Add JSON output type for build reports

#KT-65792 Fixed

compiler/build-tools/kotlin-build-statistics/src/org/jetbrains/kotlin/build/report/metrics/BuildAttributes.kt

@@ -8,11 +8,9 @@ package org.jetbrains.kotlin.build.report.metrics
 import java.io.Serializable
 import java.util.*
 
-class BuildAttributes : Serializable {
-    private val myAttributes =
-        EnumMap<BuildAttribute, Int>(
-            BuildAttribute::class.java
-        )
+data class BuildAttributes(
+    private val myAttributes: MutableMap<BuildAttribute, Int> = EnumMap(BuildAttribute::class.java)
+) : Serializable {
 
     fun add(attr: BuildAttribute, count: Int = 1) {
         myAttributes[attr] = myAttributes.getOrDefault(attr, 0) + count

compiler/build-tools/kotlin-build-statistics/src/org/jetbrains/kotlin/build/report/statistics/BuildReportService.kt

@@ -0,0 +1,13 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.build.report.statistics
+
+import org.jetbrains.kotlin.buildtools.api.KotlinLogger
+import java.io.Serializable
+
+interface BuildReportService<T> : Serializable {
+    fun process(data: T, log: KotlinLogger)
+}

compiler/build-tools/kotlin-build-statistics/src/org/jetbrains/kotlin/build/report/statistics/CompileStatisticsData.kt

@@ -10,7 +10,7 @@ import java.text.SimpleDateFormat
 import java.util.*
 
 //Sensitive data. This object is used directly for statistic via http
-private val formatter = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss").also { it.timeZone = TimeZone.getTimeZone("UTC") }
+internal val formatter = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss").also { it.timeZone = TimeZone.getTimeZone("UTC") }
 
 interface CompileStatisticsData<B : BuildTime, P : BuildPerformanceMetric> {
     fun getVersion(): Int = 4

compiler/build-tools/kotlin-build-statistics/src/org/jetbrains/kotlin/build/report/statistics/FileReportService.kt

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.build.report.statistics
+
+import org.jetbrains.kotlin.buildtools.api.KotlinLogger
+import java.io.File
+import java.text.SimpleDateFormat
+import java.util.*
+
+abstract class FileReportService<T>(
+    buildReportDir: File,
+    projectName: String,
+    fileSuffix: String,
+) : BuildReportService<T> {
+    companion object {
+        internal val formatter = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss").also { it.timeZone = TimeZone.getTimeZone("UTC") }
+    }
+
+    private val ts = SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(Calendar.getInstance().time)
+    private val outputFile = buildReportDir.resolve("$projectName-build-$ts.$fileSuffix")
+
+    abstract fun printBuildReport(data: T, outputFile: File)
+
+    override fun process(data: T, log: KotlinLogger) {
+        val buildReportPath = outputFile.toPath().toUri().toString()
+        try {
+            outputFile.parentFile.mkdirs()
+            if (!(outputFile.parentFile.exists() && outputFile.parentFile.isDirectory)) {
+                log.error("Kotlin build report cannot be created: '${outputFile.parentFile}' is a file or do not have permissions to create")
+                return
+            }
+            printBuildReport(data, outputFile)
+
+            log.lifecycle("Kotlin build report is written to $buildReportPath")
+        } catch (e: Exception) {
+            log.error("Could not write Kotlin build report to $buildReportPath", e)
+        }
+    }
+}

compiler/build-tools/kotlin-build-statistics/src/org/jetbrains/kotlin/build/report/statistics/JsonReportService.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.build.report.statistics
+
+import com.google.gson.Gson
+import java.io.File
+
+class JsonReportService(
+    buildReportDir: File,
+    projectName: String,
+) : FileReportService<Any>(buildReportDir, projectName, "json") {
+
+    /**
+     * Prints general build information and task/transform build metrics
+     */
+    override fun printBuildReport(data: Any, outputFile: File) {
+        outputFile.bufferedWriter().use {
+            it.write(Gson().toJson(data))
+        }
+    }
+}