defaultforwarder

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Published: Apr 3, 2024 License: Apache-2.0 Imports: 33 Imported by: 3

README

package forwarder

This package is responsible for sending payloads to the backend. Payloads can come from different sources in different formats, the forwarder will not inspect them.

The forwarder can receive multiple domains with a list of API keys for each of them. Every payload will be sent to every domain/API keys couple, this became a Transaction. Transactions will be retried on error. The newest transactions will be retried first. Transactions are consumed by Workers asynchronously.

Usage


KeysPerDomains := map[string][]string{
	"http://api.datadog.com": {"my_secret_key_1", "my_secret_key_2"},
	"http://debug.api.com":   {"secret_api"},
}

forwarder := forwarder.NewForwarder(KeysPerDomains)
forwarder.NumberOfWorkers = 1 // default: config.GetInt("forwarder_num_workers")
forwarder.Start()

// ...

payload1 := []byte("some payload")
payload2 := []byte("another payload")
forwarder.SubmitSeries(Payloads{&payload1, &payload2}, ...)

// ...

forwarder.Stop()

Configuration

There are several settings that influence the behavior of the forwarder.

Exponential backoff and circuit breaker settings
  • forwarder_backoff_factor - This controls the overlap between consecutive retry interval ranges. When set to 2, there is a guarantee that there will be no overlap. The overlap will asymptotically approach 50% the higher the value is set. Values less then 2 are verboten as there will be range gaps. Default: 2
  • forwarder_backoff_base - This controls the rate of exponential growth. Also, you can calculate the start of the very first retry interval range by evaluating the following expression: forwarder_backoff_base / forwarder_backoff_factor * 2. Default: 2
  • forwarder_backoff_max - This is the maximum number of seconds to wait for a retry. Default: 64
  • forwarder_recovery_interval - This controls how many retry interval ranges to step down for an endpoint upon success. Default: 2
  • forwarder_recovery_reset - Whether or not a successful request should completely clear an endpoint's error count. Default: false

Internal

The forwarder is composed of multiple parts:

DefaultForwarder

DefaultForwarder it the default implementation of the Forwarder interface (and the only one for now). This class is in charge of receiving payloads, creating the HTTP transactions and distributing them among every domainForwarder.

domainForwarder

The agent can be configured to send the same payload to multiple destinations. Each destination (or domain) can be configured with 1 or more API keys. Every payload will be sent to each domain/API key pair.

A domainForwarder is in charge of sending payloads to one domain. This avoids slowing down every domain when one is down/slow. Each domainForwarder will have a number of dedicated Worker to process Transaction. We process new transactions first and then (when the workers have time) we retry the erroneous ones (newest transactions are retried first).

We start dropping transactions (oldest first) when the sum of all the payload sizes is bigger than forwarder_retry_queue_payloads_max_size (see the agent configuration).

Disclaimer: using multiple API keys with the Datadog backend will multiply your billing ! Most customers will only use one API key.

Worker

A Worker processes transactions coming from 2 queues: HighPrio and LowPrio. New transactions are sent to the HighPrio queue and the ones to retry are sent to LowPrio. A Worker is dedicated to on domain (ie: domainForwarder).

blockedEndpoints (or exponential backoff)

When a transaction fails to be sent to a backend we blacklist that particular endpoints for some time to avoid flooding an unavailable endpoint (the transactions will be retried later). A blacklist is specific to one endpoint on one domain (ie: "http(s):///"). The blacklist time will grow, up to a maximum, as more and more errors are encountered for that endpoint and is gradually cleared when a transaction is successful. The blacklist is shared by all workers.

Transaction

A HTTPTransaction contains every information about a payload and how/where to send it. On failure a transaction will be retried later (see blockedEndpoints).

Documentation

Overview

Package defaultforwarder implements a component to send payloads to the backend

Index

Constants

View Source
const (
	// Stopped represent the internal state of an unstarted Forwarder.
	Stopped uint32 = iota
	// Started represent the internal state of an started Forwarder.
	Started
	// Disabled represent the internal state of a disabled Forwarder.
	Disabled
)

Variables

This section is empty.

Functions

func HasFeature

func HasFeature(features, flag Features) bool

HasFeature lets you know if a specific feature flag is set in a feature set

func MockModule

func MockModule() fxutil.Module

MockModule defines the fx options for the mock component.

func Module

func Module() fxutil.Module

Module defines the fx options for this component.

func NewForwarder

func NewForwarder(config config.Component, log log.Component, params Params) provides

NewForwarder returns a new forwarder component.

func NewHTTPClient

func NewHTTPClient(config config.Component) *http.Client

NewHTTPClient creates a new http.Client

Types

type Component

type Component interface {
	// TODO: (components) When the code of the forwarder will be
	// in /comp/forwarder move the content of forwarder.Forwarder inside this interface.
	Forwarder
}

Component is the component type.

type DefaultForwarder

type DefaultForwarder struct {

	// NumberOfWorkers Number of concurrent HTTP request made by the DefaultForwarder (default 4).
	NumberOfWorkers int
	// contains filtered or unexported fields
}

DefaultForwarder is the default implementation of the Forwarder.

func NewDefaultForwarder

func NewDefaultForwarder(config config.Component, log log.Component, options *Options) *DefaultForwarder

NewDefaultForwarder returns a new DefaultForwarder. TODO: (components) Remove this method and other exported methods in comp/forwarder.

func (*DefaultForwarder) Start

func (f *DefaultForwarder) Start() error

Start initialize and runs the forwarder.

func (*DefaultForwarder) State

func (f *DefaultForwarder) State() uint32

State returns the internal state of the forwarder (Started or Stopped)

func (*DefaultForwarder) Stop

func (f *DefaultForwarder) Stop()

Stop all the component of a forwarder and free resources

func (*DefaultForwarder) SubmitAgentChecksMetadata

func (f *DefaultForwarder) SubmitAgentChecksMetadata(payload transaction.BytesPayloads, extra http.Header) error

SubmitAgentChecksMetadata will send a agentchecks_metadata tag type payload to Datadog backend.

func (*DefaultForwarder) SubmitConnectionChecks

func (f *DefaultForwarder) SubmitConnectionChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitConnectionChecks sends connection checks

func (*DefaultForwarder) SubmitContainerChecks

func (f *DefaultForwarder) SubmitContainerChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitContainerChecks sends container checks

func (*DefaultForwarder) SubmitHostMetadata

func (f *DefaultForwarder) SubmitHostMetadata(payload transaction.BytesPayloads, extra http.Header) error

SubmitHostMetadata will send a host_metadata tag type payload to Datadog backend.

func (*DefaultForwarder) SubmitMetadata

func (f *DefaultForwarder) SubmitMetadata(payload transaction.BytesPayloads, extra http.Header) error

SubmitMetadata will send a metadata type payload to Datadog backend.

func (*DefaultForwarder) SubmitOrchestratorChecks

func (f *DefaultForwarder) SubmitOrchestratorChecks(payload transaction.BytesPayloads, extra http.Header, payloadType int) (chan Response, error)

SubmitOrchestratorChecks sends orchestrator checks

func (*DefaultForwarder) SubmitOrchestratorManifests

func (f *DefaultForwarder) SubmitOrchestratorManifests(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitOrchestratorManifests sends orchestrator manifests

func (*DefaultForwarder) SubmitProcessChecks

func (f *DefaultForwarder) SubmitProcessChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitProcessChecks sends process checks

func (*DefaultForwarder) SubmitProcessDiscoveryChecks

func (f *DefaultForwarder) SubmitProcessDiscoveryChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitProcessDiscoveryChecks sends process discovery checks

func (*DefaultForwarder) SubmitProcessEventChecks

func (f *DefaultForwarder) SubmitProcessEventChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitProcessEventChecks sends process events checks

func (*DefaultForwarder) SubmitRTContainerChecks

func (f *DefaultForwarder) SubmitRTContainerChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitRTContainerChecks sends real time container checks

func (*DefaultForwarder) SubmitRTProcessChecks

func (f *DefaultForwarder) SubmitRTProcessChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitRTProcessChecks sends real time process checks

func (*DefaultForwarder) SubmitSeries

func (f *DefaultForwarder) SubmitSeries(payloads transaction.BytesPayloads, extra http.Header) error

SubmitSeries will send timeseries to the v2 endpoint

func (*DefaultForwarder) SubmitSketchSeries

func (f *DefaultForwarder) SubmitSketchSeries(payload transaction.BytesPayloads, extra http.Header) error

SubmitSketchSeries will send payloads to Datadog backend - PROTOTYPE FOR PERCENTILE

func (*DefaultForwarder) SubmitV1CheckRuns

func (f *DefaultForwarder) SubmitV1CheckRuns(payload transaction.BytesPayloads, extra http.Header) error

SubmitV1CheckRuns will send service checks to v1 endpoint (this will be removed once the backend handles v2 endpoints).

func (*DefaultForwarder) SubmitV1Intake

func (f *DefaultForwarder) SubmitV1Intake(payload transaction.BytesPayloads, kind transaction.Kind, extra http.Header) error

SubmitV1Intake will send payloads to the universal `/intake/` endpoint used by Agent v.5

func (*DefaultForwarder) SubmitV1Series

func (f *DefaultForwarder) SubmitV1Series(payloads transaction.BytesPayloads, extra http.Header) error

SubmitV1Series will send timeserie to v1 endpoint (this will be remove once the backend handles v2 endpoints).

type Features

type Features uint8

Features is a bitmask to enable specific forwarder features

const (
	// CoreFeatures bitmask to enable specific core features
	CoreFeatures Features = 1 << iota
	// TraceFeatures bitmask to enable specific trace features
	TraceFeatures
	// ProcessFeatures bitmask to enable specific process features
	ProcessFeatures
	// SysProbeFeatures bitmask to enable specific system-probe features
	SysProbeFeatures
)

func ClearFeature

func ClearFeature(features, flag Features) Features

ClearFeature clears forwarder features from a feature set

func SetFeature

func SetFeature(features, flag Features) Features

SetFeature sets forwarder features in a feature set

func ToggleFeature

func ToggleFeature(features, flag Features) Features

ToggleFeature toggles forwarder features in a feature set

type Forwarder

type Forwarder interface {
	Start() error
	Stop()
	SubmitV1Series(payload transaction.BytesPayloads, extra http.Header) error
	SubmitV1Intake(payload transaction.BytesPayloads, kind transaction.Kind, extra http.Header) error
	SubmitV1CheckRuns(payload transaction.BytesPayloads, extra http.Header) error
	SubmitSeries(payload transaction.BytesPayloads, extra http.Header) error
	SubmitSketchSeries(payload transaction.BytesPayloads, extra http.Header) error
	SubmitHostMetadata(payload transaction.BytesPayloads, extra http.Header) error
	SubmitAgentChecksMetadata(payload transaction.BytesPayloads, extra http.Header) error
	SubmitMetadata(payload transaction.BytesPayloads, extra http.Header) error
	SubmitProcessChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)
	SubmitProcessDiscoveryChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)
	SubmitProcessEventChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)
	SubmitRTProcessChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)
	SubmitContainerChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)
	SubmitRTContainerChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)
	SubmitConnectionChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)
	SubmitOrchestratorChecks(payload transaction.BytesPayloads, extra http.Header, payloadType int) (chan Response, error)
	SubmitOrchestratorManifests(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)
}

Forwarder interface allows packages to send payload to the backend

type Mock

type Mock interface {
	Component
}

Mock implements mock-specific methods.

type NoopForwarder

type NoopForwarder struct{}

NoopForwarder is a Forwarder doing nothing and not returning any responses.

func (NoopForwarder) Start

func (f NoopForwarder) Start() error

Start does nothing.

func (NoopForwarder) Stop

func (f NoopForwarder) Stop()

Stop does nothing.

func (NoopForwarder) SubmitAgentChecksMetadata

func (f NoopForwarder) SubmitAgentChecksMetadata(_ transaction.BytesPayloads, _ http.Header) error

SubmitAgentChecksMetadata does nothing.

func (NoopForwarder) SubmitConnectionChecks

func (f NoopForwarder) SubmitConnectionChecks(_ transaction.BytesPayloads, _ http.Header) (chan Response, error)

SubmitConnectionChecks does nothing.

func (NoopForwarder) SubmitContainerChecks

func (f NoopForwarder) SubmitContainerChecks(_ transaction.BytesPayloads, _ http.Header) (chan Response, error)

SubmitContainerChecks does nothing.

func (NoopForwarder) SubmitHostMetadata

func (f NoopForwarder) SubmitHostMetadata(_ transaction.BytesPayloads, _ http.Header) error

SubmitHostMetadata does nothing.

func (NoopForwarder) SubmitMetadata

func (f NoopForwarder) SubmitMetadata(_ transaction.BytesPayloads, _ http.Header) error

SubmitMetadata does nothing.

func (NoopForwarder) SubmitOrchestratorChecks

func (f NoopForwarder) SubmitOrchestratorChecks(_ transaction.BytesPayloads, _ http.Header, _ int) (chan Response, error)

SubmitOrchestratorChecks does nothing.

func (NoopForwarder) SubmitOrchestratorManifests

func (f NoopForwarder) SubmitOrchestratorManifests(_ transaction.BytesPayloads, _ http.Header) (chan Response, error)

SubmitOrchestratorManifests does nothing.

func (NoopForwarder) SubmitProcessChecks

func (f NoopForwarder) SubmitProcessChecks(_ transaction.BytesPayloads, _ http.Header) (chan Response, error)

SubmitProcessChecks does nothing.

func (NoopForwarder) SubmitProcessDiscoveryChecks

func (f NoopForwarder) SubmitProcessDiscoveryChecks(_ transaction.BytesPayloads, _ http.Header) (chan Response, error)

SubmitProcessDiscoveryChecks does nothing.

func (NoopForwarder) SubmitProcessEventChecks

func (f NoopForwarder) SubmitProcessEventChecks(_ transaction.BytesPayloads, _ http.Header) (chan Response, error)

SubmitProcessEventChecks does nothing

func (NoopForwarder) SubmitRTContainerChecks

func (f NoopForwarder) SubmitRTContainerChecks(_ transaction.BytesPayloads, _ http.Header) (chan Response, error)

SubmitRTContainerChecks does nothing.

func (NoopForwarder) SubmitRTProcessChecks

func (f NoopForwarder) SubmitRTProcessChecks(_ transaction.BytesPayloads, _ http.Header) (chan Response, error)

SubmitRTProcessChecks does nothing.

func (NoopForwarder) SubmitSeries

func (f NoopForwarder) SubmitSeries(_ transaction.BytesPayloads, _ http.Header) error

SubmitSeries does nothing.

func (NoopForwarder) SubmitSketchSeries

func (f NoopForwarder) SubmitSketchSeries(_ transaction.BytesPayloads, _ http.Header) error

SubmitSketchSeries does nothing.

func (NoopForwarder) SubmitV1CheckRuns

func (f NoopForwarder) SubmitV1CheckRuns(_ transaction.BytesPayloads, _ http.Header) error

SubmitV1CheckRuns does nothing.

func (NoopForwarder) SubmitV1Intake

SubmitV1Intake does nothing.

func (NoopForwarder) SubmitV1Series

func (f NoopForwarder) SubmitV1Series(_ transaction.BytesPayloads, _ http.Header) error

SubmitV1Series does nothing.

type Options

type Options struct {
	NumberOfWorkers                int
	RetryQueuePayloadsTotalMaxSize int
	DisableAPIKeyChecking          bool
	EnabledFeatures                Features
	APIKeyValidationInterval       time.Duration
	DomainResolvers                map[string]resolver.DomainResolver
	ConnectionResetInterval        time.Duration
	CompletionHandler              transaction.HTTPCompletionHandler
}

Options contain the configuration options for the DefaultForwarder

func NewOptions

func NewOptions(config config.Component, log log.Component, keysPerDomain map[string][]string) *Options

NewOptions creates new Options with default values

func NewOptionsWithResolvers

func NewOptionsWithResolvers(config config.Component, log log.Component, domainResolvers map[string]resolver.DomainResolver) *Options

NewOptionsWithResolvers creates new Options with default values

type Params

type Params struct {
	UseNoopForwarder bool
	// TODO: (components) When the code of the forwarder will be
	// in /comp/forwarder move the content of forwarder.Options inside this struct.
	Options *Options
}

Params contains the parameters to create a forwarder.

func NewParams

func NewParams(config config.Component, log log.Component) Params

NewParams initializes a new Params struct

func NewParamsWithResolvers

func NewParamsWithResolvers(config config.Component, log log.Component) Params

NewParamsWithResolvers initializes a new Params struct with resolvers

type PointSuccessfullySent

type PointSuccessfullySent interface {
	OnPointSuccessfullySent(int)
}

PointSuccessfullySent is called when sending successfully a point to the intake.

type Response

type Response struct {
	Domain     string
	Body       []byte
	StatusCode int
	Err        error
}

Response contains the response details of a successfully posted transaction

type SyncForwarder

type SyncForwarder struct {
	// contains filtered or unexported fields
}

SyncForwarder is a very simple Forwarder synchronously sending the data to the intake.

func NewSyncForwarder

func NewSyncForwarder(config config.Component, log log.Component, keysPerDomain map[string][]string, timeout time.Duration) *SyncForwarder

NewSyncForwarder returns a new synchronous forwarder.

func (*SyncForwarder) Start

func (f *SyncForwarder) Start() error

Start starts the sync forwarder: nothing to do.

func (*SyncForwarder) Stop

func (f *SyncForwarder) Stop()

Stop stops the sync forwarder: nothing to do.

func (*SyncForwarder) SubmitAgentChecksMetadata

func (f *SyncForwarder) SubmitAgentChecksMetadata(payload transaction.BytesPayloads, extra http.Header) error

SubmitAgentChecksMetadata will send a agentchecks_metadata tag type payload to Datadog backend.

func (*SyncForwarder) SubmitConnectionChecks

func (f *SyncForwarder) SubmitConnectionChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitConnectionChecks sends connection checks

func (*SyncForwarder) SubmitContainerChecks

func (f *SyncForwarder) SubmitContainerChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitContainerChecks sends container checks

func (*SyncForwarder) SubmitHostMetadata

func (f *SyncForwarder) SubmitHostMetadata(payload transaction.BytesPayloads, extra http.Header) error

SubmitHostMetadata will send a host_metadata tag type payload to Datadog backend.

func (*SyncForwarder) SubmitMetadata

func (f *SyncForwarder) SubmitMetadata(payload transaction.BytesPayloads, extra http.Header) error

SubmitMetadata will send a metadata type payload to Datadog backend.

func (*SyncForwarder) SubmitOrchestratorChecks

func (f *SyncForwarder) SubmitOrchestratorChecks(payload transaction.BytesPayloads, extra http.Header, payloadType int) (chan Response, error)

SubmitOrchestratorChecks sends orchestrator checks

func (*SyncForwarder) SubmitOrchestratorManifests

func (f *SyncForwarder) SubmitOrchestratorManifests(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitOrchestratorManifests sends orchestrator manifests

func (*SyncForwarder) SubmitProcessChecks

func (f *SyncForwarder) SubmitProcessChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitProcessChecks sends process checks

func (*SyncForwarder) SubmitProcessDiscoveryChecks

func (f *SyncForwarder) SubmitProcessDiscoveryChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitProcessDiscoveryChecks sends process discovery checks

func (*SyncForwarder) SubmitProcessEventChecks

func (f *SyncForwarder) SubmitProcessEventChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitProcessEventChecks sends process events checks

func (*SyncForwarder) SubmitRTContainerChecks

func (f *SyncForwarder) SubmitRTContainerChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitRTContainerChecks sends real time container checks

func (*SyncForwarder) SubmitRTProcessChecks

func (f *SyncForwarder) SubmitRTProcessChecks(payload transaction.BytesPayloads, extra http.Header) (chan Response, error)

SubmitRTProcessChecks sends real time process checks

func (*SyncForwarder) SubmitSeries

func (f *SyncForwarder) SubmitSeries(payload transaction.BytesPayloads, extra http.Header) error

SubmitSeries will send timeseries to the v2 endpoint

func (*SyncForwarder) SubmitSketchSeries

func (f *SyncForwarder) SubmitSketchSeries(payload transaction.BytesPayloads, extra http.Header) error

SubmitSketchSeries will send payloads to Datadog backend - PROTOTYPE FOR PERCENTILE

func (*SyncForwarder) SubmitV1CheckRuns

func (f *SyncForwarder) SubmitV1CheckRuns(payload transaction.BytesPayloads, extra http.Header) error

SubmitV1CheckRuns will send service checks to v1 endpoint (this will be removed once the backend handles v2 endpoints).

func (*SyncForwarder) SubmitV1Intake

func (f *SyncForwarder) SubmitV1Intake(payload transaction.BytesPayloads, kind transaction.Kind, extra http.Header) error

SubmitV1Intake will send payloads to the universal `/intake/` endpoint used by Agent v.5

func (*SyncForwarder) SubmitV1Series

func (f *SyncForwarder) SubmitV1Series(payload transaction.BytesPayloads, extra http.Header) error

SubmitV1Series will send timeserie to v1 endpoint (this will be remove once the backend handles v2 endpoints).

type Worker

type Worker struct {

	// Client the http client used to processed transactions.
	Client *http.Client
	// HighPrio is the channel used to receive high priority transaction from the Forwarder.
	HighPrio <-chan transaction.Transaction
	// LowPrio is the channel used to receive low priority transaction from the Forwarder.
	LowPrio <-chan transaction.Transaction
	// RequeueChan is the channel used to send failed transaction back to the Forwarder.
	RequeueChan chan<- transaction.Transaction
	// contains filtered or unexported fields
}

Worker consumes Transaction (aka transactions) from the Forwarder and processes them. If the transaction fails to be processed the Worker will send it back to the Forwarder to be retried later.

func NewWorker

func NewWorker(
	config config.Component,
	log log.Component,
	highPrioChan <-chan transaction.Transaction,
	lowPrioChan <-chan transaction.Transaction,
	requeueChan chan<- transaction.Transaction,
	blocked *blockedEndpoints,
	pointSuccessfullySent PointSuccessfullySent,
) *Worker

NewWorker returns a new worker to consume Transaction from inputChan and push back erroneous ones into requeueChan.

func (*Worker) ScheduleConnectionReset

func (w *Worker) ScheduleConnectionReset()

ScheduleConnectionReset allows signaling the worker that all connections should be recreated before sending the next transaction. Returns immediately.

func (*Worker) Start

func (w *Worker) Start()

Start starts a Worker.

func (*Worker) Stop

func (w *Worker) Stop(purgeHighPrio bool)

Stop stops the worker.

Directories

Path Synopsis
Package endpoints stores a collection of `transaction.Endpoint` mainly used by the forwarder package to send data to Datadog using the right request path for a given type of data.
Package endpoints stores a collection of `transaction.Endpoint` mainly used by the forwarder package to send data to Datadog using the right request path for a given type of data.
internal
retry
Package retry provides retry mechanisms for the forwarder.
Package retry provides retry mechanisms for the forwarder.
Package resolver contains logic to perform per `transaction.Endpoint` domain resolution.
Package resolver contains logic to perform per `transaction.Endpoint` domain resolution.
Package transaction defines the transaction of the forwarder
Package transaction defines the transaction of the forwarder

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