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connector_handler.go
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connector_handler.go
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package functions
import (
"context"
"crypto/ecdsa"
"encoding/json"
"fmt"
"go.uber.org/multierr"
"github.com/smartcontractkit/chainlink/v2/core/assets"
"github.com/smartcontractkit/chainlink/v2/core/logger"
"github.com/smartcontractkit/chainlink/v2/core/services/gateway/api"
"github.com/smartcontractkit/chainlink/v2/core/services/gateway/common"
"github.com/smartcontractkit/chainlink/v2/core/services/gateway/connector"
hc "github.com/smartcontractkit/chainlink/v2/core/services/gateway/handlers/common"
"github.com/smartcontractkit/chainlink/v2/core/services/gateway/handlers/functions"
"github.com/smartcontractkit/chainlink/v2/core/services/s4"
"github.com/smartcontractkit/chainlink/v2/core/utils"
ethCommon "github.com/ethereum/go-ethereum/common"
)
type functionsConnectorHandler struct {
utils.StartStopOnce
connector connector.GatewayConnector
signerKey *ecdsa.PrivateKey
nodeAddress string
storage s4.Storage
allowlist functions.OnchainAllowlist
rateLimiter *hc.RateLimiter
subscriptions functions.OnchainSubscriptions
minimumBalance assets.Link
lggr logger.Logger
}
var (
_ connector.Signer = &functionsConnectorHandler{}
_ connector.GatewayConnectorHandler = &functionsConnectorHandler{}
)
func NewFunctionsConnectorHandler(nodeAddress string, signerKey *ecdsa.PrivateKey, storage s4.Storage, allowlist functions.OnchainAllowlist, rateLimiter *hc.RateLimiter, subscriptions functions.OnchainSubscriptions, minimumBalance assets.Link, lggr logger.Logger) (*functionsConnectorHandler, error) {
if signerKey == nil || storage == nil || allowlist == nil || rateLimiter == nil || subscriptions == nil {
return nil, fmt.Errorf("signerKey, storage, allowlist, rateLimiter and subscriptions must be non-nil")
}
return &functionsConnectorHandler{
nodeAddress: nodeAddress,
signerKey: signerKey,
storage: storage,
allowlist: allowlist,
rateLimiter: rateLimiter,
subscriptions: subscriptions,
minimumBalance: minimumBalance,
lggr: lggr.Named("FunctionsConnectorHandler"),
}, nil
}
func (h *functionsConnectorHandler) SetConnector(connector connector.GatewayConnector) {
h.connector = connector
}
func (h *functionsConnectorHandler) Sign(data ...[]byte) ([]byte, error) {
return common.SignData(h.signerKey, data...)
}
func (h *functionsConnectorHandler) HandleGatewayMessage(ctx context.Context, gatewayId string, msg *api.Message) {
body := &msg.Body
fromAddr := ethCommon.HexToAddress(body.Sender)
if !h.allowlist.Allow(fromAddr) {
h.lggr.Errorw("allowlist prevented the request from this address", "id", gatewayId, "address", fromAddr)
return
}
if !h.rateLimiter.Allow(body.Sender) {
h.lggr.Errorw("request rate-limited", "id", gatewayId, "address", fromAddr)
return
}
if balance, err := h.subscriptions.GetMaxUserBalance(fromAddr); err != nil || balance.Cmp(h.minimumBalance.ToInt()) < 0 {
h.lggr.Errorw("user subscription has insufficient balance", "id", gatewayId, "address", fromAddr, "balance", balance, "minBalance", h.minimumBalance)
return
}
h.lggr.Debugw("handling gateway request", "id", gatewayId, "method", body.Method)
switch body.Method {
case functions.MethodSecretsList:
h.handleSecretsList(ctx, gatewayId, body, fromAddr)
case functions.MethodSecretsSet:
h.handleSecretsSet(ctx, gatewayId, body, fromAddr)
default:
h.lggr.Errorw("unsupported method", "id", gatewayId, "method", body.Method)
}
}
func (h *functionsConnectorHandler) Start(ctx context.Context) error {
return h.StartOnce("FunctionsConnectorHandler", func() error {
if err := h.allowlist.Start(ctx); err != nil {
return err
}
return h.subscriptions.Start(ctx)
})
}
func (h *functionsConnectorHandler) Close() error {
return h.StopOnce("FunctionsConnectorHandler", func() (err error) {
err = multierr.Combine(err, h.allowlist.Close())
err = multierr.Combine(err, h.subscriptions.Close())
return
})
}
func (h *functionsConnectorHandler) handleSecretsList(ctx context.Context, gatewayId string, body *api.MessageBody, fromAddr ethCommon.Address) {
var response functions.SecretsListResponse
snapshot, err := h.storage.List(ctx, fromAddr)
if err == nil {
response.Success = true
response.Rows = make([]functions.SecretsListRow, len(snapshot))
for i, row := range snapshot {
response.Rows[i] = functions.SecretsListRow{
SlotID: row.SlotId,
Version: row.Version,
Expiration: row.Expiration,
}
}
} else {
response.ErrorMessage = fmt.Sprintf("Failed to list secrets: %v", err)
}
if err := h.sendResponse(ctx, gatewayId, body, response); err != nil {
h.lggr.Errorw("failed to send response to gateway", "id", gatewayId, "error", err)
}
}
func (h *functionsConnectorHandler) handleSecretsSet(ctx context.Context, gatewayId string, body *api.MessageBody, fromAddr ethCommon.Address) {
var request functions.SecretsSetRequest
var response functions.SecretsSetResponse
err := json.Unmarshal(body.Payload, &request)
if err == nil {
key := s4.Key{
Address: fromAddr,
SlotId: request.SlotID,
Version: request.Version,
}
record := s4.Record{
Expiration: request.Expiration,
Payload: request.Payload,
}
h.lggr.Debugw("handling a secrets_set request", "address", fromAddr, "slotId", request.SlotID, "payloadVersion", request.Version, "expiration", request.Expiration)
err = h.storage.Put(ctx, &key, &record, request.Signature)
if err == nil {
response.Success = true
} else {
response.ErrorMessage = fmt.Sprintf("Failed to set secret: %v", err)
}
} else {
response.ErrorMessage = fmt.Sprintf("Bad request to set secret: %v", err)
}
if err := h.sendResponse(ctx, gatewayId, body, response); err != nil {
h.lggr.Errorw("failed to send response to gateway", "id", gatewayId, "error", err)
}
}
func (h *functionsConnectorHandler) sendResponse(ctx context.Context, gatewayId string, requestBody *api.MessageBody, payload any) error {
payloadJson, err := json.Marshal(payload)
if err != nil {
return err
}
msg := &api.Message{
Body: api.MessageBody{
MessageId: requestBody.MessageId,
DonId: requestBody.DonId,
Method: requestBody.Method,
Receiver: requestBody.Sender,
Payload: payloadJson,
},
}
if err = msg.Sign(h.signerKey); err != nil {
return err
}
err = h.connector.SendToGateway(ctx, gatewayId, msg)
if err == nil {
h.lggr.Debugw("sent to gateway", "id", gatewayId, "messageId", requestBody.MessageId, "donId", requestBody.DonId, "method", requestBody.Method)
}
return err
}