feat(chain): Arweave integration

chain/arweave.ts

@@ -0,0 +1,79 @@
+import '../common/eager_offset'
+import { Bytes } from '..'
+
+// Most types from this namespace are direct mappings or adaptations from:
+// https://github.com/ChainSafe/firehose-arweave/blob/master/proto/sf/arweave/type/v1/type.proto
+export namespace arweave {
+  /**
+   * A key-value pair for arbitrary metadata
+   */
+  export class Tag {
+    constructor(public name: Bytes, public value: Bytes) {}
+  }
+
+  export class ProofOfAccess {
+    constructor(
+      public option: string,
+      public txPath: Bytes,
+      public dataPath: Bytes,
+      public chunk: Bytes,
+    ) {}
+  }
+
+  /**
+   * An Arweave block.
+   */
+  export class Block {
+    constructor(
+      public timestamp: u64,
+      public lastRetarget: u64,
+      public height: u64,
+      public indepHash: Bytes,
+      public nonce: Bytes,
+      public previousBlock: Bytes,
+      public diff: Bytes,
+      public hash: Bytes,
+      public txRoot: Bytes,
+      public txs: Bytes[],
+      public walletList: Bytes,
+      public rewardAddr: Bytes,
+      public tags: Tag[],
+      public rewardPool: Bytes,
+      public weaveSize: Bytes,
+      public blockSize: Bytes,
+      public cumulativeDiff: Bytes,
+      public hashListMerkle: Bytes,
+      public poa: ProofOfAccess,
+    ) {}
+  }
+
+  /**
+   * An Arweave transaction
+   */
+  export class Transaction {
+    constructor(
+      public format: u32,
+      public id: Bytes,
+      public lastTx: Bytes,
+      public owner: Bytes,
+      public tags: Tag[],
+      public target: Bytes,
+      public quantity: Bytes,
+      public data: Bytes,
+      public dataSize: Bytes,
+      public dataRoot: Bytes,
+      public signature: Bytes,
+      public reward: Bytes,
+    ) {}
+  }
+
+  /**
+   * An Arweave transaction with block ptr
+   */
+  export class TransactionWithBlockPtr {
+    constructor(
+      public tx: Transaction,
+      public block: Block,
+    ) {}
+  }
+}

global/global.ts

@@ -8,6 +8,7 @@ import {
   Wrapped,
 } from '../common/collections'
 import { JSONValue, Value } from '../common/value'
+import { arweave } from '../chain/arweave'
 import { ethereum } from '../chain/ethereum'
 import { near } from '../chain/near'
 import { tendermint } from '../chain/tendermint'
@@ -201,7 +202,25 @@ export enum TypeId {
   ```
   */
 
-  // Reserved discriminant space for a future blockchain type IDs: [2,500, 3,499]
+  // Reserved discriminant space for Tendermint type IDs: [2,500, 3,499]
+  ArweaveBlock = 2500,
+  ArweaveProofOfAccess = 2501,
+  ArweaveTag = 2502,
+  ArweaveTagArray = 2503,
+  ArweaveTransaction = 2504,
+  ArweaveTransactionArray = 2505,
+  ArweaveTransactionWithBlockPtr = 2506,
+  /*
+  Continue to add more Arweave type IDs here. e.g.:
+  ```
+  NextArweaveType = 1547,
+  AnotherArweaveType = 1547,
+  ...
+  LastArweaveType = 2499,
+  ```
+  */
+
+  // Reserved discriminant space for a future blockchain type IDs: [3,500, 4,499]
 }
 
 export function id_of_type(typeId: TypeId): usize {
@@ -483,6 +502,20 @@ export function id_of_type(typeId: TypeId): usize {
       return idof<Array<Uint8Array>>()
     case TypeId.ArrayLog:
       return idof<Array<ethereum.Log>>()
+    case TypeId.ArweaveBlock:
+      return idof<arweave.Block>()
+    case TypeId.ArweaveProofOfAccess:
+      return idof<arweave.ProofOfAccess>()
+    case TypeId.ArweaveTag:
+      return idof<arweave.Tag>()
+    case TypeId.ArweaveTagArray:
+      return idof<Array<arweave.Tag>>()
+    case TypeId.ArweaveTransaction:
+      return idof<arweave.Transaction>()
+    case TypeId.ArweaveTransactionArray:
+      return idof<Array<arweave.Transaction>>()
+    case TypeId.ArweaveTransactionWithBlockPtr:
+      return idof<arweave.TransactionWithBlockPtr>()
     default:
       return 0
   }

index.ts

@@ -1,5 +1,7 @@
 // Side-effect to evaluate eagerly the offset of stub AS runtime
 import './common/eager_offset'
+// Arweave support
+export * from './chain/arweave'
 // Ethereum support
 export * from './chain/ethereum'
 // NEAR support