DragonTCP
This commit is contained in:
@@ -0,0 +1,748 @@
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package main
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import (
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"context"
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"crypto/rand"
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"encoding/hex"
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"fmt"
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"io"
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"net"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"dragontcp/internal/protocol"
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)
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type chunkClientOptions struct {
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startSize int
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minSize int
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maxSize int
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adaptive bool
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adaptSuccesses int
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adaptLog bool
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pollers int
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reconnectEvery int
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pollDelay time.Duration
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txnTimeout time.Duration
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tcpBuffer int
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}
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type adaptiveSizer struct {
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mu sync.Mutex
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name string
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current int
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min int
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max int
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adaptive bool
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adaptSuccesses int
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successes int
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good int
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bad int
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logChanges bool
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}
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func newAdaptiveSizer(name string, opts chunkClientOptions) *adaptiveSizer {
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start := opts.startSize
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if start < opts.minSize {
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start = opts.minSize
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}
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if start > opts.maxSize {
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start = opts.maxSize
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}
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return &adaptiveSizer{
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name: name,
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current: start,
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min: opts.minSize,
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max: opts.maxSize,
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adaptive: opts.adaptive,
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adaptSuccesses: opts.adaptSuccesses,
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logChanges: opts.adaptLog,
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}
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}
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func (s *adaptiveSizer) Current() int {
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s.mu.Lock()
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n := s.current
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s.mu.Unlock()
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return n
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}
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func (s *adaptiveSizer) Success(attempted int) {
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s.mu.Lock()
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defer s.mu.Unlock()
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if !s.adaptive || s.current >= s.max {
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return
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}
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// Ignore stale successes from records that were already in flight when
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// another worker changed the shared size.
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if attempted != s.current {
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return
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}
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if attempted > s.good {
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s.good = attempted
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}
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s.successes++
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growAfter := s.adaptSuccesses
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// When we have converged close to a known failure boundary, stay stable
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// longer before probing again. This also lets us discover later network
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// improvements without constantly oscillating around the boundary.
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if s.bad > 0 && s.bad-s.good <= 32 {
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growAfter *= 8
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}
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if s.successes < growAfter {
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return
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}
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s.successes = 0
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old := s.current
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var next int
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if s.bad > old+1 {
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// Binary-search the gap between known-good and known-bad sizes.
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next = old + (s.bad-old)/2
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} else {
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// Either there is no known ceiling, or we have stayed stable long enough
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// at it to probe the network again in case conditions improved.
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if s.bad > 0 {
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s.bad = 0
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}
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step := old / 4
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if step < 32 {
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step = 32
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}
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next = old + step
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}
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if next > s.max {
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next = s.max
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}
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if next <= old {
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return
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}
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s.current = next
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if s.logChanges {
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fmt.Printf("adaptive %s chunk: %d -> %d after stable success\n", s.name, old, next)
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}
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}
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func (s *adaptiveSizer) Failure(attempted int) (old, next int) {
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s.mu.Lock()
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defer s.mu.Unlock()
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old = s.current
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if !s.adaptive {
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return old, old
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}
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// Multiple pollers can fail on the same oversized value at once. Only the
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// first failure for the current value is allowed to reduce it.
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if attempted != s.current {
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return old, old
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}
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s.successes = 0
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if s.bad == 0 || attempted < s.bad {
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s.bad = attempted
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}
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if s.good > 0 && s.good < attempted {
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// Return directly to the last size that was proven to work.
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next = s.good
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} else {
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// A previously-good value just failed, so conditions worsened. Forget
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// the old lower bound and use multiplicative decrease.
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s.good = 0
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next = attempted / 2
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}
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if next < s.min {
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next = s.min
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}
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if next >= attempted && attempted > s.min {
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next = attempted - 1
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}
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if next < s.min {
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next = s.min
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}
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s.current = next
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if s.logChanges && next != old {
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fmt.Printf("adaptive %s chunk: %d -> %d after transport failure\n", s.name, old, next)
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}
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return old, next
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}
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type txnLane struct {
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mu sync.Mutex
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serverAddr string
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tcpBuffer int
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reconnectEvery int
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timeout time.Duration
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conn net.Conn
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count int
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closed bool
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}
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func newTxnLane(serverAddr string, tcpBuffer, reconnectEvery int, timeout time.Duration) *txnLane {
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return &txnLane{
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serverAddr: serverAddr,
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tcpBuffer: tcpBuffer,
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reconnectEvery: reconnectEvery,
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timeout: timeout,
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}
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}
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func (l *txnLane) closeLocked() {
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if l.conn != nil {
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_ = l.conn.Close()
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l.conn = nil
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}
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l.count = 0
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}
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func (l *txnLane) Close() {
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l.mu.Lock()
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l.closed = true
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l.closeLocked()
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l.mu.Unlock()
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}
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func (l *txnLane) ensureConn() error {
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if l.closed {
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return net.ErrClosed
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}
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if l.conn != nil && (l.reconnectEvery <= 0 || l.count < l.reconnectEvery) {
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return nil
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}
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l.closeLocked()
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d := net.Dialer{Timeout: 10 * time.Second, KeepAlive: 30 * time.Second}
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conn, err := d.Dial("tcp", l.serverAddr)
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if err != nil {
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return err
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}
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protocol.TuneTCP(conn)
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protocol.TuneTCPBuffer(conn, l.tcpBuffer)
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l.conn = conn
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return nil
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}
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// Do performs exactly one framed transaction. Higher layers decide whether a
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// failed data record should be retried at a smaller adaptive size.
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func (l *txnLane) Do(payload []byte) ([]byte, error) {
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l.mu.Lock()
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defer l.mu.Unlock()
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if err := l.ensureConn(); err != nil {
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return nil, err
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}
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timeout := l.timeout
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if timeout <= 0 {
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timeout = 5 * time.Second
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}
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_ = l.conn.SetDeadline(time.Now().Add(timeout))
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requestID := requestCounter.Add(1)
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if err := protocol.WriteRequestFrame(l.conn, requestID, payload); err != nil {
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l.closeLocked()
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return nil, err
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}
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responseID, response, err := protocol.ReadResponseFrame(l.conn)
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if err != nil {
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l.closeLocked()
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return nil, err
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}
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if responseID != requestID {
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l.closeLocked()
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return nil, fmt.Errorf("request ID mismatch")
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}
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l.count++
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_ = l.conn.SetDeadline(time.Time{})
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return response, nil
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}
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func doControl(lane *txnLane, payload []byte) ([]byte, error) {
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var lastErr error
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for attempt := 0; attempt < 5; attempt++ {
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resp, err := lane.Do(payload)
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if err == nil {
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return resp, nil
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}
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lastErr = err
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time.Sleep(time.Duration(attempt+1) * 40 * time.Millisecond)
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}
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return nil, lastErr
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}
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type chunkResult struct {
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seq uint64
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data []byte
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final uint64
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eof bool
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err error
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}
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type chunkConn struct {
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serverAddr string
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token string
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sid string
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opts chunkClientOptions
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pushLane *txnLane
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pullLanes []*txnLane
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upSizer *adaptiveSizer
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downSizer *adaptiveSizer
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serverMax int
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ctx context.Context
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cancel context.CancelFunc
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once sync.Once
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writeMu sync.Mutex
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upSeq uint64
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claim atomic.Uint64
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ack atomic.Int64
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results chan chunkResult
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workers sync.WaitGroup
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readMu sync.Mutex
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pending map[uint64][]byte
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nextRead uint64
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current []byte
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currentSeq uint64
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finalKnown bool
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finalSeq uint64
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terminalErr error
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}
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func randomSessionID() (string, error) {
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var b [16]byte
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if _, err := rand.Read(b[:]); err != nil {
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return "", err
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}
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return hex.EncodeToString(b[:]), nil
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}
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func openChunkTunnel(serverAddr, token, targetHost string, targetPort int, opts chunkClientOptions) (net.Conn, error) {
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if opts.minSize < 32 {
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opts.minSize = 32
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}
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if opts.maxSize < opts.minSize {
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opts.maxSize = opts.minSize
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}
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if opts.maxSize > protocol.MaxChunkPayload {
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opts.maxSize = protocol.MaxChunkPayload
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}
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if opts.startSize < opts.minSize {
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opts.startSize = opts.minSize
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}
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if opts.startSize > opts.maxSize {
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opts.startSize = opts.maxSize
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}
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if opts.adaptSuccesses < 1 {
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opts.adaptSuccesses = 64
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}
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if opts.pollers < 1 {
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opts.pollers = 1
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}
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if opts.pollers > 128 {
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opts.pollers = 128
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}
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if opts.txnTimeout <= 0 {
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opts.txnTimeout = 5 * time.Second
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}
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sid, err := randomSessionID()
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if err != nil {
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return nil, err
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}
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ctx, cancel := context.WithCancel(context.Background())
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c := &chunkConn{
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serverAddr: serverAddr,
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token: token,
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sid: sid,
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opts: opts,
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ctx: ctx,
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cancel: cancel,
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results: make(chan chunkResult, opts.pollers*4),
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pending: make(map[uint64][]byte, opts.pollers*2),
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}
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c.ack.Store(-1)
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c.upSizer = newAdaptiveSizer("upload", opts)
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c.downSizer = newAdaptiveSizer("download", opts)
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c.pushLane = newTxnLane(serverAddr, opts.tcpBuffer, opts.reconnectEvery, opts.txnTimeout)
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openPayload := []byte(fmt.Sprintf(
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"COPEN %s %s %s %d",
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token, sid, targetHost, targetPort,
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))
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resp, err := doControl(c.pushLane, openPayload)
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if err != nil {
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c.pushLane.Close()
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cancel()
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return nil, err
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}
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fields := strings.Fields(string(resp))
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if len(fields) != 2 || fields[0] != "OPENED" {
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c.pushLane.Close()
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cancel()
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return nil, fmt.Errorf("%s", resp)
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}
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serverMax, err := strconv.Atoi(fields[1])
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if err != nil || serverMax < 32 {
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c.pushLane.Close()
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cancel()
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return nil, fmt.Errorf("bad OPENED response: %q", resp)
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}
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c.serverMax = serverMax
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if serverMax < c.opts.maxSize {
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c.opts.maxSize = serverMax
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c.upSizer.max = serverMax
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c.downSizer.max = serverMax
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if c.upSizer.current > serverMax {
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c.upSizer.current = serverMax
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}
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if c.downSizer.current > serverMax {
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c.downSizer.current = serverMax
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}
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}
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c.pullLanes = make([]*txnLane, opts.pollers)
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for i := 0; i < opts.pollers; i++ {
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lane := newTxnLane(serverAddr, opts.tcpBuffer, opts.reconnectEvery, opts.txnTimeout)
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c.pullLanes[i] = lane
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c.workers.Add(1)
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go c.pullWorker(lane)
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}
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return c, nil
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}
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func parseDataResponse(resp []byte) (seq uint64, offset int, total int, data []byte, err error) {
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if len(resp) < 6 || string(resp[:5]) != "DATA " {
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return 0, 0, 0, nil, fmt.Errorf("not DATA")
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}
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rest := resp[5:]
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fields := make([][]byte, 0, 3)
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start := 0
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for i := 0; i < len(rest) && len(fields) < 3; i++ {
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if rest[i] == ' ' {
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fields = append(fields, rest[start:i])
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start = i + 1
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}
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}
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if len(fields) != 3 {
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return 0, 0, 0, nil, fmt.Errorf("bad DATA response")
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}
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seq, err = strconv.ParseUint(string(fields[0]), 10, 64)
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if err != nil {
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return 0, 0, 0, nil, err
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}
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offset, err = strconv.Atoi(string(fields[1]))
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if err != nil || offset < 0 {
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return 0, 0, 0, nil, fmt.Errorf("bad DATA offset")
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}
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total, err = strconv.Atoi(string(fields[2]))
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if err != nil || total < 0 {
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return 0, 0, 0, nil, fmt.Errorf("bad DATA total")
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}
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// start now points immediately after the third separator.
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return seq, offset, total, rest[start:], nil
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}
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func (c *chunkConn) pullWorker(lane *txnLane) {
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defer c.workers.Done()
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|
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for {
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select {
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case <-c.ctx.Done():
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return
|
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default:
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}
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seq := c.claim.Add(1) - 1
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offset := 0
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var assembled []byte
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consecutiveMinFailures := 0
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for {
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select {
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case <-c.ctx.Done():
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return
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default:
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}
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limit := c.downSizer.Current()
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ack := c.ack.Load()
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payload := []byte(fmt.Sprintf(
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"CPULL %s %s %d %d %d %d",
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c.token, c.sid, ack, seq, offset, limit,
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))
|
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resp, err := lane.Do(payload)
|
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if err != nil {
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old, next := c.downSizer.Failure(limit)
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if next == old && next == c.opts.minSize {
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consecutiveMinFailures++
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} else {
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consecutiveMinFailures = 0
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}
|
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if consecutiveMinFailures >= 8 {
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select {
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case c.results <- chunkResult{seq: seq, err: fmt.Errorf("download failed at minimum chunk %d: %w", next, err)}:
|
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case <-c.ctx.Done():
|
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}
|
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return
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}
|
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time.Sleep(30 * time.Millisecond)
|
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continue
|
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}
|
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|
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if string(resp) == "WAIT" {
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if c.opts.pollDelay > 0 {
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select {
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case <-time.After(c.opts.pollDelay):
|
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case <-c.ctx.Done():
|
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return
|
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}
|
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}
|
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continue
|
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}
|
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|
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if strings.HasPrefix(string(resp), "ERR ") {
|
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select {
|
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case c.results <- chunkResult{seq: seq, err: fmt.Errorf("%s", resp)}:
|
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case <-c.ctx.Done():
|
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}
|
||||
return
|
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}
|
||||
|
||||
if strings.HasPrefix(string(resp), "EOF ") {
|
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n, err := strconv.ParseUint(strings.TrimSpace(string(resp[4:])), 10, 64)
|
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if err != nil {
|
||||
select {
|
||||
case c.results <- chunkResult{seq: seq, err: err}:
|
||||
case <-c.ctx.Done():
|
||||
}
|
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return
|
||||
}
|
||||
select {
|
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case c.results <- chunkResult{seq: seq, eof: true, final: n}:
|
||||
case <-c.ctx.Done():
|
||||
}
|
||||
break
|
||||
}
|
||||
|
||||
gotSeq, gotOffset, total, fragment, err := parseDataResponse(resp)
|
||||
if err != nil {
|
||||
select {
|
||||
case c.results <- chunkResult{seq: seq, err: err}:
|
||||
case <-c.ctx.Done():
|
||||
}
|
||||
return
|
||||
}
|
||||
if gotSeq != seq || gotOffset != offset {
|
||||
select {
|
||||
case c.results <- chunkResult{seq: seq, err: fmt.Errorf("DATA position mismatch")}:
|
||||
case <-c.ctx.Done():
|
||||
}
|
||||
return
|
||||
}
|
||||
if total > c.serverMax || total < offset+len(fragment) || len(fragment) == 0 {
|
||||
select {
|
||||
case c.results <- chunkResult{seq: seq, err: fmt.Errorf("invalid DATA fragment size")}:
|
||||
case <-c.ctx.Done():
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
if assembled == nil {
|
||||
assembled = make([]byte, 0, total)
|
||||
}
|
||||
assembled = append(assembled, fragment...)
|
||||
offset += len(fragment)
|
||||
consecutiveMinFailures = 0
|
||||
c.downSizer.Success(limit)
|
||||
|
||||
if offset == total {
|
||||
select {
|
||||
case c.results <- chunkResult{seq: seq, data: assembled}:
|
||||
case <-c.ctx.Done():
|
||||
}
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (c *chunkConn) Read(p []byte) (int, error) {
|
||||
c.readMu.Lock()
|
||||
defer c.readMu.Unlock()
|
||||
|
||||
for {
|
||||
if len(c.current) > 0 {
|
||||
n := copy(p, c.current)
|
||||
c.current = c.current[n:]
|
||||
if len(c.current) == 0 {
|
||||
c.nextRead++
|
||||
c.ack.Store(int64(c.currentSeq))
|
||||
}
|
||||
return n, nil
|
||||
}
|
||||
|
||||
if c.terminalErr != nil {
|
||||
return 0, c.terminalErr
|
||||
}
|
||||
|
||||
if c.finalKnown && c.nextRead >= c.finalSeq {
|
||||
return 0, io.EOF
|
||||
}
|
||||
|
||||
if data, ok := c.pending[c.nextRead]; ok {
|
||||
delete(c.pending, c.nextRead)
|
||||
c.current = data
|
||||
c.currentSeq = c.nextRead
|
||||
continue
|
||||
}
|
||||
|
||||
result, ok := <-c.results
|
||||
if !ok {
|
||||
return 0, io.EOF
|
||||
}
|
||||
if result.err != nil {
|
||||
c.terminalErr = result.err
|
||||
return 0, result.err
|
||||
}
|
||||
if result.eof {
|
||||
if !c.finalKnown || result.final < c.finalSeq {
|
||||
c.finalKnown = true
|
||||
c.finalSeq = result.final
|
||||
}
|
||||
continue
|
||||
}
|
||||
if result.seq < c.nextRead {
|
||||
continue
|
||||
}
|
||||
c.pending[result.seq] = result.data
|
||||
}
|
||||
}
|
||||
|
||||
func parseAck(resp []byte, expectedSeq uint64) (int, error) {
|
||||
fields := strings.Fields(string(resp))
|
||||
if len(fields) != 3 || fields[0] != "ACK" {
|
||||
return 0, fmt.Errorf("bad CPUSH response: %q", resp)
|
||||
}
|
||||
seq, err := strconv.ParseUint(fields[1], 10, 64)
|
||||
if err != nil || seq != expectedSeq {
|
||||
return 0, fmt.Errorf("bad CPUSH sequence: %q", resp)
|
||||
}
|
||||
n, err := strconv.Atoi(fields[2])
|
||||
if err != nil || n <= 0 {
|
||||
return 0, fmt.Errorf("bad CPUSH length: %q", resp)
|
||||
}
|
||||
return n, nil
|
||||
}
|
||||
|
||||
func (c *chunkConn) Write(p []byte) (int, error) {
|
||||
c.writeMu.Lock()
|
||||
defer c.writeMu.Unlock()
|
||||
|
||||
total := 0
|
||||
consecutiveMinFailures := 0
|
||||
|
||||
for len(p) > 0 {
|
||||
size := c.upSizer.Current()
|
||||
n := size
|
||||
if len(p) < n {
|
||||
n = len(p)
|
||||
}
|
||||
|
||||
seq := c.upSeq
|
||||
prefix := []byte(fmt.Sprintf("CPUSH %s %s %d ", c.token, c.sid, seq))
|
||||
payload := make([]byte, len(prefix)+n)
|
||||
copy(payload, prefix)
|
||||
copy(payload[len(prefix):], p[:n])
|
||||
|
||||
resp, err := c.pushLane.Do(payload)
|
||||
if err != nil {
|
||||
old, next := c.upSizer.Failure(size)
|
||||
if next == old && next == c.opts.minSize {
|
||||
consecutiveMinFailures++
|
||||
} else {
|
||||
consecutiveMinFailures = 0
|
||||
}
|
||||
if consecutiveMinFailures >= 8 {
|
||||
return total, fmt.Errorf("upload failed at minimum chunk %d: %w", next, err)
|
||||
}
|
||||
time.Sleep(30 * time.Millisecond)
|
||||
continue
|
||||
}
|
||||
|
||||
if strings.HasPrefix(string(resp), "ERR ") {
|
||||
return total, fmt.Errorf("%s", resp)
|
||||
}
|
||||
|
||||
accepted, err := parseAck(resp, seq)
|
||||
if err != nil {
|
||||
return total, err
|
||||
}
|
||||
if accepted > len(p) {
|
||||
return total, fmt.Errorf("server ACK length %d exceeds pending write %d", accepted, len(p))
|
||||
}
|
||||
|
||||
c.upSeq++
|
||||
total += accepted
|
||||
p = p[accepted:]
|
||||
consecutiveMinFailures = 0
|
||||
c.upSizer.Success(size)
|
||||
}
|
||||
|
||||
return total, nil
|
||||
}
|
||||
|
||||
func (c *chunkConn) Close() error {
|
||||
c.once.Do(func() {
|
||||
c.cancel()
|
||||
|
||||
lane := newTxnLane(c.serverAddr, c.opts.tcpBuffer, 1, c.opts.txnTimeout)
|
||||
_, _ = doControl(lane, []byte(fmt.Sprintf("CCLOSE %s %s", c.token, c.sid)))
|
||||
lane.Close()
|
||||
|
||||
if c.pushLane != nil {
|
||||
c.pushLane.Close()
|
||||
}
|
||||
for _, lane := range c.pullLanes {
|
||||
lane.Close()
|
||||
}
|
||||
c.workers.Wait()
|
||||
close(c.results)
|
||||
})
|
||||
return nil
|
||||
}
|
||||
|
||||
func (c *chunkConn) LocalAddr() net.Addr { return dummyAddr("dragontcp-chunk-local") }
|
||||
func (c *chunkConn) RemoteAddr() net.Addr { return dummyAddr("dragontcp-chunk-remote") }
|
||||
func (c *chunkConn) SetDeadline(time.Time) error { return nil }
|
||||
func (c *chunkConn) SetReadDeadline(time.Time) error { return nil }
|
||||
func (c *chunkConn) SetWriteDeadline(time.Time) error { return nil }
|
||||
|
||||
type dummyAddr string
|
||||
|
||||
func (d dummyAddr) Network() string { return "dragontcp-chunk" }
|
||||
func (d dummyAddr) String() string { return string(d) }
|
||||
Reference in New Issue
Block a user