add health api method for checking the health of a node through RPC

ethapi/api.go

@@ -58,7 +58,8 @@ import (
 )
 
 var (
-	noUncles = []evmcore.EvmHeader{}
+	noUncles  = []evmcore.EvmHeader{}
+	startTime = time.Now()
 )
 
 // PublicEthereumAPI provides an API to access Ethereum related information.
@@ -187,6 +188,26 @@ func (s *PublicEthereumAPI) Syncing() (interface{}, error) {
 	}, nil
 }
 
+// Health returns true if node is healthy and synced
+func (s *PublicEthereumAPI) Health(blockTimeSecThreshold uint64, uptimeSecThreshold uint, peerCountThreshold uint) (interface{}, error) {
+	blockTime := time.Duration(blockTimeSecThreshold) * time.Second
+	uptimeThreshold := time.Duration(uptimeSecThreshold) * time.Second
+	uptime := time.Since(startTime)
+	progress := s.b.Progress()
+	peerCount := s.b.PeerCount()
+	log.Debug("Health check", "peerCount", peerCount, "peerCountThreshold", peerCountThreshold, "uptime", uptime, "uptimeThreshold", uptimeThreshold, "progress", progress, "currentBlockTime", time.Since(progress.CurrentBlockTime.Time()), "blockTime", blockTime)
+
+	if uptime < uptimeThreshold || progress.CurrentBlock < progress.HighestBlock || peerCount < int(peerCountThreshold) {
+		return false, nil
+	}
+
+	if blockTime > 0 && time.Since(progress.CurrentBlockTime.Time()) > blockTime {
+		return false, nil
+	}
+
+	return true, nil
+}
+
 // PublicTxPoolAPI offers and API for the transaction pool. It only operates on data that is non confidential.
 type PublicTxPoolAPI struct {
 	b Backend

ethapi/backend.go

@@ -54,6 +54,7 @@ type PeerProgress struct {
 type Backend interface {
 	// General Ethereum API
 	Progress() PeerProgress
+	PeerCount() int
 	SuggestGasTipCap(ctx context.Context, certainty uint64) *big.Int
 	EffectiveMinGasPrice(ctx context.Context) *big.Int
 	ChainDb() ethdb.Database

go.mod

@@ -109,7 +109,7 @@ require (
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
-replace github.com/ethereum/go-ethereum => github.com/faircrypto/go-ethereum v1.1.4-rc1-4
+replace github.com/ethereum/go-ethereum => github.com/faircrypto/go-ethereum v1.1.4-rc1-5
 
 replace github.com/Fantom-foundation/lachesis-base => github.com/faircrypto/lachesis-base v0.0.0-20230817040848-1326ba9aa59b
 

go.sum

@@ -190,8 +190,8 @@ github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7
 github.com/etcd-io/bbolt v1.3.3/go.mod h1:ZF2nL25h33cCyBtcyWeZ2/I3HQOfTP+0PIEvHjkjCrw=
 github.com/evalphobia/logrus_sentry v0.8.2 h1:dotxHq+YLZsT1Bb45bB5UQbfCh3gM/nFFetyN46VoDQ=
 github.com/evalphobia/logrus_sentry v0.8.2/go.mod h1:pKcp+vriitUqu9KiWj/VRFbRfFNUwz95/UkgG8a6MNc=
-github.com/faircrypto/go-ethereum v1.1.4-rc1-4 h1:1C5SKbOuwFyuMrut1SvD+qyFUlC52cA8P+TKC6igKjg=
-github.com/faircrypto/go-ethereum v1.1.4-rc1-4/go.mod h1:ah5rnRobPJSTUKXIETbrkyrrEhWPTUPfmF1gPPNr0Tg=
+github.com/faircrypto/go-ethereum v1.1.4-rc1-5 h1:CQu2ZtQHeTROdJse4+FzwQ+qrJO297HrVIup+3yCc1I=
+github.com/faircrypto/go-ethereum v1.1.4-rc1-5/go.mod h1:ah5rnRobPJSTUKXIETbrkyrrEhWPTUPfmF1gPPNr0Tg=
 github.com/faircrypto/lachesis-base v0.0.0-20230817040848-1326ba9aa59b h1:mEofwrV6bMlbuneVS8tnZmNZut7WY2YH++2GI7DxzHg=
 github.com/faircrypto/lachesis-base v0.0.0-20230817040848-1326ba9aa59b/go.mod h1:Ogv5etzSmM2rQ4eN3OfmyitwWaaPjd4EIDiW/NAbYGk=
 github.com/fasthttp-contrib/websocket v0.0.0-20160511215533-1f3b11f56072/go.mod h1:duJ4Jxv5lDcvg4QuQr0oowTf7dz4/CR8NtyCooz9HL8=

gossip/ethapi_backend.go

@@ -541,3 +541,7 @@ func (b *EthAPIBackend) SealedEpochTiming(ctx context.Context) (start inter.Time
 	es := b.svc.store.GetEpochState()
 	return es.PrevEpochStart, es.EpochStart
 }
+
+func (b *EthAPIBackend) PeerCount() int {
+	return b.svc.handler.peers.Len()
+}