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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| package toytlv | ||
|
|
||
| import ( | ||
| "io" | ||
| "log/slog" | ||
| "net" | ||
| "sync" | ||
| "sync/atomic" | ||
| "time" | ||
|
|
||
| "github.com/drpcorg/chotki/toyqueue" | ||
| ) | ||
|
|
||
| type ConnType = uint | ||
|
|
||
| const ( | ||
| TCP ConnType = iota + 1 | ||
| TLS | ||
| QUIC | ||
| ) | ||
|
|
||
| const ( | ||
| TYPICAL_MTU = 1500 | ||
| MAX_OUT_QUEUE_LEN = 1 << 20 // 16MB of pointers is a lot | ||
|
|
||
| MAX_RETRY_PERIOD = time.Minute | ||
| MIN_RETRY_PERIOD = time.Second / 2 | ||
| ) | ||
|
|
||
| type Jack func(conn net.Conn) toyqueue.FeedDrainCloser | ||
|
|
||
| type Peer struct { | ||
| conn atomic.Pointer[net.Conn] | ||
| inout toyqueue.FeedDrainCloser | ||
| reconnect func() (net.Conn, error) | ||
|
|
||
| mu sync.Mutex | ||
| co sync.Cond | ||
|
|
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| Protocol ConnType | ||
| KeepAlive bool | ||
| } | ||
|
|
||
| func (tcp *Peer) doRead() { | ||
| err := tcp.read() | ||
|
|
||
| if err != nil && err != ErrDisconnected { | ||
| _ = tcp.Close() | ||
|
|
||
| // TODO: error handling | ||
| slog.Error("couldn't read from conn", "err", err) | ||
| } | ||
| } | ||
|
|
||
| func (tcp *Peer) read() error { | ||
| var buf []byte | ||
| var err error | ||
|
|
||
| for { | ||
| conn := tcp.conn.Load() | ||
| if conn == nil { | ||
| break | ||
| } | ||
|
|
||
| if buf, err = appendRead(buf, *conn, TYPICAL_MTU); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| var recs toyqueue.Records | ||
| if recs, buf, err = Split(buf); err != nil { | ||
| return err | ||
| } else if len(recs) == 0 { | ||
| time.Sleep(time.Millisecond) | ||
| continue | ||
| } | ||
|
|
||
| if err = tcp.inout.Drain(recs); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (tcp *Peer) doWrite() { | ||
| var err error | ||
| var recs toyqueue.Records | ||
| for err == nil { | ||
| conn := tcp.conn.Load() | ||
| if conn == nil { | ||
| break | ||
| } | ||
|
|
||
| recs, err = tcp.inout.Feed() | ||
| b := net.Buffers(recs) | ||
| for len(b) > 0 && err == nil { | ||
| _, err = b.WriteTo(*conn) | ||
| } | ||
| } | ||
| if err != nil { | ||
| tcp.Close() // TODO err | ||
| } | ||
| } | ||
|
|
||
| func (tcp *Peer) Drain(recs toyqueue.Records) error { | ||
| return tcp.inout.Drain(recs) | ||
| } | ||
|
|
||
| func (tcp *Peer) Feed() (toyqueue.Records, error) { | ||
| return tcp.inout.Feed() | ||
| } | ||
|
|
||
| func (tcp *Peer) keepTalking() { | ||
| go tcp.doWrite() | ||
| go tcp.doRead() | ||
|
|
||
| talkBackoff, connBackoff := MIN_RETRY_PERIOD, MIN_RETRY_PERIOD | ||
|
|
||
| for tcp.reconnect == nil { | ||
| conntime := time.Now() | ||
|
|
||
| atLeast5min := conntime.Add(time.Minute * 5) | ||
| if atLeast5min.After(time.Now()) { | ||
| talkBackoff *= 2 // connected, tried to talk, failed => wait more | ||
| if talkBackoff > MAX_RETRY_PERIOD { | ||
| talkBackoff = MAX_RETRY_PERIOD | ||
| } | ||
| } | ||
|
|
||
| for { | ||
| if conn := tcp.conn.Load(); conn == nil { | ||
| break | ||
| } | ||
|
|
||
| time.Sleep(connBackoff + talkBackoff) | ||
| conn, err := tcp.reconnect() | ||
| if err != nil { | ||
| connBackoff = connBackoff * 2 | ||
| if connBackoff > MAX_RETRY_PERIOD/2 { | ||
| connBackoff = MAX_RETRY_PERIOD | ||
| } | ||
| } else { | ||
| tcp.conn.Store(&conn) | ||
| connBackoff = MIN_RETRY_PERIOD | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (tcp *Peer) Close() error { | ||
| tcp.mu.Lock() | ||
| defer tcp.mu.Unlock() | ||
|
|
||
| // TODO writer closes on complete | 1 sec expired | ||
| if conn := tcp.conn.Swap(nil); conn != nil { | ||
| if err := (*conn).Close(); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| tcp.co.Broadcast() | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func roundPage(l int) int { | ||
| if (l & 0xfff) != 0 { | ||
| l = (l & ^0xfff) + 0x1000 | ||
| } | ||
| return l | ||
| } | ||
|
|
||
| // appendRead reads data from io.Reader into the *spare space* of the provided buffer, | ||
| // i.e. those cap(buf)-len(buf) vacant bytes. If the spare space is smaller than | ||
| // lenHint, allocates (as reading less bytes might be unwise). | ||
| func appendRead(buf []byte, rdr io.Reader, lenHint int) ([]byte, error) { | ||
| avail := cap(buf) - len(buf) | ||
| if avail < lenHint { | ||
| want := roundPage(len(buf) + lenHint) | ||
| newbuf := make([]byte, want) | ||
| copy(newbuf[:], buf) | ||
| buf = newbuf[:len(buf)] | ||
| } | ||
| idle := buf[len(buf):cap(buf)] | ||
| n, err := rdr.Read(idle) | ||
| if err != nil { | ||
| return buf, err | ||
| } | ||
| if n == 0 { | ||
| return buf, io.EOF | ||
| } | ||
| buf = buf[:len(buf)+n] | ||
| return buf, nil | ||
| } |
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