ReactiveCouchbase Plugin for Play framework 2.3

Current version

current dev version for Play framework 2.3 is 0.3 or 0.4-SNAPSHOT
- https://raw.github.com/ReactiveCouchbase/repository/master/releases
- https://raw.github.com/ReactiveCouchbase/repository/master/snapshots

Starter Kits

You can quickly bootstrap a project with the Java and Scala starter kits :

The binaries are here :

Just download the zip file, unzip it, change the app name/version in the build.sbt file and you're ready to go.

Basic Usage

Project configuration

in your build.sbt file add dependencies and resolvers like :

name := "myproject"

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayScala)

scalaVersion := "2.11.1"

libraryDependencies ++= Seq(
  cache,
  ws,
  "org.reactivecouchbase" %% "reactivecouchbase-play" % "0.3"
)

resolvers += "ReactiveCouchbase" at "https://raw.github.com/ReactiveCouchbase/repository/master/releases"

or if you use the good old project\Build.scala file :

import sbt._
import Keys._
import play.Play.autoImport._
import PlayKeys._
import play.PlayScala

object ApplicationBuild extends Build {

  lazy val root = Project(id = "My Project", base = file(".")).enablePlugins(PlayScala).settings(
    libraryDependencies ++= Seq(
      cache,
      ws,
      "org.reactivecouchbase" %% "reactivecouchbase-play" % "0.3"
    ),
    version := "1.0-SNAPSHOT",
    scalaVersion := "2.11.1",
    organization := "com.foo.bar",
    incOptions := incOptions.value.withNameHashing(true),
    resolvers += "ReactiveCouchbase repository" at "https://raw.github.com/ReactiveCouchbase/repository/master/releases"
  )
}

then create a conf/play.plugins file and add :

400:org.reactivecouchbase.play.plugins.CouchbasePlugin

add in your conf/application.conf file :


couchbase {
  buckets = [{
    host="127.0.0.1"
    port="8091"
    base="pools"
    bucket="bucketname"
    user=""
    pass=""
    timeout="0"
  }]
}

Standard usage from a controller

You will then be able to use the couchbase API from your Play controllers. The following code is asynchronous and uses Play's Action.async { ... }API under the hood. As you will need an execution context for all those async calls, you can use PlayCouchbase.couchbaseExecutor based on your application.conf file. You can of course use Play default Execution Context (through import play.api.libs.concurrent.Execution.Implicits._) or your own.

import play.api.mvc.{Action, Controller}
import play.api.libs.json._
import org.reactivecouchbase.play._
import play.api.Play.current

case class User(name: String, surname: String, email: String)

object UserController extends Controller with CouchbaseController {

  implicit val couchbaseExecutionContext = PlayCouchbase.couchbaseExecutor
  implicit val userReader = Json.reads[User]

  def getUser(key: String) = CouchbaseAction { bucket =>
    bucket.get[User](key).map { maybeUser =>
      maybeUser.map(user => Ok(views.html.user(user)).getOrElse(BadRequest(s"Unable to find user with key: $key"))
    }
  }
}

this code is a shortcut for

import play.api.mvc.{Action, Controller}
import play.api.libs.json._
import org.reactivecouchbase.play.Couchbase
import org.reactivecouchbase.play.CouchbaseBucket
import play.api.Play.current

case class User(name: String, surname: String, email: String)

object UserController extends Controller {

  implicit val couchbaseExecutionContext = PlayCouchbase.couchbaseExecutor
  implicit val userReader = Json.reads[User]

  def getUser(key: String) = Action.async {
    val bucket = PlayCouchbase.defaultBucket
    bucket.get[User](key).map { maybeUser =>
      maybeUser.map(user => Ok(views.html.user(user)).getOrElse(BadRequest(s"Unable to find user with key: $key"))
    }
  }
}

You can also access Couchbase from your Java application :

package controllers;

import models.ShortURL;
import org.reactivecouchbase.play.java.couchbase.Couchbase;
import org.reactivecouchbase.play.java.couchbase.CouchbaseBucket;
import play.libs.F;
import static play.libs.F.*;
import play.mvc.Controller;
import play.mvc.Result;

public class Application extends Controller {

    public static CouchbaseBucket bucket = Couchbase.bucket("bucket1");

    public static Result  getUser(final String key) {
        return async(
            bucket.get(key, User.class).map(new Function<User, Result>() {
                @Override
                public Result apply(User user) throws Throwable {
                    if (user == null) {
                        return badRequest("Unable to find user with key: " + key);
                    }
                    return ok(views.html.user.render(user));
                }
            })
        );
    }
}

and with Java 8

package controllers;

import models.ShortURL;
import org.reactivecouchbase.play.java.couchbase.Couchbase;
import org.reactivecouchbase.play.java.couchbase.CouchbaseBucket;
import play.libs.F;
import static play.libs.F.*;
import play.mvc.Controller;
import play.mvc.Result;

public class Application extends Controller {

    public static CouchbaseBucket bucket = Couchbase.bucket("bucket1");

    public static Result  getUser(final String key) {
        return async(
            bucket.get(key, User.class).map(user -> {
                if (user == null) {
                    return badRequest("Unable to find user with key: " + key);
                }
                return ok(views.html.user.render(user));
            })
        );
    }
}

You can of course connect many buckets with :

couchbase {

  ...

  buckets = [{
      host=["127.0.0.1", "192.168.0.42"]
      port="8091"
      base="pools"
      bucket="bucket1"
      user=""
      pass=""
      timeout="0"
  }, {
     host="127.0.0.1"
     port="8091"
     base="pools"
     bucket="bucket2"
     user=""
     pass=""
     timeout="0"
  }, {
     host="192.168.0.42"
     port="8091"
     base="pools"
     bucket="bucket3"
     user=""
     pass=""
     timeout="0"
  }]
}

then select one of them for each of your operation :

object UserController extends Controller with CouchbaseController {

  implicit val couchbaseExecutionContext = PlayCouchbase.couchbaseExecutor
  implicit val userReader = Json.reads[User]
  implicit val beerReader = Json.reads[Beer]

  def getUser(key: String) = CouchbaseAction("bucket1") { bucket =>
    bucket.get[User](key).map { maybeUser =>
      maybeUser.map(user => Ok(views.html.user(user)).getOrElse(BadRequest(s"Unable to find user with key: $key"))
    }
  }

  def getBeer(key: String) = CouchbaseAction("bucket2") { request => bucket =>
    bucket.get[Beer](key).map { maybeBeer =>
      maybeBeer.map(beer => Ok(views.html.beer(beer)).getOrElse(BadRequest(s"Unable to find beer with key: $key"))
    }
  }
}

Standard usage from a model

import play.api.libs.json._
import org.reactivecouchbase.play.Couchbase
import org.reactivecouchbase.play.CouchbaseBucket
import org.reactivecouchbase.client.OpResult
import play.api.Play.current

case class Beer(id: String, name: String, brewery: String) {
  def save(): Future[OpResult] = Beer.save(this)
  def remove(): Future[OpResult] = Beer.remove(this)
}

object Beer {

  implicit val beerFmt = Json.format[Beer]
  implicit val ec = PlayCouchbase.couchbaseExecutor

  def bucket = PlayCouchbase.bucket("default")

  def findById(id: String): Future[Option[Beer]] = {
    bucket.get[Beer](id)
  }

  def findAll(): Future[List[Beer]] = {
    bucket.find[Beer]("beer", "by_name")(new Query().setIncludeDocs(true).setStale(Stale.FALSE))
  }

  def findByName(name: String): Future[Option[Beer]] = {
    val query = new Query().setIncludeDocs(true).setLimit(1)
          .setRangeStart(ComplexKey.of(name))
          .setRangeEnd(ComplexKey.of(s"$name\uefff").setStale(Stale.FALSE))
    bucket.find[Beer]("beer", "by_name")(query).map(_.headOption)
  }

  def save(beer: Beer): Future[OpResult] = {
    bucket.set[Beer](beer.id, beer)
  }

  def remove(beer: Beer): Future[OpResult] = {
    bucket.delete(beer.id)
  }
}

or from a java model

package models;

import com.couchbase.client.protocol.views.ComplexKey;
import com.couchbase.client.protocol.views.Query;
import com.couchbase.client.protocol.views.Stale;
import org.reactivecouchbase.client.OpResult;
import org.reactivecouchbase.play.java.couchbase.Couchbase;
import org.reactivecouchbase.play.java.couchbase.CouchbaseBucket;
import play.libs.F;
import static play.libs.F.*;

import java.util.Collection;

public class ShortURL {

    public String id;
    public String originalUrl;

    public ShortURL() {}

    public ShortURL(String id, String originalUrl) {
        this.id = id;
        this.originalUrl = originalUrl;
    }

    public static CouchbaseBucket bucket = Couchbase.bucket("default");

    public static Promise<ShortURL> findById(String id) {
        return bucket.get(id, ShortURL.class);
    }

    public static Promise<Collection<ShortURL>> findAll() {
        return bucket.find("shorturls", "by_url",
            new Query().setIncludeDocs(true).setStale(Stale.FALSE), ShortURL.class);
    }

    public static Promise<Option<ShortURL>> findByURL(String url) {
        Query query = new Query()
                .setLimit(1)
                .setIncludeDocs(true)
                .setStale(Stale.FALSE)
                .setRangeStart(ComplexKey.of(url))
                .setRangeEnd(ComplexKey.of(url + "\uefff"));
        return bucket.find("shorturls", "by_url", query, ShortURL.class)
                .map(new Function<Collection<ShortURL>, Option<ShortURL>>() {
            @Override
            public Option<ShortURL> apply(Collection<ShortURL> shortURLs) throws Throwable {
                if (shortURLs.isEmpty()) {
                    return Option.None();
                }
                return Option.Some(shortURLs.iterator().next());
            }
        });
    }

    public static Promise<OpResult> save(ShortURL url) {
        return bucket.set(url.id, url);
    }

    public static Promise<OpResult> remove(ShortURL url) {
        return bucket.delete(url.id);
    }
}

and with Java 8

package models;

import com.couchbase.client.protocol.views.ComplexKey;
import com.couchbase.client.protocol.views.Query;
import com.couchbase.client.protocol.views.Stale;
import net.spy.memcached.ops.OperationStatus;
import org.reactivecouchbase.play.java.couchbase.Couchbase;
import org.reactivecouchbase.play.java.couchbase.CouchbaseBucket;
import play.libs.F;
import static play.libs.F.*;

import java.util.Collection;

public class ShortURL {

    public String id;
    public String originalUrl;

    public ShortURL() {}

    public ShortURL(String id, String originalUrl) {
        this.id = id;
        this.originalUrl = originalUrl;
    }

    public static CouchbaseBucket bucket = Couchbase.bucket("default");

    public static Promise<ShortURL> findById(String id) {
        return bucket.get(id, ShortURL.class);
    }

    public static Promise<Collection<ShortURL>> findAll() {
        return bucket.find("shorturls", "by_url",
            new Query().setIncludeDocs(true).setStale(Stale.FALSE), ShortURL.class);
    }

    public static Promise<Option<ShortURL>> findByURL(String url) {
        Query query = new Query()
                .setLimit(1)
                .setIncludeDocs(true)
                .setStale(Stale.FALSE)
                .setRangeStart(ComplexKey.of(url))
                .setRangeEnd(ComplexKey.of(url + "\uefff"));
        return bucket.find("shorturls", "by_url", query, ShortURL.class)
            .map(shortURLs -> {
                if (shortURLs.isEmpty()) {
                    return Option.None();
                }
                return Option.Some(shortURLs.iterator().next());
            });
    }

    public static Promise<OperationStatus> save(ShortURL url) {
        return bucket.set(url.id, url);
    }

    public static Promise<OperationStatus> remove(ShortURL url) {
        return bucket.delete(url.id);
    }
}

Capped buckets and tailable queries

Play2-couchbase provides a way to simulate capped buckets (http://docs.mongodb.org/manual/core/capped-collections/). You can see a capped bucket as a circular buffer. Once the buffer is full, the oldest entry is removed from the bucket.

Here, the bucket isn't really capped at couchbase level. It is capped at play2-couchbase level. You can use a bucket as a capped bucket using :

def bucket = PlayCouchbase.cappedBucket("default", 100) // here I use the default bucket as a capped bucket of size 100

of course, only data inserted with this CappedBucket object are considered for capped bucket features.

val john = Json.obj("name" -> "John", "fname" -> "Doe")

for (i <- 0 to 200) {
    bucket.insert(UUID.randomUUID().toString, john)
}
// still 100 people in the bucket (and possibly other data inserted with standard API)

When a json object is inserted, a timestamp is add to the object and this timestamp will be used to manage all the capped bucket features.

The nice part with capped buckets is the tail function. It's like using a tail -fcommand on the datas of the capped bucket

def tailf = Action.async {
    val enumerator1 = bucket.tail[JsValue]()
    val enumerator2 = bucket.tail[JsValue](1265457L) // start to read data from 1265457L timestamp
    val enumerator3 = bucket.tail[JsValue](1265457L, 200, TimeUnit.MILLISECONDS) // update every 200 milliseconds
    enumerator1.map( Ok.chunked( _ ) )
}

CRUD Application

If you want to quickly bootstrap a project with Play2 Couchbase, it's pretty easy, you can use the CRUD utilities.

To do so, first create a model :

case class ShortURL(id: String, originalUrl: String)

then declare an implicit Json Formatter that will be used for Json serialization/deserialization

import play.api.libs.json.Json

object ShortURL {
  implicit val fmt = Json.format[ShortURL]
}

Now you can do two things :

create a CRUD source
create a CRUD controller

let's try the CRUD controller

import org.reactivecouchbase.play.crud.CouchbaseCrudSourceController
import models.ShortURL
import models.ShortURLs.fmt
import org.reactivecouchbase.play._
import play.api.Play.current

object ShortURLController extends CouchbaseCrudSourceController[ShortURL] {
  def bucket = PlayCouchbase.bucket("default")
}

and add the following route to your routes file

->      /urls                       controllers.ShortURLController

now you will be able to do :


GET     /urls/?doc=docName&view=viewName                    # get all urls according to a view
POST    /urls/                                              # create a url
GET     /urls/{id}                                          # get a url
PUT     /urls/{id}                                          # update url
PUT     /urls/{id}/partial                                  # partially update url
DELETE  /urls/{id}                                          # delete url
POST    /urls/find/?doc=docName&view=viewName&q=query       # search urls
GET     /urls/stream/?doc=docName&view=viewName&q=query     # search urls as HTTP stream

POST    /urls/batch                                         # create multiple urls
PUT     /urls/batch                                         # update multiple urls
DELETE  /urls/batch                                         # delete multiple urls

it is also possible to define default design doc name, view and id key :

object ShortURLController extends CouchbaseCrudSourceController[ShortURL] {
  def bucket = PlayCouchbase.bucket("default")
  override def defaultViewName = "by_url"
  override def defaultDesignDocname = "shorturls"
  override def idKey = "__myAwesomeIdKey"
}

you can also only define a CRUD source containing all needed methods with :

import org.reactivecouchbase.play.crud.CouchbaseCrudSource
import models.ShortURL
import models.ShortURLs.fmt
import org.reactivecouchbase.play.Couchbase
import play.api.Play.current

object ShortURLSource extends CouchbaseCrudSource[ShortURL]( Couchbase.bucket("default") ) {}

You can also access this feature from Java

public class ShortURLController extends CrudSourceController<ShortURL> {

    private final CrudSource<ShortURL> source = new CrudSource<ShortURL>( Couchbase.bucket("default"), ShortURL.class );
    //private final CrudSource<ShortURL> source = new CrudSource<ShortURL>( Couchbase.bucket("default"), "__myAwesomeIdKey", ShortURL.class );

    @Override
    public CrudSource<ShortURL> getSource() {
        return source;
    }

    @Override
    public String defaultDesignDocname() {
        return "shorturls";
    }

    @Override
    public String defaultViewName() {
        return "by_url";
    }
}

You will need a controller instanciator for that :

import controllers.ShortURLController;
import play.GlobalSettings;

public class Global extends GlobalSettings {
    // You can really do something more clever here ;-)
    public <A> A getControllerInstance(java.lang.Class<A> aClass) throws java.lang.Exception {
        if (aClass.equals(ShortURLController.class)) {
            return (A) new ShortURLController();
        }
        throw new RuntimeException("Cannot instanciate " + aClass.getName());
    }
}

and also to define routes (yeah I know it's boring, but it's a work in progress right now)


GET     /urls/                      @controllers.ShortURLController.find()
POST    /urls/                      @controllers.ShortURLController.insert()
POST    /urls/find                  @controllers.ShortURLController.find()
POST    /urls/batch                 @controllers.ShortURLController.batchInsert()
PUT     /urls/batch                 @controllers.ShortURLController.batchUpdate()
DELETE  /urls/batch                 @controllers.ShortURLController.batchDelete()
PUT     /urls/:id/partial           @controllers.ShortURLController.updatePartial(id)
GET     /urls/:id                   @controllers.ShortURLController.get(id)
DELETE  /urls/:id                   @controllers.ShortURLController.delete(id)
PUT     /urls/:id                   @controllers.ShortURLController.update(id)

Note : You can also use the awesome play-autosource project (https://github.com/mandubian/play-autosource) that comes with Couchbase support

ReactiveCouchbase N1QL search

N1QL is the Couchbase Query Language. The N1QL Developer Preview 2 (DP2) is a pre-beta release of the language and is available at

http://www.couchbase.com/communities/n1ql

The ReactiveCouchbase plugin offers a very experimental access to N1QL based on the N1QL DP1. As it is experimental, I can not ensure that this feature will not massively change and/or will be continued.

First setup your N1QL query server. Download it and expand it. Then connect it to your Couchbase server.

./cbq-engine -couchbase http://:8091/`

Now you have to configure N1QL in you conf/application.conf file add :


couchbase {
   n1ql {
     host="127.0.0.1"
     port=8093
   }
}

And now you can use it from your application

import play.api.libs.json._
import org.reactivecouchbase._
import org.reactivecouchbase.play.plugins.CouchbaseN1QLPlugin._
import play.api.libs.iteratee.{Enumerator, Enumeratee}

case class Person(fname: String, age: Int)

object N1QLQuerier extends Controller {

  implicit val personFormat = Json.format[Person]

  implicit val bucket = PlayCouchbase.bucket("default")

  implicit val couchbaseExecutionContext = PlayCouchbase.couchbaseExecutor

  def find(age: Int) = Action.async {
    N1QL( s""" SELECT fname, age FROM tutorial WHERE age > ${age} """, driver )
                                                   .toList[Person].map { persons =>
      Ok(s"Persons older than ${age}", persons))
    }
  }
}

or use it the Enumerator way

import play.api.libs.json._
import org.reactivecouchbase._
import org.reactivecouchbase.play.plugins.CouchbaseN1QLPlugin._
import play.api.libs.iteratee.{Enumerator, Enumeratee}

case class Person(fname: String, age: Int)

object N1QLQuerier extends Controller {

  implicit val personFormat = Json.format[Person]

  implicit val bucket = PlayCouchbase.bucket("default")

  implicit val couchbaseExecutionContext = PlayCouchbase.couchbaseExecutor

  def find(age: Int) = Action.async {
    N1QL( s""" SELECT fname, age FROM tutorial WHERE age > ${age} """, driver )
                                    .enumerate[Person].map { enumerator =>
       Ok.chunked((enumerator &>
        Enumeratee.collect[Person] { case p@Person(_, age) if age < 50 => p } ><>
        Enumeratee.map[Person](personFormat.writes)) >>>
        Enumerator.eof))
    }
  }
}

Use Couchbase as Cache implementation

in conf/play.plugins file and add : 500:org.reactivecouchbase.play.plugins.CouchbaseCachePlugin

then you need to add the following to your configuration

couchbase {
  cache {
    bucket="name of the bucket to use"
    enabled=true
  }

  ...

}

you can also specify a common namespace for the cache keys with

couchbase {
  cache {
    bucket="name of the bucket to use"
    enabled=true
    namespace="play-cache."
  }

  ...

}

then you can use your Play Cache the standard way

Cache.set("item.key", connectedUser)
val maybeUser: Option[User] = Cache.getAs[User]("item.key")

Synchonize Couchbase design documents

You can use CouchbaseEvolutionsPlugin to automaticaly create your design documents at application start from json files.

in conf/play.plugins file and add : 600:org.reactivecouchbase.play.plugins.CouchbaseEvolutionsPlugin

then configure the plugin

couchbase {

  ...
  evolutions {
    #documents = ...    #optional, default conf/views
    #disabled = ...     #optional, default false
    #use.locks = ...    #optional, default true

    default { #default is the name of your bucket
        apply = true
        synchronise = true
    }
  }

}

The plugin will search your design documents in folders named as your buckets in the couchbase.evolutions.documents value

conf
    views
        default
            tweets.json
            users.json
            ...
        ...

Your json might look like

{
    "views":{
       "withMedia": {
           "map": "function (doc, meta) {\n if(doc.entities.media)\n  emit(dateToArray(doc.created_at))\n}"
       }
    }
}

The name of the design document will be the name of the json file. You can specify another one in the json

{
  "name":"my_doc",
    "views":{
       "withMedia": {
           "map": "function (doc, meta) {\n if(doc.entities.media)\n  emit(dateToArray(doc.created_at))\n}"
       }
    }
}

Note : Design documents synchronisation is not yet available

Automatically insert documents at startup

You can use CouchbaseFixturesPlugin to automaticaly insert data into buckets.

in conf/play.plugins file and add : 700:org.reactivecouchbase.play.plugins.CouchbaseFixturesPlugin

then configure the plugin

couchbase {
  ...
  fixtures {
    #documents = ...    #optional, default conf/fixtures
    #disabled = ...     #optional, default false

    default { #default is the name of your bucket
      insert = true
      key = "_id" # the json member to extract key for insertion
    }
  }
}

The plugin will search data in folders named as your buckets in the couchbase.fixtures.documents value

conf
    fixtures
        default
            users.json

Your json MUST BE an ARRAY structure containing your JSON documents (even if there is only one doc inside) and might look like :

[
    {
        "_id": "1",
        "name": "John Doe",
        "email": "[email protected]",
        "password": "password"
    },
    {
        "_id": "2",
        "name": "Jane Doe",
        "email": "[email protected]",
        "password": "password"
    }
]

Note : Your documents will be overwritten at each startup. Removed json files won't be removed from your buckets.

ReactiveCouchbase Play specific configuration cheatsheet

Here is the complete plugin configuration with default values


couchbase {
   useplayec=true                    # the plugin can use play.api.libs.concurrent.Execution.Implicits.defaultContext as execution context, optional
   cache {                           # cache related configuration, optional
     namespace=""                    # key prefix if couchbase used as cache with the cache plugin, optional
     enabled=false                   # enable cache with couchbase, optional
   }
   fixtures {                        # fixtures related configuration, optional
     disabled=false                  # disable fixtures, optional
     documents="conf/fixtures"       # path for fixtures files, optional
     $bucketName {
       insert=true                   # insert fixtures, optional
       key="_id"                     # key name for each fixture object, optional
     }
   }
   evolutions {                      # evolutions related configuration, optional
     disabled=false                  # disable evolutions, optional
     documents="conf/views"          # path for evolution files, optional
     use.locks=true                  # use locks for evolutions, optional
     $bucketName {
       apply=true                    # apply evolution on start
       synchronize=true              # synchronize with existing
     }
   }
}

Name		Name	Last commit message	Last commit date
Latest commit History 62 Commits
plugin/src/main		plugin/src/main
project		project
samples		samples
.gitignore		.gitignore
LICENSE.txt		LICENSE.txt
NOTICE.txt		NOTICE.txt
README.md		README.md

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ReactiveCouchbase Plugin for Play framework 2.3

Contents

Current version

Starter Kits

Basic Usage

Project configuration

Standard usage from a controller

Standard usage from a model

Capped buckets and tailable queries

CRUD Application

ReactiveCouchbase N1QL search

Use Couchbase as Cache implementation

Synchonize Couchbase design documents

Automatically insert documents at startup

ReactiveCouchbase Play specific configuration cheatsheet

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piyushdaftary/ReactiveCouchbase-play

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ReactiveCouchbase Plugin for Play framework 2.3

Contents

Current version

Starter Kits

Basic Usage

Project configuration

Standard usage from a controller

Standard usage from a model

Capped buckets and tailable queries

CRUD Application

ReactiveCouchbase N1QL search

Use Couchbase as Cache implementation

Synchonize Couchbase design documents

Automatically insert documents at startup

ReactiveCouchbase Play specific configuration cheatsheet

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