func (c *Config) StaticNodes() []*discover.Node {
+ return c.parsePersistentNodes(datadirStaticNodes)
+}
+
+// TrusterNodes returns a list of node enode URLs configured as trusted nodes.
+func (c *Config) TrusterNodes() []*discover.Node {
+ return c.parsePersistentNodes(datadirTrustedNodes)
+}
+
+// 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
+}