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path: root/swarm/network/simulation/http_test.go
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// Copyright 2018 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 simulation

import (
    "context"
    "fmt"
    "net/http"
    "sync"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/log"
    "github.com/ethereum/go-ethereum/node"
    "github.com/ethereum/go-ethereum/p2p/simulations/adapters"
)

func TestSimulationWithHTTPServer(t *testing.T) {
    log.Debug("Init simulation")

    ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
    defer cancel()

    sim := New(
        map[string]ServiceFunc{
            "noop": func(_ *adapters.ServiceContext, b *sync.Map) (node.Service, func(), error) {
                return newNoopService(), nil, nil
            },
        }).WithServer(DefaultHTTPSimAddr)
    defer sim.Close()
    log.Debug("Done.")

    _, err := sim.AddNode()
    if err != nil {
        t.Fatal(err)
    }

    log.Debug("Starting sim round and let it time out...")
    //first test that running without sending to the channel will actually
    //block the simulation, so let it time out
    result := sim.Run(ctx, func(ctx context.Context, sim *Simulation) error {
        log.Debug("Just start the sim without any action and wait for the timeout")
        //ensure with a Sleep that simulation doesn't terminate before the timeout
        time.Sleep(2 * time.Second)
        return nil
    })

    if result.Error != nil {
        if result.Error.Error() == "context deadline exceeded" {
            log.Debug("Expected timeout error received")
        } else {
            t.Fatal(result.Error)
        }
    }

    //now run it again and send the expected signal on the waiting channel,
    //then close the simulation
    log.Debug("Starting sim round and wait for frontend signal...")
    //this time the timeout should be long enough so that it doesn't kick in too early
    ctx, cancel2 := context.WithTimeout(context.Background(), 5*time.Second)
    defer cancel2()
    errC := make(chan error, 1)
    go triggerSimulationRun(t, errC)
    result = sim.Run(ctx, func(ctx context.Context, sim *Simulation) error {
        log.Debug("This run waits for the run signal from `frontend`...")
        //ensure with a Sleep that simulation doesn't terminate before the signal is received
        time.Sleep(2 * time.Second)
        return nil
    })
    if result.Error != nil {
        t.Fatal(result.Error)
    }
    if err := <-errC; err != nil {
        t.Fatal(err)
    }
    log.Debug("Test terminated successfully")
}

func triggerSimulationRun(t *testing.T, errC chan error) {
    //We need to first wait for the sim HTTP server to start running...
    time.Sleep(2 * time.Second)
    //then we can send the signal

    log.Debug("Sending run signal to simulation: POST /runsim...")
    resp, err := http.Post(fmt.Sprintf("http://localhost%s/runsim", DefaultHTTPSimAddr), "application/json", nil)
    if err != nil {
        errC <- fmt.Errorf("Request failed: %v", err)
        return
    }
    log.Debug("Signal sent")
    if resp.StatusCode != http.StatusOK {
        errC <- fmt.Errorf("err %s", resp.Status)
        return
    }
    errC <- resp.Body.Close()
}