path: root/node/node_test.go

// 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 (
    "errors"
    "io/ioutil"
    "os"
    "reflect"
    "testing"

    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/p2p"
)

var (
    testNodeKey, _ = crypto.GenerateKey()

    testNodeConfig = &Config{
        PrivateKey: testNodeKey,
        Name:       "test node",
    }
)

// Tests that an empty protocol stack can be started, restarted and stopped.
func TestNodeLifeCycle(t *testing.T) {
    stack, err := New(testNodeConfig)
    if err != nil {
        t.Fatalf("failed to create protocol stack: %v", err)
    }
    // Ensure that a stopped node can be stopped again
    for i := 0; i < 3; i++ {
        if err := stack.Stop(); err != ErrNodeStopped {
            t.Fatalf("iter %d: stop failure mismatch: have %v, want %v", i, err, ErrNodeStopped)
        }
    }
    // Ensure that a node can be successfully started, but only once
    if err := stack.Start(); err != nil {
        t.Fatalf("failed to start node: %v", err)
    }
    if err := stack.Start(); err != ErrNodeRunning {
        t.Fatalf("start failure mismatch: have %v, want %v ", err, ErrNodeRunning)
    }
    // Ensure that a node can be restarted arbitrarily many times
    for i := 0; i < 3; i++ {
        if err := stack.Restart(); err != nil {
            t.Fatalf("iter %d: failed to restart node: %v", i, err)
        }
    }
    // Ensure that a node can be stopped, but only once
    if err := stack.Stop(); err != nil {
        t.Fatalf("failed to stop node: %v", err)
    }
    if err := stack.Stop(); err != ErrNodeStopped {
        t.Fatalf("stop failure mismatch: have %v, want %v ", err, ErrNodeStopped)
    }
}

// Tests that if the data dir is already in use, an appropriate error is returned.
func TestNodeUsedDataDir(t *testing.T) {
    // Create a temporary folder to use as the data directory
    dir, err := ioutil.TempDir("", "")
    if err != nil {
        t.Fatalf("failed to create temporary data directory: %v", err)
    }
    defer os.RemoveAll(dir)

    // Create a new node based on the data directory
    original, err := New(&Config{DataDir: dir})
    if err != nil {
        t.Fatalf("failed to create original protocol stack: %v", err)
    }
    if err := original.Start(); err != nil {
        t.Fatalf("failed to start original protocol stack: %v", err)
    }
    defer original.Stop()

    // Create a second node based on the same data directory and ensure failure
    duplicate, err := New(&Config{DataDir: dir})
    if err != nil {
        t.Fatalf("failed to create duplicate protocol stack: %v", err)
    }
    if err := duplicate.Start(); err != ErrDatadirUsed {
        t.Fatalf("duplicate datadir failure mismatch: have %v, want %v", err, ErrDatadirUsed)
    }
}

// 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)
    }
    // 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)
        }
    }
    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{})
        }
    }
}

// Tests that registered services get started and stopped correctly.
func TestServiceLifeCycle(t *testing.T) {
    stack, err := New(testNodeConfig)
    if err != nil {
        t.Fatalf("failed to create protocol stack: %v", err)
    }
    // Register a batch of life-cycle instrumented services
    services := map[string]InstrumentingWrapper{
        "A": InstrumentedServiceMakerA,
        "B": InstrumentedServiceMakerB,
        "C": InstrumentedServiceMakerC,
    }
    started := make(map[string]bool)
    stopped := make(map[string]bool)

    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 },
                stopHook:  func() { stopped[id] = true },
            }, nil
        }
        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 id, _ := range services {
        if !started[id] {
            t.Fatalf("service %s: freshly started service not running", id)
        }
        if stopped[id] {
            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 id, _ := range services {
        if !stopped[id] {
            t.Fatalf("service %s: freshly terminated service still running", id)
        }
    }
}

// Tests that services are restarted cleanly as new instances.
func TestServiceRestarts(t *testing.T) {
    stack, err := New(testNodeConfig)
    if err != nil {
        t.Fatalf("failed to create protocol stack: %v", err)
    }
    // Define a service that does not support restarts
    var (
        running bool
        started int
    )
    constructor := func(*ServiceContext) (Service, error) {
        running = false

        return &InstrumentedService{
            startHook: func(*p2p.Server) {
                if running {
                    panic("already running")
                }
                running = true
                started++
            },
        }, nil
    }
    // Register the service and start the protocol stack
    if err := stack.Register(constructor); err != nil {
        t.Fatalf("failed to register the service: %v", err)
    }
    if err := stack.Start(); err != nil {
        t.Fatalf("failed to start protocol stack: %v", err)
    }
    defer stack.Stop()

    if running != true || started != 1 {
        t.Fatalf("running/started mismatch: have %v/%d, want true/1", running, started)
    }
    // Restart the stack a few times and check successful service restarts
    for i := 0; i < 3; i++ {
        if err := stack.Restart(); err != nil {
            t.Fatalf("iter %d: failed to restart stack: %v", i, err)
        }
    }
    if running != true || started != 4 {
        t.Fatalf("running/started mismatch: have %v/%d, want true/4", running, started)
    }
}

// Tests that if a service fails to initialize itself, none of the other services
// will be allowed to even start.
func TestServiceConstructionAbortion(t *testing.T) {
    stack, err := New(testNodeConfig)
    if err != nil {
        t.Fatalf("failed to create protocol stack: %v", err)
    }
    // Define a batch of good services
    services := map[string]InstrumentingWrapper{
        "A": InstrumentedServiceMakerA,
        "B": InstrumentedServiceMakerB,
        "C": InstrumentedServiceMakerC,
    }
    started := make(map[string]bool)
    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(maker(constructor)); err != nil {
            t.Fatalf("service %s: registration failed: %v", id, err)
        }
    }
    // Register a service that fails to construct itself
    failure := errors.New("fail")
    failer := func(*ServiceContext) (Service, error) {
        return nil, failure
    }
    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
    for i := 0; i < 100; i++ {
        if err := stack.Start(); err != failure {
            t.Fatalf("iter %d: stack startup failure mismatch: have %v, want %v", i, err, failure)
        }
        for id, _ := range services {
            if started[id] {
                t.Fatalf("service %s: started should not have", id)
            }
            delete(started, id)
        }
    }
}

// Tests that if a service fails to start, all others started before it will be
// shut down.
func TestServiceStartupAbortion(t *testing.T) {
    stack, err := New(testNodeConfig)
    if err != nil {
        t.Fatalf("failed to create protocol stack: %v", err)
    }
    // Register a batch of good services
    services := map[string]InstrumentingWrapper{
        "A": InstrumentedServiceMakerA,
        "B": InstrumentedServiceMakerB,
        "C": InstrumentedServiceMakerC,
    }
    started := make(map[string]bool)
    stopped := make(map[string]bool)

    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 },
                stopHook:  func() { stopped[id] = true },
            }, nil
        }
        if err := stack.Register(maker(constructor)); err != nil {
            t.Fatalf("service %s: registration failed: %v", id, err)
        }
    }
    // Register a service that fails to start
    failure := errors.New("fail")
    failer := func(*ServiceContext) (Service, error) {
        return &InstrumentedService{
            start: failure,
        }, 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
    for i := 0; i < 100; i++ {
        if err := stack.Start(); err != failure {
            t.Fatalf("iter %d: stack startup failure mismatch: have %v, want %v", i, err, failure)
        }
        for id, _ := range services {
            if started[id] && !stopped[id] {
                t.Fatalf("service %s: started but not stopped", id)
            }
            delete(started, id)
            delete(stopped, id)
        }
    }
}

// Tests that even if a registered service fails to shut down cleanly, it does
// not influece the rest of the shutdown invocations.
func TestServiceTerminationGuarantee(t *testing.T) {
    stack, err := New(testNodeConfig)
    if err != nil {
        t.Fatalf("failed to create protocol stack: %v", err)
    }
    // Register a batch of good services
    services := map[string]InstrumentingWrapper{
        "A": InstrumentedServiceMakerA,
        "B": InstrumentedServiceMakerB,
        "C": InstrumentedServiceMakerC,
    }
    started := make(map[string]bool)
    stopped := make(map[string]bool)

    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 },
                stopHook:  func() { stopped[id] = true },
            }, nil
        }
        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
    failure := errors.New("fail")
    failer := func(*ServiceContext) (Service, error) {
        return &InstrumentedService{
            stop: failure,
        }, 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
    for i := 0; i < 100; i++ {
        // Start the stack and make sure all is online
        if err := stack.Start(); err != nil {
            t.Fatalf("iter %d: failed to start protocol stack: %v", i, err)
        }
        for id, _ := range services {
            if !started[id] {
                t.Fatalf("iter %d, service %s: service not running", i, id)
            }
            if stopped[id] {
                t.Fatalf("iter %d, service %s: service already stopped", i, id)
            }
        }
        // Stop the stack, verify failure and check all terminations
        err := stack.Stop()
        if err, ok := err.(*StopError); !ok {
            t.Fatalf("iter %d: termination failure mismatch: have %v, want StopError", i, err)
        } else {
            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 id, _ := range services {
            if !stopped[id] {
                t.Fatalf("iter %d, service %s: service not terminated", i, id)
            }
            delete(started, id)
            delete(stopped, id)
        }
    }
}

// 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(NewNoopService); err != nil {
        t.Fatalf("noop service registration failed: %v", err)
    }
    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 err := stack.Service(&noopServ); err != ErrNodeStopped {
        t.Fatalf("noop service retrieval mismatch: have %v, want %v", err, ErrNodeStopped)
    }
    var instServ *InstrumentedService
    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 {
        t.Fatalf("failed to start stack: %v", err)
    }
    defer stack.Stop()

    if err := stack.Service(&noopServ); err != nil {
        t.Fatalf("noop service retrieval mismatch: have %v, want %v", err, nil)
    }
    if err := stack.Service(&instServ); err != nil {
        t.Fatalf("instrumented service retrieval mismatch: have %v, want %v", err, nil)
    }
}

// Tests that all protocols defined by individual services get launched.
func TestProtocolGather(t *testing.T) {
    stack, err := New(testNodeConfig)
    if err != nil {
        t.Fatalf("failed to create protocol stack: %v", err)
    }
    // Register a batch of services with some configured number of protocols
    services := map[string]struct {
        Count int
        Maker InstrumentingWrapper
    }{
        "Zero Protocols":  {0, InstrumentedServiceMakerA},
        "Single Protocol": {1, InstrumentedServiceMakerB},
        "Many Protocols":  {25, InstrumentedServiceMakerC},
    }
    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)
        }
        constructor := func(*ServiceContext) (Service, error) {
            return &InstrumentedService{
                protocols: protocols,
            }, nil
        }
        if err := stack.Register(config.Maker(constructor)); err != nil {
            t.Fatalf("service %s: registration failed: %v", id, err)
        }
    }
    // Start the services and ensure all protocols start successfully
    if err := stack.Start(); err != nil {
        t.Fatalf("failed to start protocol stack: %v", err)
    }
    defer stack.Stop()

    protocols := stack.Server().Protocols
    if len(protocols) != 26 {
        t.Fatalf("mismatching number of protocols launched: have %d, want %d", len(protocols), 26)
    }
    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) {
                    launched = true
                    break
                }
            }
            if !launched {
                t.Errorf("configured protocol not launched: %s v%d", id, ver)
            }
        }
    }
}