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lookup.go
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lookup.go
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// Copyright 2021 The Swarm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// package testing provides tests for update and resolution of time-based feeds
package testing
import (
"bytes"
"context"
"encoding/binary"
"errors"
"fmt"
"math/rand"
"testing"
"time"
"github.com/ethersphere/bee/pkg/crypto"
"github.com/ethersphere/bee/pkg/feeds"
"github.com/ethersphere/bee/pkg/storage"
"github.com/ethersphere/bee/pkg/storage/mock"
"github.com/ethersphere/bee/pkg/swarm"
)
type Timeout struct {
storage.Storer
}
var searchTimeout = 30 * time.Millisecond
// Get overrides the mock storer and introduces latency
func (t *Timeout) Get(ctx context.Context, mode storage.ModeGet, addr swarm.Address) (swarm.Chunk, error) {
ch, err := t.Storer.Get(ctx, mode, addr)
if err != nil {
if errors.Is(err, storage.ErrNotFound) {
time.Sleep(searchTimeout)
}
return ch, err
}
time.Sleep(time.Duration(rand.Intn(10)) * time.Millisecond)
return ch, nil
}
func TestFinderBasic(t *testing.T, finderf func(storage.Getter, *feeds.Feed) feeds.Lookup, updaterf func(putter storage.Putter, signer crypto.Signer, topic []byte) (feeds.Updater, error)) {
storer := &Timeout{mock.NewStorer()}
topicStr := "testtopic"
topic, err := crypto.LegacyKeccak256([]byte(topicStr))
if err != nil {
t.Fatal(err)
}
pk, _ := crypto.GenerateSecp256k1Key()
signer := crypto.NewDefaultSigner(pk)
updater, err := updaterf(storer, signer, topic)
if err != nil {
t.Fatal(err)
}
ctx := context.Background()
finder := finderf(storer, updater.Feed())
t.Run("no update", func(t *testing.T) {
ch, err := feeds.Latest(ctx, finder, 0)
if err != nil {
t.Fatal(err)
}
if ch != nil {
t.Fatalf("expected no update, got addr %v", ch.Address())
}
})
t.Run("first update", func(t *testing.T) {
payload := []byte("payload")
at := time.Now().Unix()
err = updater.Update(ctx, at, payload)
if err != nil {
t.Fatal(err)
}
ch, err := feeds.Latest(ctx, finder, 0)
if err != nil {
t.Fatal(err)
}
if ch == nil {
t.Fatalf("expected to find update, got none")
}
exp := payload
ts, payload, err := feeds.FromChunk(ch)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(payload, exp) {
t.Fatalf("result mismatch. want %8x... got %8x...", exp, payload)
}
if ts != uint64(at) {
t.Fatalf("timestamp mismatch: expected %v, got %v", at, ts)
}
})
}
func TestFinderFixIntervals(t *testing.T, nextf func() (bool, int64), finderf func(storage.Getter, *feeds.Feed) feeds.Lookup, updaterf func(putter storage.Putter, signer crypto.Signer, topic []byte) (feeds.Updater, error)) {
var stop bool
for j := 10; !stop; j += 10 {
t.Run(fmt.Sprintf("custom intervals up to %d", j), func(t *testing.T) {
var i int64
var n int
f := func() (bool, int64) {
n++
stop, i = nextf()
return n == j || stop, i
}
TestFinderIntervals(t, f, finderf, updaterf)
})
}
}
func TestFinderIntervals(t *testing.T, nextf func() (bool, int64), finderf func(storage.Getter, *feeds.Feed) feeds.Lookup, updaterf func(putter storage.Putter, signer crypto.Signer, topic []byte) (feeds.Updater, error)) {
storer := &Timeout{mock.NewStorer()}
topicStr := "testtopic"
topic, err := crypto.LegacyKeccak256([]byte(topicStr))
if err != nil {
t.Fatal(err)
}
pk, _ := crypto.GenerateSecp256k1Key()
signer := crypto.NewDefaultSigner(pk)
updater, err := updaterf(storer, signer, topic)
if err != nil {
t.Fatal(err)
}
finder := finderf(storer, updater.Feed())
ctx := context.Background()
var ats []int64
for stop, at := nextf(); !stop; stop, at = nextf() {
ats = append(ats, at)
payload := make([]byte, 8)
binary.BigEndian.PutUint64(payload, uint64(at))
err = updater.Update(ctx, at, payload)
if err != nil {
t.Fatal(err)
}
}
for j := 0; j < len(ats)-1; j++ {
at := ats[j]
diff := ats[j+1] - at
for now := at; now < ats[j+1]; now += int64(rand.Intn(int(diff)) + 1) {
after := int64(0)
ch, current, next, err := finder.At(ctx, now, after)
if err != nil {
t.Fatal(err)
}
if ch == nil {
t.Fatalf("expected to find update, got none")
}
ts, payload, err := feeds.FromChunk(ch)
if err != nil {
t.Fatal(err)
}
content := binary.BigEndian.Uint64(payload)
if content != uint64(at) {
t.Fatalf("payload mismatch: expected %v, got %v", at, content)
}
if ts != uint64(at) {
t.Fatalf("timestamp mismatch: expected %v, got %v", at, ts)
}
if current != nil {
expectedId := ch.Data()[:32]
id, err := feeds.Id(topic, current)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(id, expectedId) {
t.Fatalf("current mismatch: expected %x, got %x", expectedId, id)
}
}
if next != nil {
expectedNext := current.Next(at, uint64(now))
expectedIdx, err := expectedNext.MarshalBinary()
if err != nil {
t.Fatal(err)
}
idx, err := next.MarshalBinary()
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(idx, expectedIdx) {
t.Fatalf("next mismatch: expected %x, got %x", expectedIdx, idx)
}
}
}
}
}
func TestFinderRandomIntervals(t *testing.T, finderf func(storage.Getter, *feeds.Feed) feeds.Lookup, updaterf func(putter storage.Putter, signer crypto.Signer, topic []byte) (feeds.Updater, error)) {
for j := 0; j < 3; j++ {
t.Run(fmt.Sprintf("random intervals %d", j), func(t *testing.T) {
var i int64
var n int
nextf := func() (bool, int64) {
i += int64(rand.Intn(1<<10) + 1)
n++
return n == 40, i
}
TestFinderIntervals(t, nextf, finderf, updaterf)
})
}
}