mirror of
https://github.com/status-im/status-go.git
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eeca435064
Update vendor Integrate rendezvous into status node Add a test with failover using rendezvous Use multiple servers in client Use discovery V5 by default and test that node can be started with rendezvous discovet Fix linter Update rendezvous client to one with instrumented stream Address feedback Fix test with updated topic limits Apply several suggestions Change log to debug for request errors because we continue execution Remove web3js after rebase Update rendezvous package
125 lines
3.2 KiB
Go
125 lines
3.2 KiB
Go
// Package temperrcatcher provides a TempErrCatcher object,
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// which implements simple error-retrying functionality.
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package temperrcatcher
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import (
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"time"
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)
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// InitialDelay governs how long to wait the first time.
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// This is defaulted to time.Millisecond, which makes sense
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// for network listener failures. You may want a much smaller
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// delay. You can configure this package wide, or in each
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// TempErrCatcher
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var InitialDelay = time.Millisecond
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// Temporary is an interface errors can implement to
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// ensure they are correctly classified by the default
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// TempErrCatcher classifier
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type Temporary interface {
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Temporary() bool
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}
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// ErrIsTemporary returns whether an error is Temporary(),
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// iff it implements the Temporary interface.
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func ErrIsTemporary(e error) bool {
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te, ok := e.(Temporary)
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return ok && te.Temporary()
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}
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// TempErrCatcher catches temporary errors for you. It then sleeps
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// for a bit before returning (you should then try again). This may
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// seem odd, but it's exactly what net/http does:
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// http://golang.org/src/net/http/server.go?s=51504:51550#L1728
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//
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// You can set a few options in TempErrCatcher. They all have defaults
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// so a zero TempErrCatcher is ready to be used:
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//
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// var c tec.TempErrCatcher
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// c.IsTemporary(tempErr)
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//
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type TempErrCatcher struct {
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IsTemp func(error) bool // the classifier to use. default: ErrIsTemporary
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Wait func(time.Duration) // the wait func to call. default: time.Sleep
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Max time.Duration // the maximum time to wait. default: time.Second
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Start time.Duration // the delay to start with. default: InitialDelay
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delay time.Duration
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last time.Time
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}
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func (tec *TempErrCatcher) init() {
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if tec.Max == 0 {
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tec.Max = time.Second
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}
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if tec.IsTemp == nil {
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tec.IsTemp = ErrIsTemporary
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}
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if tec.Wait == nil {
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tec.Wait = time.Sleep
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}
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if tec.Start == 0 {
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tec.Start = InitialDelay
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}
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}
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// IsTemporary checks whether an error is temporary. It will call
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// tec.Wait before returning, with a delay. The delay is also
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// doubled, so we do not constantly spin. This is the strategy
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// net.Listener uses.
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//
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// Note: you will want to call Reset() if you get a success,
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// so that the stored delay is brough back to 0.
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func (tec *TempErrCatcher) IsTemporary(e error) bool {
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tec.init()
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if tec.IsTemp(e) {
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now := time.Now()
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if now.Sub(tec.last) > (tec.delay * 5) {
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// this is a "new streak" of temp failures. reset.
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tec.Reset()
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}
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if tec.delay == 0 { // init case.
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tec.delay = tec.Start
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} else {
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tec.delay *= 2
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}
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if tec.delay > tec.Max {
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tec.delay = tec.Max
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}
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tec.Wait(tec.delay)
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tec.last = now
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return true
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}
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tec.Reset() // different failure. call reset
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return false
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}
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// Reset sets the internal delay counter to 0
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func (tec *TempErrCatcher) Reset() {
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tec.delay = 0
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}
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// ErrTemporary wraps any error and implements Temporary function.
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//
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// err := errors.New("beep boop")
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// var c tec.TempErrCatcher
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// c.IsTemporary(err) // false
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// c.IsTemporary(tec.ErrTemp{err}) // true
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//
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type ErrTemporary struct {
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Err error
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}
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func (e ErrTemporary) Temporary() bool {
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return true
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}
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func (e ErrTemporary) Error() string {
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return e.Err.Error()
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}
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func (e ErrTemporary) String() string {
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return e.Error()
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}
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