chain link parser

chainlink.go

@@ -0,0 +1,120 @@
+package pump_parser
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"math/big"
+
+	"github.com/gagliardetto/solana-go"
+	"github.com/shopspring/decimal"
+)
+
+var (
+	chainlinkSOLUSDFeedAccount   = solana.MustPublicKeyFromBase58("CH31Xns5z3M1cTAbKW34jcxPPciazARpijcHj9rxtemt")
+	chainlinkSubmitDiscriminator = calculateDiscriminator("global:submit")
+)
+
+func chainLinkParser(tx *Tx, instruction Instruction, inners InnerInstructions, offset [2]uint) ([2]uint, error) {
+	if !tx.rawTx.accountList[instruction.ProgramIDIndex].Equals(chainLinkProgram) {
+		return increaseOffset(offset), fmt.Errorf("system program instruction not found, block: %d, tx: %s, outerIndex: %d, innerIndex: %d", tx.rawTx.Slot, tx.rawTx.TxHash(), offset[0], offset[1])
+	}
+	if tx.rawTx.Meta.Err != nil {
+		return increaseOffset(offset), nil
+	}
+
+	decode := instruction.Data
+	discriminator := binary.LittleEndian.Uint32(decode[0:4])
+
+	switch discriminator {
+	case transferDiscriminator:
+		return chainLinkSubmitParser(instruction, inners, offset, tx, decode[4:])
+	default:
+		return increaseOffset(offset), nil
+	}
+}
+
+func chainLinkSubmitParser(instruction Instruction, inners InnerInstructions, offset [2]uint, tx *Tx, decodeData []byte) ([2]uint, error) {
+	if len(instruction.Accounts) < 6 {
+		return increaseOffset(offset), InstructionIgnoredError
+	}
+
+	inner, err := getInnerInstructions(inners, offset[1])
+	if err != nil {
+		return increaseOffset(offset), err
+	}
+
+	if len(inner) < 1 {
+		return increaseOffset(offset), InstructionIgnoredError
+	}
+	storeInstruction := inner[0]
+	if len(storeInstruction.Accounts) < 2 {
+		return increaseOffset(offset), InstructionIgnoredError
+	}
+	if storeInstruction.Accounts[0] >= len(tx.rawTx.accountList) || tx.rawTx.accountList[storeInstruction.Accounts[0]] != chainlinkSOLUSDFeedAccount {
+		return increaseOffset(offset), InstructionIgnoredError
+	}
+	if !bytes.Equal(storeInstruction.Data[0:8], chainlinkSubmitDiscriminator[:]) {
+		return increaseOffset(offset), InstructionIgnoredError
+	}
+	data, err := parseChainLinkSubmitData(storeInstruction.Data)
+	if err != nil {
+		return increaseOffset(offset), InstructionIgnoredError
+	}
+	tx.ChainLink.Timestamp = int64(data.Timestamp)
+	tx.ChainLink.Price = decimal.NewFromBigInt(data.Price(), -8)
+	return increaseOffset(offset), nil
+}
+
+type SubmitData struct {
+	Discriminator [8]byte
+	Timestamp     uint64
+	Answer        [16]byte
+}
+
+func parseChainLinkSubmitData(data []byte) (*SubmitData, error) {
+	if len(data) != 32 {
+		return nil, errors.New("invalid submit data length")
+	}
+	var submitData SubmitData
+	copy(submitData.Discriminator[:], data[:8])
+	submitData.Timestamp = binary.LittleEndian.Uint64(data[8:16])
+	copy(submitData.Answer[:], data[16:32])
+	return &submitData, nil
+}
+
+func (s *SubmitData) Price() *big.Int {
+	return int128LEBytesToBigInt(s.Answer)
+}
+
+func int128LEBytesToBigInt(bytes [16]byte) *big.Int {
+	// Create new big.Int
+	bigInt := new(big.Int)
+
+	// Reverse bytes for little-endian to big-endian conversion
+	reversed := make([]byte, 16)
+	for i := 0; i < 16; i++ {
+		reversed[15-i] = bytes[i]
+	}
+
+	// Check if negative (first byte in little-endian is highest byte)
+	isNegative := bytes[15]&0x80 != 0
+
+	if isNegative {
+		// If negative, flip all bits
+		for i := range reversed {
+			reversed[i] = ^reversed[i]
+		}
+		// Convert to big.Int
+		bigInt.SetBytes(reversed)
+		// Add 1 and negate
+		bigInt.Add(bigInt, big.NewInt(1))
+		bigInt.Neg(bigInt)
+	} else {
+		// If positive, convert directly
+		bigInt.SetBytes(reversed)
+	}
+
+	return bigInt
+}

meta.go

@@ -236,4 +236,6 @@ var createAccountWithSeedDiscriminator = uint32(3)
 var systemProgram = solana.MustPublicKeyFromBase58("11111111111111111111111111111111")
 var momoProgram = solana.MustPublicKeyFromBase58("MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr")
 
+var chainLinkProgram = solana.MustPublicKeyFromBase58("cjg3oHmg9uuPsP8D6g29NWvhySJkdYdAo9D25PRbKXJ")
+
 var eventDiscriminator = [8]byte{228, 69, 165, 46, 81, 203, 154, 29}

parser.go

@@ -60,8 +60,9 @@ func WithMeteoraDlmm() ParserOption {
 }
 
 var actionPrograms = map[solana.PublicKey]actionParser{
-	systemProgram:  systemParser,
-	budgGetProgram: budgetParser,
+	systemProgram:    systemParser,
+	budgGetProgram:   budgetParser,
+	chainLinkProgram: chainLinkParser,
 }
 
 func ParseRawTx(rawTx *RawTx) (*Tx, error) {

tx.go

@@ -74,6 +74,10 @@ type SolTransfer struct {
 	To     solana.PublicKey
 	Amount decimal.Decimal
 }
+type ChainLink struct {
+	Timestamp int64
+	Price     decimal.Decimal
+}
 
 type Tx struct {
 	rawTx       *RawTx
@@ -83,6 +87,7 @@ type Tx struct {
 	Swaps       []Swap                  `json:"swaps,omitempty"`
 	SolTransfer []SolTransfer           `json:"sol_transfer,omitempty"`
 	Block       uint64                  `json:"block"`
+	ChainLink   ChainLink               `json:"chain_link"`
 	BlockIndex  uint64                  `json:"index"`
 	TxHash      *[64]byte               `json:"-"`
 	BlockAt     int64                   `json:"block_at"`