102 lines
2.8 KiB
Go
102 lines
2.8 KiB
Go
package docker
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import (
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"bufio"
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"bytes"
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"context"
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"encoding/json"
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"github.com/docker/docker/api/types"
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"github.com/pkg/errors"
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"github.com/pterodactyl/wings/environment"
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"strconv"
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)
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type dockerLogLine struct {
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Log string `json:"log"`
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}
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var ErrNotAttached = errors.New("not attached to instance")
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func (e *Environment) setStream(s *types.HijackedResponse) {
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e.mu.Lock()
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e.stream = s
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e.mu.Unlock()
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}
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// Sends the specified command to the stdin of the running container instance. There is no
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// confirmation that this data is sent successfully, only that it gets pushed into the stdin.
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func (e *Environment) SendCommand(c string) error {
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if !e.IsAttached() {
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return ErrNotAttached
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}
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e.mu.RLock()
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defer e.mu.RUnlock()
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if e.meta.Stop != nil {
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// If the command being processed is the same as the process stop command then we want to mark
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// the server as entering the stopping state otherwise the process will stop and Wings will think
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// it has crashed and attempt to restart it.
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if e.meta.Stop.Type == "command" && c == e.meta.Stop.Value {
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e.Events().Publish(environment.StateChangeEvent, environment.ProcessStoppingState)
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}
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}
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_, err := e.stream.Conn.Write([]byte(c + "\n"))
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return errors.WithStack(err)
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}
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// Reads the log file for the server. This does not care if the server is running or not, it will
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// simply try to read the last X bytes of the file and return them.
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func (e *Environment) Readlog(lines int) ([]string, error) {
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r, err := e.client.ContainerLogs(context.Background(), e.Id, types.ContainerLogsOptions{
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ShowStdout: true,
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ShowStderr: true,
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Tail: strconv.Itoa(lines),
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})
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if err != nil {
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return nil, errors.WithStack(err)
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}
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defer r.Close()
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var out []string
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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out = append(out, scanner.Text())
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}
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return out, nil
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}
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// Docker stores the logs for server output in a JSON format. This function will iterate over the JSON
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// that was read from the log file and parse it into a more human readable format.
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func (e *Environment) parseLogToStrings(b []byte) ([]string, error) {
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var hasError = false
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var out []string
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scanner := bufio.NewScanner(bytes.NewReader(b))
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for scanner.Scan() {
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var l dockerLogLine
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// Unmarshal the contents and allow up to a single error before bailing out of the process. We
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// do this because if you're arbitrarily reading a length of the file you'll likely end up
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// with the first line in the output being improperly formatted JSON. In those cases we want to
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// just skip over it. However if we see another error we're going to bail out because that is an
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// abnormal situation.
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if err := json.Unmarshal([]byte(scanner.Text()), &l); err != nil {
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if hasError {
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return nil, err
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}
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hasError = true
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continue
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}
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out = append(out, l.Log)
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}
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return out, nil
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}
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