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package goagi |
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import ( |
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"bufio" |
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"fmt" |
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"strings" |
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"time" |
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) |
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// AGI interface structure |
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type AGI struct { |
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env map[string]string |
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arg []string |
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io *bufio.ReadWriter |
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} |
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const respTout = time.Millisecond * 100 |
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var ( |
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// error returned when AGI environment header is not valid |
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EInvalEnv = errorNew("Invalid AGI env variable") |
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// error returned when response read is timed out |
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ERespTout = errorNew("Response receive timeout") |
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) |
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func newInterface(iodev *bufio.ReadWriter) (*AGI, error) { |
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agi := &AGI{make(map[string]string), make([]string, 0), iodev} |
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scanner := bufio.NewScanner(iodev) |
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for scanner.Scan() { |
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line := scanner.Text() |
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if line == "" { |
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break |
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} |
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if err := agi.setEnv(line); err != nil { |
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return nil, err |
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} |
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} |
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if err := scanner.Err(); err != nil { |
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return nil, err |
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} |
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return agi, nil |
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} |
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// Env returns AGI environment variable by key |
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func (agi *AGI) Env(key string) string { |
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val, ok := agi.env[key] |
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if ok { |
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return val |
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} |
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return "" |
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} |
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// EnvArgs returns list of environment arguments |
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func (agi *AGI) EnvArgs() []string { |
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return agi.arg |
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} |
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func (agi *AGI) setEnv(line string) error { |
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if !strings.HasPrefix(line, "agi_") { |
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return EInvalEnv.withInfo(line) |
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} |
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idx := strings.Index(line, ": ") |
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if idx == -1 { |
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return EInvalEnv.withInfo(line) |
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} |
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if strings.HasPrefix(line, "agi_arg_") { |
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agi.arg = append(agi.arg, line[idx+2:]) |
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} else { |
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agi.env[line[4:idx]] = line[idx+2:] |
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} |
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return nil |
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} |
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func (agi *AGI) execute(cmd string, args ...interface{}) (*agiResp, error) { |
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_, err := agi.io.WriteString(compileCmd(cmd, args...)) |
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if err != nil { |
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return nil, err |
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} |
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agi.io.Flush() |
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chStr, chErr := agi.read() |
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select { |
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case str := <-chStr: |
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return parseResponse(str) |
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case err := <-chErr: |
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return nil, err |
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case <-time.After(respTout): |
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return nil, ERespTout |
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} |
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} |
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func (agi *AGI) read() (chan string, chan error) { |
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chStr := make(chan string) |
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chErr := make(chan error) |
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go func() { |
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defer close(chStr) |
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defer close(chErr) |
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str, err := agi.io.ReadString('\n') |
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if err != nil { |
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chErr <- err |
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return |
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} |
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if !strings.HasPrefix(str, "520-") { |
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chStr <- str |
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return |
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} |
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for { |
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s, err := agi.io.ReadString('\n') |
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if err != nil { |
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chErr <- err |
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return |
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} |
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str += s |
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if strings.HasPrefix(s, "520 End") { |
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chStr <- str |
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return |
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} |
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} |
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}() |
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return chStr, chErr |
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} |
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func compileCmd(cmd string, args ...interface{}) string { |
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for _, arg := range args { |
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val := fmt.Sprintf("%v", arg) |
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if len(val) > 0 { |
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cmd = fmt.Sprintf("%s %s", cmd, val) |
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} else { |
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cmd = fmt.Sprintf("%s \"\"", cmd) |
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} |
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} |
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134
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return fmt.Sprintf("%s\n", cmd) |
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} |
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staskobzar /
goagi
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