pump-parser/internal/example/geyser/pump.go

package geyser

import (
	"fmt"

	"github.com/shopspring/decimal"
	types "github.com/thloyi/pump-parser"
)

type PumpHandler struct {
	callback func(*types.Tx)
}

func NewPumpHandler(cb func(*types.Tx)) *PumpHandler {
	return &PumpHandler{
		callback: func(tx *types.Tx) {
			//tx.Check(tx2)
			cb(tx)
		},
	}
}

func (h *PumpHandler) HandleMessage(rawTx *types.RawTx) {
	if rawTx.Meta.Err != nil {
		// Notify the channel about the failed transaction
		beforeSolBalance := decimal.Zero
		afterSolBalance := decimal.Zero
		if rawTx.Meta.PreBalances != nil && len(rawTx.Meta.PreBalances) > 0 {
			beforeSolBalance = decimal.NewFromUint64(rawTx.Meta.PreBalances[0]).Div(decimal.NewFromInt(1e9))
		}
		if rawTx.Meta.PostBalances != nil && len(rawTx.Meta.PostBalances) > 0 {
			afterSolBalance = decimal.NewFromUint64(rawTx.Meta.PostBalances[0]).Div(decimal.NewFromInt(1e9))
		}
		h.callback(&types.Tx{
			TxHash:     (*[64]byte)((rawTx.Transaction.Signatures[0][:])),
			Err:        rawTx.Meta.Err,
			Signer:     rawTx.GetSigner(),
			Block:      rawTx.Slot,
			BlockIndex: uint64(rawTx.IndexWithinBlock),

			BeforeSolBalance: beforeSolBalance,
			AfterSOLBalance:  afterSolBalance,
		})
		return
	}

	var parsedTx = &types.Tx{}
	parsedTx.SetRawTx(rawTx)
	err := parsedTx.Parser()
	if err != nil {
		fmt.Printf("parser error: %s,  block: %d tx: %s\n", err, rawTx.Slot, rawTx.TxHash())
		return
	}
	if len(parsedTx.Swaps) == 0 {
		// no swap, ignore
		return
	}
	// fmt.Println(parsedTx.GetTxHash(), len(parsedTx.Swaps))
	if h.callback != nil {
		h.callback(parsedTx)
	}
}