Configurable num of goroutines, bug fixes

Dockerfile

@@ -5,6 +5,7 @@ WORKDIR /build/
 COPY main.go .
 COPY go.mod .
 RUN GOOS=linux CGO_ENABLED=0 go build -a -installsuffix cgo -o feed_archiver .
+RUN strip feed_archiver
 
 FROM scratch
 

main.go

@@ -10,11 +10,13 @@ import (
 	"github.com/valyala/fastjson"
 	"os"
 	"strings"
+	"sync"
 	"time"
 )
 
 var archiverCtx struct {
 	tables map[string]bool
+	m      sync.RWMutex
 }
 
 var pool *pgx.ConnPool
@@ -27,6 +29,7 @@ type FeedArchiverArgs struct {
 	DbDatabase string
 	RedisAddr  string
 	Pattern    string
+	Threads    int
 }
 
 func main() {
@@ -77,6 +80,13 @@ func main() {
 			Destination: &args.Pattern,
 			EnvVars:     []string{"FA_PATTERN"},
 		},
+		&cli.IntFlag{
+			Name:        "threads",
+			Usage:       "number of threads",
+			Value:       5,
+			Destination: &args.Threads,
+			EnvVars:     []string{"FA_THREADS"},
+		},
 	}
 
 	app.Action = func(c *cli.Context) error {
@@ -92,7 +102,7 @@ func main() {
 				Password: args.DbPassword,
 				Database: args.DbDatabase,
 			},
-			MaxConnections: 5,
+			MaxConnections: args.Threads,
 		}
 
 		var err error
@@ -107,7 +117,7 @@ func main() {
 			DB:       0,
 		})
 
-		for i := 1; i <= 5; i++ {
+		for i := 1; i <= args.Threads; i++ {
 			var parser fastjson.Parser
 			go dispatchFromQueue(
 				rdb,
@@ -158,7 +168,9 @@ func archive(parser fastjson.Parser, table string, json string) {
 		id, _ = idValue.StringBytes()
 	}
 
+	archiverCtx.m.RLock()
 	_, tableExists := archiverCtx.tables[table]
+	archiverCtx.m.RUnlock()
 	if !tableExists {
 		createTable(table, idValue.Type())
 	}
@@ -192,15 +204,17 @@ func createTable(table string, idType fastjson.Type) {
 
 	_, err = pool.Exec(fmt.Sprintf("CREATE table IF NOT EXISTS %s ("+
 		"id %s PRIMARY KEY,"+
-		"archived_on TIMESTAMP DEFAULT CURRENT_TIMESTAMP,"+
+		"archived_on TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL,"+
-		"data JSONB"+
+		"data JSONB NOT NULL"+
 		")", table, strType))
 
 	if err != nil {
 		logrus.WithError(err).Error("Error during create table")
 	}
 
+	archiverCtx.m.Lock()
 	archiverCtx.tables[table] = true
+	archiverCtx.m.Unlock()
 }
 
 var keyCache []string = nil
@@ -228,10 +242,11 @@ func dispatchFromQueue(rdb *redis.Client, pattern string, consume func(message s
 		keys := getKeys(ctx, rdb, pattern)
 		if len(keys) == 0 {
 			time.Sleep(time.Second * 1)
+			keyCache = nil
 			continue
 		}
 
-		rawTask, err := rdb.BLPop(ctx, time.Second*30, keys...).Result()
+		rawTask, err := rdb.BLPop(ctx, time.Second, keys...).Result()
 		if err != nil {
 			keyCache = nil
 			continue