16/WAKU2-RPC

16/WAKU2-RPC

Waku v2 RPC API

Introduction #

This specification describes the JSON-RPC API that Waku v2 nodes MAY adhere to. Refer to the Waku v2 specification for more information on Waku v2.

Wire Protocol #

Transport #

Nodes SHOULD expose an accessible JSON-RPC API. The JSON-RPC version SHOULD be 2.0. Below is an example request:

{
  "jsonrpc":"2.0",
  "method":"get_waku_v2_debug_info",
  "params":[],
  "id":1
}

Fields #

Field Description
jsonrpc Contains the used JSON-RPC version (Default: 2.0)
method Contains the JSON-RPC method that is being called
params An array of parameters for the request
id The request ID

Types #

In this specification, the primitive types Boolean, String, Number and Null, as well as the structured types Array and Object, are to be interpreted according to the JSON-RPC specification. It also adopts the same capitalisation conventions.

The following structured types are defined for use throughout the document:

WakuMessage #

Refer to Waku Message specification for more information.

WakuMessage is an Object containing the following fields:

Field Type Inclusion Description
payload String mandatory The message payload as a hex encoded data string
contentTopic String optional Message content topic for optional content-based filtering
version Number optional Message version. Used to indicate type of payload encryption. Default version is 0 (no payload encryption).
timestamp Number optional The time at which the message is generated by its sender. This field holds the Unix epoch time in seconds as a 64-bits float value. The fractional part represents sub-seconds.

Method naming #

The JSON-RPC methods in this document are designed to be mappable to HTTP REST endpoints. Method names follow the pattern <method_type>_waku_<protocol_version>_<api>_<api_version>_<resource>

  • <method_type>: prefix of the HTTP method type that most closely matches the JSON-RPC function. Supported method_type values are get, post, put, delete or patch.
  • <protocol_version>: Waku version. Currently v2.
  • <api>: one of the listed APIs below, e.g. store, debug, or relay.
  • <api_version>: API definition version. Currently v1 for all APIs.
  • <resource>: the resource or resource path being addressed

The method post_waku_v2_relay_v1_message, for example, would map to the HTTP REST endpoint POST /waku/v2/relay/v1/message.

Debug API #

Types #

The following structured types are defined for use on the Debug API:

WakuInfo #

WakuInfo is an Object containing the following fields:

Field Type Inclusion Description
listenStr String mandatory Address that the node is listening for

get_waku_v2_debug_v1_info #

The get_waku_v2_debug_v1_info method retrieves information about a Waku v2 node

Parameters #

none

Response #

  • WakuInfo - information about a Waku v2 node

Relay API #

Refer to the Waku Relay specification for more information on the relaying of messages.

Types #

The following structured types are defined for use on the Relay API:

WakuRelayMessage #

WakuRelayMessage is an Object containing the following fields:

Field Type Inclusion Description
payload String mandatory The payload being relayed as a hex encoded data string
contentTopic String optional Message content topic for optional content-based filtering

NOTE: WakuRelayMessage maps directly to a WakuMessage, except that the latter contains an explicit message version. For WakuRelay purposes, the versioning is handled by the API.

post_waku_v2_relay_v1_message #

The post_waku_v2_relay_v1_message method publishes a message to be relayed on a PubSub topic

Parameters #

Field Type Inclusion Description
topic String mandatory The PubSub topic being published on
message WakuRelayMessage mandatory The message being relayed

Response #

  • Bool - true on success or an error on failure.

post_waku_v2_relay_v1_subscriptions #

The post_waku_v2_relay_v1_subscriptions method subscribes a node to an array of PubSub topics.

Parameters #

Field Type Inclusion Description
topics Array[String] mandatory The PubSub topics being subscribed to

Response #

  • Bool - true on success or an error on failure.

delete_waku_v2_relay_v1_subscriptions #

The delete_waku_v2_relay_v1_subscriptions method unsubscribes a node from an array of PubSub topics.

Parameters #

Field Type Inclusion Description
topics Array[String] mandatory The PubSub topics being unsubscribed from

Response #

  • Bool - true on success or an error on failure.

get_waku_v2_relay_v1_messages #

The get_waku_v2_relay_v1_messages method returns a list of messages that were received on a subscribed PubSub topic after the last time this method was called. The server MUST respond with an error if no subscription exists for the polled topic. If no message has yet been received on the polled topic, the server SHOULD return an empty list. This method can be used to poll a topic for new messages.

Parameters #

Field Type Inclusion Description
topic String mandatory The PubSub topic to poll for the latest messages

Response #

  • Array[WakuMessage] - the latest messages on the polled topic or an error on failure.

Store API #

Refer to the Waku Store specification for more information on message history retrieval.

Types #

The following structured types are defined for use on the Store API:

StoreResponse #

StoreResponse is an Object containing the following fields:

Field Type Inclusion Description
messages Array[WakuMessage] mandatory Array of retrieved historical messages
pagingOptions PagingOptions conditional Paging information from which to resume further historical queries

PagingOptions #

PagingOptions is an Object containing the following fields:

Field Type Inclusion Description
pageSize Number mandatory Number of messages to retrieve per page
cursor Index optional Message Index from which to perform pagination. If not included and forward is set to true, paging will be performed from the beginning of the list. If not included and forward is set to false, paging will be performed from the end of the list.
forward Bool mandatory true if paging forward, false if paging backward

Index #

Index is an Object containing the following fields:

Field Type Inclusion Description
digest String mandatory A hash for the message at this Index
receivedTime Number mandatory UNIX timestamp at which the message at this Index was received

ContentFilter #

ContentFilter is an Object containing the following fields:

Field Type Inclusion Description
contentTopic String mandatory The content topic of a WakuMessage

get_waku_v2_store_v1_messages #

The get_waku_v2_store_v1_messages method retrieves historical messages on specific content topics. This method MAY be called with PagingOptions, to retrieve historical messages on a per-page basis. If the request included PagingOptions, the node MUST return messages on a per-page basis and include PagingOptions in the response. These PagingOptions MUST contain a cursor pointing to the Index from which a new page can be requested.

Parameters #

Field Type Inclusion Description
pubsubTopic String optional The pubsub topic on which a WakuMessage is published
contentFilters Array[ContentFilter] optional Array of content filters to query for historical messages
startTime Number optional The inclusive lower bound on the timestamp of queried WakuMessages. This parameter holds the Unix epoch time in seconds as a 64-bits float value. The fractional part represents sub-seconds.
endTime Number optional The inclusive upper bound on the timestamp of queried WakuMessages. This parameter holds the Unix epoch time in seconds as a 64-bits float value. The fractional part represents sub-seconds.
pagingOptions PagingOptions optional Pagination information

Response #

  • StoreResponse - the response to a query for historical messages.

Filter API #

Refer to the Waku Filter specification for more information on content filtering.

Types #

The following structured types are defined for use on the Filter API:

ContentFilter #

ContentFilter is an Object containing the following fields:

Field Type Inclusion Description
contentTopic String mandatory message content topic

post_waku_v2_filter_v1_subscription #

The post_waku_v2_filter_v1_subscription method creates a subscription in a light node for messages that matches a content filter and, optionally, a PubSub topic.

Parameters #

Field Type Inclusion Description
contentFilters Array[ContentFilter] mandatory Array of content filters being subscribed to
topic String optional Message topic

Response #

  • Bool - true on success or an error on failure.

delete_waku_v2_filter_v1_subscription #

The delete_waku_v2_filter_v1_subscription method removes subscriptions in a light node matching a content filter and, optionally, a PubSub topic.

Parameters #

Field Type Inclusion Description
contentFilters Array[ContentFilter] mandatory Array of content filters being unsubscribed from
topic String optional Message topic

Response #

  • Bool - true on success or an error on failure.

get_waku_v2_filter_v1_messages #

The get_waku_v2_filter_v1_messages method returns a list of messages that were received on a subscribed content topic after the last time this method was called. The server MUST respond with an error if no subscription exists for the polled content topic. If no message has yet been received on the polled content topic, the server SHOULD respond with an empty list. This method can be used to poll a content topic for new messages.

Parameters #

Field Type Inclusion Description
contentTopic String mandatory The content topic to poll for the latest messages

Response #

  • Array[WakuMessage] - the latest messages on the polled content topic or an error on failure.

Admin API #

The Admin API provides privileged accesses to the internal operations of a Waku v2 node.

Types #

The following structured types are defined for use on the Admin API:

WakuPeer #

WakuPeer is an Object containing the following fields:

Field Type Inclusion Description
multiaddr String mandatory Multiaddress containing this peer’s location and identity
protocol String mandatory Protocol that this peer is registered for
connected bool mandatory true if peer has active connection for this protocol, false if not

get_waku_v2_admin_v1_peers #

The get_waku_v2_admin_v1_peers method returns an array of peers registered on this node. Since a Waku v2 node may open either continuous or ad hoc connections, depending on the negotiated protocol, these peers may have different connected states. The same peer MAY appear twice in the returned array, if it is registered for more than one protocol.

Parameters #

none

Response #

  • Array[WakuPeer] - Array of peers registered on this node

post_waku_v2_admin_v1_peers #

The post_waku_v2_admin_v1_peers method connects a node to a list of peers.

Parameters #

Field Type Inclusion Description
peers Array[String] mandatory Array of peer multiaddrs to connect to. Each multiaddr must contain the location and identity addresses of a peer.

Response #

  • Bool - true on success or an error on failure.

Private API #

The Private API provides functionality to encrypt/decrypt WakuMessage payloads using either symmetric or asymmetric cryptography. This allows backwards compatibility with Waku v1 nodes. It is the API client’s responsibility to keep track of the keys used for encrypted communication. Since keys must be cached by the client and provided to the node to encrypt/decrypt payloads, a Private API SHOULD NOT be exposed on non-local or untrusted nodes.

Types #

The following structured types are defined for use on the Private API:

KeyPair #

KeyPair is an Object containing the following fields:

Field Type Inclusion Description
privateKey String mandatory Private key as hex encoded data string
publicKey String mandatory Public key as hex encoded data string

get_waku_v2_private_v1_symmetric_key #

Generates and returns a symmetric key that can be used for message encryption and decryption.

Parameters #

none

Response #

  • String - A new symmetric key as hex encoded data string

get_waku_v2_private_v1_asymmetric_keypair #

Generates and returns a public/private key pair that can be used for asymmetric message encryption and decryption.

Parameters #

none

Response #

  • KeyPair - A new public/private key pair as hex encoded data strings

post_waku_v2_private_v1_symmetric_message #

The post_waku_v2_private_v1_symmetric_message method publishes a message to be relayed on a PubSub topic.

Before being relayed, the message payload is encrypted using the supplied symmetric key. The client MUST provide a symmetric key.

Parameters #

Field Type Inclusion Description
topic String mandatory The PubSub topic being published on
message WakuRelayMessage mandatory The (unencrypted) message being relayed
symkey String mandatory The hex encoded symmetric key to use for payload encryption. This field MUST be included if symmetric key cryptography is selected

Response #

  • Bool - true on success or an error on failure.

post_waku_v2_private_v1_asymmetric_message #

The post_waku_v2_private_v1_asymmetric_message method publishes a message to be relayed on a PubSub topic.

Before being relayed, the message payload is encrypted using the supplied public key. The client MUST provide a public key.

Parameters #

Field Type Inclusion Description
topic String mandatory The PubSub topic being published on
message WakuRelayMessage mandatory The (unencrypted) message being relayed
publicKey String mandatory The hex encoded public key to use for payload encryption. This field MUST be included if asymmetric key cryptography is selected

Response #

  • Bool - true on success or an error on failure.

get_waku_v2_private_v1_symmetric_messages #

The get_waku_v2_private_v1_symmetric_messages method decrypts and returns a list of messages that were received on a subscribed PubSub topic after the last time this method was called. The server MUST respond with an error if no subscription exists for the polled topic. If no message has yet been received on the polled topic, the server SHOULD return an empty list. This method can be used to poll a topic for new messages.

Before returning the messages, the server decrypts the message payloads using the supplied symmetric key. The client MUST provide a symmetric key.

Parameters #

Field Type Inclusion Description
topic String mandatory The PubSub topic to poll for the latest messages
symkey String mandatory The hex encoded symmetric key to use for payload decryption. This field MUST be included if symmetric key cryptography is selected

Response #

get_waku_v2_private_v1_asymmetric_messages #

The get_waku_v2_private_v1_asymmetric_messages method decrypts and returns a list of messages that were received on a subscribed PubSub topic after the last time this method was called. The server MUST respond with an error if no subscription exists for the polled topic. If no message has yet been received on the polled topic, the server SHOULD return an empty list. This method can be used to poll a topic for new messages.

Before returning the messages, the server decrypts the message payloads using the supplied private key. The client MUST provide a private key.

Parameters #

Field Type Inclusion Description
topic String mandatory The PubSub topic to poll for the latest messages
privateKey String mandatory The hex encoded private key to use for payload decryption. This field MUST be included if asymmetric key cryptography is selected

Response #

Example usage #

Store API #

get_waku_v2_store_v1_messages #

This method is part of the store API and the specific resources to retrieve are (historical) messages. The protocol (waku) is on v2, whereas the Store API definition is on v1.

  1. get all the historical messages for content topic "/waku/2/default-content/proto"; no paging required

Request #

curl -d '{"jsonrpc":"2.0","id":"id","method":"get_waku_v2_store_v1_messages", "params":["", [{"contentTopic":"/waku/2/default-content/proto"}]]}' --header "Content-Type: application/json" http://localhost:8545

{
  "jsonrpc": "2.0",
  "id": "id",
  "method": "get_waku_v2_store_v1_messages",
  "params": [
    "",
    [
      {"contentTopic": "/waku/2/default-content/proto"}
    ]
  ]
}

Response #

{
  "jsonrpc": "2.0",
  "id": "id",
  "result": {
    "messages": [
      {
        "payload": [
          1
        ],
        "contentTopic": "/waku/2/default-content/proto",
        "version": 0
      },
      {
        "payload": [
          2
        ],
        "contentTopic": "/waku/2/default-content/proto",
        "version": 0
      },
      {
        "payload": [
          3
        ],
        "contentTopic": "/waku/2/default-content/proto",
        "version": 0
      }
    ],
    "pagingInfo": null
  },
  "error": null
}

  1. get a single page of historical messages for content topic "/waku/2/default-content/proto"; 2 messages per page, backward direction. Since this is the initial query, no cursor is provided, so paging will be performed from the end of the list.

Request #

curl -d '{"jsonrpc":"2.0","id":"id","method":"get_waku_v2_store_v1_messages", "params":[ "", [{"contentTopic":"/waku/2/default-content/proto"}],{"pageSize":2,"forward":false}]}' --header "Content-Type: application/json" http://localhost:8545

{
  "jsonrpc": "2.0",
  "id": "id",
  "method": "get_waku_v2_store_v1_messages",
  "params": [
    "",
    [
      {"contentTopic": "/waku/2/default-content/proto"}
    ],
    {
      "pageSize": 2,
      "forward": false
    }
  ]
}

Response #

{
  "jsonrpc": "2.0",
  "id": "id",
  "result": {
    "messages": [
      {
        "payload": [
          2
        ],
        "contentTopic": "/waku/2/default-content/proto",
        "version": 0
      },
      {
        "payload": [
          3
        ],
        "contentTopic": "/waku/2/default-content/proto",
        "version": 0
      }
    ],
    "pagingInfo": {
      "pageSize": 2,
      "cursor": {
        "digest": "abcdef",
        "receivedTime": 1605887187
      },
      "forward": false
    }
  },
  "error": null
}

  1. get the next page of historical messages for content topic "/waku/2/default-content/proto", using the cursor received above; 2 messages per page, backward direction.

Request #

curl -d '{"jsonrpc":"2.0","id":"id","method":"get_waku_v2_store_v1_messages", "params":[ "", [{"contentTopic":"/waku/2/default-content/proto"}],{"pageSize":2,"cursor":{"digest":"abcdef","receivedTime":1605887187.00},"forward":false}]}' --header "Content-Type: application/json" http://localhost:8545

{
  "jsonrpc": "2.0",
  "id": "id",
  "method": "get_waku_v2_store_v1_messages",
  "params": [
    "",
    [
      {"contentTopic": "/waku/2/default-content/proto"}
    ],
    {
      "pageSize": 2,
      "cursor": {
        "digest": "abcdef",
        "receivedTime": 1605887187
      },
      "forward": false
    }
  ]
}

Response #

{
  "jsonrpc": "2.0",
  "id": "id",
  "result": {
    "messages": [
      {
        "payload": [
          1
        ],
        "contentTopic": "/waku/2/default-content/proto",
        "version": 0
      }
    ],
    "pagingInfo": {
      "pageSize": 2,
      "cursor": {
        "digest": "123abc",
        "receivedTime": 1605866187
      },
      "forward": false
    }
  },
  "error": null
}

References #

  1. JSON-RPC specification
  2. LibP2P Addressing
  3. LibP2P PubSub specification - topic descriptor
  4. Waku v2 specification

Copyright #

Copyright and related rights waived via CC0.