feat!: Add gas limits to queries (backport #16239) (#17324)

Co-authored-by: Dev Ojha <ValarDragon@users.noreply.github.com>

server/config/config.go

@@ -39,6 +39,10 @@ type BaseConfig struct {
 	// specified in this config (e.g. 0.25token1;0.0001token2).
 	MinGasPrices string `mapstructure:"minimum-gas-prices"`
 
+	// The maximum amount of gas a grpc/Rest query may consume.
+	// If set to 0, it is unbounded.
+	QueryGasLimit uint64 `mapstructure:"query-gas-limit"`
+
 	Pruning           string `mapstructure:"pruning"`
 	PruningKeepRecent string `mapstructure:"pruning-keep-recent"`
 	PruningInterval   string `mapstructure:"pruning-interval"`
@@ -225,6 +229,7 @@ func DefaultConfig() *Config {
 	return &Config{
 		BaseConfig: BaseConfig{
 			MinGasPrices:        defaultMinGasPrices,
+			QueryGasLimit:       0,
 			InterBlockCache:     true,
 			Pruning:             pruningtypes.PruningOptionDefault,
 			PruningKeepRecent:   "0",

server/config/toml.go

@@ -21,6 +21,10 @@ const DefaultConfigTemplate = `# This is a TOML config file.
 # specified in this config (e.g. 0.25token1;0.0001token2).
 minimum-gas-prices = "{{ .BaseConfig.MinGasPrices }}"
 
+# The maximum gas a query coming over rest/grpc may consume.
+# If this is set to zero, the query can consume an unbounded amount of gas.
+query-gas-limit = "{{ .BaseConfig.QueryGasLimit }}"
+
 # default: the last 362880 states are kept, pruning at 10 block intervals
 # nothing: all historic states will be saved, nothing will be deleted (i.e. archiving node)
 # everything: 2 latest states will be kept; pruning at 10 block intervals.

server/start.go

@@ -50,6 +50,7 @@ const (
 	flagTraceStore         = "trace-store"
 	flagCPUProfile         = "cpu-profile"
 	FlagMinGasPrices       = "minimum-gas-prices"
+	FlagQueryGasLimit      = "query-gas-limit"
 	FlagHaltHeight         = "halt-height"
 	FlagHaltTime           = "halt-time"
 	FlagInterBlockCache    = "inter-block-cache"
@@ -180,6 +181,7 @@ is performed. Note, when enabled, gRPC will also be automatically enabled.
 	cmd.Flags().String(flagTransport, "socket", "Transport protocol: socket, grpc")
 	cmd.Flags().String(flagTraceStore, "", "Enable KVStore tracing to an output file")
 	cmd.Flags().String(FlagMinGasPrices, "", "Minimum gas prices to accept for transactions; Any fee in a tx must meet this minimum (e.g. 0.01photino;0.0001stake)")
+	cmd.Flags().Uint64(FlagQueryGasLimit, 0, "Maximum gas a Rest/Grpc query can consume. Blank and 0 imply unbounded.")
 	cmd.Flags().IntSlice(FlagUnsafeSkipUpgrades, []int{}, "Skip a set of upgrade heights to continue the old binary")
 	cmd.Flags().Uint64(FlagHaltHeight, 0, "Block height at which to gracefully halt the chain and shutdown the node")
 	cmd.Flags().Uint64(FlagHaltTime, 0, "Minimum block time (in Unix seconds) at which to gracefully halt the chain and shutdown the node")

server/util.go

@@ -516,6 +516,7 @@ func DefaultBaseappOptions(appOpts types.AppOptions) []func(*baseapp.BaseApp) {
 		baseapp.SetIAVLDisableFastNode(cast.ToBool(appOpts.Get(FlagDisableIAVLFastNode))),
 		defaultMempool,
 		baseapp.SetChainID(chainID),
+		baseapp.SetQueryGasLimit(cast.ToUint64(appOpts.Get(FlagQueryGasLimit))),
 	}
 }