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parentPart.go
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parentPart.go
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package pipes
import (
"bufio"
"io"
"os"
"strings"
logger "github.com/bhagyaraj1208117/andes-logger-xyz"
)
const logLinesSinkName = "logLinesSink"
const textOutputSinkName = "textOutputSink"
type parentPart struct {
childName string
messenger *ParentMessenger
logLinesSink logger.Logger
textOutputSink logger.Logger
logLineMarshalizer logger.Marshalizer
loopState partLoopState
logsReader *os.File
logsWriter *os.File
profileReader *os.File
profileWriter *os.File
}
// NewParentPart creates a new logs receiver part (in the parent process)
func NewParentPart(childName string, logLineMarshalizer logger.Marshalizer) (*parentPart, error) {
part := &parentPart{
childName: childName,
logLinesSink: logger.GetOrCreate(logLinesSinkName),
textOutputSink: logger.GetOrCreate(textOutputSinkName),
logLineMarshalizer: logLineMarshalizer,
}
err := part.initializePipes()
if err != nil {
return nil, err
}
part.initializeMessenger()
return part, nil
}
func (part *parentPart) initializePipes() error {
var err error
part.logsReader, part.logsWriter, err = os.Pipe()
if err != nil {
return err
}
part.profileReader, part.profileWriter, err = os.Pipe()
if err != nil {
return err
}
return nil
}
func (part *parentPart) initializeMessenger() {
part.messenger = NewParentMessenger(part.logsReader, part.profileWriter, part.logLineMarshalizer)
}
// GetChildPipes gets the two pipes that should be fed to a child process
func (part *parentPart) GetChildPipes() (*os.File, *os.File) {
return part.profileReader, part.logsWriter
}
// StartLoop starts the logs reading loop and starts listening for log profile changes (in order to forward them)
func (part *parentPart) StartLoop(childStdout io.Reader, childStderr io.Reader) error {
if !part.loopState.isInit() {
return ErrInvalidOperationGivenPartLoopState
}
part.loopState.setRunning()
logger.SubscribeToProfileChange(part)
part.forwardProfile()
part.continuouslyRead(childStdout, childStderr)
return nil
}
// OnProfileChanged is called when a log profile changes
func (part *parentPart) OnProfileChanged() {
part.forwardProfile()
}
func (part *parentPart) forwardProfile() {
profile := logger.GetCurrentProfile()
err := part.messenger.SendProfile(profile)
if err != nil {
part.logLinesSink.Debug("parentPart.forwardProfile()", "err", err)
}
}
func (part *parentPart) continuouslyRead(childStdout io.Reader, childStderr io.Reader) {
go part.continuouslyReadLogLines()
go part.continuouslyReadStdout(childStdout)
go part.continuouslyReadStderr(childStderr)
}
func (part *parentPart) continuouslyReadLogLines() {
for {
if !part.loopState.isRunning() {
break
}
logLine, err := part.messenger.ReadLogLine()
if err != nil {
part.logLinesSink.Debug("parentPart.continuouslyReadLogLines()", "err", err)
break
}
part.logLinesSink.LogLine(logLine)
}
}
func (part *parentPart) continuouslyReadStdout(stdout io.Reader) {
stdoutReader := bufio.NewReader(stdout)
for {
if !part.loopState.isRunning() {
break
}
textLine, err := stdoutReader.ReadString('\n')
if err != nil {
break
}
textLine = strings.TrimSpace(textLine)
part.textOutputSink.Trace(part.childName, "line", textLine)
}
}
func (part *parentPart) continuouslyReadStderr(stderr io.Reader) {
stderrReader := bufio.NewReader(stderr)
for {
if !part.loopState.isRunning() {
break
}
textLine, err := stderrReader.ReadString('\n')
if err != nil {
break
}
textLine = strings.TrimSpace(textLine)
part.textOutputSink.Error(part.childName, "line", textLine)
}
}
// StopLoop closes all the pipes and stops listening for log profile changes
func (part *parentPart) StopLoop() {
part.loopState.setStopped()
logger.UnsubscribeFromProfileChange(part)
_ = part.logsReader.Close()
_ = part.logsWriter.Close()
_ = part.profileReader.Close()
_ = part.profileWriter.Close()
}