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dynamic_definition.go
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dynamic_definition.go
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// Copyright 2023 Greenmask
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package custom
import (
"bufio"
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"os/exec"
"strings"
"syscall"
"github.com/greenmaskio/greenmask/internal/utils/reader"
"github.com/rs/zerolog/log"
"golang.org/x/sync/errgroup"
"github.com/greenmaskio/greenmask/pkg/toolkit"
)
func GetDynamicTransformerDefinition(ctx context.Context, executable string, args ...string) (*TransformerDefinition, error) {
log.Debug().
Str("Executable", executable).
Str("Args", strings.Join(args, " ")).
Msg("performing autodiscovery")
cmd := exec.Command(executable, args...)
stdout, err := cmd.StdoutPipe()
if err != nil {
return nil, fmt.Errorf("error openning stdout pipe: %w", err)
}
defer stdout.Close()
stderr, err := cmd.StderrPipe()
if err != nil {
return nil, fmt.Errorf("error openning stdout pipe: %w", err)
}
defer stderr.Close()
if err != nil {
log.Debug().
Err(err).
Str("Executable", executable).
Str("Args", strings.Join(args, " ")).
Msg("error executing custom transformer: cannot get definition")
return nil, fmt.Errorf("error executing custom transformer: %w", err)
}
if err = cmd.Start(); err != nil {
return nil, fmt.Errorf("error running custom transformer: %w", err)
}
doneChan := make(chan struct{})
var stdoutData, stderrData []byte
eg := &errgroup.Group{}
eg.Go(func() error {
defer close(doneChan)
var err error
stdoutData, err = io.ReadAll(stdout)
if err != nil {
return fmt.Errorf("error reading stdout pipe: %w", err)
}
stderrData, err = io.ReadAll(stderr)
if err != nil {
return fmt.Errorf("error reading stderr pipe: %w", err)
}
if err = cmd.Wait(); err != nil {
if len(stdoutData) > 0 {
log.Info().
Err(err).
Str("Executable", executable).
Str("Args", strings.Join(args, " ")).
Msg("custom transformer stdout forwarding")
buf := bufio.NewReader(bytes.NewBuffer(stdoutData))
for {
line, err := reader.ReadLine(buf)
if err != nil {
break
}
fmt.Printf("\tDATA: %s\n", string(line))
}
}
if len(stderrData) > 0 {
log.Info().
Err(err).
Str("Executable", executable).
Str("Args", strings.Join(args, " ")).
Msg("custom transformer stderr forwarding")
buf := bufio.NewReader(bytes.NewBuffer(stderrData))
for {
line, err := reader.ReadLine(buf)
if err != nil {
break
}
fmt.Printf("\tDATA: %s\n", string(line))
}
}
return fmt.Errorf("error running custom transformer: %w", err)
}
return nil
})
select {
case <-ctx.Done():
if ctx.Err() != nil {
log.Warn().Err(err).Msg("error performing autodiscovery")
}
if cmd.ProcessState != nil && !cmd.ProcessState.Exited() {
if err := cmd.Process.Signal(syscall.SIGTERM); err != nil {
log.Warn().
Err(err).
Int("TransformerPid", cmd.Process.Pid).
Msg("error sending SIGTERM to custom transformer process")
if cmd.ProcessState != nil && !cmd.ProcessState.Exited() {
log.Warn().
Int("TransformerPid", cmd.Process.Pid).
Msg("killing process")
if err = cmd.Process.Kill(); err != nil {
log.Warn().
Err(err).
Int("TransformerPid", cmd.Process.Pid).
Msg("error terminating custom transformer process")
}
}
}
}
return nil, ctx.Err()
case <-doneChan:
log.Debug().Msg("transformer auto discovery: exited normally")
}
if err = eg.Wait(); err != nil {
return nil, fmt.Errorf("error auto discover transformer: %w", err)
}
if len(stderrData) != 0 {
log.Info().
Err(err).
Str("Executable", executable).
Str("Args", strings.Join(args, " ")).
Msg("custom transformer stderr forwarding")
fmt.Printf("\tDATA: %s\n", string(stderrData))
}
if len(stdoutData) == 0 {
return nil, fmt.Errorf("received empty transformer definition: might be transfromer but or config mistake")
}
res := &TransformerDefinition{}
if err = json.Unmarshal(stdoutData, res); err != nil {
log.Debug().
Err(err).
Str("Executable", executable).
Str("Args", strings.Join(args, " ")).
RawJSON("Output", stdoutData).
Msg("error unmarshalling custom transformer output")
return nil, fmt.Errorf("error unmarshalling custom transformer output: %w", err)
}
if res.Driver == nil {
res.Driver = toolkit.DefaultRowDriverParams
}
if res.Driver.Name != "" && res.Driver.Name != JsonModeName && res.Driver.Name != CsvModeName && res.Driver.Name != TextModeName {
return nil, fmt.Errorf(`error parsing transformer difinition: unknown mode name %s`, res.Driver.Name)
}
if res.Driver.Name == "" {
res.Driver.Name = CsvModeName
}
return res, nil
}