@marinade.finance/kamino-sdk/src/whirpools-client/accounts/TickArray.ts

Kamino SDK

import { PublicKey, Connection } from '@solana/web3.js';
import BN from 'bn.js'; // eslint-disable-line @typescript-eslint/no-unused-vars
import * as borsh from '@project-serum/borsh'; // eslint-disable-line @typescript-eslint/no-unused-vars
import * as types from '../types'; // eslint-disable-line @typescript-eslint/no-unused-vars
import { WHIRLPOOL_PROGRAM_ID } from '../programId';

export interface TickArrayFields {
  startTickIndex: number;
  ticks: Array<types.TickFields>;
  whirlpool: PublicKey;
}

export interface TickArrayJSON {
  startTickIndex: number;
  ticks: Array<types.TickJSON>;
  whirlpool: string;
}

export class TickArray {
  readonly startTickIndex: number;
  readonly ticks: Array<types.Tick>;
  readonly whirlpool: PublicKey;

  static readonly discriminator = Buffer.from([69, 97, 189, 190, 110, 7, 66, 187]);

  static readonly layout = borsh.struct([
    borsh.i32('startTickIndex'),
    borsh.array(types.Tick.layout(), 88, 'ticks'),
    borsh.publicKey('whirlpool'),
  ]);

  constructor(fields: TickArrayFields) {
    this.startTickIndex = fields.startTickIndex;
    this.ticks = fields.ticks.map((item) => new types.Tick({ ...item }));
    this.whirlpool = fields.whirlpool;
  }

  static async fetch(c: Connection, address: PublicKey): Promise<TickArray | null> {
    const info = await c.getAccountInfo(address);

    if (info === null) {
      return null;
    }
    if (!info.owner.equals(WHIRLPOOL_PROGRAM_ID)) {
      throw new Error("account doesn't belong to this program");
    }

    return this.decode(info.data);
  }

  static async fetchMultiple(c: Connection, addresses: PublicKey[]): Promise<Array<TickArray | null>> {
    const infos = await c.getMultipleAccountsInfo(addresses);

    return infos.map((info) => {
      if (info === null) {
        return null;
      }
      if (!info.owner.equals(WHIRLPOOL_PROGRAM_ID)) {
        throw new Error("account doesn't belong to this program");
      }

      return this.decode(info.data);
    });
  }

  static decode(data: Buffer): TickArray {
    if (!data.slice(0, 8).equals(TickArray.discriminator)) {
      throw new Error('invalid account discriminator');
    }

    const dec = TickArray.layout.decode(data.slice(8));

    return new TickArray({
      startTickIndex: dec.startTickIndex,
      ticks: dec.ticks.map((item: any /* eslint-disable-line @typescript-eslint/no-explicit-any */) =>
        types.Tick.fromDecoded(item)
      ),
      whirlpool: dec.whirlpool,
    });
  }

  toJSON(): TickArrayJSON {
    return {
      startTickIndex: this.startTickIndex,
      ticks: this.ticks.map((item) => item.toJSON()),
      whirlpool: this.whirlpool.toString(),
    };
  }

  static fromJSON(obj: TickArrayJSON): TickArray {
    return new TickArray({
      startTickIndex: obj.startTickIndex,
      ticks: obj.ticks.map((item) => types.Tick.fromJSON(item)),
      whirlpool: new PublicKey(obj.whirlpool),
    });
  }
}