ETCM-365: Version info in Hello.clientId

build.sbt

@@ -66,6 +66,11 @@ val root = {
   val root = project
     .in(file("."))
     .configs(Integration, Benchmark, Evm, Ets, Snappy, Rpc)
+    .enablePlugins(BuildInfoPlugin)
+    .settings(
+      buildInfoKeys := Seq[BuildInfoKey](name, version, git.gitHeadCommit),
+      buildInfoPackage := "io.iohk.ethereum.utils"
+    )
     .settings(commonSettings: _*)
     .settings(
       libraryDependencies ++= dep
@@ -116,8 +121,9 @@ Test / parallelExecution := true
 testOptions in Test += Tests.Argument("-oDG")
 
 // protobuf compilation
+// Into a subdirectory of src_managed to avoid it deleting other generated files; see https://github.com/sbt/sbt-buildinfo/issues/149
 PB.targets in Compile := Seq(
-  scalapb.gen() -> (sourceManaged in Compile).value
+  scalapb.gen() -> (sourceManaged in Compile).value / "protobuf"
 )
 
 // have the protobuf API version file as a resource

project/plugins.sbt

@@ -6,5 +6,7 @@ addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.7.5")
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings" % "3.0.0")
 addSbtPlugin("com.thesamet" % "sbt-protoc" % "0.99.25")
 addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.5.1")
+addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.9.0")
+addSbtPlugin("com.typesafe.sbt" % "sbt-git" % "1.0.0")
 
 libraryDependencies += "com.trueaccord.scalapb" %% "compilerplugin" % "0.6.6"

src/main/resources/application.conf

@@ -1,6 +1,6 @@
 mantis {
-  # Identifier used when connecting to other clients
-  client-id = "mantis"
+  # Optionally augment the client ID sent in Hello messages.
+  client-id = null
 
   # Version string (reported by an RPC method)
   client-version = "mantis/v2.0"

src/main/scala/io/iohk/ethereum/utils/Config.scala

@@ -23,7 +23,8 @@ object Config {
 
   val testmode: Boolean = config.getBoolean("testmode")
 
-  val clientId: String = config.getString("client-id")
+  val clientId: String =
+    VersionInfo.nodeName(ConfigUtils.getOptionalValue(config, "client-id", _.getString("client-id")))
 
   val clientVersion: String = config.getString("client-version")
 

src/main/scala/io/iohk/ethereum/utils/VersionInfo.scala

@@ -0,0 +1,44 @@
+package io.iohk.ethereum.utils
+
+object VersionInfo {
+
+  /** Produce a node name that get sent in `WireProtocol.Hello.clientId` according to Ethereum conventions.
+    *
+    * Check out examples on https://etcnodes.org
+    *
+    * e.g.
+    * - mantis/v3.0-cd5ae33/linux-amd64/ubuntu-openjdk64bitservervm-java-11.0.9
+    * - besu/v20.10.0/linux-x86_64/oracle_openjdk-java-11
+    * - coregeth/v1.11.8-stable-305b5089/linux-amd64/go1.14.4
+    */
+  def nodeName(maybeClientId: Option[String] = None): String = {
+    val app = {
+      val name = BuildInfo.name
+      val id = maybeClientId.map("-" + _).getOrElse("")
+      s"$name$id"
+    }
+    val version = {
+      val version = BuildInfo.version
+      val commit = BuildInfo.gitHeadCommit.map("-" + _.take(7)).getOrElse("")
+      s"v$version$commit"
+    }
+    val os = {
+      val name = norm(prop("os.name"))
+      val arch = norm(prop("os.arch"))
+      s"$name-$arch"
+    }
+    val vm = {
+      val vendor = norm(prop("java.vendor"))
+      val vmName = norm(prop("java.vm.name"))
+      val version = prop("java.version")
+      s"$vendor-$vmName-java-$version"
+    }
+    s"$app/$version/$os/$vm"
+  }
+
+  private def prop(name: String) =
+    System.getProperty(name)
+
+  private def norm(value: String) =
+    value.toLowerCase.replaceAll("[^a-z0-9]+", "")
+}

src/test/resources/application.conf

@@ -1,7 +1,5 @@
 mantis {
 
-  client-id = "mantis"
-
   datadir = "/tmp/mantis-test/"
 
   secure-random-algo = "NativePRNGNonBlocking"

src/test/scala/io/iohk/ethereum/utils/ConfigSpec.scala

@@ -0,0 +1,10 @@
+package io.iohk.ethereum.utils
+
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+class ConfigSpec extends AnyFlatSpec with Matchers {
+  "clientId" should "by default come from VersionInfo" in {
+    Config.clientId shouldBe VersionInfo.nodeName()
+  }
+}

src/test/scala/io/iohk/ethereum/utils/VersionInfoSpec.scala

@@ -0,0 +1,16 @@
+package io.iohk.ethereum.utils
+
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+class VersionInfoSpec extends AnyFlatSpec with Matchers {
+  behavior of "nodeName"
+
+  it should "preserve major and minor Java version" in {
+    VersionInfo.nodeName() should fullyMatch regex """mantis/v\d.*-[a-z0-9]{7}/.+-.+/.+-.+-java-\d+\.\d+.*"""
+  }
+
+  it should "augment the name with an identity" in {
+    VersionInfo.nodeName(Some("etc")) should startWith("mantis-etc/")
+  }
+}