Add encode logic to rest client

packages/sdk/src/restclient.ts

@@ -1,7 +1,7 @@
 import { Encoding } from "@iov/encoding";
 import axios, { AxiosInstance } from "axios";
 
-import { AminoTx, BaseAccount, isAminoStdTx } from "./types";
+import { AminoTx, BaseAccount, isAminoStdTx, StdTx } from "./types";
 
 const { fromUtf8 } = Encoding;
 
@@ -66,13 +66,19 @@ interface PostTxsResponse {
   readonly raw_log?: string;
 }
 
+interface EncodeTxResponse {
+  // base64-encoded amino-binary encoded representation
+  readonly tx: string;
+}
+
 type RestClientResponse =
   | NodeInfoResponse
   | BlocksResponse
   | AuthAccountsResponse
   | TxsResponse
   | SearchTxsResponse
-  | PostTxsResponse;
+  | PostTxsResponse
+  | EncodeTxResponse;
 
 type BroadcastMode = "block" | "sync" | "async";
 
@@ -133,6 +139,15 @@ export class RestClient {
     return responseData as BlocksResponse;
   }
 
+  // encodeTx returns the amino-encoding of the transaction
+  public async encodeTx(tx: StdTx): Promise<Uint8Array> {
+    const responseData = await this.post("/txs/encode", tx);
+    if (!(responseData as any).tx) {
+      throw new Error("Unexpected response data format");
+    }
+    return Encoding.fromBase64((responseData as EncodeTxResponse).tx);
+  }
+
   public async authAccounts(address: string, height?: string): Promise<AuthAccountsResponse> {
     const path =
       height === undefined ? `/auth/accounts/${address}` : `/auth/accounts/${address}?tx.height=${height}`;

packages/sdk/types/restclient.d.ts

@@ -1,4 +1,4 @@
-import { AminoTx, BaseAccount } from "./types";
+import { AminoTx, BaseAccount, StdTx } from "./types";
 interface NodeInfo {
   readonly network: string;
 }
@@ -50,13 +50,17 @@ interface PostTxsResponse {
   readonly code?: number;
   readonly raw_log?: string;
 }
+interface EncodeTxResponse {
+  readonly tx: string;
+}
 declare type RestClientResponse =
   | NodeInfoResponse
   | BlocksResponse
   | AuthAccountsResponse
   | TxsResponse
   | SearchTxsResponse
-  | PostTxsResponse;
+  | PostTxsResponse
+  | EncodeTxResponse;
 declare type BroadcastMode = "block" | "sync" | "async";
 export declare class RestClient {
   private readonly client;
@@ -67,6 +71,7 @@ export declare class RestClient {
   nodeInfo(): Promise<NodeInfoResponse>;
   blocksLatest(): Promise<BlocksResponse>;
   blocks(height: number): Promise<BlocksResponse>;
+  encodeTx(tx: StdTx): Promise<Uint8Array>;
   authAccounts(address: string, height?: string): Promise<AuthAccountsResponse>;
   txs(query: string): Promise<SearchTxsResponse>;
   txsById(id: string): Promise<TxsResponse>;

packages/sdk/types/types.d.ts

@@ -8,6 +8,10 @@ export interface StdTx {
   readonly signatures: ReadonlyArray<StdSignature>;
   readonly memo: string | undefined;
 }
+export declare type AminoTx = Tx & {
+  readonly value: StdTx;
+};
+export declare function isAminoStdTx(txValue: unknown): txValue is StdTx;
 export interface Msg {
   readonly type: string;
   readonly value: MsgSend | unknown;
@@ -44,7 +48,3 @@ export interface BaseAccount {
   readonly account_number: string;
   readonly sequence: string;
 }
-export declare type AminoTx = Tx & {
-  readonly value: StdTx;
-};
-export declare function isAminoStdTx(txValue: unknown): txValue is StdTx;