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Java Client Library for Cloud Foundry

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# Cloud Foundry Java Client
[![Maven Central](https://img.shields.io/maven-central/v/org.cloudfoundry/cloudfoundry-client)](https://search.maven.org/search?q=g:org.cloudfoundry%20AND%20a:cloudfoundry-client%20AND%20v)

| Artifact | Javadocs
| -------- | --------
| `cloudfoundry-client`         | [![javadoc](https://javadoc.io/badge2/org.cloudfoundry/cloudfoundry-client/javadoc.svg)](https://javadoc.io/doc/org.cloudfoundry/cloudfoundry-client)
| `cloudfoundry-client-reactor` | [![javadoc](https://javadoc.io/badge2/org.cloudfoundry/cloudfoundry-client-reactor/javadoc.svg)](https://javadoc.io/doc/org.cloudfoundry/cloudfoundry-client-reactor)
| `cloudfoundry-operations`     | [![javadoc](https://javadoc.io/badge2/org.cloudfoundry/cloudfoundry-operations/javadoc.svg)](https://javadoc.io/doc/org.cloudfoundry/cloudfoundry-operations)
| `cloudfoundry-util`           | [![javadoc](https://javadoc.io/badge2/org.cloudfoundry/cloudfoundry-util/javadoc.svg)](https://javadoc.io/doc/org.cloudfoundry/cloudfoundry-util)

The `cf-java-client` project is a Java language binding for interacting with a Cloud Foundry instance.  The project is broken up into a number of components that expose different levels of abstraction depending on need.

* `cloudfoundry-client` – Interfaces, request, and response objects mapping to the [Cloud Foundry REST APIs][a].  This project has no implementation and therefore cannot connect to a Cloud Foundry instance on its own.
* `cloudfoundry-client-reactor` – The default implementation of the `cloudfoundry-client` project.  This implementation is based on Reactor Netty [`HttpClient`][h].
* `cloudfoundry-operations` – An API and implementation that corresponds to the [Cloud Foundry CLI][c] operations.  This project builds on the `cloudfoundry-client` and therefore has a single implementation.

## Versions
The Cloud Foundry Java Client has two active versions. The `6.x` line includes breaking changes (see below), while the `5.x` line maintains backward compatibility.

## Breaking Changes (6.x)

### `DopplerClient.recentLogs()` — Recent Logs via Doppler

> [!WARNING]
> **Removed since cf-java-client `6.0.x`**
>
> The `DopplerClient.recentLogs()` endpoint (and the related `RecentLogsRequest` / `LogMessage` types from the `org.cloudfoundry.doppler` package) have been **removed**.
>
> This API relied on the [Loggregator][loggregator] Doppler/Traffic Controller endpoint `/apps/{id}/recentlogs`, which was removed in **Loggregator ≥ 107.0**.
> The affected platform versions are:
>
> | Platform | Last version with Doppler recent-logs support |
> | -------- | --------------------------------------------- |
> | CF Deployment (CFD) | `< 24.3` |
> | Tanzu Application Service (TAS) | `< 4.0` |
>
> **Migration:** Replace any call to `DopplerClient.recentLogs()` with [`LogCacheClient.read()`][log-cache-api] (available via `org.cloudfoundry.logcache.v1.LogCacheClient`).
>
> ```java
> // Before (deprecated)
> dopplerClient.recentLogs(RecentLogsRequest.builder()
>     .applicationId(appId)
>     .build());
>
> // After
> logCacheClient.read(ReadRequest.builder()
>     .sourceId(appId)
>     .envelopeTypes(EnvelopeType.LOG)
>     .build());
> ```
>
> The return type and envelope objects differ between the two APIs:
>
> | | Doppler (`org.cloudfoundry.doppler`) | Log Cache (`org.cloudfoundry.logcache.v1`) |
> |---|---|---|
> | **Return type** | `Flux<Envelope>` | `Mono<ReadResponse>` → unpack via `response.getEnvelopes().getBatch()` |
> | **Log access** | `envelope.getLogMessage()` → `LogMessage` | `envelope.getLog()` → `Log` |
> | **Message text** | `logMessage.getMessage()` | `log.getPayloadAsText()` |
> | **Message type** | `MessageType.OUT` / `ERR` | `LogType.OUT` / `ERR` |
> | **Source metadata** | `logMessage.getSourceType()`, `.getSourceInstance()` | `envelope.getTags().get("source_type")`, `envelope.getInstanceId()` |
>
> See the [`org.cloudfoundry.doppler`][doppler-pkg] and [`org.cloudfoundry.logcache.v1`][logcache-pkg] Javadoc for full type details.

> [!NOTE]
> **Operations API users:** Use `Applications.logs(ApplicationLogsRequest)` instead of the removed `Applications.logs(LogsRequest)`.

### `Applications.logs(LogsRequest)` — Removed

> [!WARNING]
> **Removed since cf-java-client `6.0.x`**
> The `Applications.logs(LogsRequest)` method (and the `LogsRequest` type) have been **removed**.
>
> **Migration:** Use `Applications.logs(ApplicationLogsRequest)` instead. For recent logs, set `recent(true)` (the default). For streaming, set `recent(false)`.

[loggregator]: https://github.com/cloudfoundry/loggregator
[log-cache-api]: https://github.com/cloudfoundry/log-cache

## Dependencies
Most projects will need two dependencies; the Operations API and an implementation of the Client API.  For Maven, the dependencies would be defined like this:

```xml
<dependencies>
    <dependency>
        <groupId>org.cloudfoundry</groupId>
        <artifactId>cloudfoundry-client-reactor</artifactId>
        <version>latest.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.cloudfoundry</groupId>
        <artifactId>cloudfoundry-operations</artifactId>
        <version>latest.RELEASE</version>
    </dependency>
    ...
</dependencies>
```

Snapshot artifacts can be found in the Spring snapshot repository:

```xml
<repositories>
    <repository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>https://repo.spring.io/snapshot</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
    ...
</repositories>
```

For Gradle, the dependencies would be defined like this:

```groovy
dependencies {
    compile 'org.cloudfoundry:cloudfoundry-client-reactor:<latest>.RELEASE'
    compile 'org.cloudfoundry:cloudfoundry-operations:<latest>.RELEASE'
    ...
}
```

Snapshot artifacts can be found in the Spring snapshot repository:

```groovy
repositories {
    maven { url 'https://repo.spring.io/snapshot' }
    ...
}
```

## Usage
Both the `cloudfoundry-operations` and `cloudfoundry-client` projects follow a ["Reactive"][r] design pattern and expose their responses with [Project Reactor][p] `Monos`s and `Flux`s.

### `CloudFoundryClient`, `DopplerClient`, `UaaClient` Builders

> [!NOTE]
> **`DopplerClient` — partial deprecation:** The `recentLogs()` method on `DopplerClient` is deprecated and only works against Loggregator \< 107.0 (CFD \< 24.3 / TAS \< 4.0). See the [Deprecations](#deprecations) section above for the migration path to `LogCacheClient`.

The lowest-level building blocks of the API are `ConnectionContext` and `TokenProvider`.  These types are intended to be shared between instances of the clients, and come with out of the box implementations.  To instantiate them, you configure them with builders:

```java
DefaultConnectionContext.builder()
    .apiHost(apiHost)
    .build();

PasswordGrantTokenProvider.builder()
    .password(password)
    .username(username)
    .build();
```

In Spring-based applications, you'll want to encapsulate them in bean definitions:

```java
@Bean
DefaultConnectionContext connectionContext(@Value("${cf.apiHost}") String apiHost) {
    return DefaultConnectionContext.builder()
        .apiHost(apiHost)
        .build();
}

@Bean
PasswordGrantTokenProvider tokenProvider(@Value("${cf.username}") String username,
                                         @Value("${cf.password}") String password) {
    return PasswordGrantTokenProvider.builder()
        .password(password)
        .username(username)
        .build();
}
```

`CloudFoundryClient`, `DopplerClient`, and `UaaClient` are only interfaces.  Each has a [Reactor][p]-based implementation.  To instantiate them, you configure them with builders:

```java
ReactorCloudFoundryClient.builder()
    .connectionContext(connectionContext)
    .tokenProvider(tokenProvider)
    .build();

ReactorDopplerClient.builder()
    .connectionContext(connectionContext)
    .tokenProvider(tokenProvider)
    .build();

ReactorUaaClient.builder()
    .connectionContext(connectionContext)
    .tokenProvider(tokenProvider)
    .build();
```

In Spring-based applications, you'll want to encapsulate them in bean definitions:

```java
@Bean
ReactorCloudFoundryClient cloudFoundryClient(ConnectionContext connectionContext, TokenProvider tokenProvider) {
    return ReactorCloudFoundryClient.builder()
        .connectionContext(connectionContext)
        .tokenProvider(tokenProvider)
        .build();
}

@Bean
ReactorDopplerClient dopplerClient(ConnectionContext connectionContext, TokenProvider tokenProvider) {
    return ReactorDopplerClient.builder()
        .connectionContext(connectionContext)
        .tokenProvider(tokenProvider)
        .build();
}

@Bean
ReactorUaaClient uaaClient(ConnectionContext connectionContext, TokenProvider tokenProvider) {
    return ReactorUaaClient.builder()
        .connectionContext(connectionContext)
        .tokenProvider(tokenProvider)
        .build();
}
```

### `CloudFoundryOperations` Builder

The `CloudFoundryClient`, `DopplerClient`, and `UaaClient`s provide direct access to the raw REST APIs.  This level of abstraction provides the most detailed and powerful access to the Cloud Foundry instance, but also requires users to perform quite a lot of orchestration on their own.  Most users will instead want to work at the `CloudFoundryOperations` layer.  Once again this is only an interface and the default implementation of this is the `DefaultCloudFoundryOperations`.  To instantiate one, you configure it with a builder:

**NOTE:** The `DefaultCloudfoundryOperations` type does not require all clients in order to run.  Since not all operations touch all kinds of clients, you can selectively configure the minimum needed.  If a client is missing, the first invocation of a method that requires that client will return an error.

```java
DefaultCloudFoundryOperations.builder()
    .cloudFoundryClient(cloudFoundryClient)
    .dopplerClient(dopplerClient)
    .uaaClient(uaaClient)
    .organization("example-organization")
    .space("example-space")
    .build();
```

In Spring-based applications, you'll want to encapsulate this in a bean definition as well:

```java
@Bean
DefaultCloudFoundryOperations cloudFoundryOperations(CloudFoundryClient cloudFoundryClient,
                                                     DopplerClient dopplerClient,
                                                     UaaClient uaaClient,
                                                     @Value("${cf.organization}") String organization,
                                                     @Value("${cf.space}") String space) {
    return DefaultCloudFoundryOperations.builder()
            .cloudFoundryClient(cloudFoundryClient)
            .dopplerClient(dopplerClient)
            .uaaClient(uaaClient)
            .organization(organization)
            .space(space)
            .build();
}
```

### `CloudFoundryOperations` APIs

Once you've got a reference to the `CloudFoundryOperations`, it's time to start making calls to the Cloud Foundry instance.  One of the simplest possible operations is list all of the organizations the user is a member of.  The following example does three things:

1. Requests a list of all organizations
1. Extracts the name of each organization
1. Prints the name of each organization to `System.out`

```java
cloudFoundryOperations.organizations()
    .list()
    .map(OrganizationSummary::getName)
    .subscribe(System.out::println);
```

To relate the example to the description above the following happens:

1. `.list()` – Lists the Cloud Foundry organizations as a `Flux` of elements of type `Organization`.
1. `.map(...)` – Maps each organization to its name (type `String`).  This example uses a method reference; the equivalent lambda would look like `organizationSummary -> organizationSummary.getName()`.
1. `subscribe...` – The terminal operation that receives each name in the `Flux`.  Again, this example uses a method reference and the equivalent lambda would look like `name -> System.out.println(name)`.

### `CloudFoundryClient` APIs

As mentioned earlier, the `cloudfoundry-operations` implementation builds upon the `cloudfoundry-client` API.  That implementation takes advantage of the same reactive style in the lower-level API.  The implementation of the `Organizations.list()` method (which was demonstrated above) looks like the following (roughly):

```java
cloudFoundryClient.organizations()
    .list(ListOrganizationsRequest.builder()
        .page(1)
        .build())
    .flatMapIterable(ListOrganizationsResponse::getResources)
    .map(resource -> OrganizationSummary.builder()
        .id(resource.getMetadata().getId())
        .name(resource.getEntity().getName())
        .build());
```

The above example is more complicated:

1. `.list(...)` – Retrieves the first page of Cloud Foundry organizations.
1. `.flatMapIterable(...)` – Substitutes the original `Mono` with a `Flux` of the `Resource`s returned by the requested page.
1. `.map(...)` – Maps the `Resource` to an `OrganizationSummary` type.

## Troubleshooting

If you are having issues with the cf-java-client in your applications...

First, [read this article on debugging reactive applications](https://spring.io/blog/2019/03/28/reactor-debugging-experience) and watch this [Spring Tips Video](https://spring.io/blog/2019/05/29/spring-tips-debugging-reactor-applications) also on debugging reactive apps.

Beyond that, it is helpful to capture the following information:

1. The version of cf-java-client you are using
2. If you are using Spring Boot & if so, the version
3. A description of the problem behavior.
4. A list of things, if any, you have recently changed in your project (even if seemingly unrelated)
5. If you are getting failures with an operation or client request, capture the request and response information.
    - You may capture basic request and response information by setting the log level for `cloudfoundry-client` to `DEBUG`. For example with Spring Boot, set `logging.level.cloudfoundry-client=debug`.
    - You may perform a wire capture by setting the log level for `cloudfoundry-client.wire` to `TRACE`. For example with Spring Boot, set `logging.level.cloudfoundry-client.wire=trace`.

If you open a Github issue with a request for help, please include as much of the information above as possible and do not forget to sanitize any request/response data posted.

## Development
The project depends on Java 8. To build from source and install to your local Maven cache, run the following:

```shell
$ git submodule update --init --recursive
$ ./mvnw clean install
```

It also depends on [Immutables][i] and won't compile in IDEs like Eclipse or IntelliJ unless you also have an enabled annotation processor. See [this guide][j] for instructions on how to configure your IDE.

To run the integration tests, run the following:

```shell
$ ./mvnw -Pintegration-test clean test
```

To run a specific integration test, run the following replacing with `-Dtest=org.cloudfoundry.TestClass#test-method` (`#test-method` is optional):

```shell
./mvnw -Pintegration-test clean test -Dtest=org.cloudfoundry.client.v3.ServiceBrokersTest#update
```

To run tests & enable HTTP trace output, execute:

```shell
CLIENT_LOGGING_LEVEL=trace ./mvnw -Pintegration-test clean test
```

**IMPORTANT**
Integration tests require admin access and should be run against an empty Cloud Foundry instance. The integration tests are destructive, affecting nearly everything on an instance given the chance.

The integration tests require a running instance of Cloud Foundry to test against. To configure the integration tests with the appropriate connection information use the following environment variables:

Name | Description
---- | -----------
`TEST_ADMIN_CLIENTID` | Client ID for a client with permissions for a Client Credentials grant
`TEST_ADMIN_CLIENTSECRET` | Client secret for a client with permissions for a Client Credentials grant
`TEST_ADMIN_PASSWORD` | Password for a user with admin permissions
`TEST_ADMIN_USERNAME` | Username for a user with admin permissions
`TEST_APIHOST` | The host of a Cloud Foundry instance.  Typically something like `api.local.pcfdev.io`.
`TEST_PROXY_HOST` | _(Optional)_ The host of a proxy to route all requests through
`TEST_PROXY_PASSWORD` | _(Optional)_ The password for a proxy to route all requests through
`TEST_PROXY_PORT` | _(Optional)_ The port of a proxy to route all requests through. Defaults to `8080`.
`TEST_PROXY_USERNAME` | _(Optional)_ The username for a proxy to route all requests through
`TEST_SKIPSSLVALIDATION` | _(Optional)_ Whether to skip SSL validation when connecting to the Cloud Foundry instance.  Defaults to `false`.
`UAA_API_REQUEST_LIMIT` | _(Optional)_ If your UAA server does rate limiting and returns 429 errors, set this variable to the smallest limit configured there. Whether your server limits UAA calls is shown in the log, together with the location of the configuration file on the server. Defaults to `0` (no limit).

If you do not have access to a CloudFoundry instance with admin access, you can run one locally using [bosh-deployment](https://github.com/cloudfoundry/bosh-deployment) & [cf-deployment](https://github.com/cloudfoundry/cf-deployment/) and Virtualbox.

For instructions installing Bosh in VirtualBox using `bosh-deployment`, see the [Install Section to install Bosh](https://bosh.io/docs/bosh-lite/).

With Bosh installed, follow the [deployment guide to get CF installed](https://github.com/cloudfoundry/cf-deployment/blob/main/texts/deployment-guide.md). You can skip to step 4, since you're installing into VirtualBox. Be sure to read the entire document before you begin, however pay specific attention to [this section which has specific instructions for running locally](https://github.com/cloudfoundry/cf-deployment/blob/main/texts/deployment-guide.md#for-operators-deploying-cf-to-local-bosh-lite).

Lastly before running the tests, it is strongly recommended that you take a snapshot of the VMs in the environment. This allows for the quick rollback of the environment should the tests break something (they don't generally, integration tests should clean up after themselves).

## Contributing
[Pull requests][u] and [Issues][e] are welcome.

## License
This project is released under version 2.0 of the [Apache License][l].

[a]: https://apidocs.cloudfoundry.org/
[c]: https://github.com/cloudfoundry/cli
[e]: https://github.com/cloudfoundry/java-client/issues
[g]: https://gradle.org
[h]: https://projectreactor.io/docs/netty/milestone/reference/index.html#http-client
[i]: https://immutables.github.io/
[j]: https://immutables.github.io/apt.html
[l]: https://www.apache.org/licenses/LICENSE-2.0
[m]: https://maven.apache.org
[p]: https://projectreactor.io
[r]: http://reactivex.io
[u]: https://help.github.com/articles/using-pull-requests

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