@rarimo/swap/src/swappers/evm/evm-swapper.ts

Internal tools that other Rarimo packages use to swap tokens.

import { extend, ref, toRaw } from '@distributedlab/reactivity'
import { createBridger, createEVMBridger } from '@rarimo/bridge'
import type { IProvider } from '@rarimo/provider'

import type { ExecuteArgs, Swapper } from '@/types'

import { getExecuteData } from './execute-data'

/**
 * @description Instead of using this function directly, run token swaps as transactions with the [@rarimo/nft-checkout]() package.
 * For more information about swaps, see [Swapping tokens](https://docs.rarimo.com/overview/swapping-tokens) in the Rarimo documentation.
 */
export const createEVMSwapper = (provider: IProvider): Swapper => {
  const bridger = createBridger(createEVMBridger, provider)
  const isInitialized = ref(false)

  const init = async () => {
    if (isInitialized.value) return
    await bridger.init()
    isInitialized.value = true
  }

  const execute = async (args: ExecuteArgs) => {
    await init()
    await approveMultipleIfNeeded(args)

    return provider.signAndSendTx({
      from: provider.address,
      to: args.chainFrom.contractAddress,
      data: getExecuteData({
        ...args,
        receiver: args.receiver || provider.address,
      }),
      value: args.swapOpts.find(i => i.from.isNative)?.amountIn?.value,
    })
  }

  const approveMultipleIfNeeded = async (executeArgs: ExecuteArgs) => {
    for (const arg of executeArgs.swapOpts) {
      const { from, amountIn } = arg
      await bridger.approveIfNeeded(from, from.chain.contractAddress, amountIn)
    }
  }

  return toRaw(
    extend(
      {
        bridger,
        isInitialized,
        init,
        execute,
      },
      bridger,
    ),
  )
}