173 lines
3.5 KiB
Go
173 lines
3.5 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/util"
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"github.com/kballard/go-shellquote"
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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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log *util.Logger
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script string
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timeout time.Duration
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cache time.Duration
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updated time.Time
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val string
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err error
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}
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func init() {
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registry.Add("script", NewScriptProviderFromConfig)
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}
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// NewScriptProviderFromConfig creates a script provider.
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func NewScriptProviderFromConfig(other map[string]interface{}) (IntProvider, error) {
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cc := struct {
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Cmd string
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Timeout time.Duration
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Cache time.Duration
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}{
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Timeout: 5 * time.Second,
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}
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if err := util.DecodeOther(other, &cc); err != nil {
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return nil, err
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}
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return NewScriptProvider(cc.Cmd, cc.Timeout, cc.Cache)
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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(script string, timeout time.Duration, cache time.Duration) (*Script, error) {
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s := &Script{
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log: util.NewLogger("script"),
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script: script,
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timeout: timeout,
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cache: cache,
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}
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return s, nil
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}
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func (e *Script) exec(script string) (string, error) {
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args, err := shellquote.Split(script)
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if err != nil {
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return "", err
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}
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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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e.log.ERROR.Printf("%s: %s", strings.Join(args, " "), s)
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return "", err
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}
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e.log.TRACE.Printf("%s: %s", strings.Join(args, " "), s)
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return s, nil
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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() func() (string, error) {
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return func() (string, error) {
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if time.Since(e.updated) > e.cache {
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e.val, e.err = e.exec(e.script)
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e.updated = time.Now()
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}
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return e.val, e.err
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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() func() (int64, error) {
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g := e.StringGetter()
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return func() (int64, error) {
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s, err := g()
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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() func() (float64, error) {
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g := e.StringGetter()
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return func() (float64, error) {
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s, err := g()
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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 considered truish.
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func (e *Script) BoolGetter() func() (bool, error) {
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g := e.StringGetter()
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return func() (bool, error) {
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s, err := g()
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if err != nil {
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return false, err
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}
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return util.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 string) func(int64) error {
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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 := util.ReplaceFormatted(e.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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_, err = e.exec(cmd)
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}
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return err
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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 string) func(bool) error {
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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 := util.ReplaceFormatted(e.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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_, err = e.exec(cmd)
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}
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return err
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}
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}
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