retry added

ce3/src/main/scala/_sandbox/Sandbox.scala

@@ -4,6 +4,10 @@ import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 import org.scalatestplus.scalacheck.ScalaCheckPropertyChecks
 
+import scala.concurrent.ExecutionContext.Implicits.global
+import scala.concurrent.duration.DurationInt
+import scala.concurrent.{Await, Future}
+
 object Sandbox {
 
   def id[A](a: A): A = a
@@ -15,6 +19,36 @@ class SandboxSpec extends AnyFunSuite with Matchers with ScalaCheckPropertyCheck
 
   import Sandbox._
 
+  test("123") {
+    case class Person(age: Int, name: String)
+    def getAge = Future(123)
+    def getName = Future("Jim")
+
+    val fp: Future[Person] =
+      getName.flatMap(n =>
+        getAge.map(a =>
+          Person(a, n)
+        )
+      )
+    val p: Person = Await.result(fp, 10.seconds)
+
+
+
+
+  }
+
+  test("11") {
+    pprint.log(math.acos(0.96))
+    pprint.log(math.sin(math.acos(0.96)))
+    pprint.log(math.acos(1))
+    pprint.log(math.sin(math.acos(1)))
+    pprint.log(math.acos(0.95))
+    pprint.log(math.sin(math.acos(0.95)))
+    pprint.log(math.acos(0.65))
+    pprint.log(math.sin(math.acos(0.65)))
+  }
+
+
   test("0") {
     def isScala212a(v: Option[(Long, Long)]): Boolean =
       v.exists(_._1 == 2) && v.exists(_._2 == 12)

ce3/src/main/scala/el_meter/Sandbox.scala

@@ -4,9 +4,12 @@ import cats.effect.IO
 import cats.effect.unsafe.implicits.global
 import cats.implicits._
 import io.scalaland.chimney.Transformer
+
 import java.time.Instant
 import java.time.LocalDateTime
 import java.time.ZoneOffset
+import java.time.format.DateTimeFormatter
+import javax.swing.text.DateFormatter
 import org.http4s.Method
 import org.http4s.Request
 import org.http4s.Status.BadRequest
@@ -19,6 +22,10 @@ import org.http4s.implicits.http4sLiteralsSyntax
 import org.scalatest.funsuite.AnyFunSuite
 import org.scalatest.matchers.should.Matchers
 import org.scalatestplus.scalacheck.ScalaCheckPropertyChecks
+import retry.{RetryDetails, RetryPolicy}
+import retry.implicits.retrySyntaxError
+import retryideas.RetryApp.x
+
 import scala.concurrent.duration.DurationInt
 
 object Http {
@@ -48,6 +55,25 @@ class SandboxSpec extends AnyFunSuite with Matchers with ScalaCheckPropertyCheck
   import model._
 //  import io.scalaland.chimney.dsl._
 
+  def leftPad(x: Int, width: Int): String = s"%${width}d".formatted(x)
+  def leftPad(x: Double, width: Int): String = leftPad(x.toInt, width)
+
+  test("leftPad") {
+    val x = leftPad(1.123, 6)
+    pprint.log(x)
+  }
+
+  test("date formatted") {
+    val ldt = LocalDateTime.parse("2024-08-25T13:52")
+    val rep = ldt.format(DateTimeFormatter.ISO_DATE_TIME)
+    pprint.log(rep)
+  }
+
+  test("pprint") {
+    pprint
+      .log("Hello")
+  }
+
   test("round") {
     pprint.log(round1(1.23456))
   }
@@ -72,9 +98,26 @@ class SandboxSpec extends AnyFunSuite with Matchers with ScalaCheckPropertyCheck
   }
 
   test("streamed") {
+
+    val policy: RetryPolicy[IO] = {
+      import retry.RetryPolicies._
+      // 6 retries starting from 1 gives us +1 +2 +4 +8 +16 +32 = 63 sec ~= 1 min
+      val growing: RetryPolicy[IO] = limitRetries[IO](5) join exponentialBackoff[IO](1.second)
+      // constant never terminating retry
+      val constant: RetryPolicy[IO] = constantDelay[IO](10.seconds)
+
+      growing followedBy constant
+    }
+
+    val onError = (t: Throwable, d: RetryDetails) =>
+      IO { println(LocalDateTime.now -> "device inaccessible retrying...") }
+
+    val getDataWithRetry = getData
+      .retryingOnAllErrors(policy, onError)
+
     fs2.Stream
       .awakeEvery[IO](5000.millis)
-      .evalMap(_ => getData)
+      .evalMap(_ => getDataWithRetry)
       .unNone
       .map(_.into[DataLine].transform)
       .map(_.into[DataLineWattOnlyDetailed].transform)