http_listener_v2

README

HTTP Listener v2 Input Plugin

HTTP Listener v2 is a service input plugin that listens for metrics sent via HTTP. Metrics may be sent in any supported data format. For metrics in InfluxDB Line Protocol it's recommended to use the influxdb_listener or influxdb_v2_listener instead.

Note: The plugin previously known as http_listener has been renamed influxdb_listener. If you would like Telegraf to act as a proxy/relay for InfluxDB it is recommended to use influxdb_listener or influxdb_v2_listener.

Service Input

This plugin is a service input. Normal plugins gather metrics determined by the interval setting. Service plugins start a service to listens and waits for metrics or events to occur. Service plugins have two key differences from normal plugins:

1. The global or plugin specific interval setting may not apply
2. The CLI options of --test, --test-wait, and --once may not produce output for this plugin

Global configuration options

In addition to the plugin-specific configuration settings, plugins support additional global and plugin configuration settings. These settings are used to modify metrics, tags, and field or create aliases and configure ordering, etc. See the CONFIGURATION.md for more details.

Configuration

# Generic HTTP write listener
[[inputs.http_listener_v2]]
  ## Address and port to host HTTP listener on
  service_address = ":8080"

  ## Paths to listen to.
  # paths = ["/telegraf"]

  ## Save path as http_listener_v2_path tag if set to true
  # path_tag = false

  ## HTTP methods to accept.
  # methods = ["POST", "PUT"]

  ## Optional HTTP headers
  ## These headers are applied to the server that is listening for HTTP
  ## requests and included in responses.
  # http_headers = {"HTTP_HEADER" = "TAG_NAME"}

  ## maximum duration before timing out read of the request
  # read_timeout = "10s"
  ## maximum duration before timing out write of the response
  # write_timeout = "10s"

  ## Maximum allowed http request body size in bytes.
  ## 0 means to use the default of 524,288,000 bytes (500 mebibytes)
  # max_body_size = "500MB"

  ## Part of the request to consume.  Available options are "body" and
  ## "query".
  # data_source = "body"

  ## Set one or more allowed client CA certificate file names to
  ## enable mutually authenticated TLS connections
  # tls_allowed_cacerts = ["/etc/telegraf/clientca.pem"]

  ## Add service certificate and key
  # tls_cert = "/etc/telegraf/cert.pem"
  # tls_key = "/etc/telegraf/key.pem"

  ## Minimal TLS version accepted by the server
  # tls_min_version = "TLS12"

  ## Optional username and password to accept for HTTP basic authentication.
  ## You probably want to make sure you have TLS configured above for this.
  # basic_username = "foobar"
  # basic_password = "barfoo"

  ## Optional setting to map http headers into tags
  ## If the http header is not present on the request, no corresponding tag will be added
  ## If multiple instances of the http header are present, only the first value will be used
  # http_header_tags = {"HTTP_HEADER" = "TAG_NAME"}

  ## Data format to consume.
  ## Each data format has its own unique set of configuration options, read
  ## more about them here:
  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
  data_format = "influx"

Metrics

Metrics are collected from the part of the request specified by the data_source param and are parsed depending on the value of data_format.

Example Output

Troubleshooting

Send Line Protocol:

curl -i -XPOST 'http://localhost:8080/telegraf' --data-binary 'cpu_load_short,host=server01,region=us-west value=0.64 1434055562000000000'

Send JSON:

curl -i -XPOST 'http://localhost:8080/telegraf' --data-binary '{"value1": 42, "value2": 42}'

Send query params:

curl -i -XGET 'http://localhost:8080/telegraf?host=server01&value=0.42'

Documentation

Index

• type HTTPListenerV2
  • func (h *HTTPListenerV2) Gather(_ telegraf.Accumulator) error
  • func (h *HTTPListenerV2) Init() error
  • func (*HTTPListenerV2) SampleConfig() string
  • func (h *HTTPListenerV2) ServeHTTP(res http.ResponseWriter, req *http.Request)
  • func (h *HTTPListenerV2) SetParser(parser telegraf.Parser)
  • func (h *HTTPListenerV2) Start(acc telegraf.Accumulator) error
  • func (h *HTTPListenerV2) Stop()
• type TimeFunc

Types

type HTTPListenerV2

type HTTPListenerV2 struct {
	ServiceAddress string            `toml:"service_address"`
	Path           string            `toml:"path" deprecated:"1.20.0;use 'paths' instead"`
	Paths          []string          `toml:"paths"`
	PathTag        bool              `toml:"path_tag"`
	Methods        []string          `toml:"methods"`
	HTTPHeaders    map[string]string `toml:"http_headers"`
	DataSource     string            `toml:"data_source"`
	ReadTimeout    config.Duration   `toml:"read_timeout"`
	WriteTimeout   config.Duration   `toml:"write_timeout"`
	MaxBodySize    config.Size       `toml:"max_body_size"`
	Port           int               `toml:"port"`
	BasicUsername  string            `toml:"basic_username"`
	BasicPassword  string            `toml:"basic_password"`
	HTTPHeaderTags map[string]string `toml:"http_header_tags"`

	tlsint.ServerConfig

	TimeFunc
	Log telegraf.Logger

	telegraf.Parser
	// contains filtered or unexported fields
}

HTTPListenerV2 is an input plugin that collects external metrics sent via HTTP

func (*HTTPListenerV2) Gather

func (h *HTTPListenerV2) Gather(_ telegraf.Accumulator) error

func (*HTTPListenerV2) Init

func (h *HTTPListenerV2) Init() error

func (*HTTPListenerV2) SampleConfig

func (*HTTPListenerV2) SampleConfig() string

func (*HTTPListenerV2) ServeHTTP

func (h *HTTPListenerV2) ServeHTTP(res http.ResponseWriter, req *http.Request)

func (*HTTPListenerV2) SetParser

func (h *HTTPListenerV2) SetParser(parser telegraf.Parser)

func (*HTTPListenerV2) Start

func (h *HTTPListenerV2) Start(acc telegraf.Accumulator) error

Start starts the http listener service.

func (*HTTPListenerV2) Stop

func (h *HTTPListenerV2) Stop()

Stop cleans up all resources

type TimeFunc

type TimeFunc func() time.Time

TimeFunc provides a timestamp for the metrics