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package dotty.tools.bot
import org.http4s._
import org.http4s.client.blaze._
import org.http4s.client.Client
import scalaz.concurrent.Task
import io.circe._
import io.circe.generic.auto._
import io.circe.syntax._
import org.http4s.circe._
import org.http4s.dsl._
import github4s.Github
import github4s.jvm.Implicits._
import github4s.free.domain.{ Commit, Issue }
trait PullRequestService {
val prService = HttpService {
case request @ POST -> Root =>
request.as(jsonOf[Issue]).flatMap(checkPullRequest)
}
private case class CLASignature(
user: String,
signed: Boolean,
version: String,
currentVersion: String
)
private case class Status(
state: String,
target_url: String,
description: String,
context: String = "continuous-integration/CLA"
)
def claUrl(userName: String): String =
s"https://www.lightbend.com/contribute/cla/scala/check/$userName"
def commitsUrl(prNumber: Int): String =
s"https://api.github.com/repos/lampepfl/dotty/pulls/$prNumber/commits"
def toUri(url: String): Task[Uri] =
Uri.fromString(url).fold(Task.fail, Task.now)
def getRequest(endpoint: Uri): Task[Request] = Task.now {
Request(uri = endpoint, method = Method.GET)
}
def postRequest(endpoint: Uri): Task[Request] = Task.now {
Request(uri = endpoint, method = Method.POST)
}
def shutdownClient(client: Client): Task[Unit] = Task.now {
client.shutdownNow()
}
def users(xs: List[Commit]): Task[Set[String]] = Task.now {
xs.map(_.login).flatten.toSet
}
sealed trait CommitStatus {
def commit: Commit
def isValid: Boolean
}
final case class Valid(commit: Commit) extends CommitStatus { def isValid = true }
final case class Invalid(commit: Commit) extends CommitStatus { def isValid = false }
/** Partitions invalid and valid commits */
def checkCLA(xs: List[Commit], httpClient: Client): Task[List[CommitStatus]] = {
def checkUser(commit: Commit): Task[CommitStatus] = for {
endpoint <- toUri(claUrl(commit.login.get))
claReq <- getRequest(endpoint)
claRes <- httpClient.expect(claReq)(jsonOf[CLASignature])
res = if (claRes.signed) Valid(commit) else Invalid(commit)
} yield res
Task.gatherUnordered(xs.filter(_.login.isDefined).map(checkUser))
}
def sendStatuses(xs: List[CommitStatus], httpClient: Client): Task[Unit] = {
def setStatus(cm: CommitStatus): Task[Unit] = for {
endpoint <- toUri(cm.commit.url.replaceAll("git\\/commits", "statuses"))
target = claUrl(cm.commit.login.getOrElse("<invalid-user>"))
state = if (cm.isValid) "success" else "failure"
desc =
if (cm.isValid) "User signed CLA"
else "User needs to sign cla: https://www.lightbend.com/contribute/cla/scala"
statusReq <- postRequest(endpoint).map(_.withBody(Status(state, target, desc).asJson))
statusRes <- httpClient.expect(statusReq)(jsonOf[String])
print <- Task.now(println(statusRes))
} yield print
Task.gatherUnordered(xs.map(setStatus)).map(_ => ())
}
def checkPullRequest(issue: Issue): Task[Response] = {
val httpClient = PooledHttp1Client()
for {
// First get all the commits from the PR
endpoint <- toUri(commitsUrl(issue.number))
commitsReq <- getRequest(endpoint)
commitsRes <- httpClient.expect(commitsReq)(jsonOf[List[Commit]])
// Then get check the CLA of each commit
statuses <- checkCLA(commitsRes, httpClient)
// Send statuses to Github and exit
_ <- sendStatuses(statuses, httpClient)
_ <- shutdownClient(httpClient)
resp <- Ok("All statuses checked")
} yield resp
}
}
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