Use groupcache pool for state db access (#91)

* Use groupcache pool for state db access

* Group cache config and logging stats on timer

* Integrate state validator into server

* Use tagged ipfs-ethdb

* groupcache config for tests

* Work around duplicate registration of groupcache error in tests

* Use tagged version of eth-ipfs-state-validator

* State validation command.

* Validator for static replicas to keep cache warm

* Update docker go-version and go.mod.

* Address comments and self review.

* Fix ipfs-ethdb version.

Co-authored-by: Arijit Das <arijitad.in@gmail.com>

pkg/eth/eth_state_test.go

@@ -21,7 +21,6 @@ import (
 	"context"
 	"io/ioutil"
 	"math/big"
-	"time"
 
 	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
@@ -37,10 +36,10 @@ import (
 	sdtypes "github.com/ethereum/go-ethereum/statediff/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-	pgipfsethdb "github.com/vulcanize/ipfs-ethdb/postgres"
 
 	"github.com/vulcanize/ipld-eth-server/pkg/eth"
 	"github.com/vulcanize/ipld-eth-server/pkg/eth/test_helpers"
+	ethServerShared "github.com/vulcanize/ipld-eth-server/pkg/shared"
 )
 
 var (
@@ -80,12 +79,15 @@ var _ = Describe("eth state reading tests", func() {
 		transformer := indexer.NewStateDiffIndexer(chainConfig, db)
 		backend, err = eth.NewEthBackend(db, &eth.Config{
 			ChainConfig: chainConfig,
-			VmConfig:    vm.Config{},
+			VMConfig:    vm.Config{},
 			RPCGasCap:   big.NewInt(10000000000), // Max gas capacity for a rpc call.
-			CacheConfig: pgipfsethdb.CacheConfig{
-				Name:           "eth_state",
-				Size:           3000000, // 3MB
-				ExpiryDuration: time.Hour,
+			GroupCacheConfig: &ethServerShared.GroupCacheConfig{
+				StateDB: ethServerShared.GroupConfig{
+					Name:                   "eth_state_test",
+					CacheSizeInMB:          8,
+					CacheExpiryInMins:      60,
+					LogStatsIntervalInSecs: 0,
+				},
 			},
 		})
 		Expect(err).ToNot(HaveOccurred())