feat: OpenAPI docs & JS Client

Author: douglasgalico

.cspell/custom-dictionary.txt

@@ -17,3 +17,4 @@ Solana
 struct
 structs
 Unichain
+Redoc

README.md

@@ -162,6 +162,96 @@ The API spec (TBD) for the off-chain service should be adhered to by all Relay P
 
 Explorers should be updated to track execution requests and link to their designated provider via quoter address.
 
+## API Documentation
+
+The Messaging Executor provides HTTP APIs for interacting with the relay service. The API specification is defined using [TypeSpec](https://typespec.io/) and can be generated as OpenAPI documentation.
+
+### Building API Documentation
+
+```bash
+# Navigate to the api-docs directory
+cd api-docs
+
+# Install dependencies
+npm install
+
+# Compile TypeSpec to generate OpenAPI spec and JS client & models
+npm run compile
+# or
+tsp compile .
+```
+
+This will generate:
+
+- **OpenAPI Specification**: `tsp-output/schema/openapi.yaml`
+- **JavaScript Client & Models**: `tsp-output/clients/js/`
+
+### Viewing API Documentation
+
+After building, you can view the API documentation using:
+
+1. **Swagger Editor** (Online)
+   - Visit https://editor.swagger.io/
+   - Copy and paste the contents of `tsp-output/schema/openapi.yaml`
+
+2. **Redoc** (Online)
+   - Visit https://redocly.github.io/redoc/
+   - Upload your `openapi.yaml` file
+
+### API Endpoints
+
+The API provides three main endpoints:
+
+#### GET `/capabilities`
+
+Returns the capabilities for all supported chains, including:
+
+- Supported request prefixes (ERV1, ERN1, ERC1, ERC2)
+- Gas limits and message value limits
+- Supported destination chains
+
+#### POST `/quote`
+
+Generates a signed quote for cross-chain execution:
+
+- **Request**: Source chain, destination chain, optional relay instructions
+- **Response**: Signed quote and estimated cost
+
+#### POST `/status/tx`
+
+Retrieves the status of an execution request:
+
+- **Request**: Transaction hash and optional chain ID
+- **Response**: Relay transaction details including status, costs, and execution results
+
+### Using the JavaScript Client
+
+The generated JavaScript client can be used to interact with the API programmatically:
+
+```javascript
+// Import the generated client
+import { Client } from "./api-docs/tsp-output/clients/js";
+
+// Create a client instance
+const client = new Client({ baseUrl: "http://localhost:3000/v0" });
+
+// Get capabilities
+const capabilities = await client.capabilities.list();
+
+// Generate a quote
+const quote = await client.quote.create({
+  srcChain: 1,
+  dstChain: 2,
+  relayInstructions: "0x...",
+});
+
+// Check transaction status
+const status = await client.status.getTransaction({
+  txHash: "0x...",
+  chainId: 1,
+});
+```
+
 ### API / Database Schema
 
 #### Off-Chain Quote

api-docs/.gitignore

@@ -0,0 +1,9 @@
+# MacOS
+.DS_Store
+
+# Default TypeSpec output
+tsp-output/
+dist/
+
+# Dependency directories
+node_modules/

api-docs/main.tsp

@@ -0,0 +1,271 @@
+import "@typespec/http";
+import "@typespec/openapi";
+
+using Http;
+using OpenAPI;
+
+@service()
+@info(#{
+  title: "Messaging Executor API",
+  version: "1.0.0",
+})
+@server("http://localhost:3000/v0", "Local development server")
+namespace MessagingExecutor;
+
+// ============= Models =============
+
+model Capabilities {
+  @doc("Request prefixes enabled for given chain")
+  requestPrefixes: string[];
+
+  @doc("Gas Drop-off limit, native chain token bigint represented as string") 
+  gasDropOffLimit?: string;
+
+  @doc("Maximum Gas limit") 
+  maxGasLimit?: string;
+
+  @doc("Max message value, native chain token bigint represented as string") 
+  maxMsgValue?: string;
+}
+
+@doc("Object with chain IDs (Wormhole Chain ID) as keys and their capabilities as values")
+model CapabilitiesResponse is Record<Capabilities>;
+
+model QuoteRequest {
+  @doc("Source wormhole chain ID")
+  srcChain: int32;
+  
+  @doc("Destination wormhole chain ID")
+  dstChain: int32;
+  
+  @doc("Optional hex-encoded relay instructions for cost estimation")
+  relayInstructions?: string;
+}
+
+model QuoteResponse {
+  @doc("Hex-encoded signed quote")
+  signedQuote: string;
+  
+  @doc("Estimated cost in source chain native token units")
+  estimatedCost?: string;
+}
+
+model StatusRequest {
+  @doc("Wormhole chain ID for the transaction")
+  chainId?: int32;
+  
+  @doc("Transaction hash")
+  txHash: string;
+}
+
+model TxInfo {
+  @doc("Relayed transaction hash")
+  txHash: string;
+
+  @doc("Wormhole chain ID for the transaction")
+  chainId: int32;
+
+  @doc("Block number (or slot/epoch)")
+  blockNumber: string;
+
+  @doc("Block time as timestamp")
+  blockTime?: string;
+
+   @doc("Relay cost in native token units (wei/lamports/etc)")
+  cost: string;
+}
+
+model RequestForExecution {
+  @doc("Public key of Quoter")
+  quoterAddress: string;
+  
+  @doc("Amount paid for the relay in source chain native token")
+  amtPaid: string;
+  
+  @doc("Destination Wormhole chain ID")
+  dstChain: int32;
+  
+  @doc("Destination address to execute the transaction")
+  dstAddr: string;
+  
+  @doc("Refund address for excess payment")
+  refundAddr: string;
+  
+  @doc("Hex-encoded signed quote bytes")
+  signedQuoteBytes: string;
+  
+  @doc("Hex-encoded request bytes")
+  requestBytes: string;
+  
+  @doc("Hex-encoded relay instruction bytes")
+  relayInstructionsBytes: string;
+  
+  @doc("Timestamp when the request was created")
+  timestamp: string;
+}
+
+model SignedQuote {
+  @doc("Quote details")
+  quote: {
+    @doc("Quote prefix identifier (e.g., 'EQ01')")
+    prefix: string;
+    
+    @doc("Address of the quoter providing the quote")
+    quoterAddress: string;
+    
+    @doc("Address that will receive payment")
+    payeeAddress: string;
+    
+    @doc("Source Wormhole chain ID")
+    srcChain: int32;
+    
+    @doc("Destination Wormhole chain ID")
+    dstChain: int32;
+    
+    @doc("Quote expiration time")
+    expiryTime: string;
+    
+    @doc("Base fee for the relay")
+    baseFee: string;
+    
+    @doc("Gas price on destination chain")
+    dstGasPrice: string;
+    
+    @doc("Source chain token price")
+    srcPrice: string;
+    
+    @doc("Destination chain token price")
+    dstPrice: string;
+  };
+  
+  @doc("Cryptographic signature of the quote")
+  signature?: string;
+}
+
+// Request instruction variants based on prefix
+model ERV1Request {
+  @doc("Request prefix identifier")
+  prefix: "ERV1";
+  
+  @doc("Chain ID")
+  chain: int32;
+  
+  @doc("Contract address")
+  address: string;
+  
+  @doc("Sequence number")
+  sequence: string;
+}
+
+model ERN1Request {
+  @doc("Request prefix identifier")
+  prefix: "ERN1";
+  
+  @doc("Source chain ID")
+  srcChain: int32;
+  
+  @doc("Source manager address")
+  srcManager: string;
+  
+  @doc("Message identifier")
+  messageId: string;
+}
+
+model ERC1Request {
+  @doc("Request prefix identifier")
+  prefix: "ERC1";
+  
+  @doc("Source domain")
+  sourceDomain: int32;
+  
+  @doc("Nonce value")
+  nonce: string;
+}
+
+model ERC2Request {
+  @doc("Request prefix identifier")
+  prefix: "ERC2";
+  
+  @doc("CCTP V2 request configuration")
+  cctpV2Request: {
+    @doc("CCTP V2 request prefix mode")
+    cctpV2RequestPrefix: string;
+  };
+}
+
+@doc("Request instruction details that vary by prefix type")
+model RequestInstruction {
+  @doc("The request details, structure depends on the prefix type")
+  request: ERV1Request | ERN1Request | ERC1Request | ERC2Request;
+}
+
+model RelayTransaction {
+  @doc("Wormhole chain ID where the transaction originated")
+  chainId: int32;
+  
+  @doc("Estimated cost for the relay in source chain native token")
+  estimatedCost: string;
+  
+  @doc("Unique identifier for the relay transaction")
+  id: string;
+  
+  @doc("Timestamp when the transaction was indexed")
+  indexedAt: string;
+  
+  @doc("Parsed relay instruction details")
+  instruction?: RequestInstruction;
+  
+  @doc("Original request for execution details")
+  requestForExecution: RequestForExecution;
+  
+  @doc("Signed quote used for this transaction")
+  signedQuote: SignedQuote;
+  
+  @doc("Current status of the relay (pending, submitted, failed, etc.)")
+  status: string;
+  
+  @doc("Original transaction hash")
+  txHash: string;
+  
+  @doc("Reason for failure if status is 'failed'")
+  failureCause?: string;
+  
+  @doc("List of destination chain transactions executed")
+  txs?: TxInfo[];
+}
+
+@error
+model ErrorResponse {
+  message: string;
+  statusCode?: int32;
+}
+
+// ============= Interfaces =============
+
+@route("/capabilities")
+@tag("Capabilities")
+interface CapabilitiesInterface {
+  @summary("Get capabilities for all supported chains")
+  @doc("Retrieves the supported features and capabilities for all supported blockchains (as wormhole chain ID)")
+  @get
+  list(): CapabilitiesResponse | ErrorResponse;
+}
+
+@route("/quote")
+@tag("Quote")
+interface QuoteInterface {
+  @summary("Generate a quote for cross-chain transaction")
+  @doc("Provides a signed quote for cross-chain relay with optional cost estimation")
+  @post
+  create(@body body: QuoteRequest): QuoteResponse | ErrorResponse;
+}
+
+@route("/status")
+@tag("Status")
+interface StatusInterface {
+  @summary("Get status of a transaction")
+  @doc("Retrieves the status of a request for execution transaction and potentially initiates processing (when first time statusing and chain ID provided)")
+  @route("tx")
+  @post
+  getTransaction(@body body: StatusRequest): RelayTransaction[] | ErrorResponse;
+}