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nats_kv

BETA

This component is mostly stable but breaking changes could still be made outside of major version releases if a fundamental problem with the component is found.

Perform operations on a NATS key-value bucket.

Introduced in version 1.0.0.

# Common config fields, showing default values
label: ""
nats_kv:
  urls: [] # No default (required)
  bucket: my_kv_bucket # No default (required)
  operation: "" # No default (required)
  key: foo # No default (required)

KV Operations​

The NATS KV processor supports a multitude of KV operations via the operation field. Along with get, put, and delete, this processor supports atomic operations like update and create, as well as utility operations like purge, history, and keys.

Metadata​

This processor adds the following metadata fields to each message, depending on the chosen operation:

get, get_revision​

- nats_kv_key
- nats_kv_bucket
- nats_kv_revision
- nats_kv_delta
- nats_kv_operation
- nats_kv_created

create, update, delete, purge​

- nats_kv_key
- nats_kv_bucket
- nats_kv_revision
- nats_kv_operation

keys​

- nats_kv_bucket

Connection Name​

When monitoring and managing a production NATS system, it is often useful to know which connection a message was send/received from. This can be achieved by setting the connection name option when creating a NATS connection.

Bento will automatically set the connection name based off the label of the given NATS component, so that monitoring tools between NATS and bento can stay in sync.

Authentication​

There are several components within Bento 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​

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.

Alternatively, the user_jwt field can contain a plain text JWT and the user_nkey_seedcan contain the plain text NKey Seed.

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

# Examples

urls:
  - nats://127.0.0.1:4222

urls:
  - nats://username:password@127.0.0.1:4222

bucket​

The name of the KV bucket.

Type: string

# Examples

bucket: my_kv_bucket

operation​

The operation to perform on the KV bucket.

Type: string

OptionSummary
createAdds the key/value pair if it does not exist. Returns an error if it already exists.
deleteDeletes the key/value pair, but keeps historical values.
getReturns the latest value for key.
get_revisionReturns the value of key for the specified revision.
historyReturns historical values of key as an array of objects containing the following fields: key, value, bucket, revision, delta, operation, created.
keysReturns the keys in the bucket which match the keys_filter as an array of strings.
purgeDeletes the key/value pair and all historical values.
putPlaces a new value for the key into the store.
updateUpdates the value for key only if the revision matches the latest revision.

key​

The key for each message. Supports wildcards for the history and keys operations. This field supports interpolation functions.

Type: string

# Examples

key: foo

key: foo.bar.baz

key: foo.*

key: foo.>

key: foo.${! json("meta.type") }

revision​

The revision of the key to operate on. Used for get_revision and update operations. This field supports interpolation functions.

Type: string

# Examples

revision: "42"

revision: ${! @nats_kv_revision }

timeout​

The maximum period to wait on an operation before aborting and returning an error.

Type: string
Default: "5s"

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 1.0.0 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.

Secret

This field contains sensitive information that usually shouldn't be added to a config directly, read our secrets page for more info.

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.

Secret

This field contains sensitive information that usually shouldn't be added to a config directly, read our secrets page for more info.

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. Warning: Since it does not authenticate the ciphertext, it is vulnerable to padding oracle attacks that can let an attacker recover the plaintext.

Secret

This field contains sensitive information that usually shouldn't be added to a config directly, read our secrets page for more info.

Type: string
Default: ""

# Examples

password: foo

password: ${KEY_PASSWORD}

auth​

Optional configuration of NATS authentication parameters.

Type: object

auth.nkey_file​

An optional file containing a NKey seed.

Type: string

# Examples

nkey_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

# Examples

user_credentials_file: ./user.creds

auth.user_jwt​

An optional plain text user JWT (given along with the corresponding user NKey Seed).

Secret

This field contains sensitive information that usually shouldn't be added to a config directly, read our secrets page for more info.

Type: string

auth.user_nkey_seed​

An optional plain text user NKey Seed (given along with the corresponding user JWT).

Secret

This field contains sensitive information that usually shouldn't be added to a config directly, read our secrets page for more info.

Type: string