Track wire bytes separately from decompressed stream bytes

The stream stats were showing decompressed data sizes, not actual wire
bandwidth. This change adds wire byte tracking by disabling automatic
gzip decompression in the HTTP client and wrapping the response body
with a counting reader before decompression. Both wire (compressed) and
decompressed bytes are now tracked and exposed in the API responses.

internal/streamer/streamer.go

@@ -4,9 +4,11 @@ package streamer
 
 import (
 	"bufio"
+	"compress/gzip"
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
 	"math"
 	"math/rand"
 	"net/http"
@@ -19,6 +21,25 @@ import (
 	"git.eeqj.de/sneak/routewatch/internal/ristypes"
 )
 
+// countingReader wraps an io.Reader and counts bytes read
+type countingReader struct {
+	reader io.Reader
+	count  int64
+}
+
+// Read implements io.Reader and counts bytes
+func (c *countingReader) Read(p []byte) (int, error) {
+	n, err := c.reader.Read(p)
+	atomic.AddInt64(&c.count, int64(n))
+
+	return n, err
+}
+
+// Count returns the total bytes read
+func (c *countingReader) Count() int64 {
+	return atomic.LoadInt64(&c.count)
+}
+
 // Configuration constants for the RIS Live streamer.
 const (
 	risLiveURL = "https://ris-live.ripe.net/v1/stream/?format=json&" +
@@ -103,6 +124,10 @@ func New(logger *logger.Logger, metrics *metrics.Tracker) *Streamer {
 		logger: logger,
 		client: &http.Client{
 			Timeout: 0, // No timeout for streaming
+			Transport: &http.Transport{
+				// Disable automatic gzip decompression so we can measure wire bytes
+				DisableCompression: true,
+			},
 		},
 		handlers: make([]*handlerInfo, 0),
 		metrics:  metrics,
@@ -316,16 +341,18 @@ func (s *Streamer) logMetrics() {
 		uptime,
 		"total_messages",
 		metrics.TotalMessages,
-		"total_bytes",
+		"wire_bytes",
+		metrics.TotalWireBytes,
+		"wire_mb",
+		fmt.Sprintf("%.2f", float64(metrics.TotalWireBytes)/bytesPerMB),
+		"wire_mbps",
+		fmt.Sprintf("%.2f", metrics.WireBitsPerSec/bitsPerMegabit),
+		"decompressed_bytes",
 		metrics.TotalBytes,
-		"total_mb",
+		"decompressed_mb",
 		fmt.Sprintf("%.2f", float64(metrics.TotalBytes)/bytesPerMB),
 		"messages_per_sec",
 		fmt.Sprintf("%.2f", metrics.MessagesPerSec),
-		"bits_per_sec",
-		fmt.Sprintf("%.0f", metrics.BitsPerSec),
-		"mbps",
-		fmt.Sprintf("%.2f", metrics.BitsPerSec/bitsPerMegabit),
 		"total_dropped",
 		totalDropped,
 	)
@@ -438,6 +465,9 @@ func (s *Streamer) stream(ctx context.Context) error {
 		return fmt.Errorf("failed to create request: %w", err)
 	}
 
+	// Explicitly request gzip compression
+	req.Header.Set("Accept-Encoding", "gzip")
+
 	resp, err := s.client.Do(req)
 	if err != nil {
 		return fmt.Errorf("failed to connect to RIS Live: %w", err)
@@ -452,9 +482,28 @@ func (s *Streamer) stream(ctx context.Context) error {
 		return fmt.Errorf("unexpected status code: %d", resp.StatusCode)
 	}
 
-	s.logger.Info("Connected to RIS Live stream")
+	// Wrap body with counting reader to track actual wire bytes
+	wireCounter := &countingReader{reader: resp.Body}
+
+	// Check if response is gzip-compressed and decompress if needed
+	var reader io.Reader = wireCounter
+	if resp.Header.Get("Content-Encoding") == "gzip" {
+		gzReader, err := gzip.NewReader(wireCounter)
+		if err != nil {
+			return fmt.Errorf("failed to create gzip reader: %w", err)
+		}
+		defer func() { _ = gzReader.Close() }()
+		reader = gzReader
+		s.logger.Info("Connected to RIS Live stream", "compression", "gzip")
+	} else {
+		s.logger.Info("Connected to RIS Live stream", "compression", "none")
+	}
+
 	s.metrics.SetConnected(true)
 
+	// Track wire bytes for metrics updates
+	var lastWireBytes int64
+
 	// Start metrics logging goroutine
 	metricsTicker := time.NewTicker(metricsLogInterval)
 	defer metricsTicker.Stop()
@@ -470,7 +519,27 @@ func (s *Streamer) stream(ctx context.Context) error {
 		}
 	}()
 
-	scanner := bufio.NewScanner(resp.Body)
+	// Wire byte update ticker - update metrics with actual wire bytes periodically
+	wireUpdateTicker := time.NewTicker(time.Second)
+	defer wireUpdateTicker.Stop()
+
+	go func() {
+		for {
+			select {
+			case <-wireUpdateTicker.C:
+				currentBytes := wireCounter.Count()
+				delta := currentBytes - lastWireBytes
+				if delta > 0 {
+					s.metrics.RecordWireBytes(delta)
+					lastWireBytes = currentBytes
+				}
+			case <-ctx.Done():
+				return
+			}
+		}
+	}()
+
+	scanner := bufio.NewScanner(reader)
 
 	for scanner.Scan() {
 		select {
@@ -486,7 +555,7 @@ func (s *Streamer) stream(ctx context.Context) error {
 			continue
 		}
 
-		// Update metrics with message size
+		// Update metrics with decompressed message size
 		s.updateMetrics(len(line))
 
 		// Call raw handler if registered