gaspersic/go-ethereum
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

cmd, common, core, eth, node, rpc, tests, whisper, xeth: use protocol stacks

Browse Source
This commit is contained in:
Péter Szilágyi
2015-11-17 18:33:25 +02:00
parent 8a44451edf
commit 1e806c4c77
30 changed files with 1051 additions and 949 deletions
Download Patch File Download Diff File Expand all files Collapse all files

124
node/node.go
View File

@ -21,6 +21,7 @@ import (
"errors"
"os"
"path/filepath"
"reflect"
"sync"
"syscall"
@ -40,14 +41,17 @@ var (
// Node represents a P2P node into which arbitrary services might be registered.
type Node struct {
datadir string // Path to the currently used data directory
config *p2p.Server // Configuration of the underlying P2P networking layer
stack map[string]ServiceConstructor // Protocol stack registered into this node
emux *event.TypeMux // Event multiplexer used between the services of a stack
datadir string // Path to the currently used data directory
eventmux *event.TypeMux // Event multiplexer used between the services of a stack
running *p2p.Server // Currently running P2P networking layer
services map[string]Service // Currently running services
serverConfig *p2p.Server // Configuration of the underlying P2P networking layer
server *p2p.Server // Currently running P2P networking layer
serviceIndex map[string]ServiceConstructor // Set of services currently registered in the node
serviceOrder []string // Service construction order to handle dependencies
services map[string]Service // Currently running services
stop chan struct{} // Channel to wait for termination notifications
lock sync.RWMutex
}
@ -66,7 +70,7 @@ func New(conf *Config) (*Node, error) {
}
return &Node{
datadir: conf.DataDir,
config: &p2p.Server{
serverConfig: &p2p.Server{
PrivateKey: conf.NodeKey(),
Name: conf.Name,
Discovery: !conf.NoDiscovery,
@ -81,8 +85,9 @@ func New(conf *Config) (*Node, error) {
MaxPeers: conf.MaxPeers,
MaxPendingPeers: conf.MaxPendingPeers,
},
stack: make(map[string]ServiceConstructor),
emux: new(event.TypeMux),
serviceIndex: make(map[string]ServiceConstructor),
serviceOrder: []string{},
eventmux: new(event.TypeMux),
}, nil
}
@ -92,14 +97,15 @@ func (n *Node) Register(id string, constructor ServiceConstructor) error {
defer n.lock.Unlock()
// Short circuit if the node is running or if the id is taken
if n.running != nil {
if n.server != nil {
return ErrNodeRunning
}
if _, ok := n.stack[id]; ok {
if _, ok := n.serviceIndex[id]; ok {
return ErrServiceRegistered
}
// Otherwise register the service and return
n.stack[id] = constructor
n.serviceOrder = append(n.serviceOrder, id)
n.serviceIndex[id] = constructor
return nil
}
@ -111,14 +117,20 @@ func (n *Node) Unregister(id string) error {
defer n.lock.Unlock()
// Short circuit if the node is running, or if the service is unknown
if n.running != nil {
if n.server != nil {
return ErrNodeRunning
}
if _, ok := n.stack[id]; !ok {
if _, ok := n.serviceIndex[id]; !ok {
return ErrServiceUnknown
}
// Otherwise drop the service and return
delete(n.stack, id)
delete(n.serviceIndex, id)
for i, service := range n.serviceOrder {
if service == id {
n.serviceOrder = append(n.serviceOrder[:i], n.serviceOrder[i+1:]...)
break
}
}
return nil
}
@ -128,19 +140,27 @@ func (n *Node) Start() error {
defer n.lock.Unlock()
// Short circuit if the node's already running
if n.running != nil {
if n.server != nil {
return ErrNodeRunning
}
// Otherwise copy and specialize the P2P configuration
running := new(p2p.Server)
*running = *n.config
*running = *n.serverConfig
ctx := &ServiceContext{
dataDir: n.datadir,
EventMux: n.emux,
}
services := make(map[string]Service)
for id, constructor := range n.stack {
for _, id := range n.serviceOrder {
constructor := n.serviceIndex[id]
// Create a new context for the particular service
ctx := &ServiceContext{
datadir: n.datadir,
services: make(map[string]Service),
EventMux: n.eventmux,
}
for id, s := range services { // copy needed for threaded access
ctx.services[id] = s
}
// Construct and save the service
service, err := constructor(ctx)
if err != nil {
return err
@ -161,10 +181,12 @@ func (n *Node) Start() error {
started := []string{}
for id, service := range services {
// Start the next service, stopping all previous upon failure
if err := service.Start(); err != nil {
if err := service.Start(running); err != nil {
for _, id := range started {
services[id].Stop()
}
running.Stop()
return err
}
// Mark the service started for potential cleanup
@ -172,7 +194,8 @@ func (n *Node) Start() error {
}
// Finish initializing the startup
n.services = services
n.running = running
n.server = running
n.stop = make(chan struct{})
return nil
}
@ -184,7 +207,7 @@ func (n *Node) Stop() error {
defer n.lock.Unlock()
// Short circuit if the node's not running
if n.running == nil {
if n.server == nil {
return ErrNodeStopped
}
// Otherwise terminate all the services and the P2P server too
@ -196,10 +219,11 @@ func (n *Node) Stop() error {
failure.Services[id] = err
}
}
n.running.Stop()
n.server.Stop()
n.services = nil
n.running = nil
n.server = nil
close(n.stop)
if len(failure.Services) > 0 {
return failure
@ -207,6 +231,19 @@ func (n *Node) Stop() error {
return nil
}
// Wait blocks the thread until the node is stopped. If the node is not running
// at the time of invocation, the method immediately returns.
func (n *Node) Wait() {
n.lock.RLock()
if n.server == nil {
return
}
stop := n.stop
n.lock.RUnlock()
<-stop
}
// Restart terminates a running node and boots up a new one in its place. If the
// node isn't running, an error is returned.
func (n *Node) Restart() error {
@ -226,20 +263,45 @@ func (n *Node) Server() *p2p.Server {
n.lock.RLock()
defer n.lock.RUnlock()
return n.running
return n.server
}
// Service retrieves a currently running services registered under a given id.
// Service retrieves a currently running service registered under a given id.
func (n *Node) Service(id string) Service {
n.lock.RLock()
defer n.lock.RUnlock()
if n.services == nil {
// Short circuit if the node's not running
if n.server == nil {
return nil
}
return n.services[id]
}
// SingletonService retrieves a currently running service using a specific type
// implementing the Service interface. This is a utility function for scenarios
// where it is known that only one instance of a given service type is running,
// allowing to access services without needing to know their specific id with
// which they were registered. Note, this method uses reflection, so do not run
// in a tight loop.
func (n *Node) SingletonService(service interface{}) (string, error) {
n.lock.RLock()
defer n.lock.RUnlock()
// Short circuit if the node's not running
if n.server == nil {
return "", ErrServiceUnknown
}
// Otherwise try to find the service to return
for id, running := range n.services {
if reflect.TypeOf(running) == reflect.ValueOf(service).Elem().Type() {
reflect.ValueOf(service).Elem().Set(reflect.ValueOf(running))
return id, nil
}
}
return "", ErrServiceUnknown
}
// DataDir retrieves the current datadir used by the protocol stack.
func (n *Node) DataDir() string {
return n.datadir
@ -248,5 +310,5 @@ func (n *Node) DataDir() string {
// EventMux retrieves the event multiplexer used by all the network services in
// the current protocol stack.
func (n *Node) EventMux() *event.TypeMux {
return n.emux
return n.eventmux
}