dajac commented on a change in pull request #9628:
URL: https://github.com/apache/kafka/pull/9628#discussion_r534287486



##########
File path: core/src/main/scala/kafka/server/AdminManager.scala
##########
@@ -920,32 +954,49 @@ class AdminManager(val config: KafkaConfig,
         !name.isDefined || !strict
     }
 
-    def fromProps(props: Map[String, String]): Map[String, Double] = {
-      props.map { case (key, value) =>
-        val doubleValue = try value.toDouble catch {
-          case _: NumberFormatException =>
-            throw new IllegalStateException(s"Unexpected client quota 
configuration value: $key -> $value")
-        }
-        key -> doubleValue
-      }
-    }
-
-    (userEntries ++ clientIdEntries ++ bothEntries).map { case ((u, c), p) =>
+    (userEntries ++ clientIdEntries ++ bothEntries).flatMap { case ((u, c), p) 
=>
       val quotaProps = p.asScala.filter { case (key, _) => 
QuotaConfigs.isQuotaConfig(key) }
       if (quotaProps.nonEmpty && matches(userComponent, u) && 
matches(clientIdComponent, c))
         Some(userClientIdToEntity(u, c) -> fromProps(quotaProps))
       else
         None
-    }.flatten.toMap
+    }.toMap
+  }
+
+  def handleDescribeIpQuotas(ipComponent: Option[ClientQuotaFilterComponent], 
strict: Boolean): Map[ClientQuotaEntity, Map[String, Double]] = {
+    val ip = ipComponent.flatMap(c => toOption(c.`match`))
+    val exactIp = wantExact(ipComponent)
+    val allIps = ipComponent.exists(_.`match` == null) || (ipComponent.isEmpty 
&& !strict)
+    val ipEntries = if (exactIp)
+      Map(Some(ip.get) -> adminZkClient.fetchEntityConfig(ConfigType.Ip, 
sanitized(ip)))
+    else if (allIps)
+      adminZkClient.fetchAllEntityConfigs(ConfigType.Ip).map { case (name, 
props) =>
+        Some(desanitizeEntityName(name)) -> props
+      }
+    else
+      Map.empty
+
+    def ipToQuotaEntity(ip: Option[String]): ClientQuotaEntity = {
+      new ClientQuotaEntity(ip.map(ipName => ClientQuotaEntity.IP -> 
ipName).toMap.asJava)
+    }
+
+    ipEntries.flatMap { case (ip, props) =>
+      val ipQuotaProps = props.asScala.filter { case (key, _) => 
DynamicConfig.Ip.names.contains(key) }
+      if (ipQuotaProps.nonEmpty)
+        Some(ipToQuotaEntity(ip) -> fromProps(ipQuotaProps))
+      else
+        None
+    }
   }
 
   def alterClientQuotas(entries: Seq[ClientQuotaAlteration], validateOnly: 
Boolean): Map[ClientQuotaEntity, ApiError] = {
     def alterEntityQuotas(entity: ClientQuotaEntity, ops: 
Iterable[ClientQuotaAlteration.Op]): Unit = {
-      val (path, configType, configKeys) = 
entityToSanitizedUserClientId(entity) match {
-        case (Some(user), Some(clientId)) => (user + "/clients/" + clientId, 
ConfigType.User, DynamicConfig.User.configKeys)
-        case (Some(user), None) => (user, ConfigType.User, 
DynamicConfig.User.configKeys)
-        case (None, Some(clientId)) => (clientId, ConfigType.Client, 
DynamicConfig.Client.configKeys)
-        case _ => throw new InvalidRequestException("Invalid empty client 
quota entity")
+      val (path, configType, configKeys) = parseAndSanitizeQuotaEntity(entity) 
match {
+        case (Some(user), Some(clientId), None) => (user + "/clients/" + 
clientId, ConfigType.User, DynamicConfig.User.configKeys)
+        case (Some(user), None, None) => (user, ConfigType.User, 
DynamicConfig.User.configKeys)
+        case (None, Some(clientId), None) => (clientId, ConfigType.Client, 
DynamicConfig.Client.configKeys)
+        case (None, None, Some(ip)) => (ip, ConfigType.Ip, 
DynamicConfig.Ip.configKeys)
+        case _ => throw new InvalidRequestException("Invalid client quota 
entity")

Review comment:
       Should we also provide a better error message if the user mixes up IP 
and user/clientId?

##########
File path: core/src/main/scala/kafka/server/AdminManager.scala
##########
@@ -920,32 +954,49 @@ class AdminManager(val config: KafkaConfig,
         !name.isDefined || !strict
     }
 
-    def fromProps(props: Map[String, String]): Map[String, Double] = {
-      props.map { case (key, value) =>
-        val doubleValue = try value.toDouble catch {
-          case _: NumberFormatException =>
-            throw new IllegalStateException(s"Unexpected client quota 
configuration value: $key -> $value")
-        }
-        key -> doubleValue
-      }
-    }
-
-    (userEntries ++ clientIdEntries ++ bothEntries).map { case ((u, c), p) =>
+    (userEntries ++ clientIdEntries ++ bothEntries).flatMap { case ((u, c), p) 
=>
       val quotaProps = p.asScala.filter { case (key, _) => 
QuotaConfigs.isQuotaConfig(key) }
       if (quotaProps.nonEmpty && matches(userComponent, u) && 
matches(clientIdComponent, c))
         Some(userClientIdToEntity(u, c) -> fromProps(quotaProps))
       else
         None
-    }.flatten.toMap
+    }.toMap

Review comment:
       I am not sure to understand why you have removed `flatten` here. Could 
you elaborate a bit on this please?

##########
File path: core/src/main/scala/kafka/admin/ConfigCommand.scala
##########
@@ -56,11 +56,12 @@ import scala.collection._
  *                          --entity-type users --entity-name <user-principal> 
--entity-type clients --entity-name <client-id>
  *     <li> broker: --broker <broker-id> OR --entity-type brokers 
--entity-name <broker-id>
  *     <li> broker-logger: --broker-logger <broker-id> OR --entity-type 
broker-loggers --entity-name <broker-id>
+ *     <li> ip: --IP <ip> OR --entity-type IPs --entity-name <ip>
  * </ul>
- * --entity-type <users|clients|brokers> --entity-default may be specified in 
place of --entity-type <users|clients|brokers> --entity-name <entityName>
- * when describing or altering default configuration for users, clients, or 
brokers, respectively.
- * Alternatively, --user-defaults, --client-defaults, or --broker-defaults may 
be specified in place of
- * --entity-type <users|clients|brokers> --entity-default, respectively.
+ * --entity-type <users|clients|brokers|IPs> --entity-default may be specified 
in place of --entity-type <users|clients|brokers|IPs> --entity-name <entityName>
+ * when describing or altering default configuration for users, clients, 
brokers, or IPs, respectively.
+ * Alternatively, --user-defaults, --client-defaults, --broker-defaults, or 
--IP-defaults may be specified in place of

Review comment:
       `--IP-defaults` looks pretty bad. I think that we should definitely use 
lower-case.

##########
File path: 
clients/src/main/java/org/apache/kafka/common/quota/ClientQuotaEntity.java
##########
@@ -32,6 +32,7 @@
      */
     public static final String USER = "user";
     public static final String CLIENT_ID = "client-id";
+    public static final String IP = "IP";

Review comment:
       I would also make it lower-case for consistency.




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