atmost working example

.gitignore

@@ -0,0 +1 @@
+bin/*

Dockerfile

@@ -1,17 +1,23 @@
 FROM golang:1.22-alpine as golang
 
-WORKDIR /app
+ARG VERSION="unknown"
+ARG REVISION="unknown"
+ARG BUILDTIME=""
+
+WORKDIR /go/src/git.loyso.art/frx/devsim
 COPY . .
 
-RUN go mod download && go mod verify && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /server .
+RUN go mod download && \
+  go mod verify && \
+  CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "-w -s -X 'git.loyso.art/frx/devsim.Version=${VERSION}' -X 'git.loyso.art/frx/devsim.Revision=${REVISION}' -X 'git.loyso.art/frx/devsim.BuildTime=${BUILDTIME}'" \
+  -o /go/bin/app /go/src/git.loyso.art/frx/devsim/cmd/web/main.go
 
 FROM gcr.io/distroless/static-debian12@sha256:ce46866b3a5170db3b49364900fb3168dc0833dfb46c26da5c77f22abb01d8c3
 
-WORKDIR /app
-COPY --from=golang /server .
+COPY --from=golang /go/bin/app /app
 
-EXPOSE 9123
-ENV DEVSIM_HTTP_ADDR=":9123"
+ENV DEVSIM_HTTP_ADDR=":80"
+EXPOSE 80
 
-CMD ["/server"]
+ENTRYPOINT ["/app"]
 

assets/db/queries.sql

@@ -0,0 +1,28 @@
+-- name: UpsertDeviceMetrics :exec
+INSERT INTO public.stats(
+  device_id,
+  inc_traffic,
+  out_traffic,
+  inc_rps,
+  write_rps,
+  read_rps,
+  updated_at
+) VALUES (
+  @device_id,
+  @inc_traffic,
+  @out_traffic,
+  @inc_rps,
+  @write_rps,
+  @read_rps,
+  NOW()
+) ON CONFLICT(device_id) DO UPDATE SET
+device_id = EXCLUDED.device_id,
+inc_traffic = EXCLUDED.inc_traffic,
+out_traffic = EXCLUDED.out_traffic,
+inc_rps = EXCLUDED.inc_rps,
+write_rps = EXCLUDED.write_rps,
+read_rps = EXCLUDED.read_rps,
+updated_at = NOW();
+
+-- name: ListDeviceStats :many
+SELECT * FROM public.stats;

assets/db/schema.sql

@@ -0,0 +1,12 @@
+CREATE TABLE IF NOT EXISTS public.stats (
+  device_id TEXT NOT NULL,
+  inc_traffic INT NOT NULL DEFAULT 0,
+  out_traffic INT NOT NULL DEFAULT 0,
+  inc_rps INT NOT NULL DEFAULT 0,
+  read_rps INT NOT NULL DEFAULT 0,
+  write_rps INT NOT NULL DEFAULT 0,
+  updated_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW()
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS
+  stats_by_device_id_idx ON public.stats(device_id);

buildinfo.go

@@ -0,0 +1,19 @@
+package devsim
+
+var (
+	version   string
+	revision  string
+	buildTime string
+)
+
+func Version() string {
+	return version
+}
+
+func Revision() string {
+	return revision
+}
+
+func BuildTime() string {
+	return buildTime
+}

cmd/simulator/main.go

@@ -0,0 +1,145 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+	"os/signal"
+	"strconv"
+	"sync/atomic"
+	"time"
+
+	"golang.org/x/sync/errgroup"
+
+	"git.loyso.art/frx/devsim/internal/entities"
+	"git.loyso.art/frx/devsim/internal/interconnect/collector"
+)
+
+var requestsDone = atomic.Uint64{}
+
+func requestReporter(ctx context.Context) {
+	ticker := time.Tick(time.Second)
+	for {
+		select {
+		case <-ticker:
+		case <-ctx.Done():
+			return
+		}
+		requests := requestsDone.Swap(0)
+		log.Printf("rps: %d", requests)
+	}
+}
+
+func main() {
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer cancel()
+
+	dstAddr := os.Getenv("DEVSIM_HTTP_ADDR")
+	deviceCountStr := os.Getenv("DEVSIM_DEVICE_COUNT")
+	delayStr := os.Getenv("DEVSIM_REQUEST_DELAY")
+
+	deviceCount, err := strconv.Atoi(deviceCountStr)
+	if err != nil {
+		log.Fatalf("parsing device count: %v", err)
+	}
+
+	if dstAddr == "" {
+		log.Fatal("no destination address provided")
+	}
+
+	delay, err := time.ParseDuration(delayStr)
+	if err != nil {
+		log.Fatalf("parsing delay duration: %v", err)
+	}
+
+	log.Printf("running application with settings: destination=%s device_count=%d delay=%s", dstAddr, deviceCount, delay)
+
+	client, err := collector.New(dstAddr)
+	if err != nil {
+		log.Fatalf("unable to create collector http client: %v", err)
+	}
+
+	eg, egctx := errgroup.WithContext(ctx)
+
+	eg.Go(func() error {
+		requestReporter(egctx)
+		return nil
+	})
+
+	for i := 0; i < deviceCount; i++ {
+		dh := newDeviceHandler(i+1, delay, client)
+		eg.Go(func() error {
+			dh.loop(egctx)
+			return nil
+		})
+	}
+
+	err = eg.Wait()
+	if err != nil {
+		log.Printf("error during execution: %v", err)
+		cancel()
+	}
+}
+
+type deviceHandler struct {
+	stats  entities.DeviceStatistics
+	client collector.Client
+	delay  time.Duration
+}
+
+func newDeviceHandler(id int, delay time.Duration, client collector.Client) *deviceHandler {
+	deviceID := entities.DeviceID(strconv.Itoa(id))
+	dh := deviceHandler{
+		delay:  delay,
+		client: client,
+	}
+	dh.stats.ID = deviceID
+
+	return &dh
+}
+
+func (h *deviceHandler) loop(ctx context.Context) {
+	failedCount := 0
+
+	for {
+		start := time.Now()
+
+		h.stats.IncomingTrafficBytes++
+		h.stats.OutgoingTrafficBytes++
+
+		h.stats.WriteRPS = (h.stats.WriteRPS + 2) % 255
+		h.stats.ReadRPS = (h.stats.ReadRPS + 1) % 255
+		h.stats.IncomingRPS = h.stats.WriteRPS + h.stats.ReadRPS
+
+		err := h.client.Upsert(ctx, h.stats)
+		if err != nil {
+			log.Printf("%q: unable to upsert metrics: %v", h.stats.ID, err)
+			failedCount++
+			if failedCount > 10 {
+				log.Println("too much fails, exiting")
+				return
+			}
+
+			continue
+		}
+
+		requestsDone.Add(1)
+
+		failedCount = 0
+		elapsed := time.Since(start)
+		left := h.delay - elapsed
+
+		if left > 0 {
+			select {
+			case <-ctx.Done():
+				return
+			case <-time.After(left):
+				continue
+			}
+		} else {
+			if ctx.Err() != nil {
+				return
+			}
+		}
+	}
+}

cmd/web/main.go

@@ -9,12 +9,14 @@ import (
 	"os"
 	"os/signal"
 
+	"golang.org/x/sync/errgroup"
+
+	"git.loyso.art/frx/devsim"
 	"git.loyso.art/frx/devsim/internal/api/http"
 	"git.loyso.art/frx/devsim/internal/store"
 	"git.loyso.art/frx/devsim/internal/store/mongo"
 	"git.loyso.art/frx/devsim/internal/store/pg"
 	"git.loyso.art/frx/devsim/pkg/collections"
-	"golang.org/x/sync/errgroup"
 )
 
 var availableStoreTypes = collections.NewSet([]string{
@@ -25,20 +27,33 @@ func main() {
 	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
 	defer cancel()
 
-	log := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{}))
+	log := slog.New(slog.NewJSONHandler(io.Discard, &slog.HandlerOptions{
+		Level: slog.LevelInfo,
+	}))
 
-	var settings applicationSettings
-	settings.fromEnv()
+	log.InfoContext(
+		ctx, "running application",
+		slog.Int("pid", os.Getpid()),
+		slog.String("version", devsim.Version()),
+		slog.String("revision", devsim.Revision()),
+		slog.String("buildtime", devsim.BuildTime()),
+	)
 
+	settings := loadConfigFromEnv()
 	err := settings.validate()
 	if err != nil {
-		log.ErrorContext(ctx, "unable to validate settings", slog.Any("err", err))
+		log.ErrorContext(ctx, "unable to validate settings", slog.String("err", err.Error()))
 		os.Exit(1)
 	}
 
+	log.InfoContext(
+		ctx, "config parsed",
+		slog.Any("settings", settings),
+	)
+
 	err = app(ctx, settings, log)
 	if err != nil {
-		log.ErrorContext(ctx, "unable to run app", slog.Any("err", err))
+		log.ErrorContext(ctx, "unable to run app", slog.String("err", err.Error()))
 		os.Exit(1)
 	}
 }
@@ -71,19 +86,20 @@ type applicationSettings struct {
 	mongo mongoSettings
 }
 
-func (s *applicationSettings) fromEnv() {
+func loadConfigFromEnv() applicationSettings {
 	const webaddr = ":9123"
 
-	*s = applicationSettings{
-		listenAddr: valueOrDefault(os.Getenv("DEVSIM_HTTP_ADDR"), webaddr),
-		storeType:  os.Getenv("DEVSIM_STORE_TYPE"),
-	}
+	var cfg applicationSettings
+	cfg.listenAddr = valueOrDefault(os.Getenv("DEVSIM_HTTP_ADDR"), webaddr)
+	cfg.storeType = os.Getenv("DEVSIM_STORE_TYPE")
 
-	s.pg.fromEnv()
-	s.mongo.fromEnv()
+	cfg.pg.fromEnv()
+	cfg.mongo.fromEnv()
+
+	return cfg
 }
 
-func (s *applicationSettings) validate() (err error) {
+func (s applicationSettings) validate() (err error) {
 	if !availableStoreTypes.Contains(s.storeType) {
 		err = errors.Join(err, errors.New("store_type value is unsupported"))
 	}
@@ -117,9 +133,9 @@ func app(ctx context.Context, settings applicationSettings, log *slog.Logger) (e
 
 	switch settings.storeType {
 	case "pg":
-		pgconn, err := pg.Dial(ctx, settings.pg.DSN)
-		if err != nil {
-			return fmt.Errorf("connecting to postgres: %w", err)
+		pgconn, errDial := pg.Dial(ctx, settings.pg.DSN)
+		if errDial != nil {
+			return fmt.Errorf("connecting to postgres: %w", errDial)
 		}
 
 		repo = pgconn.StatsRepository()
@@ -128,9 +144,9 @@ func app(ctx context.Context, settings applicationSettings, log *slog.Logger) (e
 			closer: pgconn,
 		})
 	case "mongo":
-		mongoconn, err := mongo.Dial(ctx, settings.mongo.DSN)
-		if err != nil {
-			return fmt.Errorf("connecting to mongo: %w", err)
+		mongoconn, errDial := mongo.Dial(ctx, settings.mongo.DSN)
+		if errDial != nil {
+			return fmt.Errorf("connecting to mongo: %w", errDial)
 		}
 
 		repo = mongoconn.StatsRepository()

compose.yaml

@@ -0,0 +1,33 @@
+services:
+  web.mongo:
+    image: git.loyso.art/devsim:latest
+    ports:
+      - 9124:80
+    depends_on:
+      - postgres
+      - mongo
+    environment:
+      DEVSIM_MONGO_DSN: mongodb://mongo
+      DEVSIM_STORE_TYPE: mongo
+
+  web.pg:
+    image: git.loyso.art/devsim:latest
+    ports:
+      - 9123:80
+    depends_on:
+      - postgres
+      - mongo
+    environment:
+      DEVSIM_PG_DSN: "postgres://devsim:devsim@postgres:5432/devsim?sslmode=disable"
+      DEVSIM_STORE_TYPE: pg
+
+  postgres:
+    image: postgres:15-alpine
+    environment:
+      POSTGRES_DB: devsim
+      POSTGRES_PASSWORD: devsim
+      POSTGRES_USER: devsim
+    ports: ["5432:5432"]
+
+  mongo:
+    image: mongo:7

internal/api/http/middlewares.go

@@ -44,7 +44,7 @@ func middlewareLogger(log *slog.Logger) middlewareFunc {
 			path := r.URL.Path
 			query := r.URL.Query().Encode()
 
-			log.InfoContext(
+			log.DebugContext(
 				r.Context(), "request processing",
 				slog.String("request_id", requestID),
 				slog.String("method", method),
@@ -54,10 +54,9 @@ func middlewareLogger(log *slog.Logger) middlewareFunc {
 
 			next.ServeHTTP(w, r)
 
-			elapsed := time.Since(start)
 			log.InfoContext(
 				r.Context(), "request finished",
-				slog.Duration("elapsed", elapsed.Truncate(time.Millisecond)),
+				slog.Int64("elapsed", time.Since(start).Milliseconds()),
 			)
 		})
 	}

internal/interconnect/collector/client.go

@@ -0,0 +1,86 @@
+package collector
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"text/template"
+	"time"
+
+	"git.loyso.art/frx/devsim/internal/entities"
+)
+
+type upsertRequest struct {
+	IncomingTraffic int `json:"incoming_traffic"`
+	OutgoingTraffic int `json:"outgoing_traffic"`
+	IncomingRPS     int `json:"incoming_rps"`
+	ReadRPS         int `json:"read_rps"`
+	WriteRPS        int `json:"write_rps"`
+}
+
+type Client interface {
+	Upsert(context.Context, entities.DeviceStatistics) error
+}
+
+type client struct {
+	httpClient *http.Client
+	baseurl    string
+}
+
+func New(addr string) (*client, error) {
+	hc := &http.Client{
+		Transport: &http.Transport{
+			Proxy: http.ProxyFromEnvironment,
+			DialContext: (&net.Dialer{
+				Timeout:   time.Second * 10,
+				KeepAlive: time.Second * 30,
+			}).DialContext,
+			MaxIdleConns:          10,
+			IdleConnTimeout:       time.Second * 90,
+			TLSHandshakeTimeout:   time.Second * 5,
+			ExpectContinueTimeout: time.Second * 1,
+			ForceAttemptHTTP2:     true,
+		},
+		Timeout: time.Second * 10,
+	}
+
+	return &client{
+		httpClient: hc,
+		baseurl:    addr,
+	}, nil
+}
+
+var upsertRequestTemplate = template.Must(template.New("request").Parse(`{"incoming_traffic":{{.IncomingTrafficBytes}},"outgoing_traffic":{{.OutgoingTrafficBytes}},"incoming_rps":{{.IncomingRPS}},"read_rps":{{.ReadRPS}},"write_rps":{{.WriteRPS}}}`))
+
+func (c *client) Upsert(ctx context.Context, stat entities.DeviceStatistics) error {
+	var buf bytes.Buffer
+	err := upsertRequestTemplate.Lookup("request").Execute(&buf, stat)
+	if err != nil {
+		return fmt.Errorf("executing template: %w", err)
+	}
+
+	path := c.baseurl + "/api/v1/stats/" + string(stat.ID)
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, path, &buf)
+	if err != nil {
+		return fmt.Errorf("preparing http request: %w", err)
+	}
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("executing request: %w", err)
+	}
+
+	if resp.StatusCode == http.StatusOK {
+		return nil
+	}
+
+	data, err := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
+	if err != nil {
+		return fmt.Errorf("reading body by status code %d: %w", resp.StatusCode, err)
+	}
+
+	return fmt.Errorf("expected status 200 got %d with body: %q", resp.StatusCode, data)
+}

internal/store/pg/queries/db.go

@@ -0,0 +1,32 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.26.0
+
+package queries
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+)
+
+type DBTX interface {
+	Exec(context.Context, string, ...interface{}) (pgconn.CommandTag, error)
+	Query(context.Context, string, ...interface{}) (pgx.Rows, error)
+	QueryRow(context.Context, string, ...interface{}) pgx.Row
+}
+
+func New(db DBTX) *Queries {
+	return &Queries{db: db}
+}
+
+type Queries struct {
+	db DBTX
+}
+
+func (q *Queries) WithTx(tx pgx.Tx) *Queries {
+	return &Queries{
+		db: tx,
+	}
+}

internal/store/pg/queries/models.go

@@ -0,0 +1,19 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.26.0
+
+package queries
+
+import (
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+type Stat struct {
+	DeviceID   string
+	IncTraffic int32
+	OutTraffic int32
+	IncRps     int32
+	ReadRps    int32
+	WriteRps   int32
+	UpdatedAt  pgtype.Timestamp
+}

internal/store/pg/queries/queries.sql.go

@@ -0,0 +1,90 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.26.0
+// source: queries.sql
+
+package queries
+
+import (
+	"context"
+)
+
+const listDeviceStats = `-- name: ListDeviceStats :many
+SELECT device_id, inc_traffic, out_traffic, inc_rps, read_rps, write_rps, updated_at FROM public.stats
+`
+
+func (q *Queries) ListDeviceStats(ctx context.Context) ([]Stat, error) {
+	rows, err := q.db.Query(ctx, listDeviceStats)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []Stat
+	for rows.Next() {
+		var i Stat
+		if err := rows.Scan(
+			&i.DeviceID,
+			&i.IncTraffic,
+			&i.OutTraffic,
+			&i.IncRps,
+			&i.ReadRps,
+			&i.WriteRps,
+			&i.UpdatedAt,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const upsertDeviceMetrics = `-- name: UpsertDeviceMetrics :exec
+INSERT INTO public.stats(
+  device_id,
+  inc_traffic,
+  out_traffic,
+  inc_rps,
+  write_rps,
+  read_rps,
+  updated_at
+) VALUES (
+  $1,
+  $2,
+  $3,
+  $4,
+  $5,
+  $6,
+  NOW()
+) ON CONFLICT(device_id) DO UPDATE SET
+device_id = EXCLUDED.device_id,
+inc_traffic = EXCLUDED.inc_traffic,
+out_traffic = EXCLUDED.out_traffic,
+inc_rps = EXCLUDED.inc_rps,
+write_rps = EXCLUDED.write_rps,
+read_rps = EXCLUDED.read_rps,
+updated_at = NOW()
+`
+
+type UpsertDeviceMetricsParams struct {
+	DeviceID   string
+	IncTraffic int32
+	OutTraffic int32
+	IncRps     int32
+	WriteRps   int32
+	ReadRps    int32
+}
+
+func (q *Queries) UpsertDeviceMetrics(ctx context.Context, arg UpsertDeviceMetricsParams) error {
+	_, err := q.db.Exec(ctx, upsertDeviceMetrics,
+		arg.DeviceID,
+		arg.IncTraffic,
+		arg.OutTraffic,
+		arg.IncRps,
+		arg.WriteRps,
+		arg.ReadRps,
+	)
+	return err
+}

internal/store/pg/store.go

@@ -5,9 +5,10 @@ import (
 	"fmt"
 	"time"
 
-	"git.loyso.art/frx/devsim/internal/entities"
-
 	"github.com/jackc/pgx/v5/pgxpool"
+
+	"git.loyso.art/frx/devsim/internal/entities"
+	"git.loyso.art/frx/devsim/internal/store/pg/queries"
 )
 
 func Dial(ctx context.Context, addr string) (*repository, error) {
@@ -66,93 +67,38 @@ func (s deviceStatsDB) asDomain() entities.DeviceStatistics {
 }
 
 func (r statsRepository) Upsert(ctx context.Context, stats entities.DeviceStatistics) error {
-	const query = `INSERT INTO public.stats (
-			device_id,
-			inc_traffic,
-			out_traffic,
-			inc_rps, 
-			read_rps,
-			write_rps,
-			updated_at
-		) VALUES (
-			$1,
-			$2,
-			$3,
-			$4,
-			$5,
-			$6,
-			$7,
-		) ON CONFLICT(device_id) DO UPDATE SET
-			inc_traffic = EXCLUDED.inc_traffic,
-			out_traffic = EXCLUDED.out_traffic,
-			inc_rps = EXCLUDED.inc_rps,
-			read_rps = EXCLUDED.read_rps,
-			write_rps = EXCLUDED.write_rps,
-			updated_at = EXCLUDED.updated_at
-		RETURNING id;
-	`
-
-	_, err := r.db.Exec(
-		ctx, query,
-		stats.ID,
-		stats.IncomingTrafficBytes,
-		stats.OutgoingTrafficBytes,
-		stats.IncomingRPS,
-		stats.ReadRPS,
-		stats.WriteRPS,
-	)
+	err := queries.New(r.db).UpsertDeviceMetrics(ctx, queries.UpsertDeviceMetricsParams{
+		DeviceID:   string(stats.ID),
+		IncTraffic: int32(stats.IncomingTrafficBytes),
+		OutTraffic: int32(stats.OutgoingTrafficBytes),
+		IncRps:     int32(stats.IncomingRPS),
+		WriteRps:   int32(stats.WriteRPS),
+		ReadRps:    int32(stats.ReadRPS),
+	})
 	if err != nil {
-		return fmt.Errorf("executing query: %w", err)
+		return fmt.Errorf("upserting device metrics: %w", err)
 	}
 
 	return nil
 }
 
 func (r statsRepository) List(ctx context.Context) (out []entities.DeviceStatistics, err error) {
-	var count int
-	err = r.db.QueryRow(ctx, `SELECT COUNT(device_id) FROM public.stats`).Scan(&count)
+	stats, err := queries.New(r.db).ListDeviceStats(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("getting count: %w", err)
+		return nil, fmt.Errorf("listing device stats: %w", err)
 	}
 
-	out = make([]entities.DeviceStatistics, 0, count)
+	out = make([]entities.DeviceStatistics, len(stats))
 
-	const query = `SELECT
-		device_id,
-		inc_traffic,
-		out_traffic,
-		inc_rps, 
-		read_rps,
-		write_rps,
-		updated_at
-	FROM public.stats;
-	`
-
-	rows, err := r.db.Query(ctx, query)
-	if err != nil {
-		return nil, fmt.Errorf("querying: %w", err)
-	}
-	defer rows.Close()
-
-	for rows.Next() {
-		var stat deviceStatsDB
-		err = rows.Scan(
-			&stat.DeviceID,
-			&stat.IncomingTraffic,
-			&stat.OutgoingTraffic,
-			&stat.IncomingRPS,
-			&stat.ReadRPS,
-			&stat.WriteRPS,
-			&stat.UpdatedAt,
-		)
-		if err != nil {
-			return nil, fmt.Errorf("scanning row: %w", err)
+	for i, stat := range stats {
+		out[i] = entities.DeviceStatistics{
+			IncomingTrafficBytes: int(stat.IncTraffic),
+			OutgoingTrafficBytes: int(stat.OutTraffic),
+			IncomingRPS:          int(stat.IncRps),
+			WriteRPS:             int(stat.WriteRps),
+			ReadRPS:              int(stat.ReadRps),
+			UpdatedAt:            stat.UpdatedAt.Time,
 		}
-
-		out = append(out, stat.asDomain())
-	}
-	if err = rows.Err(); err != nil {
-		return nil, fmt.Errorf("checking rows err: %w", err)
 	}
 
 	return out, nil

makefile

@@ -0,0 +1,17 @@
+VERSION=$(shell git tag --sort=v:refname 2>/dev/null | head -n1)
+REVISION=$(shell git rev-parse --short HEAD)
+BUILDTIME=$(shell date -u +%FT%T)
+
+build.docker:
+	docker build\
+		--build-arg VERSION=${VERSION}\
+		--build-arg REVISION=${REVISION}\
+		--build-arg BUILDTIME=${BUILDTIME}\
+		-t git.loyso.art/devsim:latest\
+		.
+
+build:
+	CGO_ENABALED=0 go build \
+	-ldflags "-w -s -X 'git.loyso.art/frx/devsim.version=${VERSION}' -X 'git.loyso.art/frx/devsim.revision=${REVISION}' -X 'git.loyso.art/frx/devsim.buildTime=${BUILDTIME}Z'" \
+	-o bin/web ./cmd/web/*.go
+

sqlc.yaml

@@ -0,0 +1,10 @@
+version: "2"
+sql:
+  - engine: "postgresql"
+    queries: "assets/db/queries.sql"
+    schema: "assets/db/schema.sql"
+    gen:
+      go:
+        package: "queries"
+        out: "internal/store/pg/queries"
+        sql_package: "pgx/v5"