feat(metrics): introduce ProverProvenByGuardianGauge (#794)

internal/metrics/metrics.go

@@ -39,6 +39,7 @@ var (
 	ProverProofsAssigned             = factory.NewCounter(prometheus.CounterOpts{Name: "prover_proof_assigned"})
 	ProverReceivedProposedBlockGauge = factory.NewGauge(prometheus.GaugeOpts{Name: "prover_proposed_received"})
 	ProverReceivedProvenBlockGauge   = factory.NewGauge(prometheus.GaugeOpts{Name: "prover_proven_received"})
+	ProverProvenByGuardianGauge      = factory.NewGauge(prometheus.GaugeOpts{Name: "prover_proven_by_guardian"})
 	ProverSubmissionAcceptedCounter  = factory.NewCounter(prometheus.CounterOpts{
 		Name: "prover_proof_submission_accepted",
 	})

pkg/rpc/methods.go

@@ -725,6 +725,14 @@ func (c *Client) GetTaikoDataSlotBByNumber(ctx context.Context, number uint64) (
 	return nil, fmt.Errorf("failed to get state variables by block number %d", number)
 }
 
+// GetGuardianProverAddress fetches the guardian prover address from the protocol.
+func (c *Client) GetGuardianProverAddress(ctx context.Context) (common.Address, error) {
+	ctxWithTimeout, cancel := ctxWithTimeoutOrDefault(ctx, defaultTimeout)
+	defer cancel()
+
+	return c.TaikoL1.Resolve0(&bind.CallOpts{Context: ctxWithTimeout}, StringToBytes32("tier_guardian"), false)
+}
+
 // WaitL1NewPendingTransaction waits until the L1 account has a new pending transaction.
 func (c *Client) WaitL1NewPendingTransaction(
 	ctx context.Context,

prover/event_handler/block_verified.go

@@ -9,12 +9,23 @@ import (
 )
 
 // BlockVerifiedEventHandler is responsible for handling the BlockVerified event.
-type BlockVerifiedEventHandler struct{}
+type BlockVerifiedEventHandler struct {
+	guardianProverAddress common.Address
+}
+
+// NewBlockVerifiedEventHandler creates a new BlockVerifiedEventHandler instance.
+func NewBlockVerifiedEventHandler(guardianProverAddress common.Address) *BlockVerifiedEventHandler {
+	return &BlockVerifiedEventHandler{guardianProverAddress: guardianProverAddress}
+}
 
 // Handle handles the BlockVerified event.
 func (h *BlockVerifiedEventHandler) Handle(e *bindings.TaikoL1ClientBlockVerified) {
 	metrics.ProverLatestVerifiedIDGauge.Set(float64(e.BlockId.Uint64()))
 
+	if e.Prover == h.guardianProverAddress {
+		metrics.ProverProvenByGuardianGauge.Set(1)
+	}
+
 	log.Info(
 		"New verified block",
 		"blockID", e.BlockId,

prover/init.go

@@ -193,7 +193,7 @@ func (p *Prover) initL1Current(startingBlockID *big.Int) error {
 }
 
 // initEventHandlers initialize all event handlers which will be used by the current prover.
-func (p *Prover) initEventHandlers() {
+func (p *Prover) initEventHandlers() error {
 	// ------- BlockProposed -------
 	opts := &handler.NewBlockProposedEventHandlerOps{
 		SharedState:           p.sharedState,
@@ -240,6 +240,13 @@ func (p *Prover) initEventHandlers() {
 		p.proofContestCh,
 		p.cfg.ContesterMode,
 	)
+
 	// ------- BlockVerified -------
-	p.blockVerifiedHandler = new(handler.BlockVerifiedEventHandler)
+	guardianProverAddress, err := p.rpc.GetGuardianProverAddress(p.ctx)
+	if err != nil {
+		return err
+	}
+	p.blockVerifiedHandler = handler.NewBlockVerifiedEventHandler(guardianProverAddress)
+
+	return nil
 }

prover/prover.go

@@ -203,7 +203,9 @@ func InitFromConfig(ctx context.Context, p *Prover, cfg *Config) (err error) {
 	}
 
 	// Initialize event handlers.
-	p.initEventHandlers()
+	if err := p.initEventHandlers(); err != nil {
+		return err
+	}
 
 	return nil
 }

prover/prover_test.go

@@ -234,14 +234,14 @@ func (s *ProverTestSuite) TestOnBlockVerified() {
 func (s *ProverTestSuite) TestContestWrongBlocks() {
 	s.T().Skip()
 	s.p.cfg.ContesterMode = false
-	s.p.initEventHandlers()
+	s.Nil(s.p.initEventHandlers())
 	e := s.ProposeAndInsertValidBlock(s.proposer, s.d.ChainSyncer().BlobSyncer())
 	s.Nil(s.p.transitionProvedHandler.Handle(context.Background(), &bindings.TaikoL1ClientTransitionProved{
 		BlockId: e.BlockId,
 		Tier:    e.Meta.MinTier,
 	}))
 	s.p.cfg.ContesterMode = true
-	s.p.initEventHandlers()
+	s.Nil(s.p.initEventHandlers())
 
 	// Submit a wrong proof at first.
 	sink := make(chan *bindings.TaikoL1ClientTransitionProved)
@@ -284,7 +284,7 @@ func (s *ProverTestSuite) TestContestWrongBlocks() {
 		contesterKey,
 	))
 	s.p.cfg.ContesterMode = true
-	s.p.initEventHandlers()
+	s.Nil(s.p.initEventHandlers())
 
 	s.Greater(header.Number.Uint64(), uint64(0))
 	s.Nil(s.p.transitionProvedHandler.Handle(context.Background(), event))