{"version":3,"file":"mempool.mjs","names":["createChain"],"sources":["../../src/providers/mempool.ts"],"sourcesContent":["/**\n * Mempool.space provider for Bitcoin and compatible forks serving Litecoin and Pepecoin.\n *\n * Public API, no key needed. All three serve address balances and transactions. Litecoin also\n * carries the fee and block endpoints, while Pepecoin does not expose enough data for those reads.\n *\n * https://mempool.space/docs/api\n */\n\nimport type {\n ProviderCapabilities,\n ProviderConfig,\n ChainKey,\n Balance,\n Transaction,\n TxHistoryOptions,\n GasData,\n GasUnit,\n BlockInfo,\n TxStatus,\n TokenTransfer,\n OpReturnPayload,\n Utxo,\n} from \"../core/types.js\";\nimport { Provider } from \"../core/provider.js\";\nimport { normalizeBaseUrl } from \"../core/client.js\";\nimport { NotFoundError, UnsupportedChainError, UnsupportedOperationError } from \"../core/errors.js\";\nimport { create as createChain } from \"@agntn/chains\";\nimport { formatWei } from \"../core/types.js\";\nimport { assertSafePathSegment } from \"../core/path-safety.js\";\nimport {\n getEsploraAddressHistory,\n getEsploraUtxos,\n selectEsploraRecipientOutput,\n} from \"../core/esplora.js\";\nimport type { EsploraUnspentOutput } from \"../core/esplora.js\";\n\nconst DEFAULT_BASE = \"https://mempool.space\";\n\nconst CHAIN_BASES: Partial> = {\n bitcoin: DEFAULT_BASE,\n litecoin: \"https://litecoinspace.org\",\n pepecoin: \"https://peppool.space\",\n};\n\n/** Fee rates come back in the chain's smallest unit per virtual byte. */\nconst FEE_UNITS: Partial> = {\n bitcoin: \"sat/vB\",\n litecoin: \"litoshi/vB\",\n};\n\ninterface MempoolAddressSummary {\n readonly address: string;\n readonly chain_stats: {\n readonly funded_txo_count: number;\n readonly funded_txo_sum: number | string;\n readonly spent_txo_count: number;\n readonly spent_txo_sum: number | string;\n readonly tx_count: number;\n };\n readonly mempool_stats?: {\n readonly funded_txo_count: number;\n readonly funded_txo_sum: number | string;\n readonly spent_txo_count: number;\n readonly spent_txo_sum: number | string;\n readonly tx_count: number;\n };\n}\n\ninterface MempoolTx {\n readonly txid: string;\n readonly version: number;\n readonly locktime: number;\n readonly vin: ReadonlyArray<{\n readonly txid: string;\n readonly vout: number;\n readonly prevout: {\n readonly scriptpubkey: string;\n readonly scriptpubkey_asm: string;\n readonly scriptpubkey_type: string;\n readonly scriptpubkey_address?: string;\n readonly value: number | string;\n } | null;\n readonly scriptsig: string;\n readonly sequence: number;\n readonly witness?: readonly string[];\n }>;\n readonly vout: ReadonlyArray<{\n readonly scriptpubkey: string;\n readonly scriptpubkey_asm: string;\n readonly scriptpubkey_type: string;\n readonly scriptpubkey_address?: string;\n readonly value: number | string;\n }>;\n readonly size: number;\n readonly weight: number;\n readonly fee: number | string;\n readonly status: {\n readonly confirmed: boolean;\n readonly block_height?: number;\n readonly block_hash?: string;\n readonly block_time?: number;\n };\n}\n\ninterface MempoolAddressTx {\n readonly txid: string;\n readonly version: number;\n readonly locktime: number;\n readonly vin: ReadonlyArray<{\n readonly txid: string;\n readonly vout: number;\n readonly prevout: {\n readonly scriptpubkey_address?: string;\n readonly value: number | string;\n } | null;\n readonly scriptsig: string;\n readonly sequence: number;\n }>;\n readonly vout: ReadonlyArray<{\n readonly scriptpubkey?: string;\n readonly scriptpubkey_type: string;\n readonly scriptpubkey_address?: string;\n readonly value: number | string;\n }>;\n readonly size: number;\n readonly weight: number;\n readonly fee: number | string;\n readonly status: {\n readonly confirmed: boolean;\n readonly block_height?: number;\n readonly block_time?: number;\n };\n}\n\ninterface MempoolFees {\n readonly fastestFee: number;\n readonly halfHourFee: number;\n readonly hourFee: number;\n readonly economyFee: number;\n readonly minimumFee: number;\n}\n\ninterface MempoolBlock {\n readonly id: string;\n readonly height: number;\n readonly version: number;\n readonly timestamp: number;\n readonly bits: number;\n readonly nonce: number;\n readonly difficulty: number;\n readonly merkle_root: string;\n readonly tx_count: number;\n readonly size: number;\n readonly weight: number;\n readonly previousblockhash: string;\n readonly mediantime: number;\n}\n\n/* Convert the smallest unit to a coin string without floating-point arithmetic. */\nfunction satToCoin(sat: number | string | bigint): string {\n return formatWei(String(sat), 8);\n}\n\n/** An OP_RETURN output opens with the opcode itself, so the hex says so before it is decoded. */\nconst OP_RETURN_SCRIPT = /^6a/i;\n\nconst OP_0 = 0x00;\nconst OP_PUSHDATA1 = 0x4c;\nconst OP_PUSHDATA2 = 0x4d;\nconst OP_PUSHDATA4 = 0x4e;\n\nconst OP_1NEGATE = 0x4f;\nconst OP_RESERVED = 0x50;\nconst OP_1 = 0x51;\nconst OP_16 = 0x60;\n\n/** Push opcodes that spell their length out, and how many bytes that length takes. */\nconst PUSHDATA_WIDTH: Record = {\n [OP_PUSHDATA1]: 1,\n [OP_PUSHDATA2]: 2,\n [OP_PUSHDATA4]: 4,\n};\n\nlet utf8: TextDecoder | undefined;\n\n/* `ignoreBOM` means \"leave a leading U+FEFF in the string\", which is where the filter can see it. */\nfunction decoder(): TextDecoder {\n utf8 ??= new TextDecoder(\"utf-8\", { fatal: true, ignoreBOM: true });\n return utf8;\n}\n\n/** Format characters, invisible on screen, and the line separators no renderer splits on. */\nconst UNPRINTABLE = /[\\p{Cf}\\p{Zl}\\p{Zp}]/u;\n\n/*\n * Decide whether decoded chain data is worth showing as text.\n *\n * A payload anyone can pay to publish must not steer a terminal, reorder the line that renders it,\n * or hide bytes behind characters nobody can see, because the CLI prints this text straight out.\n * Out of the C0 and C1 control blocks only tab and newline survive: real messages write paragraphs\n * with them, and the renderers indent a continuation line so it cannot pose as another field. The\n * trade is that a joiner carries meaning in Persian spelling and in emoji sequences, and those\n * payloads arrive as hex.\n */\nfunction isPrintable(text: string): boolean {\n if (UNPRINTABLE.test(text)) return false;\n\n for (const char of text) {\n const code = char.codePointAt(0) ?? 0;\n if (code < 0x20 && code !== 0x09 && code !== 0x0a) return false;\n if (code >= 0x7f && code <= 0x9f) return false;\n }\n\n return true;\n}\n\nfunction hexToBytes(hex: string): Uint8Array | undefined {\n if (hex.length % 2 !== 0 || !/^[0-9a-f]*$/i.test(hex)) return undefined;\n\n const bytes = new Uint8Array(hex.length / 2);\n for (let i = 0; i < bytes.length; i += 1) {\n bytes[i] = Number.parseInt(hex.slice(i * 2, i * 2 + 2), 16);\n }\n return bytes;\n}\n\nfunction toHex(bytes: Uint8Array): string {\n return Array.from(bytes, (byte) => byte.toString(16).padStart(2, \"0\")).join(\"\");\n}\n\n/* Read a little-endian push length. Callers check first that all `width` bytes are there. */\nfunction readPushLength(script: Uint8Array, offset: number, width: number): number {\n let length = 0;\n for (let i = 0; i < width; i += 1) {\n length += (script[offset + i] ?? 0) * 256 ** i;\n }\n return length;\n}\n\n/*\n * Value an opcode pushes on its own, for the small constants that carry no bytes after them.\n *\n * Nothing comes back for OP_RESERVED: Bitcoin Core counts it as push-type in `IsPushOnly`, yet it\n * leaves no data behind.\n */\nfunction constantPush(opcode: number): Uint8Array | undefined {\n if (opcode === OP_0) return new Uint8Array();\n if (opcode === OP_1NEGATE) return Uint8Array.of(0x81);\n if (opcode >= OP_1 && opcode <= OP_16) return Uint8Array.of(opcode - OP_1 + 1);\n return undefined;\n}\n\n/* Read a payload as text, leaving binary carriers (Runes, Omni, hashes) without a text reading. */\nfunction decodeText(payload: Uint8Array): string | undefined {\n try {\n const text = decoder().decode(payload);\n return isPrintable(text) ? text : undefined;\n } catch {\n return undefined;\n }\n}\n\nfunction toPayload(bytes: Uint8Array): OpReturnPayload {\n return { hex: toHex(bytes), text: decodeText(bytes) };\n}\n\nfunction dataPush(\n script: Uint8Array,\n cursor: number,\n opcode: number,\n): { readonly cursor: number; readonly length: number } | undefined {\n const width = PUSHDATA_WIDTH[opcode];\n if (width === undefined) return { cursor, length: opcode };\n if (cursor + width > script.length) return undefined;\n return { cursor: cursor + width, length: readPushLength(script, cursor, width) };\n}\n\n/*\n * Read the data pushes of an OP_RETURN output.\n *\n * Any other output yields nothing, and is rejected on the hex so a busy address does not pay to\n * decode thousands of ordinary scripts. The walk covers what Bitcoin Core calls push-only: an\n * opcode below OP_PUSHDATA1 is its own byte count, the small constants push themselves, and\n * anything above OP_16 or a truncated push ends the walk with whatever came before it.\n */\nfunction parseOpReturn(scriptHex: string): OpReturnPayload[] {\n if (!OP_RETURN_SCRIPT.test(scriptHex)) return [];\n\n const script = hexToBytes(scriptHex);\n if (!script) return [];\n\n const payloads: OpReturnPayload[] = [];\n let cursor = 1;\n\n while (cursor < script.length) {\n const opcode = script[cursor]!;\n cursor += 1;\n\n if (opcode > OP_16) break;\n if (opcode === OP_RESERVED) continue;\n\n const constant = constantPush(opcode);\n if (constant !== undefined) {\n payloads.push(toPayload(constant));\n continue;\n }\n\n const push = dataPush(script, cursor, opcode);\n if (!push || push.cursor + push.length > script.length) break;\n\n const payload = script.subarray(push.cursor, push.cursor + push.length);\n cursor = push.cursor + push.length;\n payloads.push(toPayload(payload));\n }\n\n return payloads;\n}\n\n/* Gather the OP_RETURN payloads of all outputs, or nothing when the transaction carries none. */\nfunction collectOpReturns(\n vout: readonly { readonly scriptpubkey?: string }[],\n): OpReturnPayload[] | undefined {\n const payloads = vout.flatMap((out) => (out.scriptpubkey ? parseOpReturn(out.scriptpubkey) : []));\n return payloads.length > 0 ? payloads : undefined;\n}\n\nfunction mempoolTimestamp(status: Readonly): string | undefined {\n return status.block_time ? new Date(status.block_time * 1000).toISOString() : undefined;\n}\n\nfunction peppoolHistoryPath(encodedAddress: string, encodedCursor: string): string {\n return `/api/address/${encodedAddress}/txs?after_txid=${encodedCursor}`;\n}\n\nfunction mempoolAddressTotals(\n raw: Readonly,\n address: string,\n): { readonly input: bigint; readonly output: bigint } {\n const input = raw.vin\n .filter((item) => item.prevout?.scriptpubkey_address === address)\n .reduce((sum, item) => sum + BigInt(item.prevout?.value ?? 0), 0n);\n const output = raw.vout\n .filter((item) => item.scriptpubkey_address === address)\n .reduce((sum, item) => sum + BigInt(item.value), 0n);\n return { input, output };\n}\n\nfunction mempoolSendingParties(\n raw: Readonly,\n address: string,\n): { readonly from: string; readonly to: string } {\n const sender = raw.vin.find((item) => item.prevout?.scriptpubkey_address === address);\n const recipient = selectEsploraRecipientOutput(raw.vout, address);\n return {\n from: sender?.prevout?.scriptpubkey_address ?? address,\n to: recipient.address ?? address,\n };\n}\n\nfunction mempoolAddressParties(\n raw: Readonly,\n address: string,\n isSend: boolean,\n): { readonly from: string; readonly to: string } {\n if (isSend) return mempoolSendingParties(raw, address);\n return { from: raw.vin[0]?.prevout?.scriptpubkey_address ?? \"unknown\", to: address };\n}\n\nfunction mapTx(raw: Readonly, address: string): Transaction {\n const totals = mempoolAddressTotals(raw, address);\n const netSat = totals.output - totals.input;\n const isSend = totals.input > 0n;\n const absoluteNetSat = netSat < 0n ? -netSat : netSat;\n const amount = isSend ? absoluteNetSat - BigInt(raw.fee) : netSat;\n const transferredSat = amount < 0n ? 0n : amount;\n const { from, to } = mempoolAddressParties(raw, address, isSend);\n\n return {\n hash: raw.txid,\n blockNumber: raw.status.block_height ?? 0,\n timestamp: mempoolTimestamp(raw.status),\n from,\n to: to ?? null,\n value: transferredSat.toString(),\n valueFormatted: satToCoin(transferredSat),\n fee: raw.fee.toString(),\n status: (raw.status.confirmed ? \"success\" : \"pending\") as TxStatus,\n isContractInteraction: false,\n tokenTransfers: [] as TokenTransfer[],\n opReturn: collectOpReturns(raw.vout),\n raw: raw as unknown as Record,\n };\n}\n\nexport class Mempool extends Provider {\n static readonly key = \"mempool\";\n\n private baseUrl: string | undefined;\n private defaultChain: ChainKey;\n\n constructor(config: Readonly) {\n super(config);\n this.baseUrl = config.baseUrl ? normalizeBaseUrl(config.baseUrl) : undefined;\n this.defaultChain = config.defaultChain ?? \"bitcoin\";\n }\n get capabilities(): ProviderCapabilities {\n return {\n balances: true,\n txHistory: true,\n txDetail: true,\n utxos: true,\n contractInfo: false,\n tokenBalances: false,\n tokenTransfers: false,\n gasData: true,\n blockInfo: true,\n };\n }\n\n /* Chain membership decides support; an explicit `baseUrl` then overrides the host. */\n private base(chain: ChainKey): string {\n const base = CHAIN_BASES[chain];\n if (!base) throw new UnsupportedChainError(chain, \"mempool\");\n return this.baseUrl ?? base;\n }\n\n private async api(chain: ChainKey, path: string): Promise {\n return this.getJSON(`${this.base(chain)}${path}`);\n }\n\n async getBalance(address: string, chain?: ChainKey): Promise {\n const c = chain ?? this.defaultChain;\n\n assertSafePathSegment(address, \"address\");\n const data = await this.api(\n c,\n `/api/address/${encodeURIComponent(address)}`,\n );\n\n const fundedSat = BigInt(data.chain_stats.funded_txo_sum);\n const spentSat = BigInt(data.chain_stats.spent_txo_sum);\n const balanceSat = fundedSat - spentSat;\n\n const unconfirmed = data.mempool_stats\n ? BigInt(data.mempool_stats.funded_txo_sum) - BigInt(data.mempool_stats.spent_txo_sum)\n : undefined;\n\n return this.snapshotBalance({\n ...(unconfirmed === undefined ? {} : { unconfirmed: unconfirmed.toString() }),\n address,\n chain: c,\n balance: balanceSat.toString(),\n balanceFormatted: satToCoin(balanceSat),\n funded: fundedSat.toString(),\n spent: spentSat.toString(),\n symbol: createChain(c).symbol,\n });\n }\n\n async getTxHistory(\n address: string,\n chain?: ChainKey,\n options?: Readonly,\n ): Promise {\n const c = chain ?? this.defaultChain;\n const transactions = await getEsploraAddressHistory(\n address,\n options?.limit,\n async (path) => this.api(c, path),\n c === \"pepecoin\" ? peppoolHistoryPath : undefined,\n );\n\n return transactions.map((tx) => mapTx(tx, address));\n }\n\n override async getUtxos(address: string, chain?: ChainKey): Promise {\n const c = chain ?? this.defaultChain;\n return getEsploraUtxos(address, async (path) => this.api(c, path));\n }\n\n override async getTxDetail(hash: string, chain?: ChainKey): Promise {\n const c = chain ?? this.defaultChain;\n\n assertSafePathSegment(hash, \"tx hash\");\n const data = await this.api(c, `/api/tx/${encodeURIComponent(hash)}`);\n\n const output = selectEsploraRecipientOutput(data.vout);\n const fromAddr = data.vin[0]?.prevout?.scriptpubkey_address ?? \"unknown\";\n\n return {\n hash: data.txid,\n blockNumber: data.status.block_height ?? 0,\n timestamp: mempoolTimestamp(data.status),\n from: fromAddr,\n to: output.address,\n value: output.value.toString(),\n valueFormatted: satToCoin(output.value),\n fee: data.fee.toString(),\n status: (data.status.confirmed ? \"success\" : \"pending\") as TxStatus,\n isContractInteraction: false,\n tokenTransfers: [],\n opReturn: collectOpReturns(data.vout),\n raw: data as unknown as Record,\n };\n }\n\n override async getGasData(chain?: ChainKey): Promise {\n const c = chain ?? this.defaultChain;\n if (c === \"pepecoin\") throw new UnsupportedOperationError(\"getGasData\", this.name);\n\n const fees = await this.api(c, \"/api/v1/fees/recommended\");\n\n return {\n chain: c,\n unit: FEE_UNITS[c] ?? \"sat/vB\",\n safeGasPrice: fees.economyFee.toString(),\n proposedGasPrice: fees.halfHourFee.toString(),\n fastGasPrice: fees.fastestFee.toString(),\n priorityFee: fees.minimumFee.toString(),\n };\n }\n\n override async getBlockInfo(blockNumber: number, chain?: ChainKey): Promise {\n const c = chain ?? this.defaultChain;\n if (c === \"pepecoin\") throw new UnsupportedOperationError(\"getBlockInfo\", this.name);\n\n assertSafePathSegment(String(blockNumber), \"block number\");\n const blocks = await this.api(\n c,\n `/api/blocks/${encodeURIComponent(String(blockNumber))}`,\n );\n const block = blocks.find((candidate) => candidate.height === blockNumber);\n if (!block) throw new NotFoundError(`Block ${blockNumber}`, \"mempool\");\n\n return {\n number: block.height,\n hash: block.id,\n parentHash: block.previousblockhash,\n timestamp: new Date(block.timestamp * 1000).toISOString(),\n miner: \"\",\n gasUsed: block.size.toString(),\n gasLimit: block.weight.toString(),\n txCount: block.tx_count,\n };\n 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