new: implemented can.dup and can.dump.inject to read a candump log file

modules/can/can_dump_reader.go

@@ -0,0 +1,76 @@
+package can
+
+import (
+	"bufio"
+	"context"
+	"os"
+	"regexp"
+
+	"github.com/evilsocket/islazy/str"
+	"go.einride.tech/can"
+)
+
+// (1700623093.260875) can0 7E0#0322128C00000000
+var dumpLineParser = regexp.MustCompile(`(?m)^\(([\d\.]+)\)\s+([^\s]+)\s+(.+)`)
+
+type dumpEntry struct {
+	Time   string
+	Device string
+	Frame  string
+}
+
+func (mod *CANModule) startDumpReader() error {
+	mod.Info("loading CAN dump from %s ...", mod.dumpName)
+
+	file, err := os.Open(mod.dumpName)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	entries := make([]dumpEntry, 0)
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := str.Trim(scanner.Text())
+		if line != "" {
+			if m := dumpLineParser.FindStringSubmatch(line); len(m) != 4 {
+				mod.Warning("unexpected line: '%s' -> %d matches", line, len(m))
+			} else {
+				entries = append(entries, dumpEntry{
+					Time:   m[1],
+					Device: m[2],
+					Frame:  m[3],
+				})
+			}
+		}
+	}
+
+	if err = scanner.Err(); err != nil {
+		return err
+	}
+
+	mod.Info("loaded %d entries from candump log", len(entries))
+
+	go func() {
+		mod.Info("candump reader started ...")
+
+		for _, entry := range entries {
+			frame := can.Frame{}
+			if err := frame.UnmarshalString(entry.Frame); err != nil {
+				mod.Error("could not unmarshal CAN frame: %v", err)
+				continue
+			}
+
+			if mod.dumpInject {
+				if err := mod.send.TransmitFrame(context.Background(), frame); err != nil {
+					mod.Error("could not send CAN frame: %v", err)
+				}
+			} else {
+				mod.onFrame(frame)
+			}
+		}
+	}()
+
+	return nil
+}