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Merge pull request #2458 from arkodg/fix-flaky-tests

Browse source 
Fix flaky NetworkDB tests
This commit is contained in:
elangovan sivanandam 2019-10-04 16:50:31 -04:00 committed by GitHub
commit 01f67061b5
13 changed files with 474 additions and 347 deletions
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67
libnetwork/networkdb/networkdb_test.go
View file

@ -17,6 +17,7 @@ import (
"github.com/sirupsen/logrus"
"gotest.tools/assert"
is "gotest.tools/assert/cmp"
"gotest.tools/poll"
// this takes care of the incontainer flag
_ "github.com/docker/libnetwork/testutils"
@ -51,13 +52,17 @@ func createNetworkDBInstances(t *testing.T, num int, namePrefix string, conf *Co
dbs = append(dbs, db)
}
// Check that the cluster is properly created
for i := 0; i < num; i++ {
if num != len(dbs[i].ClusterPeers()) {
t.Fatalf("Number of nodes for %s into the cluster does not match %d != %d",
dbs[i].config.Hostname, num, len(dbs[i].ClusterPeers()))
// Wait till the cluster creation is successful
check := func(t poll.LogT) poll.Result {
// Check that the cluster is properly created
for i := 0; i < num; i++ {
if num != len(dbs[i].ClusterPeers()) {
return poll.Continue("%s:Waiting for cluser peers to be established", dbs[i].config.Hostname)
}
}
return poll.Success()
}
poll.WaitOn(t, check, poll.WithDelay(2*time.Second), poll.WithTimeout(20*time.Second))
return dbs
}
@ -826,39 +831,51 @@ func TestNetworkDBIslands(t *testing.T) {
for i := 0; i < 3; i++ {
logrus.Infof("node %d leaving", i)
dbs[i].Close()
time.Sleep(2 * time.Second)
}
// Give some time to let the system propagate the messages and free up the ports
time.Sleep(10 * time.Second)
// Verify that the nodes are actually all gone and marked appropiately
for i := 3; i < 5; i++ {
assert.Check(t, is.Len(dbs[i].leftNodes, 3))
assert.Check(t, is.Len(dbs[i].failedNodes, 0))
check := func(t poll.LogT) poll.Result {
// Verify that the nodes are actually all gone and marked appropiately
for i := 3; i < 5; i++ {
if (len(dbs[i].leftNodes) != 3) || (len(dbs[i].failedNodes) != 0) {
return poll.Continue("%s:Waiting for all nodes to cleanly leave", dbs[i].config.Hostname)
}
}
return poll.Success()
}
poll.WaitOn(t, check, poll.WithDelay(20*time.Second), poll.WithTimeout(120*time.Second))
// Spawn again the first 3 nodes with different names but same IP:port
for i := 0; i < 3; i++ {
logrus.Infof("node %d coming back", i)
dbs[i].config.NodeID = stringid.TruncateID(stringid.GenerateRandomID())
dbs[i] = launchNode(t, *dbs[i].config)
time.Sleep(2 * time.Second)
}
// Give some time for the reconnect routine to run, it runs every 60s
time.Sleep(50 * time.Second)
// Verify that the cluster is again all connected. Note that the 3 previous node did not do any join
for i := 0; i < 5; i++ {
assert.Check(t, is.Len(dbs[i].nodes, 5))
assert.Check(t, is.Len(dbs[i].failedNodes, 0))
if i < 3 {
// nodes from 0 to 3 has no left nodes
assert.Check(t, is.Len(dbs[i].leftNodes, 0))
} else {
// nodes from 4 to 5 has the 3 previous left nodes
assert.Check(t, is.Len(dbs[i].leftNodes, 3))
check = func(t poll.LogT) poll.Result {
// Verify that the cluster is again all connected. Note that the 3 previous node did not do any join
for i := 0; i < 5; i++ {
if len(dbs[i].nodes) != 5 {
return poll.Continue("%s:Waiting to connect to all nodes", dbs[i].config.Hostname)
}
if len(dbs[i].failedNodes) != 0 {
return poll.Continue("%s:Waiting for 0 failedNodes", dbs[i].config.Hostname)
}
if i < 3 {
// nodes from 0 to 3 has no left nodes
if len(dbs[i].leftNodes) != 0 {
return poll.Continue("%s:Waiting to have no leftNodes", dbs[i].config.Hostname)
}
} else {
// nodes from 4 to 5 has the 3 previous left nodes
if len(dbs[i].leftNodes) != 3 {
return poll.Continue("%s:Waiting to have 3 leftNodes", dbs[i].config.Hostname)
}
}
}
return poll.Success()
}
poll.WaitOn(t, check, poll.WithDelay(20*time.Second), poll.WithTimeout(120*time.Second))
closeNetworkDBInstances(dbs)
}

2
libnetwork/vendor.conf
View file

@ -51,5 +51,5 @@ golang.org/x/sync 1d60e4601c6fd243af51cc01ddf169918a5407ca
github.com/pkg/errors ba968bfe8b2f7e042a574c888954fccecfa385b4 # v0.8.1
github.com/ishidawataru/sctp 6e2cb1366111dcf547c13531e3a263a067715847
gotest.tools b6e20af1ed078cd01a6413b734051a292450b4cb # v2.1.0
gotest.tools 1083505acf35a0bd8a696b26837e1fb3187a7a83 # v2.3.0
github.com/google/go-cmp 3af367b6b30c263d47e8895973edcca9a49cf029 # v0.2.0

209
libnetwork/vendor/gotest.tools/LICENSE vendored
View file

@ -1,202 +1,13 @@
Copyright 2018 gotest.tools authors
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
http://www.apache.org/licenses/LICENSE-2.0
1. Definitions.
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otherwise, or (ii) ownership of fifty percent (50%) or more of the
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"You" (or "Your") shall mean an individual or Legal Entity
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whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
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incurred by, or claims asserted against, such Contributor by reason
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APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
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Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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Unless required by applicable law or agreed to in writing, software
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
limitations under the License.

6
libnetwork/vendor/gotest.tools/README.md vendored
View file

@ -3,7 +3,7 @@
A collection of packages to augment `testing` and support common patterns.
[![GoDoc](https://godoc.org/gotest.tools?status.svg)](https://godoc.org/gotest.tools)
[![CircleCI](https://circleci.com/gh/gotestyourself/gotestyourself/tree/master.svg?style=shield)](https://circleci.com/gh/gotestyourself/gotestyourself/tree/master)
[![CircleCI](https://circleci.com/gh/gotestyourself/gotest.tools/tree/master.svg?style=shield)](https://circleci.com/gh/gotestyourself/gotest.tools/tree/master)
[![Go Reportcard](https://goreportcard.com/badge/gotest.tools)](https://goreportcard.com/report/gotest.tools)
@ -29,3 +29,7 @@ A collection of packages to augment `testing` and support common patterns.
* [gotest.tools/gotestsum](https://github.com/gotestyourself/gotestsum) - go test runner with custom output
* [maxbrunsfeld/counterfeiter](https://github.com/maxbrunsfeld/counterfeiter) - generate fakes for interfaces
* [jonboulle/clockwork](https://github.com/jonboulle/clockwork) - a fake clock for testing code that uses `time`
## Contributing
See [CONTRIBUTING.md](CONTRIBUTING.md).

48
libnetwork/vendor/gotest.tools/assert/cmp/compare.go vendored
View file

@ -4,6 +4,7 @@ package cmp // import "gotest.tools/assert/cmp"
import (
"fmt"
"reflect"
"regexp"
"strings"
"github.com/google/go-cmp/cmp"
@ -58,6 +59,39 @@ func toResult(success bool, msg string) Result {
return ResultFailure(msg)
}
// RegexOrPattern may be either a *regexp.Regexp or a string that is a valid
// regexp pattern.
type RegexOrPattern interface{}
// Regexp succeeds if value v matches regular expression re.
//
// Example:
// assert.Assert(t, cmp.Regexp("^[0-9a-f]{32}$", str))
// r := regexp.MustCompile("^[0-9a-f]{32}$")
// assert.Assert(t, cmp.Regexp(r, str))
func Regexp(re RegexOrPattern, v string) Comparison {
match := func(re *regexp.Regexp) Result {
return toResult(
re.MatchString(v),
fmt.Sprintf("value %q does not match regexp %q", v, re.String()))
}
return func() Result {
switch regex := re.(type) {
case *regexp.Regexp:
return match(regex)
case string:
re, err := regexp.Compile(regex)
if err != nil {
return ResultFailure(err.Error())
}
return match(re)
default:
return ResultFailure(fmt.Sprintf("invalid type %T for regex pattern", regex))
}
}
}
// Equal succeeds if x == y. See assert.Equal for full documentation.
func Equal(x, y interface{}) Comparison {
return func() Result {
@ -186,7 +220,7 @@ func Error(err error, message string) Comparison {
return ResultFailure("expected an error, got nil")
case err.Error() != message:
return ResultFailure(fmt.Sprintf(
"expected error %q, got %+v", message, err))
"expected error %q, got %s", message, formatErrorMessage(err)))
}
return ResultSuccess
}
@ -201,12 +235,22 @@ func ErrorContains(err error, substring string) Comparison {
return ResultFailure("expected an error, got nil")
case !strings.Contains(err.Error(), substring):
return ResultFailure(fmt.Sprintf(
"expected error to contain %q, got %+v", substring, err))
"expected error to contain %q, got %s", substring, formatErrorMessage(err)))
}
return ResultSuccess
}
}
func formatErrorMessage(err error) string {
if _, ok := err.(interface {
Cause() error
}); ok {
return fmt.Sprintf("%q\n%+v", err, err)
}
// This error was not wrapped with github.com/pkg/errors
return fmt.Sprintf("%q", err)
}
// Nil succeeds if obj is a nil interface, pointer, or function.
//
// Use NilError() for comparing errors. Use Len(obj, 0) for comparing slices,

20
libnetwork/vendor/gotest.tools/assert/cmp/result.go vendored
View file

@ -9,31 +9,37 @@ import (
"gotest.tools/internal/source"
)
// Result of a Comparison.
// A Result of a Comparison.
type Result interface {
Success() bool
}
type result struct {
// StringResult is an implementation of Result that reports the error message
// string verbatim and does not provide any templating or formatting of the
// message.
type StringResult struct {
success bool
message string
}
func (r result) Success() bool {
// Success returns true if the comparison was successful.
func (r StringResult) Success() bool {
return r.success
}
func (r result) FailureMessage() string {
// FailureMessage returns the message used to provide additional information
// about the failure.
func (r StringResult) FailureMessage() string {
return r.message
}
// ResultSuccess is a constant which is returned by a ComparisonWithResult to
// indicate success.
var ResultSuccess = result{success: true}
var ResultSuccess = StringResult{success: true}
// ResultFailure returns a failed Result with a failure message.
func ResultFailure(message string) Result {
return result{message: message}
func ResultFailure(message string) StringResult {
return StringResult{message: message}
}
// ResultFromError returns ResultSuccess if err is nil. Otherwise ResultFailure

1
libnetwork/vendor/gotest.tools/assert/result.go vendored
View file

@ -70,7 +70,6 @@ func filterPrintableExpr(args []ast.Expr) []ast.Expr {
result[i] = starExpr.X
continue
}
result[i] = nil
}
return result
}

8
libnetwork/vendor/gotest.tools/go.mod vendored Normal file
View file

@ -0,0 +1,8 @@
module gotest.tools
require (
github.com/google/go-cmp v0.2.0
github.com/pkg/errors v0.8.0
github.com/spf13/pflag v1.0.3
golang.org/x/tools v0.0.0-20180810170437-e96c4e24768d
)

25
libnetwork/vendor/gotest.tools/internal/difflib/difflib.go vendored
View file

@ -1,4 +1,4 @@
/* Package difflib is a partial port of Python difflib module.
/*Package difflib is a partial port of Python difflib module.
Original source: https://github.com/pmezard/go-difflib
@ -20,12 +20,14 @@ func max(a, b int) int {
return b
}
// Match stores line numbers of size of match
type Match struct {
A int
B int
Size int
}
// OpCode identifies the type of diff
type OpCode struct {
Tag byte
I1 int
@ -73,19 +75,20 @@ type SequenceMatcher struct {
opCodes []OpCode
}
// NewMatcher returns a new SequenceMatcher
func NewMatcher(a, b []string) *SequenceMatcher {
m := SequenceMatcher{autoJunk: true}
m.SetSeqs(a, b)
return &m
}
// Set two sequences to be compared.
// SetSeqs sets two sequences to be compared.
func (m *SequenceMatcher) SetSeqs(a, b []string) {
m.SetSeq1(a)
m.SetSeq2(b)
}
// Set the first sequence to be compared. The second sequence to be compared is
// SetSeq1 sets the first sequence to be compared. The second sequence to be compared is
// not changed.
//
// SequenceMatcher computes and caches detailed information about the second
@ -103,7 +106,7 @@ func (m *SequenceMatcher) SetSeq1(a []string) {
m.opCodes = nil
}
// Set the second sequence to be compared. The first sequence to be compared is
// SetSeq2 sets the second sequence to be compared. The first sequence to be compared is
// not changed.
func (m *SequenceMatcher) SetSeq2(b []string) {
if &b == &m.b {
@ -129,12 +132,12 @@ func (m *SequenceMatcher) chainB() {
m.bJunk = map[string]struct{}{}
if m.IsJunk != nil {
junk := m.bJunk
for s, _ := range b2j {
for s := range b2j {
if m.IsJunk(s) {
junk[s] = struct{}{}
}
}
for s, _ := range junk {
for s := range junk {
delete(b2j, s)
}
}
@ -149,7 +152,7 @@ func (m *SequenceMatcher) chainB() {
popular[s] = struct{}{}
}
}
for s, _ := range popular {
for s := range popular {
delete(b2j, s)
}
}
@ -259,7 +262,7 @@ func (m *SequenceMatcher) findLongestMatch(alo, ahi, blo, bhi int) Match {
return Match{A: besti, B: bestj, Size: bestsize}
}
// Return list of triples describing matching subsequences.
// GetMatchingBlocks returns a list of triples describing matching subsequences.
//
// Each triple is of the form (i, j, n), and means that
// a[i:i+n] == b[j:j+n]. The triples are monotonically increasing in
@ -323,7 +326,7 @@ func (m *SequenceMatcher) GetMatchingBlocks() []Match {
return m.matchingBlocks
}
// Return list of 5-tuples describing how to turn a into b.
// GetOpCodes returns a list of 5-tuples describing how to turn a into b.
//
// Each tuple is of the form (tag, i1, i2, j1, j2). The first tuple
// has i1 == j1 == 0, and remaining tuples have i1 == the i2 from the
@ -374,7 +377,7 @@ func (m *SequenceMatcher) GetOpCodes() []OpCode {
return m.opCodes
}
// Isolate change clusters by eliminating ranges with no changes.
// GetGroupedOpCodes isolates change clusters by eliminating ranges with no changes.
//
// Return a generator of groups with up to n lines of context.
// Each group is in the same format as returned by GetOpCodes().
@ -384,7 +387,7 @@ func (m *SequenceMatcher) GetGroupedOpCodes(n int) [][]OpCode {
}
codes := m.GetOpCodes()
if len(codes) == 0 {
codes = []OpCode{OpCode{'e', 0, 1, 0, 1}}
codes = []OpCode{{'e', 0, 1, 0, 1}}
}
// Fixup leading and trailing groups if they show no changes.
if codes[0].Tag == 'e' {

53
libnetwork/vendor/gotest.tools/internal/source/defers.go vendored Normal file
View file

@ -0,0 +1,53 @@
package source
import (
"go/ast"
"go/token"
"github.com/pkg/errors"
)
func scanToDeferLine(fileset *token.FileSet, node ast.Node, lineNum int) ast.Node {
var matchedNode ast.Node
ast.Inspect(node, func(node ast.Node) bool {
switch {
case node == nil || matchedNode != nil:
return false
case fileset.Position(node.End()).Line == lineNum:
if funcLit, ok := node.(*ast.FuncLit); ok {
matchedNode = funcLit
return false
}
}
return true
})
debug("defer line node: %s", debugFormatNode{matchedNode})
return matchedNode
}
func guessDefer(node ast.Node) (ast.Node, error) {
defers := collectDefers(node)
switch len(defers) {
case 0:
return nil, errors.New("failed to expression in defer")
case 1:
return defers[0].Call, nil
default:
return nil, errors.Errorf(
"ambiguous call expression: multiple (%d) defers in call block",
len(defers))
}
}
func collectDefers(node ast.Node) []*ast.DeferStmt {
var defers []*ast.DeferStmt
ast.Inspect(node, func(node ast.Node) bool {
if d, ok := node.(*ast.DeferStmt); ok {
defers = append(defers, d)
debug("defer: %s", debugFormatNode{d})
return false
}
return true
})
return defers
}

203
libnetwork/vendor/gotest.tools/internal/source/source.go vendored
View file

@ -24,106 +24,12 @@ func FormattedCallExprArg(stackIndex int, argPos int) (string, error) {
if err != nil {
return "", err
}
if argPos >= len(args) {
return "", errors.New("failed to find expression")
}
return FormatNode(args[argPos])
}
func getNodeAtLine(filename string, lineNum int) (ast.Node, error) {
fileset := token.NewFileSet()
astFile, err := parser.ParseFile(fileset, filename, nil, parser.AllErrors)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse source file: %s", filename)
}
node := scanToLine(fileset, astFile, lineNum)
if node == nil {
return nil, errors.Errorf(
"failed to find an expression on line %d in %s", lineNum, filename)
}
return node, nil
}
func scanToLine(fileset *token.FileSet, node ast.Node, lineNum int) ast.Node {
v := &scanToLineVisitor{lineNum: lineNum, fileset: fileset}
ast.Walk(v, node)
return v.matchedNode
}
type scanToLineVisitor struct {
lineNum int
matchedNode ast.Node
fileset *token.FileSet
}
func (v *scanToLineVisitor) Visit(node ast.Node) ast.Visitor {
if node == nil || v.matchedNode != nil {
return nil
}
if v.nodePosition(node).Line == v.lineNum {
v.matchedNode = node
return nil
}
return v
}
// In golang 1.9 the line number changed from being the line where the statement
// ended to the line where the statement began.
func (v *scanToLineVisitor) nodePosition(node ast.Node) token.Position {
if goVersionBefore19 {
return v.fileset.Position(node.End())
}
return v.fileset.Position(node.Pos())
}
var goVersionBefore19 = isGOVersionBefore19()
func isGOVersionBefore19() bool {
version := runtime.Version()
// not a release version
if !strings.HasPrefix(version, "go") {
return false
}
version = strings.TrimPrefix(version, "go")
parts := strings.Split(version, ".")
if len(parts) < 2 {
return false
}
minor, err := strconv.ParseInt(parts[1], 10, 32)
return err == nil && parts[0] == "1" && minor < 9
}
func getCallExprArgs(node ast.Node) ([]ast.Expr, error) {
visitor := &callExprVisitor{}
ast.Walk(visitor, node)
if visitor.expr == nil {
return nil, errors.New("failed to find call expression")
}
return visitor.expr.Args, nil
}
type callExprVisitor struct {
expr *ast.CallExpr
}
func (v *callExprVisitor) Visit(node ast.Node) ast.Visitor {
if v.expr != nil || node == nil {
return nil
}
debug("visit (%T): %s", node, debugFormatNode{node})
if callExpr, ok := node.(*ast.CallExpr); ok {
v.expr = callExpr
return nil
}
return v
}
// FormatNode using go/format.Node and return the result as a string
func FormatNode(node ast.Node) (string, error) {
buf := new(bytes.Buffer)
err := format.Node(buf, token.NewFileSet(), node)
return buf.String(), err
}
// CallExprArgs returns the ast.Expr slice for the args of an ast.CallExpr at
// the index in the call stack.
func CallExprArgs(stackIndex int) ([]ast.Expr, error) {
@ -137,12 +43,109 @@ func CallExprArgs(stackIndex int) ([]ast.Expr, error) {
if err != nil {
return nil, err
}
debug("found node (%T): %s", node, debugFormatNode{node})
debug("found node: %s", debugFormatNode{node})
return getCallExprArgs(node)
}
var debugEnabled = os.Getenv("GOTESTYOURSELF_DEBUG") != ""
func getNodeAtLine(filename string, lineNum int) (ast.Node, error) {
fileset := token.NewFileSet()
astFile, err := parser.ParseFile(fileset, filename, nil, parser.AllErrors)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse source file: %s", filename)
}
if node := scanToLine(fileset, astFile, lineNum); node != nil {
return node, nil
}
if node := scanToDeferLine(fileset, astFile, lineNum); node != nil {
node, err := guessDefer(node)
if err != nil || node != nil {
return node, err
}
}
return nil, errors.Errorf(
"failed to find an expression on line %d in %s", lineNum, filename)
}
func scanToLine(fileset *token.FileSet, node ast.Node, lineNum int) ast.Node {
var matchedNode ast.Node
ast.Inspect(node, func(node ast.Node) bool {
switch {
case node == nil || matchedNode != nil:
return false
case nodePosition(fileset, node).Line == lineNum:
matchedNode = node
return false
}
return true
})
return matchedNode
}
// In golang 1.9 the line number changed from being the line where the statement
// ended to the line where the statement began.
func nodePosition(fileset *token.FileSet, node ast.Node) token.Position {
if goVersionBefore19 {
return fileset.Position(node.End())
}
return fileset.Position(node.Pos())
}
var goVersionBefore19 = func() bool {
version := runtime.Version()
// not a release version
if !strings.HasPrefix(version, "go") {
return false
}
version = strings.TrimPrefix(version, "go")
parts := strings.Split(version, ".")
if len(parts) < 2 {
return false
}
minor, err := strconv.ParseInt(parts[1], 10, 32)
return err == nil && parts[0] == "1" && minor < 9
}()
func getCallExprArgs(node ast.Node) ([]ast.Expr, error) {
visitor := &callExprVisitor{}
ast.Walk(visitor, node)
if visitor.expr == nil {
return nil, errors.New("failed to find call expression")
}
debug("callExpr: %s", debugFormatNode{visitor.expr})
return visitor.expr.Args, nil
}
type callExprVisitor struct {
expr *ast.CallExpr
}
func (v *callExprVisitor) Visit(node ast.Node) ast.Visitor {
if v.expr != nil || node == nil {
return nil
}
debug("visit: %s", debugFormatNode{node})
switch typed := node.(type) {
case *ast.CallExpr:
v.expr = typed
return nil
case *ast.DeferStmt:
ast.Walk(v, typed.Call.Fun)
return nil
}
return v
}
// FormatNode using go/format.Node and return the result as a string
func FormatNode(node ast.Node) (string, error) {
buf := new(bytes.Buffer)
err := format.Node(buf, token.NewFileSet(), node)
return buf.String(), err
}
var debugEnabled = os.Getenv("GOTESTTOOLS_DEBUG") != ""
func debug(format string, args ...interface{}) {
if debugEnabled {
@ -159,5 +162,5 @@ func (n debugFormatNode) String() string {
if err != nil {
return fmt.Sprintf("failed to format %s: %s", n.Node, err)
}
return out
return fmt.Sprintf("(%T) %s", n.Node, out)
}

39
libnetwork/vendor/gotest.tools/poll/check.go vendored Normal file
View file

@ -0,0 +1,39 @@
package poll
import (
"net"
"os"
)
// Check is a function which will be used as check for the WaitOn method.
type Check func(t LogT) Result
// FileExists looks on filesystem and check that path exists.
func FileExists(path string) Check {
return func(t LogT) Result {
_, err := os.Stat(path)
if os.IsNotExist(err) {
t.Logf("waiting on file %s to exist", path)
return Continue("file %s does not exist", path)
}
if err != nil {
return Error(err)
}
return Success()
}
}
// Connection try to open a connection to the address on the
// named network. See net.Dial for a description of the network and
// address parameters.
func Connection(network, address string) Check {
return func(t LogT) Result {
_, err := net.Dial(network, address)
if err != nil {
t.Logf("waiting on socket %s://%s to be available...", network, address)
return Continue("socket %s://%s not available", network, address)
}
return Success()
}
}

140
libnetwork/vendor/gotest.tools/poll/poll.go vendored Normal file
View file

@ -0,0 +1,140 @@
/*Package poll provides tools for testing asynchronous code.
*/
package poll // import "gotest.tools/poll"
import (
"fmt"
"time"
)
// TestingT is the subset of testing.T used by WaitOn
type TestingT interface {
LogT
Fatalf(format string, args ...interface{})
}
// LogT is a logging interface that is passed to the WaitOn check function
type LogT interface {
Log(args ...interface{})
Logf(format string, args ...interface{})
}
type helperT interface {
Helper()
}
// Settings are used to configure the behaviour of WaitOn
type Settings struct {
// Timeout is the maximum time to wait for the condition. Defaults to 10s.
Timeout time.Duration
// Delay is the time to sleep between checking the condition. Defaults to
// 100ms.
Delay time.Duration
}
func defaultConfig() *Settings {
return &Settings{Timeout: 10 * time.Second, Delay: 100 * time.Millisecond}
}
// SettingOp is a function which accepts and modifies Settings
type SettingOp func(config *Settings)
// WithDelay sets the delay to wait between polls
func WithDelay(delay time.Duration) SettingOp {
return func(config *Settings) {
config.Delay = delay
}
}
// WithTimeout sets the timeout
func WithTimeout(timeout time.Duration) SettingOp {
return func(config *Settings) {
config.Timeout = timeout
}
}
// Result of a check performed by WaitOn
type Result interface {
// Error indicates that the check failed and polling should stop, and the
// the has failed
Error() error
// Done indicates that polling should stop, and the test should proceed
Done() bool
// Message provides the most recent state when polling has not completed
Message() string
}
type result struct {
done bool
message string
err error
}
func (r result) Done() bool {
return r.done
}
func (r result) Message() string {
return r.message
}
func (r result) Error() error {
return r.err
}
// Continue returns a Result that indicates to WaitOn that it should continue
// polling. The message text will be used as the failure message if the timeout
// is reached.
func Continue(message string, args ...interface{}) Result {
return result{message: fmt.Sprintf(message, args...)}
}
// Success returns a Result where Done() returns true, which indicates to WaitOn
// that it should stop polling and exit without an error.
func Success() Result {
return result{done: true}
}
// Error returns a Result that indicates to WaitOn that it should fail the test
// and stop polling.
func Error(err error) Result {
return result{err: err}
}
// WaitOn a condition or until a timeout. Poll by calling check and exit when
// check returns a done Result. To fail a test and exit polling with an error
// return a error result.
func WaitOn(t TestingT, check Check, pollOps ...SettingOp) {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
config := defaultConfig()
for _, pollOp := range pollOps {
pollOp(config)
}
var lastMessage string
after := time.After(config.Timeout)
chResult := make(chan Result)
for {
go func() {
chResult <- check(t)
}()
select {
case <-after:
if lastMessage == "" {
lastMessage = "first check never completed"
}
t.Fatalf("timeout hit after %s: %s", config.Timeout, lastMessage)
case result := <-chResult:
switch {
case result.Error() != nil:
t.Fatalf("polling check failed: %s", result.Error())
case result.Done():
return
}
time.Sleep(config.Delay)
lastMessage = result.Message()
}
}
}