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cmd, eth, node, rpc, xeth: use single-instance services

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This commit is contained in:
Péter Szilágyi 2015-11-26 18:35:44 +02:00
parent 1e806c4c77
commit 3e1000fda3
17 changed files with 330 additions and 295 deletions
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4
cmd/geth/js.go
View File

@ -345,7 +345,7 @@ func (self *jsre) AskPassword() (string, bool) {
func (self *jsre) ConfirmTransaction(tx string) bool {
// Retrieve the Ethereum instance from the node
var ethereum *eth.Ethereum
if _, err := self.stack.SingletonService(&ethereum); err != nil {
if err := self.stack.Service(&ethereum); err != nil {
return false
}
// If natspec is enabled, ask for permission
@ -367,7 +367,7 @@ func (self *jsre) UnlockAccount(addr []byte) bool {
}
// TODO: allow retry
var ethereum *eth.Ethereum
if _, err := self.stack.SingletonService(&ethereum); err != nil {
if err := self.stack.Service(&ethereum); err != nil {
return false
}
if err := ethereum.AccountManager().Unlock(common.BytesToAddress(addr), pass); err != nil {

14
cmd/geth/js_test.go
View File

@ -68,7 +68,7 @@ type testjethre struct {
func (self *testjethre) UnlockAccount(acc []byte) bool {
var ethereum *eth.Ethereum
self.stack.SingletonService(&ethereum)
self.stack.Service(&ethereum)
err := ethereum.AccountManager().Unlock(common.BytesToAddress(acc), "")
if err != nil {
@ -79,7 +79,7 @@ func (self *testjethre) UnlockAccount(acc []byte) bool {
func (self *testjethre) ConfirmTransaction(tx string) bool {
var ethereum *eth.Ethereum
self.stack.SingletonService(&ethereum)
self.stack.Service(&ethereum)
if ethereum.NatSpec {
self.lastConfirm = natspec.GetNotice(self.xeth, tx, self.client)
@ -118,7 +118,7 @@ func testREPL(t *testing.T, config func(*eth.Config)) (string, *testjethre, *nod
if config != nil {
config(ethConf)
}
if err := stack.Register("ethereum", func(ctx *node.ServiceContext) (node.Service, error) { return eth.New(ctx, ethConf) }); err != nil {
if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) { return eth.New(ctx, ethConf) }); err != nil {
t.Fatalf("failed to register ethereum protocol: %v", err)
}
// Initialize all the keys for testing
@ -138,7 +138,7 @@ func testREPL(t *testing.T, config func(*eth.Config)) (string, *testjethre, *nod
t.Fatalf("failed to start test stack: %v", err)
}
var ethereum *eth.Ethereum
stack.SingletonService(&ethereum)
stack.Service(&ethereum)
assetPath := filepath.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "cmd", "mist", "assets", "ext")
client := comms.NewInProcClient(codec.JSON)
@ -202,7 +202,7 @@ func TestBlockChain(t *testing.T) {
tmpfileq := strconv.Quote(tmpfile)
var ethereum *eth.Ethereum
node.SingletonService(&ethereum)
node.Service(&ethereum)
ethereum.BlockChain().Reset()
checkEvalJSON(t, repl, `admin.exportChain(`+tmpfileq+`)`, `true`)
@ -436,7 +436,7 @@ multiply7 = Multiply7.at(contractaddress);
func pendingTransactions(repl *testjethre, t *testing.T) (txc int64, err error) {
var ethereum *eth.Ethereum
repl.stack.SingletonService(&ethereum)
repl.stack.Service(&ethereum)
txs := ethereum.TxPool().GetTransactions()
return int64(len(txs)), nil
@ -464,7 +464,7 @@ func processTxs(repl *testjethre, t *testing.T, expTxc int) bool {
return false
}
var ethereum *eth.Ethereum
repl.stack.SingletonService(&ethereum)
repl.stack.Service(&ethereum)
err = ethereum.StartMining(runtime.NumCPU(), "")
if err != nil {

2
cmd/geth/main.go
View File

@ -489,7 +489,7 @@ func startNode(ctx *cli.Context, stack *node.Node) {
// Unlock any account specifically requested
var ethereum *eth.Ethereum
if _, err := stack.SingletonService(&ethereum); err != nil {
if err := stack.Service(&ethereum); err != nil {
utils.Fatalf("ethereum service not running: %v", err)
}
accman := ethereum.AccountManager()

6
cmd/gethrpctest/main.go
View File

@ -126,11 +126,11 @@ func MakeSystemNode(keydir string, privkey string, test *tests.BlockTest) (*node
TestGenesisBlock: test.Genesis,
AccountManager: accman,
}
if err := stack.Register("ethereum", func(ctx *node.ServiceContext) (node.Service, error) { return eth.New(ctx, ethConf) }); err != nil {
if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) { return eth.New(ctx, ethConf) }); err != nil {
return nil, err
}
// Initialize and register the Whisper protocol
if err := stack.Register("whisper", func(*node.ServiceContext) (node.Service, error) { return whisper.New(), nil }); err != nil {
if err := stack.Register(func(*node.ServiceContext) (node.Service, error) { return whisper.New(), nil }); err != nil {
return nil, err
}
return stack, nil
@ -140,7 +140,7 @@ func MakeSystemNode(keydir string, privkey string, test *tests.BlockTest) (*node
// stack to ensure basic checks pass before running RPC tests.
func RunTest(stack *node.Node, test *tests.BlockTest) error {
var ethereum *eth.Ethereum
stack.SingletonService(&ethereum)
stack.Service(&ethereum)
blockchain := ethereum.BlockChain()
// Process the blocks and verify the imported headers

10
cmd/utils/flags.go
View File

@ -686,13 +686,13 @@ func MakeSystemNode(name, version string, extra []byte, ctx *cli.Context) *node.
if err != nil {
Fatalf("Failed to create the protocol stack: %v", err)
}
if err := stack.Register("eth", func(ctx *node.ServiceContext) (node.Service, error) {
if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
return eth.New(ctx, ethConf)
}); err != nil {
Fatalf("Failed to register the Ethereum service: %v", err)
}
if shhEnable {
if err := stack.Register("shh", func(*node.ServiceContext) (node.Service, error) { return whisper.New(), nil }); err != nil {
if err := stack.Register(func(*node.ServiceContext) (node.Service, error) { return whisper.New(), nil }); err != nil {
Fatalf("Failed to register the Whisper service: %v", err)
}
}
@ -786,7 +786,11 @@ func StartIPC(stack *node.Node, ctx *cli.Context) error {
}
initializer := func(conn net.Conn) (comms.Stopper, shared.EthereumApi, error) {
fe := useragent.NewRemoteFrontend(conn, stack.Service("eth").(*eth.Ethereum).AccountManager())
var ethereum *eth.Ethereum
if err := stack.Service(&ethereum); err != nil {
return nil, nil, err
}
fe := useragent.NewRemoteFrontend(conn, ethereum.AccountManager())
xeth := xeth.New(stack, fe)
apis, err := api.ParseApiString(ctx.GlobalString(IPCApiFlag.Name), codec.JSON, xeth, stack)
if err != nil {

4
eth/backend.go
View File

@ -135,7 +135,7 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
ethdb.OpenFileLimit = 128 / (dbCount + 1)
// Open the chain database and perform any upgrades needed
chainDb, err := ctx.Database("chaindata", config.DatabaseCache)
chainDb, err := ctx.OpenDatabase("chaindata", config.DatabaseCache)
if err != nil {
return nil, err
}
@ -149,7 +149,7 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
return nil, err
}
dappDb, err := ctx.Database("dapp", config.DatabaseCache)
dappDb, err := ctx.OpenDatabase("dapp", config.DatabaseCache)
if err != nil {
return nil, err
}

20
node/errors.go
View File

@ -16,13 +16,27 @@
package node
import "fmt"
import (
"fmt"
"reflect"
)
// StopError is returned if a node fails to stop either any of its registered
// DuplicateServiceError is returned during Node startup if a registered service
// constructor returns a service of the same type that was already started.
type DuplicateServiceError struct {
Kind reflect.Type
}
// Error generates a textual representation of the duplicate service error.
func (e *DuplicateServiceError) Error() string {
return fmt.Sprintf("duplicate service: %v", e.Kind)
}
// StopError is returned if a Node fails to stop either any of its registered
// services or itself.
type StopError struct {
Server error
Services map[string]error
Services map[reflect.Type]error
}
// Error generates a textual representation of the stop error.

126
node/node.go
View File

@ -30,16 +30,16 @@ import (
)
var (
ErrDatadirUsed = errors.New("datadir already used")
ErrNodeStopped = errors.New("node not started")
ErrNodeRunning = errors.New("node already running")
ErrServiceUnknown = errors.New("service not registered")
ErrServiceRegistered = errors.New("service already registered")
ErrDatadirUsed = errors.New("datadir already used")
ErrNodeStopped = errors.New("node not started")
ErrNodeRunning = errors.New("node already running")
ErrServiceUnknown = errors.New("unknown service")
datadirInUseErrnos = map[uint]bool{11: true, 32: true, 35: true}
)
// Node represents a P2P node into which arbitrary services might be registered.
// Node represents a P2P node into which arbitrary (uniquely typed) services might
// be registered.
type Node struct {
datadir string // Path to the currently used data directory
eventmux *event.TypeMux // Event multiplexer used between the services of a stack
@ -47,9 +47,8 @@ type Node struct {
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
serviceFuncs []ServiceConstructor // Service constructors (in dependency order)
services map[reflect.Type]Service // Currently running services
stop chan struct{} // Channel to wait for termination notifications
lock sync.RWMutex
@ -85,52 +84,21 @@ func New(conf *Config) (*Node, error) {
MaxPeers: conf.MaxPeers,
MaxPendingPeers: conf.MaxPendingPeers,
},
serviceIndex: make(map[string]ServiceConstructor),
serviceOrder: []string{},
serviceFuncs: []ServiceConstructor{},
eventmux: new(event.TypeMux),
}, nil
}
// Register injects a new service into the node's stack.
func (n *Node) Register(id string, constructor ServiceConstructor) error {
// Register injects a new service into the node's stack. The service created by
// the passed constructor must be unique in its type with regard to sibling ones.
func (n *Node) Register(constructor ServiceConstructor) error {
n.lock.Lock()
defer n.lock.Unlock()
// Short circuit if the node is running or if the id is taken
if n.server != nil {
return ErrNodeRunning
}
if _, ok := n.serviceIndex[id]; ok {
return ErrServiceRegistered
}
// Otherwise register the service and return
n.serviceOrder = append(n.serviceOrder, id)
n.serviceIndex[id] = constructor
return nil
}
// Unregister removes a service from a node's stack. If the node is currently
// running, an error will be returned.
func (n *Node) Unregister(id string) error {
n.lock.Lock()
defer n.lock.Unlock()
// Short circuit if the node is running, or if the service is unknown
if n.server != nil {
return ErrNodeRunning
}
if _, ok := n.serviceIndex[id]; !ok {
return ErrServiceUnknown
}
// Otherwise drop the service and return
delete(n.serviceIndex, id)
for i, service := range n.serviceOrder {
if service == id {
n.serviceOrder = append(n.serviceOrder[:i], n.serviceOrder[i+1:]...)
break
}
}
n.serviceFuncs = append(n.serviceFuncs, constructor)
return nil
}
@ -147,25 +115,27 @@ func (n *Node) Start() error {
running := new(p2p.Server)
*running = *n.serverConfig
services := make(map[string]Service)
for _, id := range n.serviceOrder {
constructor := n.serviceIndex[id]
services := make(map[reflect.Type]Service)
for _, constructor := range n.serviceFuncs {
// Create a new context for the particular service
ctx := &ServiceContext{
datadir: n.datadir,
services: make(map[string]Service),
services: make(map[reflect.Type]Service),
EventMux: n.eventmux,
}
for id, s := range services { // copy needed for threaded access
ctx.services[id] = s
for kind, s := range services { // copy needed for threaded access
ctx.services[kind] = s
}
// Construct and save the service
service, err := constructor(ctx)
if err != nil {
return err
}
services[id] = service
kind := reflect.TypeOf(service)
if _, exists := services[kind]; exists {
return &DuplicateServiceError{Kind: kind}
}
services[kind] = service
}
// Gather the protocols and start the freshly assembled P2P server
for _, service := range services {
@ -178,19 +148,19 @@ func (n *Node) Start() error {
return err
}
// Start each of the services
started := []string{}
for id, service := range services {
started := []reflect.Type{}
for kind, service := range services {
// Start the next service, stopping all previous upon failure
if err := service.Start(running); err != nil {
for _, id := range started {
services[id].Stop()
for _, kind := range started {
services[kind].Stop()
}
running.Stop()
return err
}
// Mark the service started for potential cleanup
started = append(started, id)
started = append(started, kind)
}
// Finish initializing the startup
n.services = services
@ -212,11 +182,11 @@ func (n *Node) Stop() error {
}
// Otherwise terminate all the services and the P2P server too
failure := &StopError{
Services: make(map[string]error),
Services: make(map[reflect.Type]error),
}
for id, service := range n.services {
for kind, service := range n.services {
if err := service.Stop(); err != nil {
failure.Services[id] = err
failure.Services[kind] = err
}
}
n.server.Stop()
@ -266,40 +236,22 @@ func (n *Node) Server() *p2p.Server {
return n.server
}
// Service retrieves a currently running service registered under a given id.
func (n *Node) Service(id string) Service {
// Service retrieves a currently running service registered of a specific type.
func (n *Node) Service(service interface{}) error {
n.lock.RLock()
defer n.lock.RUnlock()
// 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
return ErrNodeStopped
}
// 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
}
element := reflect.ValueOf(service).Elem()
if running, ok := n.services[element.Type()]; ok {
element.Set(reflect.ValueOf(running))
return nil
}
return "", ErrServiceUnknown
return ErrServiceUnknown
}
// DataDir retrieves the current datadir used by the protocol stack.

2
node/node_example_test.go
View File

@ -66,7 +66,7 @@ func ExampleUsage() {
constructor := func(context *node.ServiceContext) (node.Service, error) {
return new(SampleService), nil
}
if err := stack.Register("my sample service", constructor); err != nil {
if err := stack.Register(constructor); err != nil {
log.Fatalf("Failed to register service: %v", err)
}
// Boot up the entire protocol stack, do a restart and terminate

230
node/node_test.go
View File

@ -20,6 +20,7 @@ import (
"errors"
"io/ioutil"
"os"
"reflect"
"testing"
"github.com/ethereum/go-ethereum/crypto"
@ -98,79 +99,36 @@ func TestNodeUsedDataDir(t *testing.T) {
}
}
// NoopService is a trivial implementation of the Service interface.
type NoopService struct{}
func (s *NoopService) Protocols() []p2p.Protocol { return nil }
func (s *NoopService) Start(*p2p.Server) error { return nil }
func (s *NoopService) Stop() error { return nil }
func NewNoopService(*ServiceContext) (Service, error) { return new(NoopService), nil }
// Tests whether services can be registered and unregistered.
// Tests whether services can be registered and duplicates caught.
func TestServiceRegistry(t *testing.T) {
stack, err := New(testNodeConfig)
if err != nil {
t.Fatalf("failed to create protocol stack: %v", err)
}
// Create a batch of dummy services and ensure they don't exist
ids := []string{"A", "B", "C"}
for i, id := range ids {
if err := stack.Unregister(id); err != ErrServiceUnknown {
t.Fatalf("service %d: pre-unregistration failure mismatch: have %v, want %v", i, err, ErrServiceUnknown)
// Register a batch of unique services and ensure they start successfully
services := []ServiceConstructor{NewNoopServiceA, NewNoopServiceB, NewNoopServiceC}
for i, constructor := range services {
if err := stack.Register(constructor); err != nil {
t.Fatalf("service #%d: registration failed: %v", i, err)
}
}
// Register the services, checking that the operation succeeds only once
for i, id := range ids {
if err := stack.Register(id, NewNoopService); err != nil {
t.Fatalf("service %d: registration failed: %v", i, err)
}
if err := stack.Register(id, NewNoopService); err != ErrServiceRegistered {
t.Fatalf("service %d: registration failure mismatch: have %v, want %v", i, err, ErrServiceRegistered)
if err := stack.Start(); err != nil {
t.Fatalf("failed to start original service stack: %v", err)
}
if err := stack.Stop(); err != nil {
t.Fatalf("failed to stop original service stack: %v", err)
}
// Duplicate one of the services and retry starting the node
if err := stack.Register(NewNoopServiceB); err != nil {
t.Fatalf("duplicate registration failed: %v", err)
}
if err := stack.Start(); err == nil {
t.Fatalf("duplicate service started")
} else {
if _, ok := err.(*DuplicateServiceError); !ok {
t.Fatalf("duplicate error mismatch: have %v, want %v", err, DuplicateServiceError{})
}
}
// Unregister the services, checking that the operation succeeds only once
for i, id := range ids {
if err := stack.Unregister(id); err != nil {
t.Fatalf("service %d: unregistration failed: %v", i, err)
}
if err := stack.Unregister(id); err != ErrServiceUnknown {
t.Fatalf("service %d: unregistration failure mismatch: have %v, want %v", i, err, ErrServiceUnknown)
}
}
}
// InstrumentedService is an implementation of Service for which all interface
// methods can be instrumented both return value as well as event hook wise.
type InstrumentedService struct {
protocols []p2p.Protocol
start error
stop error
protocolsHook func()
startHook func(*p2p.Server)
stopHook func()
}
func (s *InstrumentedService) Protocols() []p2p.Protocol {
if s.protocolsHook != nil {
s.protocolsHook()
}
return s.protocols
}
func (s *InstrumentedService) Start(server *p2p.Server) error {
if s.startHook != nil {
s.startHook(server)
}
return s.start
}
func (s *InstrumentedService) Stop() error {
if s.stopHook != nil {
s.stopHook()
}
return s.stop
}
// Tests that registered services get started and stopped correctly.
@ -180,12 +138,15 @@ func TestServiceLifeCycle(t *testing.T) {
t.Fatalf("failed to create protocol stack: %v", err)
}
// Register a batch of life-cycle instrumented services
ids := []string{"A", "B", "C"}
services := map[string]InstrumentingWrapper{
"A": InstrumentedServiceMakerA,
"B": InstrumentedServiceMakerB,
"C": InstrumentedServiceMakerC,
}
started := make(map[string]bool)
stopped := make(map[string]bool)
for i, id := range ids {
for id, maker := range services {
id := id // Closure for the constructor
constructor := func(*ServiceContext) (Service, error) {
return &InstrumentedService{
@ -193,35 +154,29 @@ func TestServiceLifeCycle(t *testing.T) {
stopHook: func() { stopped[id] = true },
}, nil
}
if err := stack.Register(id, constructor); err != nil {
t.Fatalf("service %d: registration failed: %v", i, err)
if err := stack.Register(maker(constructor)); err != nil {
t.Fatalf("service %s: registration failed: %v", id, err)
}
}
// Start the node and check that all services are running
if err := stack.Start(); err != nil {
t.Fatalf("failed to start protocol stack: %v", err)
}
for i, id := range ids {
for id, _ := range services {
if !started[id] {
t.Fatalf("service %d: freshly started service not running", i)
t.Fatalf("service %s: freshly started service not running", id)
}
if stopped[id] {
t.Fatalf("service %d: freshly started service already stopped", i)
}
if stack.Service(id) == nil {
t.Fatalf("service %d: freshly started service unaccessible", i)
t.Fatalf("service %s: freshly started service already stopped", id)
}
}
// Stop the node and check that all services have been stopped
if err := stack.Stop(); err != nil {
t.Fatalf("failed to stop protocol stack: %v", err)
}
for i, id := range ids {
for id, _ := range services {
if !stopped[id] {
t.Fatalf("service %d: freshly terminated service still running", i)
}
if service := stack.Service(id); service != nil {
t.Fatalf("service %d: freshly terminated service still accessible: %v", i, service)
t.Fatalf("service %s: freshly terminated service still running", id)
}
}
}
@ -251,7 +206,7 @@ func TestServiceRestarts(t *testing.T) {
}, nil
}
// Register the service and start the protocol stack
if err := stack.Register("service", constructor); err != nil {
if err := stack.Register(constructor); err != nil {
t.Fatalf("failed to register the service: %v", err)
}
if err := stack.Start(); err != nil {
@ -281,18 +236,21 @@ func TestServiceConstructionAbortion(t *testing.T) {
t.Fatalf("failed to create protocol stack: %v", err)
}
// Define a batch of good services
ids := []string{"A", "B", "C", "D", "E", "F"}
services := map[string]InstrumentingWrapper{
"A": InstrumentedServiceMakerA,
"B": InstrumentedServiceMakerB,
"C": InstrumentedServiceMakerC,
}
started := make(map[string]bool)
for i, id := range ids {
for id, maker := range services {
id := id // Closure for the constructor
constructor := func(*ServiceContext) (Service, error) {
return &InstrumentedService{
startHook: func(*p2p.Server) { started[id] = true },
}, nil
}
if err := stack.Register(id, constructor); err != nil {
t.Fatalf("service %d: registration failed: %v", i, err)
if err := stack.Register(maker(constructor)); err != nil {
t.Fatalf("service %s: registration failed: %v", id, err)
}
}
// Register a service that fails to construct itself
@ -300,7 +258,7 @@ func TestServiceConstructionAbortion(t *testing.T) {
failer := func(*ServiceContext) (Service, error) {
return nil, failure
}
if err := stack.Register("failer", failer); err != nil {
if err := stack.Register(failer); err != nil {
t.Fatalf("failer registration failed: %v", err)
}
// Start the protocol stack and ensure none of the services get started
@ -308,9 +266,9 @@ func TestServiceConstructionAbortion(t *testing.T) {
if err := stack.Start(); err != failure {
t.Fatalf("iter %d: stack startup failure mismatch: have %v, want %v", i, err, failure)
}
for i, id := range ids {
for id, _ := range services {
if started[id] {
t.Fatalf("service %d: started should not have", i)
t.Fatalf("service %s: started should not have", id)
}
delete(started, id)
}
@ -325,12 +283,15 @@ func TestServiceStartupAbortion(t *testing.T) {
t.Fatalf("failed to create protocol stack: %v", err)
}
// Register a batch of good services
ids := []string{"A", "B", "C", "D", "E", "F"}
services := map[string]InstrumentingWrapper{
"A": InstrumentedServiceMakerA,
"B": InstrumentedServiceMakerB,
"C": InstrumentedServiceMakerC,
}
started := make(map[string]bool)
stopped := make(map[string]bool)
for i, id := range ids {
for id, maker := range services {
id := id // Closure for the constructor
constructor := func(*ServiceContext) (Service, error) {
return &InstrumentedService{
@ -338,8 +299,8 @@ func TestServiceStartupAbortion(t *testing.T) {
stopHook: func() { stopped[id] = true },
}, nil
}
if err := stack.Register(id, constructor); err != nil {
t.Fatalf("service %d: registration failed: %v", i, err)
if err := stack.Register(maker(constructor)); err != nil {
t.Fatalf("service %s: registration failed: %v", id, err)
}
}
// Register a service that fails to start
@ -349,7 +310,7 @@ func TestServiceStartupAbortion(t *testing.T) {
start: failure,
}, nil
}
if err := stack.Register("failer", failer); err != nil {
if err := stack.Register(failer); err != nil {
t.Fatalf("failer registration failed: %v", err)
}
// Start the protocol stack and ensure all started services stop
@ -357,9 +318,9 @@ func TestServiceStartupAbortion(t *testing.T) {
if err := stack.Start(); err != failure {
t.Fatalf("iter %d: stack startup failure mismatch: have %v, want %v", i, err, failure)
}
for i, id := range ids {
for id, _ := range services {
if started[id] && !stopped[id] {
t.Fatalf("service %d: started but not stopped", i)
t.Fatalf("service %s: started but not stopped", id)
}
delete(started, id)
delete(stopped, id)
@ -375,12 +336,15 @@ func TestServiceTerminationGuarantee(t *testing.T) {
t.Fatalf("failed to create protocol stack: %v", err)
}
// Register a batch of good services
ids := []string{"A", "B", "C", "D", "E", "F"}
services := map[string]InstrumentingWrapper{
"A": InstrumentedServiceMakerA,
"B": InstrumentedServiceMakerB,
"C": InstrumentedServiceMakerC,
}
started := make(map[string]bool)
stopped := make(map[string]bool)
for i, id := range ids {
for id, maker := range services {
id := id // Closure for the constructor
constructor := func(*ServiceContext) (Service, error) {
return &InstrumentedService{
@ -388,8 +352,8 @@ func TestServiceTerminationGuarantee(t *testing.T) {
stopHook: func() { stopped[id] = true },
}, nil
}
if err := stack.Register(id, constructor); err != nil {
t.Fatalf("service %d: registration failed: %v", i, err)
if err := stack.Register(maker(constructor)); err != nil {
t.Fatalf("service %s: registration failed: %v", id, err)
}
}
// Register a service that fails to shot down cleanly
@ -399,7 +363,7 @@ func TestServiceTerminationGuarantee(t *testing.T) {
stop: failure,
}, nil
}
if err := stack.Register("failer", failer); err != nil {
if err := stack.Register(failer); err != nil {
t.Fatalf("failer registration failed: %v", err)
}
// Start the protocol stack, and ensure that a failing shut down terminates all
@ -408,12 +372,12 @@ func TestServiceTerminationGuarantee(t *testing.T) {
if err := stack.Start(); err != nil {
t.Fatalf("iter %d: failed to start protocol stack: %v", i, err)
}
for j, id := range ids {
for id, _ := range services {
if !started[id] {
t.Fatalf("iter %d, service %d: service not running", i, j)
t.Fatalf("iter %d, service %s: service not running", i, id)
}
if stopped[id] {
t.Fatalf("iter %d, service %d: service already stopped", i, j)
t.Fatalf("iter %d, service %s: service already stopped", i, id)
}
}
// Stop the stack, verify failure and check all terminations
@ -421,16 +385,17 @@ func TestServiceTerminationGuarantee(t *testing.T) {
if err, ok := err.(*StopError); !ok {
t.Fatalf("iter %d: termination failure mismatch: have %v, want StopError", i, err)
} else {
if err.Services["failer"] != failure {
t.Fatalf("iter %d: failer termination failure mismatch: have %v, want %v", i, err.Services["failer"], failure)
failer := reflect.TypeOf(&InstrumentedService{})
if err.Services[failer] != failure {
t.Fatalf("iter %d: failer termination failure mismatch: have %v, want %v", i, err.Services[failer], failure)
}
if len(err.Services) != 1 {
t.Fatalf("iter %d: failure count mismatch: have %d, want %d", i, len(err.Services), 1)
}
}
for j, id := range ids {
for id, _ := range services {
if !stopped[id] {
t.Fatalf("iter %d, service %d: service not terminated", i, j)
t.Fatalf("iter %d, service %s: service not terminated", i, id)
}
delete(started, id)
delete(stopped, id)
@ -438,27 +403,27 @@ func TestServiceTerminationGuarantee(t *testing.T) {
}
}
// TestSingletonServiceRetrieval tests that singleton services can be retrieved.
func TestSingletonServiceRetrieval(t *testing.T) {
// TestServiceRetrieval tests that individual services can be retrieved.
func TestServiceRetrieval(t *testing.T) {
// Create a simple stack and register two service types
stack, err := New(testNodeConfig)
if err != nil {
t.Fatalf("failed to create protocol stack: %v", err)
}
if err := stack.Register("noop", func(*ServiceContext) (Service, error) { return new(NoopService), nil }); err != nil {
if err := stack.Register(NewNoopService); err != nil {
t.Fatalf("noop service registration failed: %v", err)
}
if err := stack.Register("instrumented", func(*ServiceContext) (Service, error) { return new(InstrumentedService), nil }); err != nil {
if err := stack.Register(NewInstrumentedService); err != nil {
t.Fatalf("instrumented service registration failed: %v", err)
}
// Make sure none of the services can be retrieved until started
var noopServ *NoopService
if id, err := stack.SingletonService(&noopServ); id != "" || err != ErrServiceUnknown {
t.Fatalf("noop service retrieval mismatch: have %v/%v, want %v/%v", id, err, "", ErrServiceUnknown)
if err := stack.Service(&noopServ); err != ErrNodeStopped {
t.Fatalf("noop service retrieval mismatch: have %v, want %v", err, ErrNodeStopped)
}
var instServ *InstrumentedService
if id, err := stack.SingletonService(&instServ); id != "" || err != ErrServiceUnknown {
t.Fatalf("instrumented service retrieval mismatch: have %v/%v, want %v/%v", id, err, "", ErrServiceUnknown)
if err := stack.Service(&instServ); err != ErrNodeStopped {
t.Fatalf("instrumented service retrieval mismatch: have %v, want %v", err, ErrNodeStopped)
}
// Start the stack and ensure everything is retrievable now
if err := stack.Start(); err != nil {
@ -466,11 +431,11 @@ func TestSingletonServiceRetrieval(t *testing.T) {
}
defer stack.Stop()
if id, err := stack.SingletonService(&noopServ); id != "noop" || err != nil {
t.Fatalf("noop service retrieval mismatch: have %v/%v, want %v/%v", id, err, "noop", nil)
if err := stack.Service(&noopServ); err != nil {
t.Fatalf("noop service retrieval mismatch: have %v, want %v", err, nil)
}
if id, err := stack.SingletonService(&instServ); id != "instrumented" || err != nil {
t.Fatalf("instrumented service retrieval mismatch: have %v/%v, want %v/%v", id, err, "instrumented", nil)
if err := stack.Service(&instServ); err != nil {
t.Fatalf("instrumented service retrieval mismatch: have %v, want %v", err, nil)
}
}
@ -481,13 +446,16 @@ func TestProtocolGather(t *testing.T) {
t.Fatalf("failed to create protocol stack: %v", err)
}
// Register a batch of services with some configured number of protocols
services := map[string]int{
"Zero Protocols": 0,
"Single Protocol": 1,
"Many Protocols": 25,
services := map[string]struct {
Count int
Maker InstrumentingWrapper
}{
"Zero Protocols": {0, InstrumentedServiceMakerA},
"Single Protocol": {1, InstrumentedServiceMakerB},
"Many Protocols": {25, InstrumentedServiceMakerC},
}
for id, count := range services {
protocols := make([]p2p.Protocol, count)
for id, config := range services {
protocols := make([]p2p.Protocol, config.Count)
for i := 0; i < len(protocols); i++ {
protocols[i].Name = id
protocols[i].Version = uint(i)
@ -497,7 +465,7 @@ func TestProtocolGather(t *testing.T) {
protocols: protocols,
}, nil
}
if err := stack.Register(id, constructor); err != nil {
if err := stack.Register(config.Maker(constructor)); err != nil {
t.Fatalf("service %s: registration failed: %v", id, err)
}
}
@ -511,8 +479,8 @@ func TestProtocolGather(t *testing.T) {
if len(protocols) != 26 {
t.Fatalf("mismatching number of protocols launched: have %d, want %d", len(protocols), 26)
}
for id, count := range services {
for ver := 0; ver < count; ver++ {
for id, config := range services {
for ver := 0; ver < config.Count; ver++ {
launched := false
for i := 0; i < len(protocols); i++ {
if protocols[i].Name == id && protocols[i].Version == uint(ver) {

38
node/service.go
View File

@ -29,39 +29,29 @@ import (
// the protocol stack, that is passed to all constructors to be optionally used;
// as well as utility methods to operate on the service environment.
type ServiceContext struct {
datadir string // Data directory for protocol persistence
services map[string]Service // Index of the already constructed services
EventMux *event.TypeMux // Event multiplexer used for decoupled notifications
datadir string // Data directory for protocol persistence
services map[reflect.Type]Service // Index of the already constructed services
EventMux *event.TypeMux // Event multiplexer used for decoupled notifications
}
// Database opens an existing database with the given name (or creates one if no
// previous can be found) from within the node's data directory. If the node is
// an ephemeral one, a memory database is returned.
func (ctx *ServiceContext) Database(name string, cache int) (ethdb.Database, error) {
// OpenDatabase opens an existing database with the given name (or creates one
// if no previous can be found) from within the node's data directory. If the
// node is an ephemeral one, a memory database is returned.
func (ctx *ServiceContext) OpenDatabase(name string, cache int) (ethdb.Database, error) {
if ctx.datadir == "" {
return ethdb.NewMemDatabase()
}
return ethdb.NewLDBDatabase(filepath.Join(ctx.datadir, name), cache)
}
// Service retrieves an already constructed service registered under a given id.
func (ctx *ServiceContext) Service(id string) Service {
return ctx.services[id]
}
// SingletonService retrieves an already constructed 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.
func (ctx *ServiceContext) SingletonService(service interface{}) (string, error) {
for id, running := range ctx.services {
if reflect.TypeOf(running) == reflect.ValueOf(service).Elem().Type() {
reflect.ValueOf(service).Elem().Set(reflect.ValueOf(running))
return id, nil
}
// Service retrieves a currently running service registered of a specific type.
func (ctx *ServiceContext) Service(service interface{}) error {
element := reflect.ValueOf(service).Elem()
if running, ok := ctx.services[element.Type()]; ok {
element.Set(reflect.ValueOf(running))
return nil
}
return "", ErrServiceUnknown
return ErrServiceUnknown
}
// ServiceConstructor is the function signature of the constructors needed to be

37
node/service_test.go
View File

@ -39,7 +39,7 @@ func TestContextDatabases(t *testing.T) {
}
// Request the opening/creation of a database and ensure it persists to disk
ctx := &ServiceContext{datadir: dir}
db, err := ctx.Database("persistent", 0)
db, err := ctx.OpenDatabase("persistent", 0)
if err != nil {
t.Fatalf("failed to open persistent database: %v", err)
}
@ -50,7 +50,7 @@ func TestContextDatabases(t *testing.T) {
}
// Request th opening/creation of an ephemeral database and ensure it's not persisted
ctx = &ServiceContext{datadir: ""}
db, err = ctx.Database("ephemeral", 0)
db, err = ctx.OpenDatabase("ephemeral", 0)
if err != nil {
t.Fatalf("failed to open ephemeral database: %v", err)
}
@ -67,36 +67,27 @@ func TestContextServices(t *testing.T) {
if err != nil {
t.Fatalf("failed to create protocol stack: %v", err)
}
// Define a set of services, constructed before/after a verifier
formers := []string{"A", "B", "C", "D", "E", "F", "G", "H", "I", "J"}
latters := []string{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"}
// Define a verifier that ensures a NoopA is before it and NoopB after
verifier := func(ctx *ServiceContext) (Service, error) {
for i, id := range formers {
if ctx.Service(id) == nil {
return nil, fmt.Errorf("former %d: service not found", i)
}
var objA *NoopServiceA
if ctx.Service(&objA) != nil {
return nil, fmt.Errorf("former service not found")
}
for i, id := range latters {
if ctx.Service(id) != nil {
return nil, fmt.Errorf("latters %d: service found", i)
}
var objB *NoopServiceB
if err := ctx.Service(&objB); err != ErrServiceUnknown {
return nil, fmt.Errorf("latters lookup error mismatch: have %v, want %v", err, ErrServiceUnknown)
}
return new(NoopService), nil
}
// Register the collection of services
for i, id := range formers {
if err := stack.Register(id, NewNoopService); err != nil {
t.Fatalf("former #%d: failed to register service: %v", i, err)
}
if err := stack.Register(NewNoopServiceA); err != nil {
t.Fatalf("former failed to register service: %v", err)
}
if err := stack.Register("verifier", verifier); err != nil {
if err := stack.Register(verifier); err != nil {
t.Fatalf("failed to register service verifier: %v", err)
}
for i, id := range latters {
if err := stack.Register(id, NewNoopService); err != nil {
t.Fatalf("latter #%d: failed to register service: %v", i, err)
}
if err := stack.Register(NewNoopServiceB); err != nil {
t.Fatalf("latter failed to register service: %v", err)
}
// Start the protocol stack and ensure services are constructed in order
if err := stack.Start(); err != nil {

117
node/utils_test.go Normal file
View File

@ -0,0 +1,117 @@
// 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/>.
// Contains a batch of utility type declarations used by the tests. As the node
// operates on unique types, a lot of them are needed to check various features.
package node
import (
"reflect"
"github.com/ethereum/go-ethereum/p2p"
)
// NoopService is a trivial implementation of the Service interface.
type NoopService struct{}
func (s *NoopService) Protocols() []p2p.Protocol { return nil }
func (s *NoopService) Start(*p2p.Server) error { return nil }
func (s *NoopService) Stop() error { return nil }
func NewNoopService(*ServiceContext) (Service, error) { return new(NoopService), nil }
// Set of services all wrapping the base NoopService resulting in the same method
// signatures but different outer types.
type NoopServiceA struct{ NoopService }
type NoopServiceB struct{ NoopService }
type NoopServiceC struct{ NoopService }
type NoopServiceD struct{ NoopService }
func NewNoopServiceA(*ServiceContext) (Service, error) { return new(NoopServiceA), nil }
func NewNoopServiceB(*ServiceContext) (Service, error) { return new(NoopServiceB), nil }
func NewNoopServiceC(*ServiceContext) (Service, error) { return new(NoopServiceC), nil }
func NewNoopServiceD(*ServiceContext) (Service, error) { return new(NoopServiceD), nil }
// InstrumentedService is an implementation of Service for which all interface
// methods can be instrumented both return value as well as event hook wise.
type InstrumentedService struct {
protocols []p2p.Protocol
start error
stop error
protocolsHook func()
startHook func(*p2p.Server)
stopHook func()
}
func NewInstrumentedService(*ServiceContext) (Service, error) { return new(InstrumentedService), nil }
func (s *InstrumentedService) Protocols() []p2p.Protocol {
if s.protocolsHook != nil {
s.protocolsHook()
}
return s.protocols
}
func (s *InstrumentedService) Start(server *p2p.Server) error {
if s.startHook != nil {
s.startHook(server)
}
return s.start
}
func (s *InstrumentedService) Stop() error {
if s.stopHook != nil {
s.stopHook()
}
return s.stop
}
// InstrumentingWrapper is a method to specialize a service constructor returning
// a generic InstrumentedService into one returning a wrapping specific one.
type InstrumentingWrapper func(base ServiceConstructor) ServiceConstructor
func InstrumentingWrapperMaker(base ServiceConstructor, kind reflect.Type) ServiceConstructor {
return func(ctx *ServiceContext) (Service, error) {
obj, err := base(ctx)
if err != nil {
return nil, err
}
wrapper := reflect.New(kind)
wrapper.Elem().Field(0).Set(reflect.ValueOf(obj).Elem())
return wrapper.Interface().(Service), nil
}
}
// Set of services all wrapping the base InstrumentedService resulting in the
// same method signatures but different outer types.
type InstrumentedServiceA struct{ InstrumentedService }
type InstrumentedServiceB struct{ InstrumentedService }
type InstrumentedServiceC struct{ InstrumentedService }
func InstrumentedServiceMakerA(base ServiceConstructor) ServiceConstructor {
return InstrumentingWrapperMaker(base, reflect.TypeOf(InstrumentedServiceA{}))
}
func InstrumentedServiceMakerB(base ServiceConstructor) ServiceConstructor {
return InstrumentingWrapperMaker(base, reflect.TypeOf(InstrumentedServiceB{}))
}
func InstrumentedServiceMakerC(base ServiceConstructor) ServiceConstructor {
return InstrumentingWrapperMaker(base, reflect.TypeOf(InstrumentedServiceC{}))
}

2
rpc/api/admin.go
View File

@ -97,7 +97,7 @@ func NewAdminApi(xeth *xeth.XEth, stack *node.Node, codec codec.Codec) *adminApi
coder: codec.New(nil),
}
if stack != nil {
stack.SingletonService(&api.ethereum)
stack.Service(&api.ethereum)
}
return api
}

2
rpc/api/utils.go
View File

@ -165,7 +165,7 @@ func ParseApiString(apistr string, codec codec.Codec, xeth *xeth.XEth, stack *no
var eth *eth.Ethereum
if stack != nil {
if _, err := stack.SingletonService(&eth); err != nil {
if err := stack.Service(&eth); err != nil {
return nil, err
}
}

3
xeth/state.go
View File

@ -19,7 +19,6 @@ package xeth
import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/eth"
)
type State struct {
@ -46,7 +45,7 @@ func (self *State) SafeGet(addr string) *Object {
func (self *State) safeGet(addr string) *state.StateObject {
object := self.state.GetStateObject(common.HexToAddress(addr))
if object == nil {
object = state.NewStateObject(common.HexToAddress(addr), self.xeth.backend.Service("eth").(*eth.Ethereum).ChainDb())
object = state.NewStateObject(common.HexToAddress(addr), self.xeth.EthereumService().ChainDb())
}
return object
}

8
xeth/xeth.go
View File

@ -100,8 +100,8 @@ func New(stack *node.Node, frontend Frontend) *XEth {
ethereum *eth.Ethereum
whisper *whisper.Whisper
)
stack.SingletonService(&ethereum)
stack.SingletonService(&whisper)
stack.Service(&ethereum)
stack.Service(&whisper)
xeth := &XEth{
backend: stack,
@ -130,7 +130,7 @@ func New(stack *node.Node, frontend Frontend) *XEth {
func (self *XEth) EthereumService() *eth.Ethereum {
var ethereum *eth.Ethereum
if _, err := self.backend.SingletonService(&ethereum); err != nil {
if err := self.backend.Service(&ethereum); err != nil {
return nil
}
return ethereum
@ -138,7 +138,7 @@ func (self *XEth) EthereumService() *eth.Ethereum {
func (self *XEth) WhisperService() *whisper.Whisper {
var whisper *whisper.Whisper
if _, err := self.backend.SingletonService(&whisper); err != nil {
if err := self.backend.Service(&whisper); err != nil {
return nil
}
return whisper