152 lines
3.2 KiB
Go
152 lines
3.2 KiB
Go
package provider
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import (
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"context"
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"errors"
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"os/exec"
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"strconv"
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"strings"
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"time"
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"github.com/andig/evcc/api"
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"github.com/kballard/go-shellquote"
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)
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var log = api.NewLogger("exec")
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func truish(s string) bool {
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return s == "1" || strings.ToLower(s) == "true" || strings.ToLower(s) == "on"
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}
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// Script implements shell script-based providers and setters
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type Script struct {
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timeout time.Duration
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}
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// NewScriptProvider creates a script provider.
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// Script execution is aborted after given timeout.
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func NewScriptProvider(timeout time.Duration) *Script {
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return &Script{
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timeout: timeout,
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}
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}
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// StringGetter returns string from exec result. Only STDOUT is considered.
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func (e *Script) StringGetter(script string) StringGetter {
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args, err := shellquote.Split(script)
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if err != nil {
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panic(err)
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} else if len(args) < 1 {
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panic("exec: missing script")
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}
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// return func to access cached value
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return func() (string, error) {
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ctx, cancel := context.WithTimeout(context.Background(), e.timeout)
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defer cancel()
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cmd := exec.CommandContext(ctx, args[0], args[1:]...)
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b, err := cmd.Output()
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s := strings.TrimSpace(string(b))
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if err != nil {
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// use STDOUT if available
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var ee *exec.ExitError
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if errors.As(err, &ee) {
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s = strings.TrimSpace(string(ee.Stderr))
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}
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log.ERROR.Printf("%s: %s", strings.Join(args, " "), s)
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return "", err
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}
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log.TRACE.Printf("%s: %s", strings.Join(args, " "), s)
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return s, nil
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}
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}
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// IntGetter parses int64 from exec result
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func (e *Script) IntGetter(script string) IntGetter {
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exec := e.StringGetter(script)
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// return func to access cached value
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return func() (int64, error) {
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s, err := exec()
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if err != nil {
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return 0, err
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}
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return strconv.ParseInt(s, 10, 64)
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}
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}
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// FloatGetter parses float from exec result
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func (e *Script) FloatGetter(script string) FloatGetter {
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exec := e.StringGetter(script)
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// return func to access cached value
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return func() (float64, error) {
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s, err := exec()
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if err != nil {
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return 0, err
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}
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return strconv.ParseFloat(s, 64)
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}
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}
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// BoolGetter parses bool from exec result. "on", "true" and 1 are considerd truish.
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func (e *Script) BoolGetter(script string) BoolGetter {
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exec := e.StringGetter(script)
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// return func to access cached value
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return func() (bool, error) {
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s, err := exec()
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if err != nil {
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return false, err
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}
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return truish(s), nil
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}
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}
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// IntSetter invokes script with parameter replaced by int value
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func (e *Script) IntSetter(param, script string) IntSetter {
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// return func to access cached value
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return func(i int64) error {
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cmd, err := replaceFormatted(script, map[string]interface{}{
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param: i,
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})
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if err != nil {
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return err
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}
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exec := e.StringGetter(cmd)
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if _, err := exec(); err != nil {
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return err
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}
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return nil
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}
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}
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// BoolSetter invokes script with parameter replaced by bool value
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func (e *Script) BoolSetter(param, script string) BoolSetter {
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// return func to access cached value
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return func(b bool) error {
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cmd, err := replaceFormatted(script, map[string]interface{}{
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param: b,
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})
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if err != nil {
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return err
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}
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exec := e.StringGetter(cmd)
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if _, err := exec(); err != nil {
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return err
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}
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return nil
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}
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}
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