HTTP

Fluvio HTTP Inbound Connector

Read HTTP Responses given input HTTP request configuration options and produce them to Fluvio topics.

This connector can be configured to operate in three modes.

Polling: Unless otherwise specified, the endpoint will be polled periodically, with the polling interval specified by providing the interval config option. Each response will be produced as an individual Fluvio record.
Streaming: When the stream config option is provided, the HTTP response will be processed as a data stream. A record will be produced to Fluvio every time a delimiter segment is encountered, which is set to \n by default.
WebSocket: When the provided endpoint config option is prefixed with ws://, a WebSocket connection will be established, and each incoming message will be produced.

Supports HTTP/1.0, HTTP/1.1, HTTP/2.0 protocols.

See docs here. Tutorial for HTTP to SQL Pipeline.

Configuration

Option	default	type	description
interval	10s	String	Interval between each HTTP Request. This is in the form of “1s”, “10ms”, “1m”, “1ns”, etc.
method	GET	String	GET, POST, PUT, HEAD
endpoint	-	String	HTTP URL endpoint. Use `ws://` for websocket URLs.
headers	-	Array<String>	Request header(s) “Key:Value” pairs
body	-	String	Request body e.g. in POST
user-agent	“fluvio/http-source 0.1.0”	String	Request user-agent
output_type	text	String	`text` = UTF-8 String Output, `json` = UTF-8 JSON Serialized String
output_parts	body	String	`body` = body only, `full` = all status, header and body parts
stream	false	bool	Flag to indicate HTTP streaming mode
delimiter	‘\n’	String	Delimiter to separate records when producing from an HTTP streaming endpoint
websocket_config	{}	Object	WebSocket configuration object. See below.

Record Type Output

Matrix	Output
output_type = text (default), output_parts = body (default)	Only the body of the HTTP Response
output_type = text (default), output_parts = full	The full HTTP Response
output_type = json, output_parts = body (default)	Only the “body” in JSON struct
output_type = json, output_parts = full	HTTP “status”, “body” and “header” JSON

WebSocket Configuration

Option	default	type	description
subscription_messages	[]	Array<String>	List of messages to send to the server after connection is established.
ping_interval_ms	10000	int	Interval in milliseconds to send ping messages to the server.
subscription_message	-	String	(deprecated) Message to send to the server after connection is established. If provided with subscription_messages, subscription_message will be sent first.

Usage Example

This is an example of simple connector config file for polling an endpoint:

# config-example.yaml
apiVersion: 0.1.0
meta:
  version: 0.4.3
  name: cat-facts
  type: http-source
  topic: cat-facts
  create-topic: true
  secrets:
    - name: AUTHORIZATION_TOKEN
http:
  endpoint: "https://catfact.ninja/fact"
  interval: 10s
  headers:
    - "Authorization: token ${{ secrets.AUTHORIZATION_TOKEN }}"
    - "Cache-Control: no-cache"

The produced record in Fluvio topic will be:

{
  "fact": "The biggest wildcat today is the Siberian Tiger. It can be more than 12 feet (3.6 m) long (about the size of a small car) and weigh up to 700 pounds (317 kg).",
  "length": 158
}

Secrets

Fluvio HTTP Source Connector supports Secrets in the endpoint and in the headers parameters:

# config-example.yaml
apiVersion: 0.1.0
meta:
  version: 0.4.3
  name: cat-facts
  type: http-source
  topic: cat-facts
  create-topic: true
  secrets:
    - name: MY_SECRET_URL
    - name: MY_AUTHORIZATION_HEADER
http:
 endpoint:
   secret:
     name: MY_SECRET_URL
 headers:
  - "Authorization: ${{ secrets.MY_AUTHORIZATION_HEADER }}
 interval: 10s

Transformations

Fluvio HTTP Source Connector supports Transformations. Records can be modified before sending to Fluvio topic.

The previous example can be extended to add extra transformations to outgoing records:

# config-example.yaml
apiVersion: 0.1.0
meta:
  version: 0.4.3
  name: cat-facts
  type: http-source
  topic: cat-facts
  create-topic: true
http:
  endpoint: "https://catfact.ninja/fact"
  interval: 10s
transforms:
  - uses: infinyon/jolt@0.1.0
    with:
      spec:
        - operation: default
          spec:
            source: "http-connector"
        - operation: remove
          spec:
            length: ""

In this case, additional transformation will be performed before records are sent to Fluvio topic: field length will be removed and field source with string value http-connector will be added.

Now produced records will have a different shape, for example:

{
  "fact": "A cat has more bones than a human; humans have 206, and the cat - 230.",
  "source": "http-connector"
}

Read more about JSON to JSON transformations.

Streaming Mode

Provide the stream configuration option to enable streaming mode with delimiter to determine how the incoming records are separated.

# config-example.yaml
apiVersion: 0.1.0
meta:
  version: 0.4.3
  name: wiki-updates
  type: http-source
  topic: wiki-updates
http:
  endpoint: "https://stream.wikimedia.org/v2/stream/recentchange"
  method: GET
  stream: true
  delimiter: "\n\n"

Websocket Mode

Connect to a websocket endpoint using a ws:// URL. When reading text messages, they are emitted as equivalent records. Binary messages are initially attempted to be converted into strings.

# config-example.yaml
apiVersion: 0.1.0
meta:
  version: 0.4.3
  name: websocket-connector
  type: http-source
  topic: websocket-updates
http:
  endpoint: ws://websocket.example/websocket

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