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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,196 @@ | ||
| package simple_serial | ||
|
|
||
| import ( | ||
| "errors" | ||
| "os" | ||
| "path/filepath" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/rs/zerolog/log" | ||
| "github.com/wizzomafizzo/tapto/pkg/config" | ||
| "github.com/wizzomafizzo/tapto/pkg/readers" | ||
| "github.com/wizzomafizzo/tapto/pkg/tokens" | ||
| "github.com/wizzomafizzo/tapto/pkg/utils" | ||
|
|
||
| "go.bug.st/serial" | ||
| ) | ||
|
|
||
| type SimpleSerialReader struct { | ||
| cfg *config.UserConfig | ||
| device string | ||
| path string | ||
| polling bool | ||
| port serial.Port | ||
| lastToken *tokens.Token | ||
| } | ||
|
|
||
| func NewReader(cfg *config.UserConfig) *SimpleSerialReader { | ||
| return &SimpleSerialReader{ | ||
| cfg: cfg, | ||
| } | ||
| } | ||
|
|
||
| func (r *SimpleSerialReader) Ids() []string { | ||
| return []string{"simple_serial"} | ||
| } | ||
|
|
||
| func (r *SimpleSerialReader) parseLine(line string) (*tokens.Token, error) { | ||
| line = strings.TrimSpace(line) | ||
| line = strings.Trim(line, "\r") | ||
|
|
||
| if len(line) == 0 { | ||
| return nil, nil | ||
| } | ||
|
|
||
| if !strings.HasPrefix(line, "SCAN\t") { | ||
| return nil, nil | ||
| } | ||
|
|
||
| args := line[5:] | ||
| if len(args) == 0 { | ||
| return nil, nil | ||
| } | ||
|
|
||
| t := tokens.Token{ | ||
| Data: line, | ||
| ScanTime: time.Now(), | ||
| Source: r.device, | ||
| } | ||
|
|
||
| ps := strings.Split(args, "\t") | ||
| for i := 0; i < len(ps); i++ { | ||
| ps[i] = strings.TrimSpace(ps[i]) | ||
| if strings.HasPrefix(ps[i], "uid=") { | ||
| t.UID = ps[i][4:] | ||
| } else if strings.HasPrefix(ps[i], "text=") { | ||
| t.Text = ps[i][5:] | ||
| } | ||
| } | ||
|
|
||
| return &t, nil | ||
| } | ||
|
|
||
| func (r *SimpleSerialReader) Open(device string, iq chan<- readers.Scan) error { | ||
| ps := strings.SplitN(device, ":", 2) | ||
| if len(ps) != 2 { | ||
| return errors.New("invalid device string: " + device) | ||
| } | ||
|
|
||
| if !utils.Contains(r.Ids(), ps[0]) { | ||
| return errors.New("invalid reader id: " + ps[0]) | ||
| } | ||
|
|
||
| path := ps[1] | ||
|
|
||
| if !filepath.IsAbs(path) { | ||
| return errors.New("invalid device path, must be absolute") | ||
| } | ||
|
|
||
| if _, err := os.Stat(path); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| port, err := serial.Open(path, &serial.Mode{ | ||
| BaudRate: 115200, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| err = port.SetReadTimeout(100 * time.Millisecond) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| r.port = port | ||
| r.device = device | ||
| r.path = path | ||
| r.polling = true | ||
|
|
||
| go func() { | ||
| var lineBuf []byte | ||
|
|
||
| for r.polling { | ||
| time.Sleep(100 * time.Millisecond) | ||
|
|
||
| buf := make([]byte, 4096) | ||
| n, err := r.port.Read(buf) | ||
| if err != nil { | ||
| log.Error().Err(err).Msg("failed to read from serial port") | ||
| err = r.Close() | ||
| if err != nil { | ||
| log.Error().Err(err).Msg("failed to close serial port") | ||
| } | ||
| break | ||
| } | ||
|
|
||
| for i := 0; i < n; i++ { | ||
| if buf[i] == '\n' { | ||
| line := string(lineBuf) | ||
| lineBuf = nil | ||
|
|
||
| t, err := r.parseLine(line) | ||
| if err != nil { | ||
| log.Error().Err(err).Msg("failed to parse line") | ||
| continue | ||
| } | ||
|
|
||
| if t != nil && !utils.TokensEqual(t, r.lastToken) { | ||
| iq <- readers.Scan{ | ||
| Source: r.device, | ||
| Token: t, | ||
| } | ||
| } | ||
|
|
||
| if t != nil { | ||
| r.lastToken = t | ||
| } | ||
| } else { | ||
| lineBuf = append(lineBuf, buf[i]) | ||
| } | ||
| } | ||
|
|
||
| if r.lastToken != nil && time.Since(r.lastToken.ScanTime) > 1*time.Second { | ||
| iq <- readers.Scan{ | ||
| Source: r.device, | ||
| Token: nil, | ||
| } | ||
| r.lastToken = nil | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (r *SimpleSerialReader) Close() error { | ||
| r.polling = false | ||
| if r.port != nil { | ||
| err := r.port.Close() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (r *SimpleSerialReader) Detect(connected []string) string { | ||
| return "" | ||
| } | ||
|
|
||
| func (r *SimpleSerialReader) Device() string { | ||
| return r.device | ||
| } | ||
|
|
||
| func (r *SimpleSerialReader) Connected() bool { | ||
| return r.polling && r.port != nil | ||
| } | ||
|
|
||
| func (r *SimpleSerialReader) Info() string { | ||
| return r.path | ||
| } | ||
|
|
||
| func (r *SimpleSerialReader) Write(text string) (*tokens.Token, error) { | ||
| return nil, errors.New("writing not supported on this reader") | ||
| } |