nats_jetstream
EXPERIMENTAL
This component is experimental and therefore subject to change or removal outside of major version releases.
Reads messages from NATS JetStream subjects.
Introduced in version 3.46.0.
- Common
- Advanced
# Common config fields, showing default valuesinput:label: ""nats_jetstream:urls:- nats://127.0.0.1:4222queue: ""subject: ""durable: ""deliver: all
# All config fields, showing default valuesinput:label: ""nats_jetstream:urls:- nats://127.0.0.1:4222queue: ""subject: ""durable: ""deliver: allack_wait: 30smax_ack_pending: 1024tls:enabled: falseskip_cert_verify: falseenable_renegotiation: falseroot_cas: ""root_cas_file: ""client_certs: []auth:nkey_file: ""user_credentials_file: ""
Metadata​
This input adds the following metadata fields to each message:
- nats_subject
You can access these metadata fields using function interpolation.
Authentication​
There are several components within Benthos which utilise NATS services. You will find that each of these components support optional advanced authentication parameters for NKeys and User Credentials.
An in depth tutorial can be found here.
NKey file​
The NATS server can use these NKeys in several ways for authentication. The simplest is for the server to be configured
with a list of known public keys and for the clients to respond to the challenge by signing it with its private NKey
configured in the nkey_file
field.
More details here.
User Credentials file​
NATS server supports decentralized authentication based on JSON Web Tokens (JWT). Clients need an user JWT and a corresponding NKey secret when connecting to a server which is configured to use this authentication scheme.
The user_credentials_file
field should point to a file containing both the private key and the JWT and can be
generated with the nsc tool.
More details here.
Fields​
urls
​
A list of URLs to connect to. If an item of the list contains commas it will be expanded into multiple URLs.
Type: array
# Examplesurls:- nats://127.0.0.1:4222urls:- nats://username:password@127.0.0.1:4222
queue
​
An optional queue group to consume as.
Type: string
subject
​
A subject to consume from. Supports wildcards for consuming multiple subjects.
Type: string
# Examplessubject: foo.bar.bazsubject: foo.*.bazsubject: foo.bar.*subject: foo.>
durable
​
Preserve the state of your consumer under a durable name.
Type: string
deliver
​
Determines which messages to deliver when consuming without a durable subscriber.
Type: string
Default: "all"
Option | Summary |
---|---|
all | Deliver all available messages. |
last | Deliver starting with the last published messages. |
ack_wait
​
The maximum amount of time NATS server should wait for an ack from consumer.
Type: string
Default: "30s"
# Examplesack_wait: 100msack_wait: 5m
max_ack_pending
​
The maximum number of outstanding acks to be allowed before consuming is halted.
Type: int
Default: 1024
tls
​
Custom TLS settings can be used to override system defaults.
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: ""
# Examplesroot_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: ""
# Examplesroot_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
# Examplesclient_certs:- cert: fookey: barclient_certs:- cert_file: ./example.pemkey_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 to a certificate to use.
Type: string
Default: ""
tls.client_certs[].key_file
​
The path of a certificate key to use.
Type: string
Default: ""
auth
​
Optional configuration of NATS authentication parameters.
Type: object
auth.nkey_file
​
An optional file containing a NKey seed.
Type: string
# Examplesnkey_file: ./seed.nk
auth.user_credentials_file
​
An optional file containing user credentials which consist of an user JWT and corresponding NKey seed.
Type: string
# Examplesuser_credentials_file: ./user.creds