[WIP] Support ESM targets, add BCH support

bch/bch-processor/README.md

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+# @subsquid/bch-processor
+
+Data fetcher and mappings executor for BitcoinCash chain.

bch/bch-processor/package.json

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+{
+  "name": "@subsquid/bch-processor",
+  "type": "module",
+  "version": "1.0.0",
+  "description": "Data fetcher and mappings executor for BitcoinCash chain",
+  "license": "GPL-3.0-or-later",
+  "repository": "git@github.com:subsquid/squid.git",
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://registry.npmjs.org/"
+  },
+  "files": [
+    "lib",
+    "src"
+  ],
+  "main": "lib/index.js",
+  "dependencies": {
+    "@bitauth/libauth": "^3.0.0",
+    "@subsquid/http-client": "^1.6.0",
+    "@subsquid/logger": "^1.3.3",
+    "@subsquid/rpc-client": "^4.11.0",
+    "@subsquid/util-internal": "^3.2.0",
+    "@subsquid/util-internal-archive-client": "^0.1.2",
+    "@subsquid/util-internal-hex": "^1.2.2",
+    "@subsquid/util-internal-ingest-tools": "^1.1.4",
+    "@subsquid/util-internal-processor-tools": "^4.1.1",
+    "@subsquid/util-internal-range": "^0.3.0",
+    "@subsquid/util-internal-validation": "^0.7.0",
+    "@subsquid/util-timeout": "^2.3.2",
+    "bitcoin-minimal": "^1.1.7",
+    "lru-cache": "^11.0.2",
+    "p2p-cash": "^1.1.12"
+  },
+  "devDependencies": {
+    "@types/node": "^18.18.14",
+    "typescript": "~5.5.4"
+  },
+  "scripts": {
+    "build": "rm -rf lib && tsc"
+  }
+}

bch/bch-processor/src/ds-archive/client.ts

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+import {addErrorContext} from '@subsquid/util-internal'
+import {ArchiveClient} from '@subsquid/util-internal-archive-client'
+import {archiveIngest} from '@subsquid/util-internal-ingest-tools'
+import {Batch, DataSource} from '@subsquid/util-internal-processor-tools'
+import {getRequestAt, RangeRequest} from '@subsquid/util-internal-range'
+import {cast} from '@subsquid/util-internal-validation'
+import assert from 'assert'
+import {Bytes32} from '../interfaces/base.js'
+import {FieldSelection} from '../interfaces/data.js'
+import {DataRequest} from '../interfaces/data-request.js'
+import {
+    Block,
+    BlockHeader,
+    Transaction
+} from '../mapping/entities.js'
+import {setUpRelations} from '../mapping/relations.js'
+import {getBlockValidator} from './schema.js'
+
+
+const NO_FIELDS = {}
+
+
+export class BchArchive implements DataSource<Block, DataRequest> {
+    constructor(private client: ArchiveClient) {}
+
+    getFinalizedHeight(): Promise<number> {
+        return this.client.getHeight()
+    }
+
+    async getBlockHash(height: number): Promise<Bytes32> {
+        let blocks = await this.client.query({
+            fromBlock: height,
+            toBlock: height,
+            includeAllBlocks: true
+        })
+        assert(blocks.length == 1)
+        return blocks[0].header.hash
+    }
+
+    async *getFinalizedBlocks(requests: RangeRequest<DataRequest>[], stopOnHead?: boolean | undefined): AsyncIterable<Batch<Block>> {
+        for await (let batch of archiveIngest({
+            requests,
+            client: this.client,
+            stopOnHead
+        })) {
+            let fields = getRequestAt(requests, batch.blocks[0].header.number)?.fields || NO_FIELDS
+
+            let blocks = batch.blocks.map(b => {
+                try {
+                    return this.mapBlock(b, fields)
+                } catch(err: any) {
+                    throw addErrorContext(err, {
+                        blockHeight: b.header.number,
+                        blockHash: b.header.hash
+                    })
+                }
+            })
+
+            yield {blocks, isHead: batch.isHead, mempoolTransactions: []}
+        }
+    }
+
+    private mapBlock(rawBlock: unknown, fields: FieldSelection): Block {
+        let validator = getBlockValidator(fields)
+
+        let src = cast(validator, rawBlock)
+
+        let {height, hash, parentHash, ...hdr} = src.header
+        if (hdr.timestamp) {
+            hdr.timestamp = hdr.timestamp * 1000 // convert to ms
+        }
+
+        let header = new BlockHeader(height, hash, parentHash)
+        Object.assign(header, hdr)
+
+        let block = new Block(header)
+
+        if (src.transactions) {
+            for (let {...props} of src.transactions) {
+                let tx = new Transaction(header, 0)
+                Object.assign(tx, props)
+                block.transactions.push(tx)
+            }
+        }
+
+        setUpRelations(block)
+
+        return block
+    }
+}

bch/bch-processor/src/ds-archive/schema.ts

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+import {weakMemo} from '@subsquid/util-internal'
+import {array, BYTES, object, option} from '@subsquid/util-internal-validation'
+import {FieldSelection} from '../interfaces/data.js'
+import {
+    getBlockHeaderProps,
+    getTxProps,
+} from '../mapping/schema.js'
+
+
+export const getBlockValidator = weakMemo((fields: FieldSelection) => {
+    let BlockHeader = object(getBlockHeaderProps(fields.block, true))
+
+    let Transaction = object({
+        hash: fields.transaction?.hash ? BYTES : undefined,
+        ...getTxProps(fields.transaction, true),
+    })
+
+    return object({
+        header: BlockHeader,
+        transactions: option(array(Transaction)),
+    })
+})