mirror of
https://github.com/mudler/luet.git
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78 lines
2.3 KiB
Go
78 lines
2.3 KiB
Go
// Copyright © 2020 Ettore Di Giacinto <mudler@mocaccino.org>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, see <http://www.gnu.org/licenses/>.
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package pluggable
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import (
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"bytes"
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"encoding/json"
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"io/ioutil"
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"os"
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"os/exec"
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"github.com/pkg/errors"
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)
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// Plugin describes binaries to be hooked on events, with common js input, and common js output
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type Plugin struct {
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Name string
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Executable string
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}
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// A safe threshold to avoid unpleasant exec buffer fill for argv too big. Seems 128K is the limit on Linux.
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const maxMessageSize = 1 << 13
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// Run runs the Event on the plugin, and returns an EventResponse
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func (p Plugin) Run(e Event) (EventResponse, error) {
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r := EventResponse{}
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eventToprocess := &e
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if len(e.Data) > maxMessageSize {
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copy := e.Copy()
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copy.Data = ""
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f, err := ioutil.TempFile(os.TempDir(), "pluggable")
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if err != nil {
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return r, errors.Wrap(err, "while creating temporary file")
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}
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if err := ioutil.WriteFile(f.Name(), []byte(e.Data), os.ModePerm); err != nil {
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return r, errors.Wrap(err, "while writing to temporary file")
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}
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copy.File = f.Name()
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eventToprocess = copy
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defer os.RemoveAll(f.Name())
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}
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k, err := eventToprocess.JSON()
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if err != nil {
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return r, errors.Wrap(err, "while marshalling event")
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}
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cmd := exec.Command(p.Executable, string(e.Name), k)
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cmd.Env = os.Environ()
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var b bytes.Buffer
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cmd.Stderr = &b
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out, err := cmd.Output()
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if err != nil {
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r.Error = "error while executing plugin: " + err.Error() + string(b.String())
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return r, errors.Wrap(err, "while executing plugin: "+string(b.String()))
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}
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if err := json.Unmarshal(out, &r); err != nil {
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r.Error = err.Error()
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return r, errors.Wrap(err, "while unmarshalling response")
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}
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return r, nil
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}
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