Substreams Sink Webhook

substreams-sink-webhook is a tool that allows developers to pipe data extracted from a blockchain to Webhook.

HTTP Server examples

• Bun - https://bun.sh/
• Express - https://expressjs.com/
• node:http - https://nodejs.org/api/http.html
• POST request

📖 References

• Substreams documentation
• TweetNaCl
  • TweetNaCl: a crypto library in 100 tweets
  • TweetNaCl.js
  • TweetNaclSharp
• Discord Webhooks
  • interactions-and-bot-users
  • security-and-authorization

POST Message

The POST message will be a JSON object with the following structure:

headers

POST http://localhost:3000 HTTP/1.1
content-type: application/json
x-signature-ed25519: 8f01c66ccda5b987c43d913290419572ea586dbef2077fa166c4a84797e1d2c76b305bc67ed43efb1fc841562620a61cb59c4d8a13de689a2e98ead19190f80c
x-signature-timestamp: 1707776632

body

The body will be a flatten JSON string with the following structure:

{
  "status": 200,
  "cursor": "OJGbpO9ZnZcwvxW38_FO8KWwLpcyA1lrUQPgKRFL04Py8yCW35v1VTB1O0-Elami3RztQlOp2tmcHC9y9ZQFuoDrxLpj6yU-FXorwoHr_OfqLPumMQwTJ-hgWeuKYNLeWDjTagn4ersEtNGzbvLaY0UxZZUhK2G62z1VptdXJfEWuiJmyjmrIZrRhK-WoNAS_rEkQ7L1xCmhDzJ4K0dTPcSDNPKZuDR2",
  "session": {
    "traceId": "3cbb0a1c772a47a72995d95f4c6d2cff",
    "resolvedStartBlock": 53448515
  },
  "clock": {
    "timestamp": "2024-02-12T22:23:51.000Z",
    "number": 53448530,
    "id": "f843bc26cea0cbd50b09699546a8a97de6a1727646c17a857c5d8d868fc26142"
  },
  "manifest": {
    "substreamsEndpoint": "https://polygon.substreams.pinax.network:443",
    "chain": "polygon",
    "finalBlockOnly": "false",
    "moduleName": "map_blocks",
    "type": "sf.substreams.v1.Clock",
    "moduleHash": "44c506941d5f30db6cca01692624395d1ac40cd1"
  },
  "data": {
    ...
  }
}

Generate Ed25519 public & private key pair

$ bunx substreams-sink-webhook keypair
{
  "publicKey": "36a89085d54d866c60ecccc2bf332d1c0dd5f1a810af175b1cfb7ff9e64b67d6",
  "privateKey": "67603675f8160b4e4ca67770eaf7df797f3a9617665a84ec3e9baf92c403fb4f"
}

or using curl

$ curl http://localhost:9102/keypair

Validate Ed25519 signature

import nacl from "tweetnacl";

// ...HTTP server
const PUBLIC_KEY = "APPLICATION_PUBLIC_KEY";

// get headers and body from POST request
const signature = request.headers.get("x-signature-ed25519");
const timestamp = request.headers.get("x-signature-timestamp");
const body = await request.text();

// validate signature using public key
const isVerified = nacl.sign.detached.verify(
  Buffer.from(timestamp + body),
  Buffer.from(signature, "hex"),
  Buffer.from(PUBLIC_KEY, "hex")
);

if (!isVerified) {
  return new Response("invalid request signature", { status: 401 });
}

.env Environment variables

# Webhook
PORT=9102
WEBHOOK_URL=http://127.0.0.1:3000

# Get Substreams API Key
# https://app.pinax.network
# https://app.streamingfast.io/
SUBSTREAMS_API_KEY=<Substreams API Token @ https://pinax.network>

# Substreams Package (*.spkg)
MANIFEST=https://github.com/pinax-network/substreams/releases/download/blocks-v0.1.0/blocks-v0.1.0.spkg
MODULE_NAME=map_blocks
START_BLOCK=-10
PRODUCTION_MODE=true

# Webhook (Optional)
PRIVATE_KEY=<Ed25519 Private Key>
MAXIMUM_ATTEMPTS=100
VERBOSE=true

Help

$ substreams-sink-webhook --help

Usage: substreams-sink-webhook run [options]

Substreams Sink Webhook

Options:
  -e --substreams-endpoint <string>    Substreams gRPC endpoint to stream data from (env: SUBSTREAMS_ENDPOINT)
  --manifest <string>                  URL of Substreams package (env: MANIFEST)
  --module-name <string>               Name of the output module (declared in the manifest) (env: MODULE_NAME)
  -s --start-block <int>               Start block to stream from (defaults to -1, which means the initialBlock of the first module you are streaming) (default: "-1", env: START_BLOCK)
  -t --stop-block <int>                Stop block to end stream at, inclusively (env: STOP_BLOCK)
  -p, --params <string...>             Set a params for parameterizable modules. Can be specified multiple times. (ex: -p module1=valA -p module2=valX&valY) (default: [], env: PARAMS)
  --substreams-api-key <string>        API key for the Substream endpoint (env: SUBSTREAMS_API_KEY)
  --delay-before-start <int>           Delay (ms) before starting Substreams (default: 0, env: DELAY_BEFORE_START)
  --cursor-path <string>               File path or URL to cursor lock file (default: "cursor.lock", env: CURSOR_PATH)
  --http-cursor-auth <string>          Basic auth credentials for http cursor (ex: username:password) (env: HTTP_CURSOR_AUTH)
  --production-mode <boolean>          Enable production mode, allows cached Substreams data if available (default: "false", env: PRODUCTION_MODE)
  --inactivity-seconds <int>           If set, the sink will stop when inactive for over a certain amount of seconds (default: 300, env: INACTIVITY_SECONDS)
  --hostname <string>                  The process will listen on this hostname for any HTTP and Prometheus metrics requests (default: "localhost", env: HOSTNAME)
  --port <int>                         The process will listen on this port for any HTTP and Prometheus metrics requests (default: 9102, env: PORT)
  --metrics-labels [string...]         To apply generic labels to all default metrics (ex: --labels foo=bar) (default: {}, env: METRICS_LABELS)
  --collect-default-metrics <boolean>  Collect default metrics (default: "false", env: COLLECT_DEFAULT_METRICS)
  --headers [string...]                Set headers that will be sent on every requests (ex: --headers X-HEADER=headerA) (default: {}, env: HEADERS)
  --final-blocks-only <boolean>        Only process blocks that have pass finality, to prevent any reorg and undo signal by staying further away from the chain HEAD (default: "false", env: FINAL_BLOCKS_ONLY)
  --verbose <boolean>                  Enable verbose logging (default: "false", env: VERBOSE)
  --webhook-url <string>               Webhook URL to send POST (env: WEBHOOK_URL)
  --private-key <string>               Ed25519 private key to sign POST data payload (env: PRIVATE_KEY)
  --maximum-attempts <number>          Maximum attempts to retry POST (default: 100, env: MAXIMUM_ATTEMPTS)
  -h, --help                           display help for command

Docker environment

Pull from GitHub Container registry

docker pull ghcr.io/pinax-network/substreams-sink-webhook:latest

Run with .env file

docker run -it --rm --env-file .env ghcr.io/pinax-network/substreams-sink-webhook:latest run

Build from source

docker build -t substreams-sink-webhook .

Features

• POST data to URL
• Include Substreams Manifest to payload
  • substreamsEndpoint
  • chain
  • finalBlockOnly
  • moduleName
  • type
  • moduleHash
• Include Substreams Clock to payload
  • timestamp
  • number
  • id
• Includes Substreams Session to payload
  • traceId
  • resolvedStartBlock
• Includes Substreams cursor to payload
• Signing policy
  • TweetNaCl
  • R1 private keys
  • Ether.js
• All messages are sent in block order, no need to parallelize
• Support for Final Blocks Only --final-blocks-only
• Support for Production Mode --production-mode
• Retry policy
  • Exponential backoff (2x)
  • Initial Interval (1s)
  • Maximum Attempts (Infinity)
  • Maximum Interval (100 * initialInterval)
• Dockerfile
• Provide CLI arguments or Environment Variables (.env)
• Allow params injection via --params or -p
• Prometheus metrics
  • includes metrics from substreams-sink
  • HTTP POST requests
  • HTTP errors
• PING URL on start (invalid + valid)
• Save cursor.lock only after successful POST
  • Enforce retry policy on HTTP cursor updates