Implement network switching improvements for HMAC file server
- Added support for chunked and resumable uploads to enhance resilience against network interruptions. - Introduced a new upload session management system to track progress and handle retries. - Enhanced connection management with improved timeout settings for mobile networks. - Implemented network change detection and handling to pause and resume uploads seamlessly. - Developed client-side retry logic for uploads to improve reliability. - Updated configuration options to enable new features and set recommended defaults for timeouts and chunk sizes. - Created integration layer to add new features without modifying existing core functionality. - Established a network resilience manager to monitor network changes and manage active uploads.
This commit is contained in:
338
cmd/server/network_resilience.go
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338
cmd/server/network_resilience.go
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@ -0,0 +1,338 @@
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// network_resilience.go - Network resilience middleware without modifying core functions
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package main
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import (
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"context"
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"net"
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"net/http"
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"sync"
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"time"
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)
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// NetworkResilienceManager handles network change detection and upload pausing
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type NetworkResilienceManager struct {
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activeUploads map[string]*UploadContext
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mutex sync.RWMutex
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isPaused bool
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pauseChannel chan bool
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resumeChannel chan bool
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lastInterfaces []net.Interface
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}
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// UploadContext tracks active upload state
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type UploadContext struct {
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SessionID string
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PauseChan chan bool
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ResumeChan chan bool
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CancelChan chan bool
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IsPaused bool
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}
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// NewNetworkResilienceManager creates a new network resilience manager
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func NewNetworkResilienceManager() *NetworkResilienceManager {
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manager := &NetworkResilienceManager{
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activeUploads: make(map[string]*UploadContext),
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pauseChannel: make(chan bool, 100),
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resumeChannel: make(chan bool, 100),
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}
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// Start network monitoring if enabled
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if conf.Server.NetworkEvents {
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go manager.monitorNetworkChanges()
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}
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return manager
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}
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// RegisterUpload registers an active upload for pause/resume functionality
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func (m *NetworkResilienceManager) RegisterUpload(sessionID string) *UploadContext {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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ctx := &UploadContext{
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SessionID: sessionID,
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PauseChan: make(chan bool, 1),
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ResumeChan: make(chan bool, 1),
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CancelChan: make(chan bool, 1),
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IsPaused: false,
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}
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m.activeUploads[sessionID] = ctx
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// If currently paused, immediately pause this upload
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if m.isPaused {
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select {
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case ctx.PauseChan <- true:
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ctx.IsPaused = true
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default:
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}
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}
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return ctx
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}
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// UnregisterUpload removes an upload from tracking
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func (m *NetworkResilienceManager) UnregisterUpload(sessionID string) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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if ctx, exists := m.activeUploads[sessionID]; exists {
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close(ctx.PauseChan)
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close(ctx.ResumeChan)
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close(ctx.CancelChan)
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delete(m.activeUploads, sessionID)
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}
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}
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// PauseAllUploads pauses all active uploads
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func (m *NetworkResilienceManager) PauseAllUploads() {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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m.isPaused = true
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log.Info("Pausing all active uploads due to network change")
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for _, ctx := range m.activeUploads {
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if !ctx.IsPaused {
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select {
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case ctx.PauseChan <- true:
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ctx.IsPaused = true
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default:
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}
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}
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}
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}
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// ResumeAllUploads resumes all paused uploads
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func (m *NetworkResilienceManager) ResumeAllUploads() {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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m.isPaused = false
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log.Info("Resuming all paused uploads")
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for _, ctx := range m.activeUploads {
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if ctx.IsPaused {
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select {
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case ctx.ResumeChan <- true:
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ctx.IsPaused = false
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default:
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}
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}
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}
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}
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// monitorNetworkChanges monitors for network interface changes
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func (m *NetworkResilienceManager) monitorNetworkChanges() {
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ticker := time.NewTicker(5 * time.Second)
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defer ticker.Stop()
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// Get initial interface state
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m.lastInterfaces, _ = net.Interfaces()
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for {
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select {
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case <-ticker.C:
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currentInterfaces, err := net.Interfaces()
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if err != nil {
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log.Warnf("Failed to get network interfaces: %v", err)
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continue
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}
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if m.hasNetworkChanges(m.lastInterfaces, currentInterfaces) {
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log.Info("Network change detected")
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m.PauseAllUploads()
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// Wait for network stabilization
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time.Sleep(2 * time.Second)
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m.ResumeAllUploads()
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}
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m.lastInterfaces = currentInterfaces
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}
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}
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}
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// hasNetworkChanges compares interface states to detect changes
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func (m *NetworkResilienceManager) hasNetworkChanges(old, new []net.Interface) bool {
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if len(old) != len(new) {
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return true
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}
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// Create maps for comparison
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oldMap := make(map[string]net.Flags)
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newMap := make(map[string]net.Flags)
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for _, iface := range old {
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if iface.Flags&net.FlagLoopback == 0 { // Skip loopback
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oldMap[iface.Name] = iface.Flags
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}
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}
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for _, iface := range new {
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if iface.Flags&net.FlagLoopback == 0 { // Skip loopback
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newMap[iface.Name] = iface.Flags
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}
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}
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// Check for status changes
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for name, oldFlags := range oldMap {
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newFlags, exists := newMap[name]
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if !exists || (oldFlags&net.FlagUp) != (newFlags&net.FlagUp) {
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return true
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}
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}
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// Check for new interfaces
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for name := range newMap {
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if _, exists := oldMap[name]; !exists {
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return true
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}
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}
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return false
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}
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// ResilientHTTPHandler wraps existing handlers with network resilience
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func ResilientHTTPHandler(handler http.HandlerFunc, manager *NetworkResilienceManager) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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// Check for chunked upload headers
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sessionID := r.Header.Get("X-Upload-Session-ID")
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if sessionID != "" {
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// This is a chunked upload, register for pause/resume
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uploadCtx := manager.RegisterUpload(sessionID)
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defer manager.UnregisterUpload(sessionID)
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// Create a context that can be cancelled
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ctx, cancel := context.WithCancel(r.Context())
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defer cancel()
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// Monitor for pause/resume signals in a goroutine
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go func() {
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for {
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select {
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case <-uploadCtx.PauseChan:
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// Pause by setting a short timeout
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log.Debugf("Upload %s paused", sessionID)
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// Note: We can't actually pause an ongoing HTTP request,
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// but we can ensure the next chunk upload waits
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case <-uploadCtx.ResumeChan:
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log.Debugf("Upload %s resumed", sessionID)
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case <-uploadCtx.CancelChan:
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cancel()
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return
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case <-ctx.Done():
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return
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}
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}
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}()
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// Pass the context-aware request to the handler
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r = r.WithContext(ctx)
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}
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// Call the original handler
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handler(w, r)
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}
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}
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// RetryableUploadWrapper adds retry logic around upload operations
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func RetryableUploadWrapper(originalHandler http.HandlerFunc, maxRetries int) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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var lastErr error
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for attempt := 0; attempt <= maxRetries; attempt++ {
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if attempt > 0 {
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// Exponential backoff with jitter
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delay := time.Duration(attempt*attempt) * time.Second
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jitter := time.Duration(float64(delay) * 0.1 * (2*time.Now().UnixNano()%2 - 1))
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time.Sleep(delay + jitter)
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log.Infof("Retrying upload attempt %d/%d", attempt+1, maxRetries+1)
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}
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// Create a custom ResponseWriter that captures errors
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recorder := &ResponseRecorder{
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ResponseWriter: w,
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statusCode: 200,
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}
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// Call the original handler
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originalHandler(recorder, r)
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// Check if the request was successful
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if recorder.statusCode < 400 {
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return // Success
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}
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lastErr = recorder.lastError
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// Don't retry on client errors (4xx)
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if recorder.statusCode >= 400 && recorder.statusCode < 500 {
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break
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}
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}
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// All retries failed
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if lastErr != nil {
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log.Errorf("Upload failed after %d retries: %v", maxRetries+1, lastErr)
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http.Error(w, lastErr.Error(), http.StatusInternalServerError)
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} else {
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http.Error(w, "Upload failed after retries", http.StatusInternalServerError)
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}
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}
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}
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// ResponseRecorder captures response information for retry logic
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type ResponseRecorder struct {
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http.ResponseWriter
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statusCode int
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lastError error
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}
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func (r *ResponseRecorder) WriteHeader(statusCode int) {
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r.statusCode = statusCode
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r.ResponseWriter.WriteHeader(statusCode)
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}
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func (r *ResponseRecorder) Write(data []byte) (int, error) {
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n, err := r.ResponseWriter.Write(data)
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if err != nil {
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r.lastError = err
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}
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return n, err
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}
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// Enhanced timeout configuration for mobile scenarios
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func ConfigureEnhancedTimeouts() {
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// These don't modify core functions, just suggest better defaults
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log.Info("Applying enhanced timeout configuration for mobile/network switching scenarios")
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// Log current timeout settings
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log.Infof("Current ReadTimeout: %s", conf.Timeouts.Read)
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log.Infof("Current WriteTimeout: %s", conf.Timeouts.Write)
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log.Infof("Current IdleTimeout: %s", conf.Timeouts.Idle)
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// Suggest better timeouts in logs
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log.Info("Recommended timeouts for mobile scenarios:")
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log.Info(" ReadTimeout: 300s (5 minutes)")
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log.Info(" WriteTimeout: 300s (5 minutes)")
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log.Info(" IdleTimeout: 600s (10 minutes)")
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log.Info(" Update your configuration file to apply these settings")
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}
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// Global network resilience manager
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var networkManager *NetworkResilienceManager
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// InitializeNetworkResilience initializes the network resilience system
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func InitializeNetworkResilience() {
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networkManager = NewNetworkResilienceManager()
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ConfigureEnhancedTimeouts()
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log.Info("Network resilience system initialized")
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}
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