add sf.firehose.v2.EndpointInfo/Info endpoint and logic

.gitignore

@@ -1,4 +1,5 @@
 .idea
+.vscode
 /build
 /dist
 .envrc

CHANGELOG.md

@@ -10,6 +10,20 @@ If you were at `firehose-core` version `1.0.0` and are bumping to `1.1.0`, you s
 
 ## Unreleased
 
+* Add `sf.firehose.v2.EndpointInfo/Info` service on Firehose and `sf.substreams.rpc.v2.EndpointInfo/Info` to Substreams endpoints. This involves the following new flags:
+  - `advertise-chain-name` Canonical name of the chain according to https://thegraph.com/docs/en/developing/supported-networks/ (required, unless it is in the "well-known" list)
+  - `advertise-chain-aliases` Alternate names for that chain (optional)
+  - `advertise-block-features` List of features describing the blocks (optional)
+  - `advertise-block-id-encoding` Encoding format of the block ID [BLOCK_ID_ENCODING_BASE58, BLOCK_ID_ENCODING_BASE64, BLOCK_ID_ENCODING_BASE64URL, BLOCK_ID_ENCODING_HEX, BLOCK_ID_ENCODING_0X_HEX] (required, unless the block type is in the "well-known" list)
+  - `ignore-advertise-validation` Runtime checks of chain name/features/encoding against the genesis block will no longer cause server to wait or fail.
+
+* Add a well-known list of chains (hard-coded in `wellknown/chains.go` to help automatically determine the 'advertise' flag values). Users are encouraged to propose Pull Requests to add more chains to the list.
+* The new info endpoint adds a mandatory fetching of the first streamable block on startup, with a failure if no block can be fetched after 3 minutes and you are running `firehose` or `substreams-tier1` service.
+  It validates the following on a well-known chain:
+    - if the first-streamable-block Num/ID match the genesis block of a known chain, e.g. `matic`, it will refuse another value for `advertise-chain-name` than `matic` or one of its aliases (`polygon`)
+    - If the first-streamable-block does not match any known chain, it will require the `advertise-chain-name` to be non-empty
+    - If the first-streamable-block type is unknown (i.e. not ethereum, solana, near, cosmos, bitcoin...), it will require the user to provide `advertise-chain-name` as well as `advertise-block-id-encoding`
+
 * Substreams: revert module hash calculation from `v1.5.5`, when using a non-zero firstStreamableBlock. Hashes will now be the same even if the chain's first streamable block affects the initialBlock of a module.
 * Substreams: add `--substreams-block-execution-timeout` flag (default 3 minutes) to prevent requests stalling
 

chain.go

@@ -6,6 +6,7 @@ import (
 	"runtime/debug"
 	"strings"
 
+	pbfirehose "github.com/streamingfast/pbgo/sf/firehose/v2"
 	"github.com/streamingfast/substreams/wasm"
 
 	"github.com/spf13/cobra"
@@ -154,6 +155,10 @@ type Chain[B Block] struct {
 	DefaultBlockType string
 
 	RegisterSubstreamsExtensions func() (wasm.WASMExtensioner, error)
+
+	// InfoResponseFiller is a function that fills the `pbfirehose.InfoResponse` from the first streamable block of the chain.
+	// It can validate that we are on the right chain by checking against a known hash, or populate missing fields.
+	InfoResponseFiller func(firstStreamableBlock *pbbstream.Block, resp *pbfirehose.InfoResponse, validate bool) error
 }
 
 type ToolsConfig[B Block] struct {
@@ -261,6 +266,10 @@ func (c *Chain[B]) Validate() {
 		err = multierr.Append(err, fmt.Errorf("field 'BlockIndexerFactories' must have at most one element"))
 	}
 
+	if c.InfoResponseFiller == nil {
+		err = multierr.Append(err, fmt.Errorf("field 'InfoResponseFiller' must be set"))
+	}
+
 	for key, indexerFactory := range c.BlockIndexerFactories {
 		if indexerFactory == nil {
 			err = multierr.Append(err, fmt.Errorf("entry %q for field 'BlockIndexerFactories' must be non-nil", key))

cmd/apps/firehose.go

@@ -101,6 +101,7 @@ func RegisterFirehoseApp[B firecore.Block](chain *firecore.Chain[B], rootLog *za
 				HeadBlockNumberMetric: headBlockNumMetric,
 				TransformRegistry:     registry,
 				CheckPendingShutdown:  runtime.IsPendingShutdown,
+				InfoServer:            runtime.InfoServer,
 			}), nil
 		},
 	})

cmd/apps/start.go

@@ -26,7 +26,9 @@ import (
 	"github.com/streamingfast/cli/sflags"
 	"github.com/streamingfast/dmetering"
 	firecore "github.com/streamingfast/firehose-core"
+	info "github.com/streamingfast/firehose-core/firehose/info"
 	"github.com/streamingfast/firehose-core/launcher"
+	pbfirehose "github.com/streamingfast/pbgo/sf/firehose/v2"
 	tracing "github.com/streamingfast/sf-tracing"
 	"go.uber.org/zap"
 	"golang.org/x/exp/slices"
@@ -45,7 +47,7 @@ func ConfigureStartCmd[B firecore.Block](chain *firecore.Chain[B], binaryName st
 		configFile := sflags.MustGetString(cmd, "config-file")
 		rootLog.Info(fmt.Sprintf("starting Firehose on %s with config file '%s'", chain.LongName, configFile))
 
-		err = start(cmd, dataDir, args, rootLog)
+		err = start(cmd, dataDir, args, chain, rootLog)
 		if err != nil {
 			return fmt.Errorf("unable to launch: %w", err)
 		}
@@ -55,7 +57,7 @@ func ConfigureStartCmd[B firecore.Block](chain *firecore.Chain[B], binaryName st
 	}
 }
 
-func start(cmd *cobra.Command, dataDir string, args []string, rootLog *zap.Logger) (err error) {
+func start[B firecore.Block](cmd *cobra.Command, dataDir string, args []string, chain *firecore.Chain[B], rootLog *zap.Logger) (err error) {
 	dataDirAbs, err := filepath.Abs(dataDir)
 	if err != nil {
 		return fmt.Errorf("unable to setup directory structure: %w", err)
@@ -82,7 +84,23 @@ func start(cmd *cobra.Command, dataDir string, args []string, rootLog *zap.Logge
 	}()
 	dmetering.SetDefaultEmitter(eventEmitter)
 
-	launch := launcher.NewLauncher(rootLog, dataDirAbs)
+	blockIDEncoding := pbfirehose.InfoResponse_BLOCK_ID_ENCODING_UNSET
+	if enc := sflags.MustGetString(cmd, "advertise-block-id-encoding"); enc != "" {
+		blockIDEncoding = pbfirehose.InfoResponse_BlockIdEncoding(pbfirehose.InfoResponse_BlockIdEncoding_value[enc])
+	}
+
+	infoServer := info.NewInfoServer(
+		sflags.MustGetString(cmd, "advertise-chain-name"),
+		sflags.MustGetStringSlice(cmd, "advertise-chain-aliases"),
+		blockIDEncoding,
+		sflags.MustGetStringSlice(cmd, "advertise-block-features"),
+		bstream.GetProtocolFirstStreamableBlock,
+		!sflags.MustGetBool(cmd, "ignore-advertise-validation"),
+		chain.InfoResponseFiller,
+		rootLog,
+	)
+
+	launch := launcher.NewLauncher(rootLog, dataDirAbs, infoServer)
 	rootLog.Debug("launcher created")
 
 	runByDefault := func(app string) bool {

cmd/apps/substreams_tier1.go

@@ -150,6 +150,7 @@ func RegisterSubstreamsTier1App[B firecore.Block](chain *firecore.Chain[B], root
 					HeadTimeDriftMetric:   ss1HeadTimeDriftmetric,
 					HeadBlockNumberMetric: ss1HeadBlockNumMetric,
 					CheckPendingShutDown:  runtime.IsPendingShutdown,
+					InfoServer:            runtime.InfoServer,
 				}), nil
 		},
 	})

cmd/firecore/main.go

@@ -4,6 +4,7 @@ import (
 	pbbstream "github.com/streamingfast/bstream/pb/sf/bstream/v1"
 	firecore "github.com/streamingfast/firehose-core"
 	fhCMD "github.com/streamingfast/firehose-core/cmd"
+	info "github.com/streamingfast/firehose-core/firehose/info"
 )
 
 func main() {
@@ -17,6 +18,7 @@ func main() {
 		Version:              version,
 		BlockFactory:         func() firecore.Block { return new(pbbstream.Block) },
 		ConsoleReaderFactory: firecore.NewConsoleReader,
+		InfoResponseFiller:   info.DefaultInfoResponseFiller,
 		Tools:                &firecore.ToolsConfig[*pbbstream.Block]{},
 	})
 }

cmd/main.go

@@ -23,6 +23,7 @@ import (
 	"github.com/streamingfast/firehose-core/cmd/tools"
 	"github.com/streamingfast/firehose-core/launcher"
 	paymentGatewayMetering "github.com/streamingfast/payment-gateway/metering"
+	pbfirehose "github.com/streamingfast/pbgo/sf/firehose/v2"
 
 	"github.com/streamingfast/logging"
 	"go.uber.org/zap"
@@ -171,6 +172,21 @@ func registerCommonFlags[B firecore.Block](chain *firecore.Chain[B]) {
 		cmd.Flags().String("common-forked-blocks-store-url", firecore.ForkedBlocksStoreURL, "[COMMON] Store URL where to read/write forked block files that we want to keep.")
 		cmd.Flags().String("common-live-blocks-addr", firecore.RelayerServingAddr, "[COMMON] gRPC endpoint to get real-time blocks.")
 
+		cmd.Flags().String("advertise-chain-name", "", "[firehose,substreams-tier1] Chain name to advertise in the Info Endpoint. Required but it may be inferred from the genesis blocks.")
+		cmd.Flags().StringSlice("advertise-chain-aliases", nil, "[firehose,substreams-tier1] List of chain name aliases to advertise in the Info Endpoint. If unset, it may be inferred from the genesis blocks.")
+		cmd.Flags().StringSlice("advertise-block-features", nil, "[firehose,substreams-tier1] List of block features to advertise in the Info Endpoint. If unset, it may be inferred from the genesis block.")
+		cmd.Flags().Bool("ignore-advertise-validation", false, "[firehose,substreams-tier1] When true, runtime checks of chain name/features/encoding against the genesis block will no longer cause server to wait or fail.")
+
+		acceptedEncodings := make([]string, len(pbfirehose.InfoResponse_BlockIdEncoding_value)-1)
+		i := 0
+		for encoding := range pbfirehose.InfoResponse_BlockIdEncoding_value {
+			if encoding != "BLOCK_ID_ENCODING_UNSET" {
+				acceptedEncodings[i] = encoding
+				i++
+			}
+		}
+		cmd.Flags().String("advertise-block-id-encoding", "", fmt.Sprintf("[firehose,substreams-tier1] Block ID encoding type to advertise in the Info Endpoint (%s). If unset, it may be inferred from the genesis block.", strings.Join(acceptedEncodings, ", ")))
+
 		cmd.Flags().String("common-index-store-url", firecore.IndexStoreURL, "[COMMON] Store URL where to read/write index files (if used on the chain).")
 		cmd.Flags().IntSlice("common-index-block-sizes", []int{100000, 10000, 1000, 100}, "Index bundle sizes that that are considered valid when looking for block indexes")
 

cmd/setup.go

@@ -51,6 +51,10 @@ func setupCmd(cmd *cobra.Command, binaryName string) error {
 				return fmt.Errorf("invalid flag %s in config file under command %s", k, subCommand)
 			}
 
+			// Keep compatibility with config files, allow empty value to unset the flag
+			if v == nil {
+				v = ""
+			}
 			viper.SetDefault(flag.viperKey, v)
 
 			// For root command, we want to keep compatibility for `viper.GetXXX("global-<flag>")` to work with config loaded value

firehose/app/firehose/app.go

@@ -31,6 +31,7 @@ import (
 	"github.com/streamingfast/dstore"
 	firecore "github.com/streamingfast/firehose-core"
 	"github.com/streamingfast/firehose-core/firehose"
+	"github.com/streamingfast/firehose-core/firehose/info"
 	"github.com/streamingfast/firehose-core/firehose/metrics"
 	"github.com/streamingfast/firehose-core/firehose/server"
 	"github.com/streamingfast/logging"
@@ -64,6 +65,7 @@ type Modules struct {
 	TransformRegistry        *transform.Registry
 	RegisterServiceExtension RegisterServiceExtensionFunc
 	CheckPendingShutdown     func() bool
+	InfoServer               *info.InfoServer
 }
 
 type App struct {
@@ -158,6 +160,7 @@ func (a *App) Run() error {
 		a.IsReady,
 		a.config.GRPCListenAddr,
 		a.config.ServiceDiscoveryURL,
+		a.modules.InfoServer,
 		a.config.ServerOptions...,
 	)
 
@@ -186,6 +189,12 @@ func (a *App) Run() error {
 			}
 		}
 
+		ctx, cancel := context.WithTimeout(context.Background(), 3*time.Minute)
+		defer cancel()
+		if err := a.modules.InfoServer.Init(ctx, forkableHub, mergedBlocksStore, oneBlocksStore, a.logger); err != nil {
+			a.Shutdown(fmt.Errorf("cannot initialize info server: %w", err))
+		}
+
 		a.logger.Info("launching gRPC firehoseServer", zap.Bool("live_support", withLive))
 		a.isReady.CAS(false, true)
 		firehoseServer.Launch()