@kamino-finance/kliquidity-sdk
Version:
Typescript SDK for interacting with the Kamino Liquidity (kliquidity) protocol
117 lines (99 loc) • 3.15 kB
text/typescript
/* eslint-disable @typescript-eslint/no-unused-vars */
import {
address,
Address,
fetchEncodedAccount,
fetchEncodedAccounts,
GetAccountInfoApi,
GetMultipleAccountsApi,
Rpc,
} from "@solana/kit"
/* eslint-enable @typescript-eslint/no-unused-vars */
import BN from "bn.js" // eslint-disable-line @typescript-eslint/no-unused-vars
import * as borsh from "@coral-xyz/borsh" // eslint-disable-line @typescript-eslint/no-unused-vars
import { borshAddress } from "../utils" // eslint-disable-line @typescript-eslint/no-unused-vars
import * as types from "../types" // eslint-disable-line @typescript-eslint/no-unused-vars
import { PROGRAM_ID } from "../programId"
export interface FeeTierFields {
whirlpoolsConfig: Address
tickSpacing: number
defaultFeeRate: number
}
export interface FeeTierJSON {
whirlpoolsConfig: string
tickSpacing: number
defaultFeeRate: number
}
export class FeeTier {
readonly whirlpoolsConfig: Address
readonly tickSpacing: number
readonly defaultFeeRate: number
static readonly discriminator = Buffer.from([
56, 75, 159, 76, 142, 68, 190, 105,
])
static readonly layout = borsh.struct<FeeTier>([
borshAddress("whirlpoolsConfig"),
borsh.u16("tickSpacing"),
borsh.u16("defaultFeeRate"),
])
constructor(fields: FeeTierFields) {
this.whirlpoolsConfig = fields.whirlpoolsConfig
this.tickSpacing = fields.tickSpacing
this.defaultFeeRate = fields.defaultFeeRate
}
static async fetch(
rpc: Rpc<GetAccountInfoApi>,
address: Address,
programId: Address = PROGRAM_ID
): Promise<FeeTier | null> {
const info = await fetchEncodedAccount(rpc, address)
if (!info.exists) {
return null
}
if (info.programAddress !== programId) {
throw new Error("account doesn't belong to this program")
}
return this.decode(Buffer.from(info.data))
}
static async fetchMultiple(
rpc: Rpc<GetMultipleAccountsApi>,
addresses: Address[],
programId: Address = PROGRAM_ID
): Promise<Array<FeeTier | null>> {
const infos = await fetchEncodedAccounts(rpc, addresses)
return infos.map((info) => {
if (!info.exists) {
return null
}
if (info.programAddress !== programId) {
throw new Error("account doesn't belong to this program")
}
return this.decode(Buffer.from(info.data))
})
}
static decode(data: Buffer): FeeTier {
if (!data.slice(0, 8).equals(FeeTier.discriminator)) {
throw new Error("invalid account discriminator")
}
const dec = FeeTier.layout.decode(data.slice(8))
return new FeeTier({
whirlpoolsConfig: dec.whirlpoolsConfig,
tickSpacing: dec.tickSpacing,
defaultFeeRate: dec.defaultFeeRate,
})
}
toJSON(): FeeTierJSON {
return {
whirlpoolsConfig: this.whirlpoolsConfig,
tickSpacing: this.tickSpacing,
defaultFeeRate: this.defaultFeeRate,
}
}
static fromJSON(obj: FeeTierJSON): FeeTier {
return new FeeTier({
whirlpoolsConfig: address(obj.whirlpoolsConfig),
tickSpacing: obj.tickSpacing,
defaultFeeRate: obj.defaultFeeRate,
})
}
}