eth/filters: add global block logs cache (#25459)

This adds a cache for block logs which is shared by all filters. The cache
size of is configurable using the `--cache.blocklogs` flag.

Co-authored-by: Felix Lange <fjl@twurst.com>

eth/ethconfig/config.go

@@ -83,6 +83,7 @@ var Defaults = Config{
 	TrieDirtyCache:          256,
 	TrieTimeout:             60 * time.Minute,
 	SnapshotCache:           102,
+	FilterLogCacheSize:      32,
 	Miner: miner.Config{
 		GasCeil:  30000000,
 		GasPrice: big.NewInt(params.GWei),
@@ -171,6 +172,9 @@ type Config struct {
 	SnapshotCache           int
 	Preimages               bool
 
+	// This is the number of blocks for which logs will be cached in the filter system.
+	FilterLogCacheSize int
+
 	// Mining options
 	Miner miner.Config
 

eth/ethconfig/gen_config.go

@@ -48,6 +48,7 @@ func (c Config) MarshalTOML() (interface{}, error) {
 		TrieTimeout                           time.Duration
 		SnapshotCache                         int
 		Preimages                             bool
+		FilterLogCacheSize                    int
 		Miner                                 miner.Config
 		Ethash                                ethash.Config
 		TxPool                                core.TxPoolConfig
@@ -93,6 +94,7 @@ func (c Config) MarshalTOML() (interface{}, error) {
 	enc.TrieTimeout = c.TrieTimeout
 	enc.SnapshotCache = c.SnapshotCache
 	enc.Preimages = c.Preimages
+	enc.FilterLogCacheSize = c.FilterLogCacheSize
 	enc.Miner = c.Miner
 	enc.Ethash = c.Ethash
 	enc.TxPool = c.TxPool
@@ -142,6 +144,7 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 		TrieTimeout                           *time.Duration
 		SnapshotCache                         *int
 		Preimages                             *bool
+		FilterLogCacheSize                    *int
 		Miner                                 *miner.Config
 		Ethash                                *ethash.Config
 		TxPool                                *core.TxPoolConfig
@@ -250,6 +253,9 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 	if dec.Preimages != nil {
 		c.Preimages = *dec.Preimages
 	}
+	if dec.FilterLogCacheSize != nil {
+		c.FilterLogCacheSize = *dec.FilterLogCacheSize
+	}
 	if dec.Miner != nil {
 		c.Miner = *dec.Miner
 	}