Instrument backendA

pboyd · Aug 30, 2019 · 4eb87ce2530f8f41656b5ca65eb9f2318adc0514 · 4eb87ce
1 parent f0c2c22
commit 4eb87ce2530f8f41656b5ca65eb9f2318adc0514
Showing with 197 additions and 74 deletions.

+40 −36 backendA/airport.go

+3 −0 backendA/go.mod

+61 −0 backendA/go.sum

+2 −0 backendA/main.go

+51 −0 backendA/metrics.go

+40 −38 backendA/stats.go
diff --git a/backendA/airport.go b/backendA/airport.go
@@ -33,14 +33,15 @@ var airportType = graphql.NewObject(
 )
 
 func resolveAirportQuery(db *sql.DB) graphql.FieldResolveFn {
-	return func(p graphql.ResolveParams) (interface{}, error) {
-		code, _ := p.Args["code"].(string)
-		code = strings.ToUpper(code)
-		if !isAirportCode(code) {
-			return nil, nil
-		}
+	return graphQLMetrics("airport",
+		func(p graphql.ResolveParams) (interface{}, error) {
+			code, _ := p.Args["code"].(string)
+			code = strings.ToUpper(code)
+			if !isAirportCode(code) {
+				return nil, nil
+			}
 
-		row := db.QueryRow(`
+			row := db.QueryRow(`
 			SELECT
 				code, name, city, state, lat, lng
 			FROM
@@ -50,17 +51,18 @@ func resolveAirportQuery(db *sql.DB) graphql.FieldResolveFn {
 				code=?
 		`, code)
 
-		var a airport
-		err := row.Scan(&a.Code, &a.Name, &a.City, &a.State, &a.Latitude, &a.Longitude)
-		if err != nil {
-			if err == sql.ErrNoRows {
-				return nil, nil
+			var a airport
+			err := row.Scan(&a.Code, &a.Name, &a.City, &a.State, &a.Latitude, &a.Longitude)
+			if err != nil {
+				if err == sql.ErrNoRows {
+					return nil, nil
+				}
+				return nil, err
 			}
-			return nil, err
-		}
 
-		return &a, nil
-	}
+			return &a, nil
+		},
+	)
 }
 
 func isAirportCode(code string) bool {
@@ -78,15 +80,16 @@ func isAirportCode(code string) bool {
 }
 
 func resolveAirportList(db *sql.DB) graphql.FieldResolveFn {
-	return func(p graphql.ResolveParams) (interface{}, error) {
-		term, _ := p.Args["term"].(string)
-		if !checkAirportSearchTerm(term) {
-			return nil, nil
-		}
+	return graphQLMetrics("airport_list",
+		func(p graphql.ResolveParams) (interface{}, error) {
+			term, _ := p.Args["term"].(string)
+			if !checkAirportSearchTerm(term) {
+				return nil, nil
+			}
 
-		termLike := fmt.Sprintf("%%%s%%", term)
+			termLike := fmt.Sprintf("%%%s%%", term)
 
-		rows, err := db.Query(`
+			rows, err := db.Query(`
 			SELECT
 				code, name, city, state, lat, lng
 			FROM
@@ -98,24 +101,25 @@ func resolveAirportList(db *sql.DB) graphql.FieldResolveFn {
 					code LIKE ?
 				)
 		`, termLike, termLike, termLike)
-		if err != nil {
-			return nil, err
-		}
-		defer rows.Close()
-
-		results := []*airport{}
-		for rows.Next() {
-			var a airport
-			err := rows.Scan(&a.Code, &a.Name, &a.City, &a.State, &a.Latitude, &a.Longitude)
 			if err != nil {
 				return nil, err
 			}
+			defer rows.Close()
 
-			results = append(results, &a)
-		}
+			results := []*airport{}
+			for rows.Next() {
+				var a airport
+				err := rows.Scan(&a.Code, &a.Name, &a.City, &a.State, &a.Latitude, &a.Longitude)
+				if err != nil {
+					return nil, err
+				}
 
-		return results, nil
-	}
+				results = append(results, &a)
+			}
+
+			return results, nil
+		},
+	)
 }
 
 func checkAirportSearchTerm(term string) bool {

diff --git a/backendA/go.mod b/backendA/go.mod
@@ -3,7 +3,10 @@ module github.com/pboyd/flightranker-backend/backendA
 require (
 	github.com/go-sql-driver/mysql v1.4.1
 	github.com/graphql-go/graphql v0.7.8
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/pboyd/flightranker-backend/backendtest v0.0.0
+	github.com/prometheus/client_golang v1.1.0
 	google.golang.org/appengine v1.6.1 // indirect
 )
 

diff --git a/backendA/go.sum b/backendA/go.sum
@@ -1,24 +1,85 @@
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diff --git a/backendA/main.go b/backendA/main.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/go-sql-driver/mysql"
 	"github.com/graphql-go/graphql"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 func main() {
@@ -18,6 +19,7 @@ func main() {
 	}
 
 	http.Handle("/", graphqlHandler(db))
+	http.Handle("/metrics", promhttp.Handler())
 
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }

diff --git a/backendA/metrics.go b/backendA/metrics.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+	"github.com/graphql-go/graphql"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+func graphQLMetrics(name string, fn graphql.FieldResolveFn) graphql.FieldResolveFn {
+	requests := prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace: "graphql",
+		Subsystem: name,
+		Name:      "requests",
+	})
+	prometheus.MustRegister(requests)
+
+	errors := prometheus.NewCounter(prometheus.CounterOpts{
+		Namespace: "graphql",
+		Subsystem: name,
+		Name:      "errors",
+	})
+	prometheus.MustRegister(errors)
+
+	inflight := prometheus.NewGauge(prometheus.GaugeOpts{
+		Namespace: "graphql",
+		Subsystem: name,
+		Name:      "inflight",
+	})
+	prometheus.MustRegister(inflight)
+
+	responseTime := prometheus.NewHistogram(prometheus.HistogramOpts{
+		Namespace: "graphql",
+		Subsystem: name,
+		Name:      "response_time",
+	})
+	prometheus.MustRegister(responseTime)
+
+	return func(p graphql.ResolveParams) (r interface{}, err error) {
+		timer := prometheus.NewTimer(responseTime)
+		requests.Inc()
+		inflight.Inc()
+		defer func() {
+			timer.ObserveDuration()
+			inflight.Dec()
+
+			if err != nil {
+				errors.Inc()
+			}
+		}()
+		return fn(p)
+	}
+}
diff --git a/backendA/stats.go b/backendA/stats.go
@@ -30,44 +30,46 @@ var airlineStatsType = graphql.NewObject(
 )
 
 func resolveFlightStatsByAirline(db *sql.DB) graphql.FieldResolveFn {
-	return func(p graphql.ResolveParams) (interface{}, error) {
-		origin, _ := p.Args["origin"].(string)
-		origin = strings.ToUpper(origin)
-
-		dest, _ := p.Args["destination"].(string)
-		dest = strings.ToUpper(dest)
-
-		if !isAirportCode(origin) || !isAirportCode(dest) {
-			return nil, nil
-		}
-
-		stats, err := airlineFlightInfo(p.Context, db, origin, dest)
-		if err != nil {
-			return nil, err
-		}
-
-		delays, err := delaysByAirline(p.Context, db, origin, dest)
-		if err != nil {
-			return nil, err
-		}
-
-		for code := range stats {
-			stats[code].OnTimePercentage = (1.0 - float64(delays[code])/float64(stats[code].TotalFlights)) * 100
-		}
-
-		statsRows := make([]*airlineStats, len(stats))
-		i := 0
-		for code := range stats {
-			statsRows[i] = stats[code]
-			i++
-		}
-
-		sort.Slice(statsRows, func(i, j int) bool {
-			return statsRows[j].OnTimePercentage < statsRows[i].OnTimePercentage
-		})
-
-		return statsRows, nil
-	}
+	return graphQLMetrics("flightstats_by_airline",
+		func(p graphql.ResolveParams) (interface{}, error) {
+			origin, _ := p.Args["origin"].(string)
+			origin = strings.ToUpper(origin)
+
+			dest, _ := p.Args["destination"].(string)
+			dest = strings.ToUpper(dest)
+
+			if !isAirportCode(origin) || !isAirportCode(dest) {
+				return nil, nil
+			}
+
+			stats, err := airlineFlightInfo(p.Context, db, origin, dest)
+			if err != nil {
+				return nil, err
+			}
+
+			delays, err := delaysByAirline(p.Context, db, origin, dest)
+			if err != nil {
+				return nil, err
+			}
+
+			for code := range stats {
+				stats[code].OnTimePercentage = (1.0 - float64(delays[code])/float64(stats[code].TotalFlights)) * 100
+			}
+
+			statsRows := make([]*airlineStats, len(stats))
+			i := 0
+			for code := range stats {
+				statsRows[i] = stats[code]
+				i++
+			}
+
+			sort.Slice(statsRows, func(i, j int) bool {
+				return statsRows[j].OnTimePercentage < statsRows[i].OnTimePercentage
+			})
+
+			return statsRows, nil
+		},
+	)
 }
 
 func airlineFlightInfo(ctx context.Context, db *sql.DB, origin, dest string) (map[string]*airlineStats, error) {