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Wombat

redis_streams

Pulls messages from Redis (v5.0+) streams with the XREADGROUP command. The client_id should be unique for each consumer of a group.

# Common config fields, showing default values
input:
  label: ""
  redis_streams:
    url: redis://:6379 # No default (required)
    body_key: body
    streams: [] # No default (required)
    auto_replay_nacks: true
    limit: 10
    client_id: ""
    consumer_group: ""

Redis stream entries are key/value pairs, as such it is necessary to specify the key that contains the body of the message. All other keys/value pairs are saved as metadata fields.

Fields

url

The URL of the target Redis server. Database is optional and is supplied as the URL path.

Type: string

# Examples


url: redis://:6379


url: redis://localhost:6379


url: redis://foousername:foopassword@redisplace:6379


url: redis://:foopassword@redisplace:6379


url: redis://localhost:6379/1


url: redis://localhost:6379/1,redis://localhost:6380/1

kind

Specifies a simple, cluster-aware, or failover-aware redis client.

Type: string

Default: "simple"

Options: simple , cluster , failover .

master

Name of the redis master when kind is failover

Type: string

Default: ""

# Examples


master: mymaster

tls

Custom TLS settings can be used to override system defaults.

Troubleshooting

Some cloud hosted instances of Redis (such as Azure Cache) might need some hand holding in order to establish stable connections. Unfortunately, it is often the case that TLS issues will manifest as generic error messages such as “i/o timeout”. If you’re using TLS and are seeing connectivity problems consider setting enable_renegotiation to true, and ensuring that the server supports at least TLS version 1.2.

Type: object

tls.enabled

Whether custom TLS settings are enabled.

Type: bool

Default: false

tls.skip_cert_verify

Whether to skip server side certificate verification.

Type: bool

Default: false

tls.enable_renegotiation

Whether to allow the remote server to repeatedly request renegotiation. Enable this option if you’re seeing the error message local error: tls: no renegotiation.

Type: bool

Default: false Requires version 3.45.0 or newer

tls.root_cas

An optional root certificate authority to use. This is a string, representing a certificate chain from the parent trusted root certificate, to possible intermediate signing certificates, to the host certificate.

Type: string

Default: ""

# Examples


root_cas: |-
  -----BEGIN CERTIFICATE-----
  ...
  -----END CERTIFICATE-----

tls.root_cas_file

An optional path of a root certificate authority file to use. This is a file, often with a .pem extension, containing a certificate chain from the parent trusted root certificate, to possible intermediate signing certificates, to the host certificate.

Type: string

Default: ""

# Examples


root_cas_file: ./root_cas.pem

tls.client_certs

A list of client certificates to use. For each certificate either the fields cert and key, or cert_file and key_file should be specified, but not both.

Type: array

Default: []

# Examples


client_certs:
  - cert: foo
    key: bar


client_certs:
  - cert_file: ./example.pem
    key_file: ./example.key

tls.client_certs[].cert

A plain text certificate to use.

Type: string

Default: ""

tls.client_certs[].key

A plain text certificate key to use.

Type: string

Default: ""

tls.client_certs[].cert_file

The path of a certificate to use.

Type: string

Default: ""

tls.client_certs[].key_file

The path of a certificate key to use.

Type: string

Default: ""

tls.client_certs[].password

A plain text password for when the private key is password encrypted in PKCS#1 or PKCS#8 format. The obsolete pbeWithMD5AndDES-CBC algorithm is not supported for the PKCS#8 format.

Because the obsolete pbeWithMD5AndDES-CBC algorithm does not authenticate the ciphertext, it is vulnerable to padding oracle attacks that can let an attacker recover the plaintext.

Type: string

Default: ""

# Examples


password: foo


password: ${KEY_PASSWORD}

body_key

The field key to extract the raw message from. All other keys will be stored in the message as metadata.

Type: string

Default: "body"

streams

A list of streams to consume from.

Type: array

auto_replay_nacks

Whether messages that are rejected (nacked) at the output level should be automatically replayed indefinitely, eventually resulting in back pressure if the cause of the rejections is persistent. If set to false these messages will instead be deleted. Disabling auto replays can greatly improve memory efficiency of high throughput streams as the original shape of the data can be discarded immediately upon consumption and mutation.

Type: bool

Default: true

limit

The maximum number of messages to consume from a single request.

Type: int

Default: 10

client_id

An identifier for the client connection.

Type: string

Default: ""

consumer_group

An identifier for the consumer group of the stream.

Type: string

Default: ""

create_streams

Create subscribed streams if they do not exist (MKSTREAM option).

Type: bool

Default: true

start_from_oldest

If an offset is not found for a stream, determines whether to consume from the oldest available offset, otherwise messages are consumed from the latest offset.

Type: bool

Default: true

commit_period

The period of time between each commit of the current offset. Offsets are always committed during shutdown.

Type: string

Default: "1s"

timeout

The length of time to poll for new messages before reattempting.

Type: string

Default: "1s"