Report commit lead time

plugins/src/main/java/com/jraska/github/client/release/GitHubApi.kt

@@ -14,4 +14,6 @@ interface GitHubApi {
   fun listPrsWithoutMilestone(): List<PullRequest>
 
   fun createRelease(version: String)
+
+  fun prCommits(prNumber: Int): List<Commit>
 }

plugins/src/main/java/com/jraska/github/client/release/Release.kt

@@ -1,13 +1,23 @@
 package com.jraska.github.client.release
 
 import okhttp3.HttpUrl
+import java.time.Instant
 
 class Release(
   val releaseName: String,
-  val releaseUrl: HttpUrl
+  val releaseUrl: HttpUrl,
+  val timestamp: Instant
 )
 
 class PullRequest(
   val number: Int,
   val title: String
 )
+
+class Commit(
+  val sha: String,
+  val time: Instant,
+  val author: String,
+  val message: String,
+  val prNumber: Int
+)

plugins/src/main/java/com/jraska/github/client/release/ReleaseMarker.kt

@@ -1,8 +1,11 @@
 package com.jraska.github.client.release
 
+import com.jraska.github.client.release.data.LeadTimeReporter
+
 class ReleaseMarker(
   private val gitHubApi: GitHubApi,
-  private val notesComposer: NotesComposer
+  private val notesComposer: NotesComposer,
+  private val leadTimeReporter: LeadTimeReporter
 ) {
   fun markPrsWithMilestone(release: Release) {
     val pullRequests = gitHubApi.listPrsWithoutMilestone()
@@ -19,5 +22,7 @@ class ReleaseMarker(
     val releaseNotes = notesComposer.releaseNotes(pullRequests)
     gitHubApi.setMilestoneBody(milestoneNumber, releaseNotes)
     gitHubApi.setReleaseBody(release.releaseName, releaseNotes)
+
+    leadTimeReporter.reportLeadTime(pullRequests)
   }
 }

plugins/src/main/java/com/jraska/github/client/release/ReleaseMarksPRs.kt

@@ -1,15 +1,20 @@
 package com.jraska.github.client.release
 
+import com.jraska.analytics.AnalyticsReporter
 import com.jraska.github.client.release.data.GitHubApiFactory
+import com.jraska.github.client.release.data.LeadTimeReporter
 import okhttp3.HttpUrl.Companion.toHttpUrl
+import java.time.Instant
 
 object ReleaseMarksPRs {
   fun execute(tag: String) {
     val environment = Environment.create()
-    val release = Release(tag, "https://github.com/jraska/github-client/releases/tag/$tag".toHttpUrl())
+    val release = Release(tag, "https://github.com/jraska/github-client/releases/tag/$tag".toHttpUrl(), Instant.now())
 
     val api = GitHubApiFactory.create(environment)
-    val releaseMarker = ReleaseMarker(api, NotesComposer())
+
+    val leadTimeReporter = LeadTimeReporter(api, release, AnalyticsReporter.create("Lead Time Metrics"))
+    val releaseMarker = ReleaseMarker(api, NotesComposer(), leadTimeReporter)
 
     releaseMarker.markPrsWithMilestone(release)
   }

plugins/src/main/java/com/jraska/github/client/release/data/GitHubApiImpl.kt

@@ -1,7 +1,9 @@
 package com.jraska.github.client.release.data
 
+import com.jraska.github.client.release.Commit
 import com.jraska.github.client.release.GitHubApi
 import com.jraska.github.client.release.PullRequest
+import java.time.Instant
 
 class GitHubApiImpl(
   private val api: RetrofitGitHubApi
@@ -51,4 +53,16 @@ class GitHubApiImpl(
   override fun createRelease(version: String) {
     api.createRelease(CreateReleaseDto(version)).execute()
   }
+
+  override fun prCommits(prNumber: Int): List<Commit> {
+    return api.commits(prNumber).execute().body()!!.map {
+      Commit(
+        it.sha,
+        Instant.parse(it.commit.author.dateString),
+        it.author.login,
+        it.commit.message,
+        prNumber
+      )
+    }
+  }
 }

plugins/src/main/java/com/jraska/github/client/release/data/LeadTimeReporter.kt

@@ -0,0 +1,36 @@
+package com.jraska.github.client.release.data
+
+import com.jraska.analytics.AnalyticsEvent
+import com.jraska.analytics.AnalyticsReporter
+import com.jraska.github.client.release.Commit
+import com.jraska.github.client.release.GitHubApi
+import com.jraska.github.client.release.PullRequest
+import com.jraska.github.client.release.Release
+import java.time.Duration
+
+class LeadTimeReporter(
+  private val api: GitHubApi,
+  private val release: Release,
+  private val reporter: AnalyticsReporter
+) {
+  fun reportLeadTime(pulls: List<PullRequest>) {
+    val events = pulls.flatMap { api.prCommits(it.number) }
+      .map { toEvent(it) }
+
+    reporter.report(*events.toTypedArray())
+  }
+
+  private fun toEvent(commit: Commit): AnalyticsEvent {
+    return AnalyticsEvent(
+      "Commit Released",
+      mapOf(
+        "leadTimeSec" to Duration.between(commit.time, release.timestamp).seconds,
+        "gitCommit" to commit.sha,
+        "author" to commit.author,
+        "prNumber" to commit.prNumber,
+        "releaseName" to release.releaseName,
+        "message" to commit.message
+      )
+    )
+  }
+}

plugins/src/main/java/com/jraska/github/client/release/data/RetrofitGitHubApi.kt

@@ -34,6 +34,9 @@ interface RetrofitGitHubApi {
 
   @POST("releases")
   fun createRelease(@Body dto: CreateReleaseDto): Call<ResponseBody>
+
+  @GET("pulls/{pr_number}/commits")
+  fun commits(@Path("pr_number") prNumber: Int): Call<List<CommitItemDto>>
 }
 
 class PullRequestDto {
@@ -92,3 +95,32 @@ class CreateMilestoneResponseDto {
 }
 
 class CommentRequestDto(val body: String)
+
+class CommitItemDto {
+  @SerializedName("sha")
+  lateinit var sha: String
+
+  @SerializedName("commit")
+  lateinit var commit: CommitDto
+
+  @SerializedName("author")
+  lateinit var author: UserDto
+}
+
+class CommitDto {
+  @SerializedName("author")
+  lateinit var author: AuthorDto
+
+  @SerializedName("message")
+  lateinit var message: String
+}
+
+class AuthorDto {
+  @SerializedName("date")
+  lateinit var dateString: String
+}
+
+class UserDto {
+  @SerializedName("login")
+  lateinit var login: String
+}

plugins/src/test/kotlin/com/jraska/github/client/release/GitHubApiImplTest.kt

@@ -4,20 +4,28 @@ import com.jraska.github.client.release.data.GitHubApiFactory
 import okhttp3.mockwebserver.MockResponse
 import okhttp3.mockwebserver.MockWebServer
 import org.assertj.core.api.Assertions.assertThat
+import org.junit.Before
 import org.junit.Rule
 import org.junit.Test
+import java.io.File
+import java.time.Instant
 
 class GitHubApiImplTest {
 
+  private lateinit var gitHubApi: GitHubApi
+
   @get:Rule
   val mockWebServer = MockWebServer()
 
-  @Test
-  fun testPrMarkedProperly() {
+  @Before
+  fun setUp() {
     val environment = Environment("fakeToken", mockWebServer.url("/"))
-    val gitHubApi = GitHubApiFactory.create(environment)
+    gitHubApi = GitHubApiFactory.create(environment)
+  }
 
-    mockWebServer.enqueue(MockResponse().setResponseCode(200).setBody("{\"url\":\"https://api.github.com/repos/jraska/github-client/releases/40105170\",\"assets_url\":\"https://api.github.com/repos/jraska/github-client/releases/40105170/assets\",\"upload_url\":\"https://uploads.github.com/repos/jraska/github-client/releases/40105170/assets{?name,label}\",\"html_url\":\"https://github.com/jraska/github-client/releases/tag/0.23.0\",\"id\":40105170,\"author\":{\"login\":\"jraska\",\"id\":6277721,\"node_id\":\"MDQ6VXNlcjYyNzc3MjE=\",\"avatar_url\":\"https://avatars.githubusercontent.com/u/6277721?v=4\",\"gravatar_id\":\"\",\"url\":\"https://api.github.com/users/jraska\",\"html_url\":\"https://github.com/jraska\",\"followers_url\":\"https://api.github.com/users/jraska/followers\",\"following_url\":\"https://api.github.com/users/jraska/following{/other_user}\",\"gists_url\":\"https://api.github.com/users/jraska/gists{/gist_id}\",\"starred_url\":\"https://api.github.com/users/jraska/starred{/owner}{/repo}\",\"subscriptions_url\":\"https://api.github.com/users/jraska/subscriptions\",\"organizations_url\":\"https://api.github.com/users/jraska/orgs\",\"repos_url\":\"https://api.github.com/users/jraska/repos\",\"events_url\":\"https://api.github.com/users/jraska/events{/privacy}\",\"received_events_url\":\"https://api.github.com/users/jraska/received_events\",\"type\":\"User\",\"site_admin\":false},\"node_id\":\"MDc6UmVsZWFzZTQwMTA1MTcw\",\"tag_name\":\"0.23.0\",\"target_commitish\":\"master\",\"name\":\"0.23.0\",\"draft\":false,\"prerelease\":false,\"created_at\":\"2021-03-20T16:30:43Z\",\"published_at\":\"2021-03-20T16:31:04Z\",\"assets\":[],\"tarball_url\":\"https://api.github.com/repos/jraska/github-client/tarball/0.23.0\",\"zipball_url\":\"https://api.github.com/repos/jraska/github-client/zipball/0.23.0\",\"body\":\"Hey hey\"}\n"))
+  @Test
+  fun testPrMarkedProperly() {
+    mockWebServer.enqueue("response/release.json")
     mockWebServer.enqueue(MockResponse().setResponseCode(200))
 
     gitHubApi.setReleaseBody("0.23.0", "Hey hallo")
@@ -28,4 +36,29 @@ class GitHubApiImplTest {
     assertThat(secondRequest.requestUrl!!.encodedPath.endsWith("releases/40105170"))
     assertThat(secondRequest.body.toString()).contains("{\"body\":\"Hey hallo\"}")
   }
+
+  @Test
+  fun testGetsCommits() {
+    mockWebServer.enqueue("response/commits_pr472.json")
+
+    val prCommits = gitHubApi.prCommits(472)
+
+    assertThat(mockWebServer.takeRequest().requestUrl!!.encodedPath).endsWith("/pulls/472/commits")
+
+    val expectedCommit = Commit(
+      "65910afb3de84bb52283fbc8cb0c4be0988d4343", Instant.parse("2021-04-09T22:37:33Z"),
+      "jraska", "Delete test which isn't needed anymore",472
+    )
+    assertThat(prCommits[1]).usingRecursiveComparison().isEqualTo(expectedCommit)
+  }
+}
+
+fun MockWebServer.enqueue(path: String) {
+  enqueue(MockResponse().setResponseCode(200).setBody(json(path)))
+}
+
+fun json(path: String): String {
+  val uri = GitHubApiImplTest::class.java.classLoader.getResource(path)
+  val file = File(uri?.path!!)
+  return String(file.readBytes())
 }

plugins/src/test/kotlin/com/jraska/github/client/release/data/LeadTimeReporterTest.kt

@@ -0,0 +1,76 @@
+package com.jraska.github.client.release.data
+
+import com.jraska.analytics.AnalyticsEvent
+import com.jraska.analytics.AnalyticsReporter
+import com.jraska.github.client.release.Environment
+import com.jraska.github.client.release.PullRequest
+import com.jraska.github.client.release.Release
+import com.jraska.github.client.release.enqueue
+import okhttp3.HttpUrl.Companion.toHttpUrl
+import okhttp3.mockwebserver.MockWebServer
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import java.time.Instant
+
+class LeadTimeReporterTest {
+  private lateinit var leadTimeReporter: LeadTimeReporter
+  lateinit var analyticsReporter: RecordingAnalyticsReporter
+
+  @get:Rule
+  val mockWebServer = MockWebServer()
+
+  @Before
+  fun setUp() {
+    analyticsReporter = RecordingAnalyticsReporter()
+    val environment = Environment("fakeToken", mockWebServer.url("/"))
+    val gitHubApi = GitHubApiFactory.create(environment)
+
+    val release = Release("testRelease", "https://jrasks.com".toHttpUrl(), Instant.parse("2021-04-10T12:00:00Z"))
+    leadTimeReporter = LeadTimeReporter(gitHubApi, release, analyticsReporter)
+  }
+
+  @Test
+  fun testReportsLeadTimeProperly() {
+    mockWebServer.enqueue("response/commits_pr472.json")
+    mockWebServer.enqueue("response/commits_pr460.json")
+
+    leadTimeReporter.reportLeadTime(listOf(PullRequest(472, "First PR"), PullRequest(460, "Second PR")))
+
+    assertThat(mockWebServer.requestCount).isEqualTo(2)
+
+    val reportedEvents = analyticsReporter.events()
+    assertThat(reportedEvents).hasSize(3)
+
+    assertThat(reportedEvents).allMatch { it.name == "Commit Released" }
+    assertThat(reportedEvents).allMatch { it.properties["releaseName"] == "testRelease" }
+
+    val first = reportedEvents.first()
+    assertThat(first.properties["leadTimeSec"]).isEqualTo(13 * 3600 + 24 * 60 + 53L)
+    assertThat(first.properties["author"]).isEqualTo("jraska")
+    assertThat(first.properties["gitCommit"]).isEqualTo("859ffe735dc185336cbcad09e692d45dcf8c3361")
+    assertThat(first.properties["message"]).isEqualTo("un composite build tests on CI")
+
+    val second = reportedEvents[1]
+    assertThat(second.properties["leadTimeSec"]).isEqualTo(13 * 3600 + 22 * 60 + 27L)
+    assertThat(second.properties["author"]).isEqualTo("jraska")
+    assertThat(second.properties["gitCommit"]).isEqualTo("65910afb3de84bb52283fbc8cb0c4be0988d4343")
+    assertThat(second.properties["message"]).isEqualTo("Delete test which isn't needed anymore")
+
+    val third = reportedEvents[2]
+    assertThat(third.properties["leadTimeSec"]).isEqualTo(11 * 24 * 3600 + 23 * 3600 + 24 * 60 + 0L)
+    assertThat(third.properties["author"]).isEqualTo("dependabot[bot]")
+    assertThat(third.properties["gitCommit"]).isEqualTo("70e59ee5f812506651b10effbb00657d8e7ca4b2")
+  }
+}
+
+class RecordingAnalyticsReporter : AnalyticsReporter {
+  private val recorder: MutableList<AnalyticsEvent> = mutableListOf()
+
+  fun events(): List<AnalyticsEvent> = recorder
+
+  override fun report(vararg events: AnalyticsEvent) {
+    recorder.addAll(events)
+  }
+}