feat/er/add-limo-examples (#496)

* add code examples to construct svm bids

* update permanent links

Author: anihamde

pages/express-relay/integrate-as-searcher/svm.mdx

@@ -8,7 +8,7 @@ SVM Express Relay searchers fulfill opportunities representing limit orders on t
 
 ### Subscribe to New Opportunities
 
-Express Relay provides searchers with [Typescript](https://github.com/pyth-network/per/tree/8e311d3dce7a54865ff98b25e57c6af2dd984d1f/sdk/js) and [Python](https://github.com/pyth-network/per/tree/8e311d3dce7a54865ff98b25e57c6af2dd984d1f/sdk/python) SDKs to interact with Express Relay.
+Express Relay provides searchers with [Typescript](https://github.com/pyth-network/per/tree/4be711525948cf24c0ebd4ebab007dc7f51b7069/sdk/js) and [Python](https://github.com/pyth-network/per/tree/4be711525948cf24c0ebd4ebab007dc7f51b7069/sdk/python) SDKs to interact with Express Relay.
 Searchers can also directly fetch available opportunities via HTTP or subscribe to them via WebSocket.
 
 <Tabs items={['Typescript', 'Python', 'HTTP', 'Websocket']}>
@@ -100,20 +100,119 @@ The server responds with opportunities in the following format:
 ### Construct the Bid
 
 Searchers should construct a bid by evaluating the fetched opportunity.
-The SDKs provide an easy way to construct a bid; refer to these basic examples in [Typescript](https://github.com/pyth-network/per/blob/0bd47e39d704c4b19b596512e4be05db4f715e58/sdk/js/src/examples/simpleSearcherLimo.ts#L75) and [Python](https://github.com/pyth-network/per/blob/0bd47e39d704c4b19b596512e4be05db4f715e58/sdk/python/express_relay/searcher/examples/simple_searcher_svm.py#L110).
 
 <Callout type="warning" emoji="⚠️">
-  Before constructing the bid, make sure your wallet has the required assets.
+  Before constructing the bid, make sure your wallet has the required assets to
+  fulfill the limit order and SOL to pay the bid amount.
 </Callout>
 
-The bid you construct will look like
+See the following examples of how to construct a bid object via the SDKs:
 
+<Tabs items={['Typescript', 'Python']}>
+<Tabs.Tab>
+Below is an excerpt of example code. See the full example in the [Typescript SDK](https://github.com/pyth-network/per/blob/4be711525948cf24c0ebd4ebab007dc7f51b7069/sdk/js/src/examples/simpleSearcherLimo.ts).
+
+```typescript copy
+import { OpportunitySvm } from "../index";
+import { BidSvm } from "../types";
+
+import * as anchor from "@coral-xyz/anchor";
+import * as limo from "@kamino-finance/limo-sdk";
+
+/**
+  * Generates a bid for a given opportunity. The transaction in this bid transfers assets from the searcher's wallet to fulfill the limit order.
+  * @param opportunity The SVM opportunity to bid on
+  * @returns The generated bid object
+  */
+async generateBid(opportunity: OpportunitySvm): Promise<BidSvm> {
+    const order = opportunity.order;
+    const limoClient = new limo.LimoClient(
+      this.connectionSvm,
+      order.state.globalConfig
+    );
+
+    const ixsTakeOrder = await this.generateTakeOrderIxs(limoClient, order);
+    const txRaw = new anchor.web3.Transaction().add(...ixsTakeOrder);
+
+    const bidData = await this.getBidData(limoClient, order);
+
+    const bid = await this.client.constructSvmBid(
+      txRaw,
+      this.searcher.publicKey,
+      bidData.router,
+      order.address,
+      bidData.bidAmount,
+      new anchor.BN(Math.round(Date.now() / 1000 + DAY_IN_SECONDS)),
+      this.chainId,
+      bidData.relayerSigner,
+      bidData.relayerFeeReceiver
+    );
+
+    bid.transaction.recentBlockhash = this.recentBlockhash[this.chainId];
+    bid.transaction.sign(this.searcher);
+    return bid;
+}
 ```
+
+</Tabs.Tab>
+<Tabs.Tab>
+Below is an excerpt of example code. See the full example in the [Python SDK](https://github.com/pyth-network/per/blob/4be711525948cf24c0ebd4ebab007dc7f51b7069/sdk/python/express_relay/searcher/examples/simple_searcher_svm.py).
+
+```python copy
+import logging
+
+from solders.transaction import Transaction
+
+from express_relay.models.svm import BidSvm
+from express_relay.svm.limo_client import OrderStateAndAddress
+
+DEADLINE = 2**62
+logger = logging.getLogger(__name__)
+
+async def assess_opportunity(self, opp: OpportunitySvm) -> BidSvm | None:
+    """
+    Method to assess an opportunity and return a bid if the opportunity is worth taking. This method always returns a bid for any valid opportunity. The transaction in this bid transfers assets from the searcher's wallet to fulfill the limit order.
+
+    Args:
+        opp: An object representing a single opportunity.
+    Returns:
+        A bid object if the opportunity is worth taking to be submitted to the Express Relay server, otherwise None.
+    """
+    order: OrderStateAndAddress = {"address": opp.order_address, "state": opp.order}
+    ixs_take_order = await self.generate_take_order_ixs(order)
+    bid_data = await self.get_bid_data(order)
+
+    submit_bid_ix = self.client.get_svm_submit_bid_instruction(
+        searcher=self.private_key.pubkey(),
+        router=bid_data.router,
+        permission_key=order["address"],
+        bid_amount=bid_data.bid_amount,
+        deadline=DEADLINE,
+        chain_id=self.chain_id,
+        fee_receiver_relayer=bid_data.relayer_fee_receiver,
+        relayer_signer=bid_data.relayer_signer,
+    )
+    transaction = Transaction.new_with_payer(
+        [submit_bid_ix] + ixs_take_order, self.private_key.pubkey()
+    )
+    transaction.partial_sign(
+        [self.private_key], recent_blockhash=self.recent_blockhash[self.chain_id]
+    )
+    bid = BidSvm(transaction=transaction, chain_id=self.chain_id)
+    return bid
+```
+
+</Tabs.Tab>
+</Tabs>
+
+The bid you construct will look like
+
+```json
 {
   // serialized transaction object, in base-64 encoding
-  transaction: "SGVsbG8sIFdvcmxkIQ==",
-  chain_id: "solana",
-  env: "svm"
+  "transaction": "SGVsbG8sIFdvcmxkIQ==",
+  "chain_id": "solana",
+  "env": "svm"
 }
 ```