Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/processors/execd/execd.go

@@ -0,0 +1,184 @@
+//go:generate ../../../tools/readme_config_includer/generator
+package execd
+
+import (
+	"bufio"
+	_ "embed"
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/config"
+	"github.com/influxdata/telegraf/internal/process"
+	"github.com/influxdata/telegraf/models"
+	"github.com/influxdata/telegraf/plugins/parsers/influx"
+	"github.com/influxdata/telegraf/plugins/processors"
+)
+
+//go:embed sample.conf
+var sampleConfig string
+
+type Execd struct {
+	Command      []string        `toml:"command"`
+	Environment  []string        `toml:"environment"`
+	RestartDelay config.Duration `toml:"restart_delay"`
+	Log          telegraf.Logger
+
+	parser     telegraf.Parser
+	serializer telegraf.Serializer
+	acc        telegraf.Accumulator
+	process    *process.Process
+}
+
+func (e *Execd) SetParser(p telegraf.Parser) {
+	e.parser = p
+}
+
+func (e *Execd) SetSerializer(s telegraf.Serializer) {
+	e.serializer = s
+}
+
+func (*Execd) SampleConfig() string {
+	return sampleConfig
+}
+
+func (e *Execd) Start(acc telegraf.Accumulator) error {
+	e.acc = acc
+
+	var err error
+	e.process, err = process.New(e.Command, e.Environment)
+	if err != nil {
+		return fmt.Errorf("error creating new process: %w", err)
+	}
+	e.process.Log = e.Log
+	e.process.RestartDelay = time.Duration(e.RestartDelay)
+	e.process.ReadStdoutFn = e.cmdReadOut
+	e.process.ReadStderrFn = e.cmdReadErr
+
+	if err = e.process.Start(); err != nil {
+		// if there was only one argument, and it contained spaces, warn the user
+		// that they may have configured it wrong.
+		if len(e.Command) == 1 && strings.Contains(e.Command[0], " ") {
+			e.Log.Warn("The processors.execd Command contained spaces but no arguments. " +
+				"This setting expects the program and arguments as an array of strings, " +
+				"not as a space-delimited string. See the plugin readme for an example.")
+		}
+		return fmt.Errorf("failed to start process %s: %w", e.Command, err)
+	}
+
+	return nil
+}
+
+func (e *Execd) Add(m telegraf.Metric, _ telegraf.Accumulator) error {
+	b, err := e.serializer.Serialize(m)
+	if err != nil {
+		return fmt.Errorf("metric serializing error: %w", err)
+	}
+
+	_, err = e.process.Stdin.Write(b)
+	if err != nil {
+		return fmt.Errorf("error writing to process stdin: %w", err)
+	}
+
+	// We cannot maintain tracking metrics at the moment because input/output
+	// is done asynchronously and we don't have any metric metadata to tie the
+	// output metric back to the original input metric.
+	m.Accept()
+	return nil
+}
+
+func (e *Execd) Stop() {
+	e.process.Stop()
+}
+
+func (e *Execd) cmdReadOut(out io.Reader) {
+	// Prefer using the StreamParser when parsing influx format.
+	var parser telegraf.Parser
+	if rp, ok := e.parser.(*models.RunningParser); ok {
+		parser = rp.Parser
+	} else {
+		parser = e.parser
+	}
+
+	if _, isInfluxParser := parser.(*influx.Parser); isInfluxParser {
+		e.cmdReadOutStream(out)
+		return
+	}
+
+	scanner := bufio.NewScanner(out)
+	scanBuf := make([]byte, 4096)
+	scanner.Buffer(scanBuf, 262144)
+
+	for scanner.Scan() {
+		metrics, err := e.parser.Parse(scanner.Bytes())
+		if err != nil {
+			e.Log.Errorf("Parse error: %s", err)
+		}
+
+		for _, metric := range metrics {
+			e.acc.AddMetric(metric)
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		e.Log.Errorf("Error reading stdout: %s", err)
+	}
+}
+
+func (e *Execd) cmdReadOutStream(out io.Reader) {
+	parser := influx.NewStreamParser(out)
+
+	for {
+		metric, err := parser.Next()
+
+		if err != nil {
+			// Stop parsing when we've reached the end.
+			if errors.Is(err, influx.EOF) {
+				break
+			}
+
+			var parseErr *influx.ParseError
+			if errors.As(err, &parseErr) {
+				// Continue past parse errors.
+				e.acc.AddError(parseErr)
+				continue
+			}
+
+			// Stop reading on any non-recoverable error.
+			e.acc.AddError(err)
+			return
+		}
+
+		e.acc.AddMetric(metric)
+	}
+}
+
+func (e *Execd) cmdReadErr(out io.Reader) {
+	scanner := bufio.NewScanner(out)
+
+	for scanner.Scan() {
+		e.Log.Errorf("stderr: %q", scanner.Text())
+	}
+
+	if err := scanner.Err(); err != nil {
+		e.Log.Errorf("Error reading stderr: %s", err)
+	}
+}
+
+func (e *Execd) Init() error {
+	if len(e.Command) == 0 {
+		return errors.New("no command specified")
+	}
+	return nil
+}
+
+func init() {
+	processors.AddStreaming("execd", func() telegraf.StreamingProcessor {
+		return &Execd{
+			RestartDelay: config.Duration(10 * time.Second),
+		}
+	})
+}