Add L1<>L2 interop. Closes #37

[juliangruber]

Closes #37.

Documentation of approach and current direction: https://gist.github.com/juliangruber/032276dbdd44e056d5f7fc18d8debc3e

TODO

• Make the L2 fallback configurable
  • Disabled (main net)
  • Fire and forget (test net initially, then main net)
  • Full integration (post l1 launch)
• Verify L2's car response
• Extract raw data from car if ?format=raw

Mock client:

import http2 from 'node:http2'
import { CarWriter } from '@ipld/car'
import { Readable } from 'node:stream'
import { CID } from 'multiformats/cid'
import { sha256 } from 'multiformats/hashes/sha2'
import * as raw from 'multiformats/codecs/raw'

const client = http2.connect('https://127.0.0.1')
const req = client.request({
  ':path': `/register/http2?nocache=1`,
})
req.on('data', async d => {
  const line = d.toString().trim()
  if (line === '') return
  const obj = JSON.parse(line)
  console.log(obj)
  if (obj.cid) {
    console.log('-> sending reply')
    const r = client.request({
      ':path': `/data/${obj.cid}`,
      ':method': 'POST'
    })
    const bytes = new TextEncoder().encode('hi')
    const hash = await sha256.digest(raw.encode(bytes))
    const cid = CID.create(1, raw.code, hash)
    const { writer, out } = await CarWriter.create(cid)
    Readable.from(out).pipe(r)
    await writer.put({ cid, bytes })
    await writer.close()
  }
})
req.on('end', () => {
  client.close()
})
req.end()

$ NODE_TLS_REJECT_UNAUTHORIZED=0 NODE_NO_WARNINGS=1 node l2.mjs

[bajtos]

Nice! I left a few comments to consider.

[DiegoRBaquero]

Should be fine to deploy given that it´s FF for test net.