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udp.go
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udp.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package udp // import "github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/operator/input/udp"
import (
"bufio"
"bytes"
"context"
"fmt"
"net"
"strconv"
"sync"
"go.uber.org/zap"
"golang.org/x/text/encoding"
"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/decoder"
"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/operator"
"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/operator/helper"
"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/tokenize"
)
const (
operatorType = "udp_input"
// Maximum UDP packet size
MaxUDPSize = 64 * 1024
)
func init() {
operator.Register(operatorType, func() operator.Builder { return NewConfig() })
}
// NewConfig creates a new UDP input config with default values
func NewConfig() *Config {
return NewConfigWithID(operatorType)
}
// NewConfigWithID creates a new UDP input config with default values
func NewConfigWithID(operatorID string) *Config {
return &Config{
InputConfig: helper.NewInputConfig(operatorID, operatorType),
BaseConfig: BaseConfig{
Encoding: "utf-8",
OneLogPerPacket: false,
Multiline: tokenize.MultilineConfig{
LineStartPattern: "",
LineEndPattern: ".^", // Use never matching regex to not split data by default
},
},
}
}
// Config is the configuration of a udp input operator.
type Config struct {
helper.InputConfig `mapstructure:",squash"`
BaseConfig `mapstructure:",squash"`
}
// BaseConfig is the details configuration of a udp input operator.
type BaseConfig struct {
ListenAddress string `mapstructure:"listen_address,omitempty"`
OneLogPerPacket bool `mapstructure:"one_log_per_packet,omitempty"`
AddAttributes bool `mapstructure:"add_attributes,omitempty"`
Encoding string `mapstructure:"encoding,omitempty"`
Multiline tokenize.MultilineConfig `mapstructure:"multiline,omitempty"`
PreserveLeadingWhitespaces bool `mapstructure:"preserve_leading_whitespaces,omitempty"`
PreserveTrailingWhitespaces bool `mapstructure:"preserve_trailing_whitespaces,omitempty"`
}
// Build will build a udp input operator.
func (c Config) Build(logger *zap.SugaredLogger) (operator.Operator, error) {
inputOperator, err := c.InputConfig.Build(logger)
if err != nil {
return nil, err
}
if c.ListenAddress == "" {
return nil, fmt.Errorf("missing required parameter 'listen_address'")
}
address, err := net.ResolveUDPAddr("udp", c.ListenAddress)
if err != nil {
return nil, fmt.Errorf("failed to resolve listen_address: %w", err)
}
enc, err := decoder.LookupEncoding(c.Encoding)
if err != nil {
return nil, err
}
// Build multiline
splitFunc, err := c.Multiline.Build(enc, true, c.PreserveLeadingWhitespaces, c.PreserveTrailingWhitespaces, MaxUDPSize)
if err != nil {
return nil, err
}
var resolver *helper.IPResolver
if c.AddAttributes {
resolver = helper.NewIPResolver()
}
udpInput := &Input{
InputOperator: inputOperator,
address: address,
buffer: make([]byte, MaxUDPSize),
addAttributes: c.AddAttributes,
encoding: enc,
splitFunc: splitFunc,
resolver: resolver,
OneLogPerPacket: c.OneLogPerPacket,
}
return udpInput, nil
}
// Input is an operator that listens to a socket for log entries.
type Input struct {
buffer []byte
helper.InputOperator
address *net.UDPAddr
addAttributes bool
OneLogPerPacket bool
connection net.PacketConn
cancel context.CancelFunc
wg sync.WaitGroup
encoding encoding.Encoding
splitFunc bufio.SplitFunc
resolver *helper.IPResolver
}
// Start will start listening for messages on a socket.
func (u *Input) Start(_ operator.Persister) error {
ctx, cancel := context.WithCancel(context.Background())
u.cancel = cancel
conn, err := net.ListenUDP("udp", u.address)
if err != nil {
return fmt.Errorf("failed to open connection: %w", err)
}
u.connection = conn
u.goHandleMessages(ctx)
return nil
}
// goHandleMessages will handle messages from a udp connection.
func (u *Input) goHandleMessages(ctx context.Context) {
u.wg.Add(1)
go func() {
defer u.wg.Done()
dec := decoder.New(u.encoding)
buf := make([]byte, 0, MaxUDPSize)
for {
message, remoteAddr, err := u.readMessage()
if err != nil {
select {
case <-ctx.Done():
return
default:
u.Errorw("Failed reading messages", zap.Error(err))
}
break
}
if u.OneLogPerPacket {
log := truncateMaxLog(message)
u.handleMessage(ctx, remoteAddr, dec, log)
continue
}
scanner := bufio.NewScanner(bytes.NewReader(message))
scanner.Buffer(buf, MaxUDPSize)
scanner.Split(u.splitFunc)
for scanner.Scan() {
u.handleMessage(ctx, remoteAddr, dec, scanner.Bytes())
}
if err := scanner.Err(); err != nil {
u.Errorw("Scanner error", zap.Error(err))
}
}
}()
}
func truncateMaxLog(data []byte) (token []byte) {
if len(data) >= MaxUDPSize {
return data[:MaxUDPSize]
}
if len(data) == 0 {
return nil
}
return data
}
func (u *Input) handleMessage(ctx context.Context, remoteAddr net.Addr, dec *decoder.Decoder, log []byte) {
decoded, err := dec.Decode(log)
if err != nil {
u.Errorw("Failed to decode data", zap.Error(err))
return
}
entry, err := u.NewEntry(string(decoded))
if err != nil {
u.Errorw("Failed to create entry", zap.Error(err))
return
}
if u.addAttributes {
entry.AddAttribute("net.transport", "IP.UDP")
if addr, ok := u.connection.LocalAddr().(*net.UDPAddr); ok {
ip := addr.IP.String()
entry.AddAttribute("net.host.ip", addr.IP.String())
entry.AddAttribute("net.host.port", strconv.FormatInt(int64(addr.Port), 10))
entry.AddAttribute("net.host.name", u.resolver.GetHostFromIP(ip))
}
if addr, ok := remoteAddr.(*net.UDPAddr); ok {
ip := addr.IP.String()
entry.AddAttribute("net.peer.ip", ip)
entry.AddAttribute("net.peer.port", strconv.FormatInt(int64(addr.Port), 10))
entry.AddAttribute("net.peer.name", u.resolver.GetHostFromIP(ip))
}
}
u.Write(ctx, entry)
}
// readMessage will read log messages from the connection.
func (u *Input) readMessage() ([]byte, net.Addr, error) {
n, addr, err := u.connection.ReadFrom(u.buffer)
if err != nil {
return nil, nil, err
}
// Remove trailing characters and NULs
for ; (n > 0) && (u.buffer[n-1] < 32); n-- { // nolint
}
return u.buffer[:n], addr, nil
}
// Stop will stop listening for udp messages.
func (u *Input) Stop() error {
if u.cancel == nil {
return nil
}
u.cancel()
if u.connection != nil {
if err := u.connection.Close(); err != nil {
u.Errorf("failed to close UDP connection: %s", err)
}
}
u.wg.Wait()
if u.resolver != nil {
u.resolver.Stop()
}
return nil
}