Per-packet source tracking in transport, via/from in info output

lib/client/client.go

@@ -7,7 +7,6 @@ import (
 
 	"github.com/theater/picomap/lib/halfsiphash"
 	"github.com/theater/picomap/lib/msgpack"
-	"io"
 )
 
 var HashKey = [8]byte{}
@@ -15,7 +14,7 @@ var HashKey = [8]byte{}
 type transport interface {
 	Send(data []byte) error
 	SetReadTimeout(timeout time.Duration)
-	Reader() io.Reader
+	Recv() (data []byte, from string, err error)
 	Broadcast() bool
 	Close() error
 }
@@ -45,20 +44,28 @@ func (c *Client) send(msg any) (uint32, error) {
 	return id, c.transport.Send(data)
 }
 
-func roundTrip[T any](c *Client, req any) ([]*T, error) {
+type Response[T any] struct {
+	From  string
+	Value *T
+}
+
+func roundTrip[T any](c *Client, req any) ([]Response[T], error) {
 	id, err := c.send(req)
 	if err != nil {
 		return nil, err
 	}
 	c.transport.SetReadTimeout(c.timeout)
-	dec := msgpack.NewDecoder(c.transport.Reader())
 	broadcast := c.transport.Broadcast()
-	var results []*T
+	var results []Response[T]
 	for {
-		var env Envelope
-		if err := dec.Decode(&env); err != nil {
+		data, from, err := c.transport.Recv()
+		if err != nil {
 			break
 		}
+		var env Envelope
+		if err := msgpack.Unmarshal(data, &env); err != nil {
+			continue
+		}
 		if env.MessageID != id {
 			continue
 		}
@@ -74,7 +81,7 @@ func roundTrip[T any](c *Client, req any) ([]*T, error) {
 			return nil, devErr
 		}
 		if typed, ok := inner.(*T); ok {
-			results = append(results, typed)
+			results = append(results, Response[T]{From: from, Value: typed})
 			if !broadcast {
 				break
 			}
@@ -83,14 +90,14 @@ func roundTrip[T any](c *Client, req any) ([]*T, error) {
 	return results, nil
 }
 
-func first[T any](results []*T, err error) (*T, error) {
+func first[T any](results []Response[T], err error) (*T, error) {
 	if err != nil {
 		return nil, err
 	}
 	if len(results) == 0 {
 		return nil, fmt.Errorf("no response")
 	}
-	return results[0], nil
+	return results[0].Value, nil
 }
 
 func (c *Client) PICOBOOT() error {
@@ -102,7 +109,7 @@ func (c *Client) Info() (*ResponseInfo, error) {
 	return first(roundTrip[ResponseInfo](c, &RequestInfo{}))
 }
 
-func (c *Client) InfoAll() ([]*ResponseInfo, error) {
+func (c *Client) InfoAll() ([]Response[ResponseInfo], error) {
 	return roundTrip[ResponseInfo](c, &RequestInfo{})
 }
 

lib/client/serial.go

@@ -2,11 +2,11 @@ package client
 
 import (
 	"fmt"
-	"io"
 	"slices"
 	"strings"
 	"time"
 
+	"github.com/theater/picomap/lib/msgpack"
 	"go.bug.st/serial"
 	"go.bug.st/serial/enumerator"
 )
@@ -37,7 +37,9 @@ func ListSerial() ([]string, error) {
 }
 
 type serialTransport struct {
-	port serial.Port
+	port     serial.Port
+	portName string
+	dec      *msgpack.Decoder
 }
 
 func NewSerial(portName string, timeout time.Duration) (*Client, error) {
@@ -45,7 +47,8 @@ func NewSerial(portName string, timeout time.Duration) (*Client, error) {
 	if err != nil {
 		return nil, fmt.Errorf("opening %s: %w", portName, err)
 	}
-	return &Client{transport: &serialTransport{port: port}, timeout: timeout}, nil
+	t := &serialTransport{port: port, portName: portName, dec: msgpack.NewDecoder(port)}
+	return &Client{transport: t, timeout: timeout}, nil
 }
 
 func (t *serialTransport) Send(data []byte) error {
@@ -57,8 +60,12 @@ func (t *serialTransport) SetReadTimeout(timeout time.Duration) {
 	t.port.SetReadTimeout(timeout)
 }
 
-func (t *serialTransport) Reader() io.Reader {
-	return t.port
+func (t *serialTransport) Recv() ([]byte, string, error) {
+	var raw msgpack.RawMessage
+	if err := t.dec.Decode(&raw); err != nil {
+		return nil, "", err
+	}
+	return []byte(raw), t.portName, nil
 }
 
 func (t *serialTransport) Broadcast() bool { return false }

lib/client/udp.go

@@ -1,9 +1,7 @@
 package client
 
 import (
-	"bytes"
 	"fmt"
-	"io"
 	"net"
 	"syscall"
 	"time"
@@ -17,7 +15,6 @@ type udpTransport struct {
 	conn      *net.UDPConn
 	addr      *net.UDPAddr
 	broadcast bool
-	buf       bytes.Buffer
 }
 
 func interfaceIPv4Net(name string) (net.IP, *net.IPNet, error) {
@@ -117,21 +114,13 @@ func (t *udpTransport) SetReadTimeout(timeout time.Duration) {
 	t.conn.SetReadDeadline(time.Now().Add(timeout))
 }
 
-func (t *udpTransport) Reader() io.Reader {
-	return t
-}
-
-func (t *udpTransport) Read(p []byte) (int, error) {
-	if t.buf.Len() > 0 {
-		return t.buf.Read(p)
-	}
-	pkt := make([]byte, 1500)
-	n, err := t.conn.Read(pkt)
+func (t *udpTransport) Recv() ([]byte, string, error) {
+	buf := make([]byte, 1500)
+	n, addr, err := t.conn.ReadFromUDP(buf)
 	if err != nil {
-		return 0, err
+		return nil, "", err
 	}
-	t.buf.Write(pkt[:n])
-	return t.buf.Read(p)
+	return buf[:n], addr.IP.String(), nil
 }
 
 func (t *udpTransport) Broadcast() bool { return t.broadcast }