DBService object to class with logger injection

src/main/scala/db/DBService.scala

@@ -2,6 +2,8 @@ package db
 
 import cats.effect.{IO, Resource}
 import cats.implicits.toTraverseOps
+import org.typelevel.log4cats.Logger
+import org.typelevel.log4cats.slf4j.Slf4jLogger
 
 import java.io.File
 import java.nio.file.{Files, Paths}
@@ -11,6 +13,12 @@ import scala.io.Source
 import scala.util.Try
 
 object DBService {
+  def of: IO[DBService] = {
+    Slf4jLogger.create[IO].map(logger => new DBService(logger))
+  }
+}
+
+class DBService(log: Logger[IO]) {
   private val dateFormatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmm")
   private val dataPath = "./data"
 

src/main/scala/db/Main.scala

@@ -3,7 +3,6 @@ package db
 import cats.effect.IO
 import cats.effect.unsafe.implicits.global
 import cats.implicits.toTraverseOps
-import db.DBService
 
 import java.time.{LocalDate, LocalDateTime}
 import java.time.format.DateTimeFormatter
@@ -16,21 +15,24 @@ object Main {
     val to = LocalDateTime.parse("20230501_1230", dateFormatter)
 
     for {
-      lines <- DBService.getInRange(from, to)
+      dbService <- DBService.of
+      lines <- dbService.getInRange(from, to)
       _ <- lines.traverse(IO.println)
     } yield ()
   }
 
   private def testGetDates: IO[Unit] = {
     for {
-      dates <- DBService.getDates()
+      dbService <- DBService.of
+      dates <- dbService.getDates()
       _ <- IO.println(dates)
     } yield ()
   }
 
   private def testGetDate: IO[Unit] = {
     for {
-      dates <- DBService.getDateFileNames(LocalDate.of(2023, 4, 23))
+      dbService <- DBService.of
+      dates <- dbService.getDateFileNames(LocalDate.of(2023, 4, 23))
       _ <- IO.println(dates)
     } yield ()
   }

src/main/scala/fetch/Main.scala

@@ -5,7 +5,7 @@ import cats.effect.unsafe.implicits.global
 import cats.implicits.toTraverseOps
 import db.DBService
 
-import java.time.{LocalDate, LocalDateTime}
+import java.time.LocalDateTime
 
 object Main {
   def run: IO[Unit] = {
@@ -17,7 +17,8 @@ object Main {
       fetchServiceError = fetchResultEither.left.toOption.map(e => s"FetchServiceError: ${e.getMessage}").toList
       fetchResult = fetchResultEither.getOrElse(List.empty)
       (fetchErrors, successDownloads) = fetchResult.partitionMap(identity)
-      saveResults <- successDownloads.traverse { case (name, content) => DBService.save(name, content) }
+      dbService <- DBService.of
+      saveResults <- successDownloads.traverse { case (name, content) => dbService.save(name, content) }
       (saveErrors, successSaves) = saveResults.partitionMap(identity)
       successes = successDownloads.map(s => s"fetched: ${s._1}") ++ successSaves.map(s => s"saved: $s")
       errors = fetchServiceError ++ fetchErrors.map(e => s"FetchError: ${e.getMessage}") ++ saveErrors.map(e => s"SaveError: ${e.getMessage}")

src/main/scala/parse/Main.scala

@@ -2,6 +2,7 @@ package parse
 
 import cats.effect.IO
 import cats.effect.unsafe.implicits.global
+import db.DBService
 import io.circe.syntax.EncoderOps
 import parse.Aggregate.AggregateValueImplicits.aggregateValueEncoder
 import parse.Aggregate.{AggregateKey, UserQuery}
@@ -19,7 +20,8 @@ object Main {
     val userQuery = UserQuery(List("Rīga"), "tempAvg", AggregateKey.List)
 
     for {
-      lines <- db.DBService.getInRange(from, to)
+      dbService <- DBService.of
+      lines <- dbService.getInRange(from, to)
       parsed <- IO.pure(Parser.queryData(userQuery, lines))
       _ <- IO.println(parsed.asJson)
     } yield ()

src/main/scala/server/Main.scala

@@ -6,19 +6,21 @@ import fetch.{FetchService, FileNameService}
 
 object Main extends IOApp {
   def run(args: List[String]): IO[ExitCode] = {
-    // TODO looks like fetchTask fails server if no csv on meteo server
+    for {
-    val fetchTask = FileNameService.generateCurrentHour.flatMap(FetchService.fetchSingleFile)
+      dbService <- DBService.of
-    val scheduler = Scheduler.scheduleTask(fetchTask)
+      fetchTask = FileNameService.generateCurrentHour.flatMap(FetchService.fetchSingleFile)
+      scheduler = Scheduler.scheduleTask(fetchTask)
         .evalMap { case (name, content) =>
           IO(println(s"fetched: $name")) *>
-          DBService.save(name, content).attempt.flatMap {
+            dbService.save(name, content).attempt.flatMap {
               case Right(savedName) => IO(println(s"File saved: $savedName"))
               case Left(err) => IO(println(s"Error: $err"))
             }
         }.compile.drain // Convert Stream[IO, Unit] to IO[Unit]
 
-    val server = Server.run // This is an IO[Server]
+      server = Server.run // This is an IO[Server]
 
-    (server, scheduler).parMapN((_, _) => ExitCode.Success)
+      exitCode <- (server, scheduler).parMapN((_, _) => ExitCode.Success)
+    } yield exitCode
   }
 }

src/main/scala/server/Server.scala

@@ -38,9 +38,9 @@ object Server {
 
     // http://0.0.0.0:8080/api/query/20230414_2200-20230501_1230/Liepāja,Rēzekne/tempMax/max
     case GET -> Root / "query" / DateTimeRange(from, to) / CityList(cities) / field / AggKey(key) =>
-      DBService.getInRange(from, to)
+      DBService.of.flatMap(_.getInRange(from, to)
         .map(Parser.queryData(UserQuery(cities, field, key), _))
-        .flatMap(result => Ok(result.asJson.pretty))
+        .flatMap(result => Ok(result.asJson.pretty)))
 
     // http://0.0.0.0:8080/api/fetch/date/20230514
     case GET -> Root / "fetch" / "date" / ValidDate(date) =>
@@ -49,7 +49,8 @@ object Server {
         fetchServiceError = fetchResultEither.left.toOption.map(e => s"FetchServiceError: ${e.getMessage}").toList
         fetchResult = fetchResultEither.getOrElse(List.empty)
         (fetchErrors, successDownloads) = fetchResult.partitionMap(identity)
-        saveResults <- successDownloads.traverse { case (name, content) => DBService.save(name, content) }
+        dbService <- DBService.of
+        saveResults <- successDownloads.traverse { case (name, content) => dbService.save(name, content) }
         (saveErrors, successSaves) = saveResults.partitionMap(identity)
 //        successes = successDownloads.map(s => s"fetched: ${s._1}") ++ successSaves.map(s => s"saved: $s")
         successes = successSaves
@@ -67,19 +68,19 @@ object Server {
 
     // http://0.0.0.0:8080/api/show/all_dates
     case GET -> Root / "show" / "all_dates" =>
-      DBService.getDates().flatMap(dates =>
+      DBService.of.flatMap(_.getDates().flatMap(dates =>
         Ok(dates.asJson.pretty)
-      )
+      ))
 
     // http://0.0.0.0:8080/api/show/date/20230423
     case GET -> Root / "show" / "date" / ValidDate(date) =>
-      DBService.getDateFileNames(date).flatMap(fileNames =>
+      DBService.of.flatMap(_.getDateFileNames(date).flatMap(fileNames =>
         Ok(fileNames.asJson.pretty)
-      )
+      ))
 
     // http://0.0.0.0:8080/api/show/file/20230423_12:30.csv
     case GET -> Root / "show" / "file" / (fileName: String) =>
-      DBService.getFileContent(fileName).flatMap(Ok(_))
+      DBService.of.flatMap(_.getFileContent(fileName).flatMap(Ok(_)))
 
     // http://0.0.0.0:8080/api/help
     case GET -> Root / "help" => {