Refactor to FileService and PostgresService

src/main/scala/app/Main.scala

@@ -2,15 +2,15 @@ package app
 
 import cats.effect._
 import cats.implicits.catsSyntaxTuple2Parallel
-import db.{DBService, DataService}
+import db.{FileService, DataService}
 import fetch.{FetchService, FileFetchScheduler}
 import server.Server
 
 object Main extends IOApp {
   def run(args: List[String]): IO[ExitCode] = {
     for {
-      dbService <- DBService.of
-      dataService <- DataService.of(dbService)
+      fileService <- FileService.of
+      dataService <- DataService.of(fileService)
 
       fetch <- FetchService.of
       fileFetchScheduler <- FileFetchScheduler.of(dataService, fetch)

src/main/scala/db/DataService.scala

@@ -17,20 +17,20 @@ trait DataServiceTrait {
 }
 
 object DataService {
-  def of(dbService: DBService): IO[DataService] = {
+  def of(fileService: FileService): IO[DataService] = {
     for {
       log <- Slf4jLogger.create[IO]
       fileNameService = new FileNameService()
       fileNames <- fileNameService.generateLast24Hours
-      contents <- fileNames.traverse(fileName => dbService.readFile(fileName)
+      contents <- fileNames.traverse(fileName => fileService.readFile(fileName)
         .map(content => (fileName, content)))
       state = contents.toMap
       stateRef <- Ref.of[IO, Map[String, List[String]]](state)
-    } yield new DataService(dbService, new FileNameService(), log, stateRef)
+    } yield new DataService(fileService, new FileNameService(), log, stateRef)
   }
 }
 class DataService private(
-                           dbService: DBService,
+                           fileService: FileService,
                            fileNameService: FileNameService,
                            log: Logger[IO],
                            private val state: Ref[IO, Map[String, List[String]]]
@@ -47,7 +47,7 @@ class DataService private(
   }
 
   def save(fileName: String, content: String): IO[String] = {
-    dbService.save(fileName, content).redeemWith(
+    fileService.save(fileName, content).redeemWith(
       error => IO.raiseError(error),
       savedFileName => {
         state.update(st => st.updated(savedFileName, content.split("\n").toList)) *>
@@ -57,15 +57,15 @@ class DataService private(
     ).onError(error => log.info(s"errr... $error"))
   }
 
-  def readFile(fileName: String): IO[List[String]] = dbService.readFile(fileName)
+  def readFile(fileName: String): IO[List[String]] = fileService.readFile(fileName)
 
-  def getInRange(from: LocalDateTime, to: LocalDateTime): IO[List[String]] = dbService.getInRange(from, to)
+  def getInRange(from: LocalDateTime, to: LocalDateTime): IO[List[String]] = fileService.getInRange(from, to)
 
-  def getDates: IO[List[LocalDate]] = dbService.getDates
+  def getDates: IO[List[LocalDate]] = fileService.getDates
 
-  def getDatesByMonths(monthList: List[LocalDate]): IO[List[LocalDate]] = dbService.getDatesByMonths(monthList)
+  def getDatesByMonths(monthList: List[LocalDate]): IO[List[LocalDate]] = fileService.getDatesByMonths(monthList)
 
-  def getDateFileNames(date: LocalDate): IO[List[String]] = dbService.getDateFileNames(date)
+  def getDateFileNames(date: LocalDate): IO[List[String]] = fileService.getDateFileNames(date)
 
   // TODO implement getting full data from state
   def getLast24Hours: IO[List[String]] = {

src/main/scala/db/FileService.scala

@@ -14,13 +14,13 @@ import scala.concurrent.ExecutionContext
 import scala.io.Source
 import scala.util.Try
 
-object DBService {
-  def of: IO[DBService] = {
-    Slf4jLogger.create[IO].map(logger => new DBService(logger))
+object FileService {
+  def of: IO[FileService] = {
+    Slf4jLogger.create[IO].map(logger => new FileService(logger))
   }
 }
 
-class DBService(log: Logger[IO]) extends DataServiceTrait {
+class FileService(log: Logger[IO]) extends DataServiceTrait {
   private val dateFormatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmm")
   private val dataPath = "./data"
   private val nonDuplicatedLines = 34 // takes only first 34 lines of data as rest after 'Zosēni' is duplicated

src/main/scala/db/Main.scala

@@ -0,0 +1,32 @@
+package db
+
+import cats.effect._
+import cats.effect.unsafe.implicits.global
+import doobie._
+import doobie.implicits._
+import doobie.postgres.implicits._
+
+object Main {
+    def transactor[F[_]: Async]: Transactor[F] = Transactor.fromDriverManager[F](
+      "org.postgresql.Driver",
+      "jdbc:postgresql://localhost:5432/weather-tool",
+      "postgres",
+      "mysecretpassword"
+    )
+
+  def main(args: Array[String]): Unit = {
+    val xa = transactor[IO]
+    val result = for {
+      postgresService <- PostgresService.of(xa)
+      re <- postgresService.selectWeatherTable
+    } yield re
+
+
+//    val result = createWeatherTable(xa).unsafeRunSync()
+//    val result = insertInWeatherTable(xa).unsafeRunSync()
+//    val result = selectWeatherTable(xa).unsafeRunSync()
+//    val result = dropWeatherTable(xa).unsafeRunSync()
+
+    println(s"result: ${result.unsafeRunSync()}")
+  }
+}

src/main/scala/db/PostgresService.scala

@@ -2,24 +2,22 @@ package db
 
 import cats.data.NonEmptyList
 import cats.effect._
-import cats.effect.unsafe.implicits.global
 import doobie._
 import doobie.implicits._
 
 import java.time.format.DateTimeFormatter
 import java.time.{LocalDateTime, ZoneId, ZonedDateTime}
 import doobie.postgres.implicits._
+import org.typelevel.log4cats.Logger
+import org.typelevel.log4cats.slf4j.Slf4jLogger
 
-case class SqlContent(value: String)
-
-object Postgres {
-  def transactor[F[_]: Async]: Transactor[F] = Transactor.fromDriverManager[F](
-    "org.postgresql.Driver",
-    "jdbc:postgresql://localhost:5432/weather-tool",
-    "postgres",
-    "mysecretpassword"
-  )
+object PostgresService {
+  def of(transactor: Transactor[IO]): IO[PostgresService] = {
+    Slf4jLogger.create[IO].map(logger => new PostgresService(transactor, logger))
+  }
+}
 
+class PostgresService(transactor: Transactor[IO], log: Logger[IO]) {
   def getResourceContent(path: String): IO[String] = {
     val streamResource = Resource.make(IO(getClass.getResourceAsStream(path))) { stream =>
       IO(stream.close()).handleErrorWith(_ => IO.unit)
@@ -30,23 +28,16 @@ object Postgres {
     }
   }
 
-//  def findUserById(userId: Int)(implicit xa: Transactor[IO]): IO[Option[User]] = {
-//    sql"SELECT id, name FROM users WHERE id = $userId"
-//      .query[User]
-//      .option
-//      .transact(xa)
-//  }
-
-  def createWeatherTable(implicit xa: Transactor[IO]): IO[Int] = {
+  def createWeatherTable(): IO[Int] = {
     for {
       createTableSql <- getResourceContent("/db/create_weather_table.sql")
-      result <- Update0(createTableSql, None).run.transact(xa)
+      result <- Update0(createTableSql, None).run.transact(transactor)
     } yield result
   }
 
   implicit val doubleOptionMeta: Meta[Option[Double]] = Meta[Double].imap(Option(_))(_.getOrElse(Double.NaN))
 
-  def insertInWeatherTable(xa: Transactor[IO]): IO[Int] = {
+  def insertInWeatherTable(): IO[Int] = {
     val formatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmm")
     val dateTime = LocalDateTime.parse("20230516_1500", formatter)
 
@@ -59,11 +50,11 @@ object Postgres {
       insertTableSql <- getResourceContent("/db/insert_weather_table.sql")
       result <- Update[(ZonedDateTime, String, Option[Double], Option[Double], Option[Double], Option[Double], Option[Double], Option[Double], Option[Double], Option[Double], Option[Double], Option[Double], Option[Double], Option[Double], Option[Double], List[String])](
         insertTableSql
-      ).run((zonedTime, "Rīga", Some(20.2), Some(8.8), Some(15.6), None, None, None, None, None, None, None, None, None, None, List("hail", "rain"))).transact(xa)
+      ).run((zonedTime, "Rīga", Some(20.2), Some(8.8), Some(15.6), None, None, None, None, None, None, None, None, None, None, List("hail", "rain"))).transact(transactor)
     } yield result
   }
 
-  def selectWeatherTable(xa: Transactor[IO]): IO[List[(String, Option[Double])]] = {
+  def selectWeatherTable(): IO[List[(String, Option[Double])]] = {
     val formatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmm")
     val rigaZone = ZoneId.of("Europe/Riga")
     val from = LocalDateTime.parse("20230516_0100", formatter).atZone(rigaZone)
@@ -76,8 +67,7 @@ object Postgres {
       fr"""
         SELECT
           city,
-          MIN(""" ++ Fragment.const(columnName) ++
-        fr""") AS tempMin
+          MIN(""" ++ Fragment.const(columnName) ++ fr""") AS tempMin
         FROM weather
         WHERE
           """ ++ Fragments.in(fr"city", citiesNel) ++ fr"""
@@ -89,24 +79,13 @@ object Postgres {
     baseQuery
       .query[(String, Option[Double])]
       .to[List]
-      .transact(xa)
+      .transact(transactor)
   }
 
-  def dropWeatherTable(implicit xa: Transactor[IO]): IO[Int] = {
+  def dropWeatherTable(): IO[Int] = {
     for {
       dropTableSql <- getResourceContent("/db/drop_weather_table.sql")
-      result <- Update0(dropTableSql, None).run.transact(xa)
+      result <- Update0(dropTableSql, None).run.transact(transactor)
     } yield result
   }
-
-  def main(args: Array[String]): Unit = {
-    val xa = transactor[IO]
-
-//    val result = createWeatherTable(xa).unsafeRunSync()
-//    val result = insertInWeatherTable(xa).unsafeRunSync()
-    val result = selectWeatherTable(xa).unsafeRunSync()
-//    val result = dropWeatherTable(xa).unsafeRunSync()
-
-    println(s"result: $result")
-  }
 }

src/main/scala/parse/Main.scala

@@ -1,7 +1,7 @@
 package parse
 
 import cats.effect.unsafe.implicits.global
-import db.DBService
+import db.FileService
 import io.circe.syntax.EncoderOps
 import parse.Aggregate.{AggregateKey, UserQuery}
 
@@ -43,8 +43,8 @@ object Main {
     val from = LocalDateTime.parse("20230627_0000", formatter)
     val to = LocalDateTime.parse("20230627_2359", formatter)
 
-    val dbService = DBService.of.unsafeRunSync()
-    val lines = dbService.getInRange(from, to).unsafeRunSync()
+    val fileService = FileService.of.unsafeRunSync()
+    val lines = fileService.getInRange(from, to).unsafeRunSync()
     val query = UserQuery(List("Ainaži"), "tempAvg", AggregateKey.Avg, ChronoUnit.HOURS)
     val parsed = Parser.queryData(query, lines)
     println(parsed.asJson)

src/test/scala/db/FileServiceSpec.scala

@@ -9,12 +9,12 @@ import java.time.format.DateTimeFormatter
 import java.time.{LocalDate, LocalDateTime}
 
 
-class DBServiceSpec extends AnyFunSuite with Matchers {
+class FileServiceSpec extends AnyFunSuite with Matchers {
   private val dateFormatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmm")
 
   test("getDateFileNames should return correct file names") {
-    val dbService = DBService.of.unsafeRunSync()
-    val datesList = dbService.getDateFileNames(LocalDate.of(2023, 5, 15))
+    val fileService = FileService.of.unsafeRunSync()
+    val datesList = fileService.getDateFileNames(LocalDate.of(2023, 5, 15))
       .unsafeRunSync()
 
     val expectedFileNames = (0 to 23).toList
@@ -28,8 +28,8 @@ class DBServiceSpec extends AnyFunSuite with Matchers {
     val from = LocalDateTime.parse("20230513_2200", dateFormatter)
     val to = LocalDateTime.parse("20230516_1230", dateFormatter)
 
-    val dbService = DBService.of.unsafeRunSync()
-    val lines = dbService.getInRange(from, to).unsafeRunSync()
+    val fileService = FileService.of.unsafeRunSync()
+    val lines = fileService.getInRange(from, to).unsafeRunSync()
 
     lines.length shouldBe 2142
   }
@@ -41,8 +41,8 @@ class DBServiceSpec extends AnyFunSuite with Matchers {
       LocalDate.parse("20230501", monthFormatter),
       LocalDate.parse("20230601", monthFormatter),
     )
-    val dbService = DBService.of.unsafeRunSync()
-    val dates = dbService.getDatesByMonths(monthList).unsafeRunSync()
+    val fileService = FileService.of.unsafeRunSync()
+    val dates = fileService.getDatesByMonths(monthList).unsafeRunSync()
 
     dates should not be empty
 
@@ -56,19 +56,19 @@ class DBServiceSpec extends AnyFunSuite with Matchers {
   }
 
   test("DBService.save should return correct result") {
-    val dbService = DBService.of.unsafeRunSync()
+    val fileService = FileService.of.unsafeRunSync()
     val fileName = "testFile.txt"
     val fileContent = "test content..."
 
-    dbService.save(fileName, fileContent).unsafeRunSync() shouldEqual fileName
+    fileService.save(fileName, fileContent).unsafeRunSync() shouldEqual fileName
   }
 
   test("DBService.save returns error on invalid file name") {
-    val dbService = DBService.of.unsafeRunSync()
+    val fileService = FileService.of.unsafeRunSync()
     val fileName = "/invalid/file/name"
     val fileContent = "test content..."
 
-    val result = dbService.save(fileName, fileContent).attempt.unsafeRunSync()
+    val result = fileService.save(fileName, fileContent).attempt.unsafeRunSync()
 
     result match {
       case Left(e) =>

src/test/scala/fetch/FetchServiceSpec.scala

@@ -3,7 +3,7 @@ package fetch
 import cats.effect.IO
 import cats.effect.unsafe.implicits.global
 import cats.implicits.toTraverseOps
-import db.DBService
+import db.FileService
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 import org.typelevel.log4cats.slf4j.Slf4jLogger

src/test/scala/fetch/FileFetchSchedulerSpec.scala

@@ -4,7 +4,7 @@ import base.IOSuite
 import cats.effect.{Clock, IO}
 import cats.effect.kernel.Ref
 import cats.implicits.catsSyntaxTuple3Semigroupal
-import db.DBService
+import db.FileService
 import org.scalatest.matchers.should.Matchers
 import org.scalatest.wordspec.AsyncWordSpec
 import org.typelevel.log4cats.slf4j.Slf4jLogger
@@ -19,7 +19,7 @@ class FileFetchSchedulerSpec extends AsyncWordSpec with Matchers with IOSuite {
         refFetch <- Ref.of[IO, Option[(String, String)]](None)
         refScheduler <- Ref.of[IO, Option[Either[Throwable, (String, String)]]](None)
         log <- Slf4jLogger.create[IO]
-        dbService = new DBService(log) {
+        fileService = new FileService(log) {
           override def save(fileName: String, content: String): IO[String] = {
             refDb.set(Some(fileName)).as(fileName)
           }
@@ -40,7 +40,7 @@ class FileFetchSchedulerSpec extends AsyncWordSpec with Matchers with IOSuite {
           }
         }
 
-        res = new FileFetchScheduler(dbService, fetchService, fileNameService, scheduler, log)
+        res = new FileFetchScheduler(fileService, fetchService, fileNameService, scheduler, log)
           .run.compile.drain *>
           (refDb.get, refFetch.get, refScheduler.get).tupled.map { case (db, fetch, scheduler) =>
             db shouldBe Some("file_test")

src/test/scala/parse/ParserSpec.scala

@@ -1,7 +1,7 @@
 package parse
 
 import cats.effect.unsafe.implicits.global
-import db.DBService
+import db.FileService
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 import parse.Aggregate.{AggregateKey, DoubleValue, TimeDoubleList, UserQuery}
@@ -19,9 +19,9 @@ class ParserSpec extends AnyFunSuite with Matchers {
     val to = LocalDateTime.parse("20230516_0942", formatter)
     val userQuery = UserQuery(List("Bauska", "Dagda", "Daugavgrīva", "Rīga"), "precipitation", AggregateKey.Sum, ChronoUnit.HOURS)
 
-    val dbService = DBService.of.unsafeRunSync()
+    val fileService = FileService.of.unsafeRunSync()
 
-    val lines = dbService.getInRange(from, to).unsafeRunSync()
+    val lines = fileService.getInRange(from, to).unsafeRunSync()
     val parsed = Parser.queryData(userQuery, lines)
 
     parsed shouldBe HashMap(
@@ -38,9 +38,9 @@ class ParserSpec extends AnyFunSuite with Matchers {
     val to = LocalDateTime.parse("20230516_0800", formatter)
     val userQuery = UserQuery(List("Rīga"), "precipitation", AggregateKey.List, ChronoUnit.HOURS)
 
-    val dbService = DBService.of.unsafeRunSync()
+    val fileService = FileService.of.unsafeRunSync()
 
-    val lines = dbService.getInRange(from, to).unsafeRunSync()
+    val lines = fileService.getInRange(from, to).unsafeRunSync()
     val parsed = Parser.queryData(userQuery, lines)
 
     parsed shouldBe HashMap(