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account/usbwallet: abort usb enumeration after failures

This commit is contained in:
Martin Holst Swende 2019-06-05 10:57:10 +02:00 committed by Péter Szilágyi
parent 645756cda5
commit 2fae1bde42
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GPG Key ID: E9AE538CEDF8293D
1 changed files with 11 additions and 1 deletions
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12
accounts/usbwallet/hub.go
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@ -20,6 +20,7 @@ import (
"errors"
"runtime"
"sync"
"sync/atomic"
"time"
"github.com/ethereum/go-ethereum/accounts"
@ -64,6 +65,7 @@ type Hub struct {
// TODO(karalabe): remove if hotplug lands on Windows
commsPend int // Number of operations blocking enumeration
commsLock sync.Mutex // Lock protecting the pending counter and enumeration
enumFails uint32 // Number of times enumeration has failed
}
// NewLedgerHub creates a new hardware wallet manager for Ledger devices.
@ -138,6 +140,10 @@ func (hub *Hub) refreshWallets() {
if elapsed < refreshThrottling {
return
}
// If USB enumeration is continually failing, don't keep trying indefinitely
if atomic.LoadUint32(&hub.enumFails) > 2 {
return
}
// Retrieve the current list of USB wallet devices
var devices []usb.DeviceInfo
@ -156,13 +162,17 @@ func (hub *Hub) refreshWallets() {
}
infos, err := usb.Enumerate(hub.vendorID, 0)
if err != nil {
failcount := atomic.AddUint32(&hub.enumFails, 1)
if runtime.GOOS == "linux" {
// See rationale before the enumeration why this is needed and only on Linux.
hub.commsLock.Unlock()
}
log.Error("error enumerating USB enumeration: ", "code", err)
log.Error("Failed to enumerate USB devices", "hub", hub.scheme,
"vendor", hub.vendorID, "failcount", failcount, "err", err)
return
}
atomic.StoreUint32(&hub.enumFails, 0)
for _, info := range infos {
for _, id := range hub.productIDs {
// Windows and Macos use UsageID matching, Linux uses Interface matching