return race results immediately instead of waiting for race to finish

Dockerfile

@@ -1 +1,50 @@
+# Start with a Go base image
+FROM golang:1.21-bullseye as builder
 
+# Install dependencies for cross-compilation
+RUN apt-get update && apt-get install -y \
+    gcc-aarch64-linux-gnu \
+    libc6-dev-arm64-cross \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set up working directory
+WORKDIR /app
+
+# Copy go.mod and go.sum files first for better caching
+COPY go.mod ./
+# COPY go.sum ./ # Uncomment if you have a go.sum file
+
+# Download dependencies
+RUN go mod download
+
+# Copy the source code
+COPY . .
+
+# Set environment variables for cross-compilation to ARM64 (Raspberry Pi 4)
+ENV GOOS=linux
+ENV GOARCH=arm64
+ENV CC=aarch64-linux-gnu-gcc
+ENV CGO_ENABLED=1
+
+# Build the application
+RUN go build -o track-gopher-arm64 ./examples/main.go
+
+# Create a minimal runtime image
+FROM arm64v8/debian:bullseye-slim
+
+# Install required runtime dependencies
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set up working directory
+WORKDIR /app
+
+# Copy the binary from the builder stage
+COPY --from=builder /app/track-gopher-arm64 .
+
+# Make the binary executable
+RUN chmod +x ./track-gopher-arm64
+
+# Command to run when the container starts
+ENTRYPOINT ["./track-gopher-arm64"] 

derby/derby.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"io"
 	"strconv"
-	"strings"
 	"sync"
 	"time"
 
@@ -161,12 +160,16 @@ func (dc *DerbyClock) Results() []*Result {
 
 // readLoop continuously reads from the serial port
 func (dc *DerbyClock) readLoop() {
+	buffer := make([]byte, 0, 256)
+
 	for {
 		select {
 		case <-dc.stopReading:
 			return
 		default:
-			line, err := dc.reader.ReadString('\n')
+			// Read a single byte
+			b := make([]byte, 1)
+			_, err := dc.port.Read(b)
 			if err != nil {
 				if err != io.EOF {
 					// Only log if it's not EOF
@@ -176,19 +179,11 @@ func (dc *DerbyClock) readLoop() {
 				continue
 			}
 
-			// Process the line
-			dc.processLine(line)
-		}
-	}
-}
-
-// processLine handles a line of text from the derby clock
-func (dc *DerbyClock) processLine(line string) {
-	// Trim any whitespace and carriage returns
-	line = strings.TrimSpace(line)
+			// Add the byte to our buffer
+			buffer = append(buffer, b[0])
 
-	if line == "C" {
-		// Race has started
+			// Check for race start signal "C\r\n"
+			if len(buffer) >= 3 && string(buffer[len(buffer)-3:]) == "C\r\n" {
 				dc.mu.Lock()
 				dc.status = StatusRunning
 				dc.results = nil
@@ -196,83 +191,108 @@ func (dc *DerbyClock) processLine(line string) {
 
 				// Send race start event
 				dc.eventChan <- Event{Type: EventRaceStart}
-		return
-	}
 
-	// Check if this is a results line
-	if strings.Contains(line, "=") {
-		results := parseResults(line)
+				// Clear the buffer
+				buffer = buffer[:0]
+				continue
+			}
 
+			// Check for lane result pattern (n=t.ttttc)
+			// We need to look for an equals sign followed by digits, a period, more digits, and a finish character
+			if b[0] == '=' || b[0] == ' ' || b[0] == '\r' || b[0] == '\n' {
+				// These characters could indicate a complete result or a separator
+				// Try to extract a result from the buffer
+				result := dc.tryExtractResult(buffer)
+				if result != nil {
 					dc.mu.Lock()
-		// Add results to our stored results
-		for _, result := range results {
+					// Add result to our stored results
 					dc.results = append(dc.results, result)
 
+					// Determine finish place based on how many results we have
+					result.FinishPlace = len(dc.results)
+					dc.mu.Unlock()
+
 					// Send lane finish event
 					dc.eventChan <- Event{
 						Type:   EventLaneFinish,
 						Result: result,
 					}
-		}
 
-		// If we have results, the race is now finished
-		if len(results) > 0 {
+					// If we hit a newline, this might be the end of all results
+					if b[0] == '\n' {
+						// Check if we should consider the race complete
+						dc.mu.Lock()
+						if dc.status == StatusRunning {
 							dc.status = StatusFinished
+							dc.mu.Unlock()
 
 							// Send race complete event
 							dc.eventChan <- Event{Type: EventRaceComplete}
-		}
+						} else {
 							dc.mu.Unlock()
 						}
+
+						// Clear the buffer after a newline
+						buffer = buffer[:0]
+					}
+				}
+			}
+		}
+	}
 }
 
-// parseResults parses a line of results from the derby clock
-func parseResults(line string) []*Result {
-	parts := strings.Split(line, " ")
-	results := make([]*Result, 0, len(parts))
+// tryExtractResult attempts to extract a lane result from the buffer
+func (dc *DerbyClock) tryExtractResult(buffer []byte) *Result {
+	// Convert buffer to string for easier processing
+	bufStr := string(buffer)
 
-	for i, part := range parts {
-		if !strings.Contains(part, "=") {
-			continue
+	// Look for the pattern: n=t.ttttc
+	// where n is the lane number, t.tttt is the time, and c is the finish character
+	for i := 0; i < len(bufStr); i++ {
+		if bufStr[i] == '=' {
+			// Found an equals sign, try to extract a lane number before it
+			j := i - 1
+			for j >= 0 && bufStr[j] >= '0' && bufStr[j] <= '9' {
+				j--
 			}
+			j++ // Move back to the first digit
 
-		// Format is "n=0.0000c"
-		laneStr := strings.Split(part, "=")[0]
-		timeAndPlace := strings.Split(part, "=")[1]
+			if j < i { // We found at least one digit
+				laneStr := bufStr[j:i]
 
-		if len(timeAndPlace) < 2 {
-			continue
+				// Now look for the time and finish character after the equals sign
+				k := i + 1
+				for k < len(bufStr) && (bufStr[k] == '.' || (bufStr[k] >= '0' && bufStr[k] <= '9')) {
+					k++
 				}
 
-		// Extract time and place character
-		timeStr := timeAndPlace[:len(timeAndPlace)-1]
-		placeChar := timeAndPlace[len(timeAndPlace)-1:]
+				if k < len(bufStr) && k > i+1 { // We found a time and a finish character
+					timeStr := bufStr[i+1 : k]
+					finishChar := bufStr[k : k+1]
 
-		// Parse lane number
+					// Parse the lane number
 					lane, err := strconv.Atoi(laneStr)
 					if err != nil {
 						continue
 					}
 
-		// Parse time
+					// Parse the time
 					timeVal, err := strconv.ParseFloat(timeStr, 64)
 					if err != nil {
 						continue
 					}
 
-		// Determine place
-		place := i + 1
-
-		// Create result
-		result := &Result{
+					// Create and return the result
+					return &Result{
 						Lane:         lane,
 						Time:         timeVal,
-			FinishPlace:  place,
-			FinishSymbol: placeChar,
+						FinishPlace:  0, // Will be set by the caller
+						FinishSymbol: finishChar,
+					}
+				}
+			}
 		}
-
-		results = append(results, result)
 	}
 
-	return results
+	return nil
 }

go.mod

@@ -1,6 +1,6 @@
 module track-gopher
 
-go 1.23.5
+go 1.24.1
 
 require go.bug.st/serial v1.6.2