64 lines
1.3 KiB
Go
64 lines
1.3 KiB
Go
package caster
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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errors2 "github.com/abelith/spellbook/internal/errors"
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"github.com/abelith/spellbook/internal/models"
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"github.com/google/shlex"
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"os/exec"
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"text/template"
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"time"
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)
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type SpellCaster struct{}
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func (sc *SpellCaster) Cast(ctx context.Context, cast models.SpellCast) (models.CastResult, error) {
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args, err := renderSpell(cast)
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if err != nil {
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return models.CastResult{}, err
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}
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cmd := exec.CommandContext(ctx, args[0], args[1:]...)
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cmd.Stdin = cast.Stdin
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cmd.Stdout = cast.Stdout
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cmd.Stderr = cast.Stderr
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start := time.Now()
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err = cmd.Run()
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duration := time.Since(start)
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res := models.CastResult{
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Duration: duration,
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}
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if err != nil {
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var exitErr *exec.ExitError
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if errors.As(err, &exitErr) {
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res.ExitCode = exitErr.ExitCode()
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res.Err = err
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return res, nil
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}
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return res, fmt.Errorf("%w: %w", errors2.ErrFailedToCast, err)
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}
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res.ExitCode = 0
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return res, nil
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}
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func renderSpell(cast models.SpellCast) ([]string, error) {
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tmpl, err := template.New(cast.Spell.Name).Option("missingkey=error").Parse(cast.Spell.Spell)
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if err != nil {
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return nil, err
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}
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buf := bytes.NewBuffer(nil)
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if err := tmpl.Execute(buf, cast.Args); err != nil {
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return nil, err
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}
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return shlex.Split(buf.String())
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}
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