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Update QueryApi nft-indexer #1605

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Nov 30, 2023
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Update QueryApi nft-indexer #1605

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c4d8d4e
Update nft-indexer.md
bucanero Nov 30, 2023
fbe2b71
Update nft-indexer.md
bucanero Nov 30, 2023
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69 changes: 27 additions & 42 deletions docs/bos/tutorial/indexer-tutorials/nft-indexer.md
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Original file line number Diff line number Diff line change
Expand Up @@ -77,62 +77,47 @@ The first part of the logic is to filter blockchain transactions for a specific
The `getBlock` function for this NFT indexer looks like this:

```js
import { Block } from "@near-lake/primitives";

async function getBlock(block: Block) {

const h = block.header().height;
const createdOn = block.streamerMessage.block.header.timestamp;

for (let r of block.receipts()) {
// check if we have events
if (!r.events.length) continue;
for (let ev of block.events()) {
const r = block.actionByReceiptId(ev.relatedReceiptId);
const createdOn = block.streamerMessage.block.header.timestamp;

for (let log of r.logs) {
// check if logs follow the Events format
if (!log.match(/^EVENT_JSON:(.*)$/)) continue;
try {
let event = ev.rawEvent;

try {
// parse the JSON Event
let event = JSON.parse(log.substring(log.indexOf(":") + 1));
if (event.standard === "nep171" && event.event === "nft_mint") {
console.log(event);

// check if it's a NEP-171 NFT minting
if (event.standard === "nep171" && event.event === "nft_mint") {
console.log(r.receiverId);
console.log(event);
let marketplace = "unknown";
if (r.receiverId.endsWith(".paras.near"))
marketplace = "Paras";
else if (r.receiverId.endsWith(".sharddog.near"))
marketplace = "ShardDog";
else if (r.receiverId.match(/\.mintbase\d+\.near$/))
marketplace = "Mintbase";

// identify the NFT marketplace
let marketplace = "unknown";
if (r.receiverId.endsWith(".paras.near"))
marketplace = "Paras";
else if (r.receiverId.endsWith(".sharddog.near"))
marketplace = "ShardDog";
else if (r.receiverId.match(/\.mintbase\d+\.near$/))
marketplace = "Mintbase";
const nftMintData = {
marketplace: marketplace,
block_height: block.header().height,
block_timestamp: createdOn,
receipt_id: r.receiptId,
receiver_id: r.receiverId,
nft_data: JSON.stringify(event.data),
};

const nftMintData = {
marketplace: marketplace,
block_height: h,
block_timestamp: createdOn,
receipt_id: r.receiptId,
receiver_id: r.receiverId,
nft_data: JSON.stringify(event.data),
};

// store result to the database
await context.db.Nfts.insert(nftMintData);
await context.db.Nfts.insert(nftMintData);

console.log(`NFT by ${r.receiptId} has been added to the database`);
}
} catch (e) {
console.log(e);
console.log(`NFT by ${r.receiptId} has been added to the database`);
}
} catch (e) {
console.log(e);
}
}
}
```

This filter selects receipts that have events of type `nft_mint` and standard `nep171`. In addition, it parses the JSON event data and identifies the NFT marketplace.
This indexer filters [Blocks](https://near.github.io/near-lake-framework-js/classes/block.Block.html) that have [Events](https://near.github.io/near-lake-framework-js/classes/events.Event.html) of type `nft_mint` and standard `nep171`. In addition, it stores the JSON event data and identifies the NFT marketplace.

### Saving the data to the Database

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