indexer: Add airdrop API (#2498)

.changeset/cuddly-rings-reply.md

+---
+'@eth-optimism/indexer': minor
+---
+
+Add airdrops API

go/indexer/db/airdrop.go

+package db
+
+type Airdrop struct {
+	Address              string `json:"address"`
+	VoterAmount          string `json:"voterAmount"`
+	MultisigSignerAmount string `json:"multisigSignerAmount"`
+	GitcoinAmount        string `json:"gitcoinAmount"`
+	ActiveBridgedAmount  string `json:"activeBridgedAmount"`
+	OpUserAmount         string `json:"opUserAmount"`
+	OpRepeatUserAmount   string `json:"opRepeatUserAmount"`
+	BonusAmount          string `json:"bonusAmount"`
+	TotalAmount          string `json:"totalAmount"`
+}

go/indexer/db/db.go

@@ -3,6 +3,8 @@ package db
 import (
 	"database/sql"
 	"errors"
+	"fmt"
+	"strings"
 
 	l2common "github.com/ethereum-optimism/optimism/l2geth/common"
 	"github.com/ethereum/go-ethereum/common"
@@ -17,6 +19,31 @@ type Database struct {
 	config string
 }
 
+// NewDatabase returns the database for the given connection string.
+func NewDatabase(config string) (*Database, error) {
+	db, err := sql.Open("postgres", config)
+	if err != nil {
+		return nil, err
+	}
+
+	err = db.Ping()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, migration := range schema {
+		_, err = db.Exec(migration)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return &Database{
+		db:     db,
+		config: config,
+	}, nil
+}
+
 // Close closes the database.
 // NOTE: "It is rarely necessary to close a DB."
 // See: https://pkg.go.dev/database/sql#Open
@@ -633,27 +660,38 @@ func (d *Database) GetIndexedL1BlockByHash(hash common.Hash) (*IndexedL1Block, e
 	return block, nil
 }
 
-// NewDatabase returns the database for the given connection string.
-func NewDatabase(config string) (*Database, error) {
-	db, err := sql.Open("postgres", config)
-	if err != nil {
-		return nil, err
-	}
-
-	err = db.Ping()
-	if err != nil {
-		return nil, err
+const getAirdropQuery = `
+SELECT 
+	address, voter_amount, multisig_signer_amount, gitcoin_amount,
+	active_bridged_amount, op_user_amount, op_repeat_user_amount, 
+    bonus_amount, total_amount
+FROM airdrops
+WHERE address = $1
+`
+
+func (d *Database) GetAirdrop(address common.Address) (*Airdrop, error) {
+	row := d.db.QueryRow(getAirdropQuery, strings.ToLower(address.String()))
+	if row.Err() != nil {
+		return nil, fmt.Errorf("error getting airdrop: %v", row.Err())
+	}
+
+	airdrop := new(Airdrop)
+	err := row.Scan(
+		&airdrop.Address,
+		&airdrop.VoterAmount,
+		&airdrop.MultisigSignerAmount,
+		&airdrop.GitcoinAmount,
+		&airdrop.ActiveBridgedAmount,
+		&airdrop.OpUserAmount,
+		&airdrop.OpRepeatUserAmount,
+		&airdrop.BonusAmount,
+		&airdrop.TotalAmount,
+	)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, nil
 	}
-
-	for _, migration := range schema {
-		_, err = db.Exec(migration)
 	if err != nil {
-			return nil, err
+		return nil, fmt.Errorf("error scanning airdrop: %v", err)
 	}
-	}
-
-	return &Database{
-		db:     db,
-		config: config,
-	}, nil
+	return airdrop, nil
 }

go/indexer/db/sql.go

@@ -107,6 +107,21 @@ CREATE UNIQUE INDEX IF NOT EXISTS l1_blocks_number ON l1_blocks(number);
 CREATE UNIQUE INDEX IF NOT EXISTS l2_blocks_number ON l2_blocks(number);
 `
 
+const createAirdropsTable = `
+CREATE TABLE IF NOT EXISTS airdrops (
+	address VARCHAR(42) PRIMARY KEY,
+	voter_amount VARCHAR NOT NULL DEFAULT '0' CHECK(voter_amount ~ '^\d+$') ,
+	multisig_signer_amount VARCHAR NOT NULL DEFAULT '0' CHECK(multisig_signer_amount ~ '^\d+$'),
+	gitcoin_amount VARCHAR NOT NULL DEFAULT '0' CHECK(gitcoin_amount ~ '^\d+$'),
+	active_bridged_amount VARCHAR NOT NULL DEFAULT '0' CHECK(active_bridged_amount ~ '^\d+$'),
+	op_user_amount VARCHAR NOT NULL DEFAULT '0' CHECK(op_user_amount ~ '^\d+$'),
+	op_repeat_user_amount VARCHAR NOT NULL DEFAULT '0' CHECK(op_user_amount ~ '^\d+$'),
+	op_og_amount VARCHAR NOT NULL DEFAULT '0' CHECK(op_og_amount ~ '^\d+$'),
+	bonus_amount VARCHAR NOT NULL DEFAULT '0' CHECK(bonus_amount ~ '^\d+$'),
+	total_amount VARCHAR NOT NULL CHECK(voter_amount ~ '^\d+$')
+)
+`
+
 var schema = []string{
 	createL1BlocksTable,
 	createL2BlocksTable,
@@ -118,4 +133,5 @@ var schema = []string{
 	createDepositsTable,
 	createWithdrawalsTable,
 	createL1L2NumberIndex,
+	createAirdropsTable,
 }

go/indexer/indexer.go

@@ -9,6 +9,8 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/ethereum-optimism/optimism/go/indexer/services"
+
 	l2rpc "github.com/ethereum-optimism/optimism/l2geth/rpc"
 
 	"github.com/ethereum-optimism/optimism/go/indexer/metrics"
@@ -83,8 +85,10 @@ type Indexer struct {
 
 	l1IndexingService *l1.Service
 	l2IndexingService *l2.Service
+	airdropService    *services.Airdrop
 
 	router  *mux.Router
+	metrics *metrics.Metrics
 }
 
 // NewIndexer initializes the Indexer, gathering any resources
@@ -201,7 +205,9 @@ func NewIndexer(cfg Config, gitVersion string) (*Indexer, error) {
 		l2Client:          l2Client,
 		l1IndexingService: l1IndexingService,
 		l2IndexingService: l2IndexingService,
+		airdropService:    services.NewAirdrop(db, m),
 		router:            mux.NewRouter(),
+		metrics:           m,
 	}, nil
 }
 
@@ -216,6 +222,7 @@ func (b *Indexer) Serve() error {
 	b.router.HandleFunc("/v1/deposits/0x{address:[a-fA-F0-9]{40}}", b.l1IndexingService.GetDeposits).Methods("GET")
 	b.router.HandleFunc("/v1/withdrawal/0x{hash:[a-fA-F0-9]{64}}", b.l2IndexingService.GetWithdrawalBatch).Methods("GET")
 	b.router.HandleFunc("/v1/withdrawals/0x{address:[a-fA-F0-9]{40}}", b.l2IndexingService.GetWithdrawals).Methods("GET")
+	b.router.HandleFunc("/v1/airdrops/0x{address:[a-fA-F0-9]{40}}", b.airdropService.GetAirdrop)
 	b.router.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(200)
 		_, err := w.Write([]byte("OK"))
@@ -224,7 +231,7 @@ func (b *Indexer) Serve() error {
 		}
 	})
 
-	middleware := server.LoggingMiddleware(log.New("service", "server"))
+	middleware := server.LoggingMiddleware(b.metrics, log.New("service", "server"))
 
 	port := strconv.FormatUint(b.cfg.RESTPort, 10)
 	addr := fmt.Sprintf("%s:%s", b.cfg.RESTHostname, port)

go/indexer/metrics/metrics.go

@@ -3,6 +3,8 @@ package metrics
 import (
 	"fmt"
 	"net/http"
+	"strconv"
+	"time"
 
 	l2common "github.com/ethereum-optimism/optimism/l2geth/common"
 	"github.com/ethereum/go-ethereum/common"
@@ -32,6 +34,12 @@ type Metrics struct {
 
 	CachedTokensCount *prometheus.CounterVec
 
+	HTTPRequestsCount prometheus.Counter
+
+	HTTPResponsesCount *prometheus.CounterVec
+
+	HTTPRequestDurationSecs prometheus.Summary
+
 	tokenAddrs map[string]string
 }
 
@@ -110,6 +118,27 @@ func NewMetrics(monitoredTokens map[string]string) *Metrics {
 			"chain",
 		}),
 
+		HTTPRequestsCount: promauto.NewCounter(prometheus.CounterOpts{
+			Name:      "http_requests_count",
+			Help:      "How many HTTP requests this instance has seen",
+			Namespace: metricsNamespace,
+		}),
+
+		HTTPResponsesCount: promauto.NewCounterVec(prometheus.CounterOpts{
+			Name:      "http_responses_count",
+			Help:      "How many HTTP responses this instance has served",
+			Namespace: metricsNamespace,
+		}, []string{
+			"status_code",
+		}),
+
+		HTTPRequestDurationSecs: promauto.NewSummary(prometheus.SummaryOpts{
+			Name:       "http_request_duration_secs",
+			Help:       "How long each HTTP request took",
+			Namespace:  metricsNamespace,
+			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.95: 0.005, 0.99: 0.001},
+		}),
+
 		tokenAddrs: mts,
 	}
 }
@@ -176,6 +205,15 @@ func (m *Metrics) IncL2CachedTokensCount() {
 	m.CachedTokensCount.WithLabelValues("l2").Inc()
 }
 
+func (m *Metrics) RecordHTTPRequest() {
+	m.HTTPRequestsCount.Inc()
+}
+
+func (m *Metrics) RecordHTTPResponse(code int, dur time.Duration) {
+	m.HTTPResponsesCount.WithLabelValues(strconv.Itoa(code)).Inc()
+	m.HTTPRequestDurationSecs.Observe(float64(dur) / float64(time.Second))
+}
+
 func (m *Metrics) Serve(hostname string, port uint64) (*http.Server, error) {
 	mux := http.NewServeMux()
 	mux.Handle("/metrics", promhttp.Handler())

go/indexer/server/server.go

@@ -6,6 +6,8 @@ import (
 	"runtime/debug"
 	"time"
 
+	"github.com/ethereum-optimism/optimism/go/indexer/metrics"
+
 	"github.com/ethereum/go-ethereum/log"
 )
 
@@ -50,7 +52,7 @@ func (rw *responseWriter) WriteHeader(code int) {
 }
 
 // LoggingMiddleware logs the incoming HTTP request & its duration.
-func LoggingMiddleware(logger log.Logger) func(http.Handler) http.Handler {
+func LoggingMiddleware(metrics *metrics.Metrics, logger log.Logger) func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		fn := func(w http.ResponseWriter, r *http.Request) {
 			defer func() {
@@ -64,16 +66,19 @@ func LoggingMiddleware(logger log.Logger) func(http.Handler) http.Handler {
 				}
 			}()
 
+			metrics.RecordHTTPRequest()
 			start := time.Now()
 			wrapped := wrapResponseWriter(w)
 			next.ServeHTTP(wrapped, r)
+			dur := time.Since(start)
 			logger.Info(
 				"served request",
 				"status", wrapped.status,
 				"method", r.Method,
 				"path", r.URL.EscapedPath(),
-				"duration", time.Since(start),
+				"duration", dur,
 			)
+			metrics.RecordHTTPResponse(wrapped.status, dur)
 		}
 
 		return http.HandlerFunc(fn)

go/indexer/services/airdrop.go

+package services
+
+import (
+	"net/http"
+
+	"github.com/ethereum-optimism/optimism/go/indexer/db"
+	"github.com/ethereum-optimism/optimism/go/indexer/metrics"
+	"github.com/ethereum-optimism/optimism/go/indexer/server"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/gorilla/mux"
+)
+
+var airdropLogger = log.New("service", "airdrop")
+
+type Airdrop struct {
+	db      *db.Database
+	metrics *metrics.Metrics
+}
+
+func NewAirdrop(db *db.Database, metrics *metrics.Metrics) *Airdrop {
+	return &Airdrop{
+		db:      db,
+		metrics: metrics,
+	}
+}
+
+func (a *Airdrop) GetAirdrop(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	address := vars["address"]
+	airdrop, err := a.db.GetAirdrop(common.HexToAddress(address))
+	if err != nil {
+		airdropLogger.Error("db error getting airdrop", "err", err)
+		server.RespondWithError(w, http.StatusInternalServerError, "database error")
+		return
+	}
+
+	if airdrop == nil {
+		server.RespondWithError(w, http.StatusNotFound, "airdrop not found")
+		return
+	}
+
+	server.RespondWithJSON(w, http.StatusOK, airdrop)
+}