Adds ktor module with retry plugin usage example

gradle/libs.versions.toml

@@ -12,8 +12,11 @@ compose-compiler = "1.5.4"
 compose-material3 = "1.2.1"
 androidx-activityCompose = "1.8.2"
 kotlinx-serialization = "1.6.3"
-junit = "5.9.3"
+junit = "4.13.2"
+junit-jupiter = "5.9.3"
 resilience4j = "2.2.0"
+logback = "1.5.3"
+hamcrest = "2.2"
 
 [libraries]
 # kotlin
@@ -45,23 +48,33 @@ ktor-client-core = { module = "io.ktor:ktor-client-core", version.ref = "ktor" }
 ktor-client-js = { module = "io.ktor:ktor-client-js", version.ref = "ktor" }
 ktor-client-android = { module = "io.ktor:ktor-client-android", version.ref = "ktor" }
 ktor-client-websockets = { module = "io.ktor:ktor-client-websockets", version.ref = "ktor" }
+ktor-client-cio = { module = "io.ktor:ktor-client-cio", version.ref = "ktor" }
+ktor-client-logging = { module = "io.ktor:ktor-client-logging", version.ref = "ktor" }
 ktor-bom = { module = "io.ktor:ktor-bom", version.ref = "ktor" }
+ktor-server-core = { module = "io.ktor:ktor-server-core", version.ref = "ktor" }
 ktor-server-netty = { module = "io.ktor:ktor-server-netty", version.ref = "ktor" }
 ktor-server-websockets = { module = "io.ktor:ktor-server-websockets", version.ref = "ktor" }
+ktor-server-cio = { module = "io.ktor:ktor-server-cio", version.ref = "ktor" }
 ktor-server-calllogging = { module = "io.ktor:ktor-server-call-logging", version.ref = "ktor" }
 ktor-server-defaultheaders = { module = "io.ktor:ktor-server-default-headers", version.ref = "ktor" }
 ktor-server-sessions = { module = "io.ktor:ktor-server-sessions", version.ref = "ktor" }
 ktor-server-statuspages = { module = "io.ktor:ktor-server-status-pages", version.ref = "ktor" }
-ktor-server-test-host = { module = "io.ktor:ktor-server-test-host", version.ref = "ktor" }
+ktor-server-testhost = { module = "io.ktor:ktor-server-test-host", version.ref = "ktor" }
+ktor-server-hostcommon = { module = "io.ktor:ktor-server-host-common", version.ref = "ktor" }
 
 # Resilience4j
 resilience4j-retry = { module = "io.github.resilience4j:resilience4j-retry", version.ref = "resilience4j" }
 resilience4j-kotlin = { module = "io.github.resilience4j:resilience4j-kotlin", version.ref = "resilience4j" }
 
+# junit
+junit = { module = "junit:junit", version.ref = "junit" }
+junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit-jupiter" }
+
 # others
+logback-classic = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
 nexus-publish = { module = "io.github.gradle-nexus.publish-plugin:io.github.gradle-nexus.publish-plugin.gradle.plugin", version.ref = "nexus-publish" }
 mockito-core = { module = "org.mockito:mockito-core", version.ref = "mockito" }
-junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit" }
+hamcrest = { module = "org.hamcrest:hamcrest", version.ref = "hamcrest" }
 
 [plugins]
 androidLibrary = { id = "com.android.library", version.ref = "agp" }
@@ -71,4 +84,4 @@ kotlinMultiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref =
 kotlinAndroid = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlinxSerialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
 
-# original toml taken from: https://github.com/ktorio/ktor-documentation/blob/2.3.9/codeSnippets/snippets/tutorial-client-kmm/gradle/libs.versions.toml
+# original toml taken from: https://github.com/ktorio/ktor-documentation/blob/2.3.9/codeSnippets/snippets/tutorial-client-kmm/gradle/libs.versions.toml

ktor-retry-plugin/client-retry/README.md

@@ -0,0 +1,19 @@
+# Client Retry
+
+A sample Ktor project showing how to use the [HttpRequestRetry](https://ktor.io/docs/client-retry.html) plugin.
+> This sample is a part of the [codeSnippets](../../README.md) Gradle project.
+
+## Running
+
+This client sample uses the server from the [simulate-slow-server](../simulate-slow-server) example.
+The server sample has the `/error` route that returns the `200 OK` response from the third attempt only.
+
+To see `HttpRequestRetry` in action, run this example by executing the following command:
+
+```bash
+./gradlew :client-retry:run
+```
+
+The client will send three consequent requests automatically to get a success response from the server.
+
+> Note that this example uses the [Logging](https://ktor.io/docs/client-logging.html) plugin to show all requests in a console.

ktor-retry-plugin/client-retry/build.gradle.kts

@@ -0,0 +1,27 @@
+plugins {
+    application
+    alias(libs.plugins.kotlinJvm)
+}
+
+application {
+    mainClass.set("application.ApplicationKt")
+}
+
+repositories {
+    mavenCentral()
+    maven { url = uri("https://maven.pkg.jetbrains.space/public/p/ktor/eap") }
+}
+
+dependencies {
+    implementation(libs.ktor.client.core)
+    implementation(libs.ktor.client.cio)
+    implementation(libs.ktor.client.logging)
+    implementation(libs.ktor.server.core)
+    implementation(libs.ktor.server.cio)
+    implementation(libs.ktor.server.hostcommon)
+    implementation(libs.logback.classic)
+    implementation(project(":simulate-slow-server"))
+    implementation(project(":end-to-end-utilities"))
+    testImplementation(libs.junit)
+    testImplementation(libs.hamcrest)
+}

ktor-retry-plugin/client-retry/src/main/kotlin/application/Application.kt

@@ -0,0 +1,28 @@
+package application
+
+import e2e.*
+import io.ktor.client.*
+import io.ktor.client.engine.cio.*
+import io.ktor.client.plugins.*
+import io.ktor.client.plugins.logging.*
+import io.ktor.client.request.*
+import io.ktor.client.statement.*
+import io.ktor.server.application.*
+import kotlinx.coroutines.*
+import slowserver.main
+
+fun main() {
+    defaultServer(Application::main).start()
+    runBlocking {
+        val client = HttpClient(CIO) {
+            install(HttpRequestRetry) {
+                retryOnServerErrors(maxRetries = 5)
+                exponentialDelay()
+            }
+            install(Logging) { level = LogLevel.INFO }
+        }
+
+        val response: HttpResponse = client.get("http://0.0.0.0:8080/error")
+        println(response.bodyAsText())
+    }
+}

ktor-retry-plugin/client-retry/src/test/kotlin/application/ApplicationTest.kt

@@ -0,0 +1,44 @@
+package application
+
+import e2e.readString
+import e2e.runGradleAppWaiting
+import kotlinx.coroutines.runBlocking
+import org.junit.*
+import org.junit.Assert.*
+import java.io.File
+
+class ApplicationTest {
+
+    companion object {
+        private const val GRADLEW_WINDOWS = "gradlew.bat"
+        private const val GRADLEW_UNIX = "gradlew"
+
+        @JvmStatic
+        fun findGradleWrapper(): String {
+            val currentDir = File(System.getProperty("user.dir"))
+            val parentDir = currentDir.parent ?: error("Cannot find parent directory of $currentDir")
+            val gradlewName = if (System.getProperty("os.name").startsWith("Windows")) {
+                GRADLEW_WINDOWS
+            } else {
+                GRADLEW_UNIX
+            }
+            val gradlewFile = File(parentDir, gradlewName)
+            check(gradlewFile.exists())  { "Gradle Wrapper not found at ${gradlewFile.absolutePath}" }
+            return gradlewFile.absolutePath
+        }
+    }
+
+    @Before
+    fun setup() {
+        System.setProperty("gradlew", findGradleWrapper())
+    }
+
+    @Test
+    fun outputContainsAllResponses() = runBlocking {
+        runGradleAppWaiting().inputStream.readString().let { outputString ->
+            assertTrue(outputString.contains("RESPONSE: 500 Internal Server Error"))
+            assertTrue(outputString.contains("RESPONSE: 200 OK"))
+            assertTrue(outputString.contains("Server is back online!"))
+        }
+    }
+}

ktor-retry-plugin/end-to-end-utilities/README.md

@@ -0,0 +1,3 @@
+# End-to-end utilities
+
+This project isn't runnable and contains helper classes and functions for testing samples from this repository.

ktor-retry-plugin/end-to-end-utilities/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    alias(libs.plugins.kotlinJvm)
+}
+
+repositories {
+    mavenCentral()
+    maven { url = uri("https://maven.pkg.jetbrains.space/public/p/ktor/eap") }
+}
+
+dependencies {
+    implementation(libs.ktor.server.core)
+    implementation(libs.ktor.server.cio)
+}

ktor-retry-plugin/end-to-end-utilities/src/main/kotlin/e2e/defaultServer.kt

@@ -0,0 +1,16 @@
+package e2e
+
+import io.ktor.server.application.*
+import io.ktor.server.cio.*
+import io.ktor.server.engine.*
+import org.slf4j.helpers.NOPLogger
+
+fun defaultServer(module: Application.() -> Unit) = embeddedServer(CIO, environment = applicationEngineEnvironment {
+    log = NOPLogger.NOP_LOGGER
+
+    connector {
+        port = 8080
+    }
+
+    module(module)
+})

ktor-retry-plugin/end-to-end-utilities/src/main/kotlin/e2e/gradleProcess.kt

@@ -0,0 +1,21 @@
+package e2e
+
+import java.io.InputStream
+
+fun runGradleAppWaiting(): Process = runGradleWaiting("run")
+fun runGradleApp(): Process = runGradle("run")
+
+fun runGradleWaiting(vararg args: String): Process {
+    val process = runGradle(*args)
+    process.waitFor()
+    return process
+}
+
+fun runGradle(vararg args: String): Process {
+    val gradlewPath =
+        System.getProperty("gradlew") ?: error("System property 'gradlew' should point to Gradle Wrapper file")
+    val processArgs = listOf(gradlewPath, "-Dorg.gradle.logging.level=quiet", "--quiet") + args
+    return ProcessBuilder(processArgs).start()
+}
+
+fun InputStream.readString(): String = readAllBytes().toString(Charsets.UTF_8)

ktor-retry-plugin/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

ktor-retry-plugin/gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

ktor-retry-plugin/gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

ktor-retry-plugin/settings.gradle.kts

@@ -0,0 +1,28 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    dependencyResolutionManagement {
+        versionCatalogs {
+            create("libs") {
+                from(files("../gradle/libs.versions.toml"))
+            }
+        }
+    }
+    @Suppress("UnstableApiUsage")
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "ktor-retry-plugin"
+
+include(":client-retry")
+include(":simulate-slow-server")
+include(":end-to-end-utilities")

ktor-retry-plugin/simulate-slow-server/README.md

@@ -0,0 +1,12 @@
+# Slow Server
+
+An application simulating a slow server by creating a custom interceptor for Ktor.
+> This sample is a part of the [codeSnippets](../../README.md) Gradle project.
+
+## Running
+
+Execute this command in the repository's root directory to run this sample:
+
+```bash
+./gradlew :simulate-slow-server:run
+```

ktor-retry-plugin/simulate-slow-server/build.gradle.kts

@@ -0,0 +1,22 @@
+plugins {
+    application
+    alias(libs.plugins.kotlinJvm)
+}
+
+application {
+    mainClass.set("io.ktor.server.netty.EngineMain")
+}
+
+repositories {
+    mavenCentral()
+    maven { url = uri("https://maven.pkg.jetbrains.space/public/p/ktor/eap") }
+}
+
+dependencies {
+    implementation(libs.kotlin.stdlib.jdk8)
+    implementation(libs.ktor.server.netty)
+    implementation(libs.ktor.server.core)
+    implementation(libs.logback.classic)
+    testImplementation(libs.ktor.server.testhost)
+    testImplementation(libs.kotlin.test)
+}

ktor-retry-plugin/simulate-slow-server/src/main/kotlin/slowserver/Application.kt

@@ -0,0 +1,30 @@
+package slowserver
+
+import io.ktor.http.*
+import io.ktor.server.application.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import kotlinx.coroutines.*
+import java.time.*
+
+fun Application.main() {
+    intercept(ApplicationCallPipeline.Plugins) {
+        delay(2000L)
+    }
+    routing {
+        get("/path1") {
+            call.respondText("Response time: ${LocalTime.now()}")
+        }
+        get("/path2") {
+            call.respondText("Response time: ${LocalTime.now()}")
+        }
+        var requestCount = 0
+        get("/error") {
+            requestCount += 1
+            when (requestCount) {
+                in 1..2 -> call.respondText("Server is down", status = HttpStatusCode.InternalServerError)
+                in 3..10 -> call.respondText("Server is back online!", status = HttpStatusCode.OK)
+            }
+        }
+    }
+}

ktor-retry-plugin/simulate-slow-server/src/main/resources/application.conf

@@ -0,0 +1,9 @@
+ktor {
+    deployment {
+        port = 8080
+    }
+
+    application {
+        modules = [ slowserver.ApplicationKt.main ]
+    }
+}

ktor-retry-plugin/simulate-slow-server/src/main/resources/logback.xml

@@ -0,0 +1,12 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{YYYY-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+    <root level="trace">
+        <appender-ref ref="STDOUT"/>
+    </root>
+    <logger name="org.eclipse.jetty" level="INFO"/>
+    <logger name="io.netty" level="INFO"/>
+</configuration>

ktor-retry-plugin/simulate-slow-server/src/test/kotlin/slowserver/ApplicationTest.kt

@@ -0,0 +1,19 @@
+package slowserver
+
+import io.ktor.client.request.*
+import io.ktor.server.testing.*
+import java.time.Duration
+import java.time.LocalTime
+import kotlin.test.*
+
+class ApplicationTest {
+    @Test
+    fun testPath1() = testApplication {
+        val requestTime = LocalTime.now()
+        client.get("/path1")
+        val responseTime = LocalTime.now()
+        assertTrue {
+            Duration.between(requestTime, responseTime).toSeconds() >= 2
+        }
+    }
+}

ktor/lib/build.gradle.kts

@@ -63,7 +63,7 @@ kotlin {
         val backendJvmTest by getting {
             dependsOn(commonTest)
             dependencies {
-                implementation(libs.ktor.server.test.host)
+                implementation(libs.ktor.server.testhost)
                 implementation(libs.ktor.client.websockets)
             }
         }

resilience4j/build.gradle.kts

@@ -5,7 +5,6 @@ plugins {
 repositories {
     // Use Maven Central for resolving dependencies.
     mavenCentral()
-
 }
 
 dependencies {
@@ -19,4 +18,4 @@ dependencies {
 
 tasks.named<Test>("test") {
     useJUnitPlatform()
-}
+}