exporter/

SSV - Exporter

Overview

Exporter (AKA Fullnode) node is responsible for collecting and exporting information from the network to external systems such as the Explorer.

Usage

In order to run an exporter, add the following in the config.yaml:

p2p:
  Subnets: 0xffffffffffffffffffffffffffffffff
  MaxPeers: 150 # recommended but not a must
WebSocketAPIPort: 15000

In case the node misses messages, you can increase the amount of goroutines that handles incoming messages by:

ssv:
  ValidatorOptions:
    MsgWorkersCount: 2048 # default is 1024

With environment variables:

SUBNETS=0xffffffffffffffffffffffffffffffff
WS_API_PORT=15000
P2P_MAX_PEERS=150 # recommended but not a must

APIs

Exporter Node provides WebSocket endpoints for reading the collected data.
There are 2 types of end-points:

• stream - exporter pushes live data (decided messages) to the active sockets
• query - initiated by the consumer on demand to fetch historical data

Message Structure

Request holds a filter for making queries of specific data and a type to distinguish between messages:

{
  "type": "decided"
  "filter": {
    "from": number,
    "to": number,
    "role": "ATTESTER" | "AGGREGATOR" | "PROPOSER",
    "publicKey": string
  }
}

Response extends the Request with a data section that contains the corresponding results:

{
  "type": "decided"
  "filter": {
    "from": number,
    "to": number,
    "role": "ATTESTER" | "AGGREGATOR" | "PROPOSER",
    "publicKey": string
  }
  "data": DecidedMessage[]
}

In addition, response might reflect an error, see Error Handling:

{
  "type": "error",
  "data": string[]
}

Data Model

The following objects will be used by the API:

Decided Messages

{
  "message": {
    "type": 3,
    "round": 1,
    "identifier": "...",
    "seq_number": 23,
    "value": "..."
  },
  "signature": "...",
  "signer_ids": [2, 1, 3]
}

End Points

Stream

/stream is an API that allows consumers to get live data that is collected by the exporter, which will push the information it receives from SSV nodes.

For example, exporter will push a message for a new decided message that was broadcast-ed in the network:

{
  "type": "decided",
  "filter": {"publicKey": "...", "role": "ATTESTER", "from": 2341, "to": 2341 },
  "data": [{ ... }]
}

Query

/query is an API that allows some consumers to request data, by specifying filter.

Example request:

{ "type": "decided", "filter": { "publicKey": "...", "role": "ATTESTER", "from": 2, "to": 4 } }

The corresponding response:

{ "type": "decided", "filter": { "publicKey": "...", "role": "ATTESTER", "from": 2, "to": 4 }, "data":[...] }

In case of bad request or some internal error, the response will be of type "error".

Some examples:

• Bad input (corrupted JSON) produces:

  {
    "type": "error",
    "filter": {
      "from": 0,
      "to": 0
    },
    "data": [
      "could not parse network message"
    ]
  }
  

• Unknown message type results:

  {
    "type": "error",
    "filter": {
      "from": 0,
      "to": 0
    },
    "data": [
      "bad request - unknown message type 'foo'"
    ]
  }
  

Explore API

Use a tool for WebSockets (such as wscat) to interact with the API.

wscat -c ws://ws-exporter.stage.ssv.network/query

Once connection is ready, type your query:

> { "type": "decided", "filter": { "publicKey": "...", "role": "ATTESTER", "from": 2, "to": 4 } }

The expected results contain a list of desired decided messages, in our case in index [2, 4]

< { "type": "decided", "filter": { "publicKey": "...", "role": "ATTESTER", "from": 2, "to": 4 }, "data":[...] }