Define component recipes that use stream manager Connect to stream manager in application code

Create custom components that use stream manager

Use stream manager in custom Greengrass components to store, process, and export IoT device data. Use the procedures and examples in this section to create component recipes, artifacts, and applications that work with stream manager. For more information about how to develop and test components, see Create AWS IoT Greengrass components.

Topics

Define component recipes that use stream manager
Connect to stream manager in application code

Define component recipes that use stream manager

To use stream manager in a custom component, you must define the aws.greengrass.StreamManager component as a dependency. You must also provide the Stream Manager SDK. Complete the following tasks to download and use the Stream Manager SDK in the language of your choice.

The Stream Manager SDK for Java is available as a JAR file that you can use to compile your component. Then, you can create an application JAR that includes the Stream Manager SDK, define the application JAR as a component artifact, and run the application JAR in the component lifecycle.

To use the Stream Manager SDK for Java

Download the Stream Manager SDK for Java JAR file.

Do one of the following to create component artifacts from your Java application and the Stream Manager SDK JAR file:

Build your application as a JAR file that includes the Stream Manager SDK JAR, and run this JAR file in your component recipe.
Define the Stream Manager SDK JAR as a component artifact. Add that artifact to the classpath when you run your application in your component recipe.

Your component recipe might look like the following example. This component runs a modified version of the StreamManagerS3.java example, where StreamManagerS3.jar includes the Stream Manager SDK JAR.

For more information about how to develop and test components, see Create AWS IoT Greengrass components.

The Stream Manager SDK for Python is available as source code that you can include in your component. Create a ZIP file of the Stream Manager SDK, define the ZIP file as a component artifact, and install the SDK's requirements in the component lifecycle.

To use the Stream Manager SDK for Python

Clone or download the aws-greengrass-stream-manager-sdk-python repository.


git clone git@github.com:aws-greengrass/aws-greengrass-stream-manager-sdk-python.git

Create a ZIP file that contains the stream_manager folder, which contains the source code of the Stream Manager SDK for Python. You can provide this ZIP file as a component artifact that the AWS IoT Greengrass Core software unzips when it installs your component. Do the following:

Open the folder that contains the repository that you cloned or downloaded in the previous step.
```
cd aws-greengrass-stream-manager-sdk-python
```

Zip the stream_manager folder into a ZIP file named stream_manager_sdk.zip.

Verify that the stream_manager_sdk.zip file contains the stream_manager folder and its contents. Run the following command to list the contents of the ZIP file.

The output should look similar to the following.


Archive:  aws-greengrass-stream-manager-sdk-python/stream_manager.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
        0  02-24-2021 20:45   stream_manager/
      913  02-24-2021 20:45   stream_manager/__init__.py
     9719  02-24-2021 20:45   stream_manager/utilinternal.py
     1412  02-24-2021 20:45   stream_manager/exceptions.py
     1004  02-24-2021 20:45   stream_manager/util.py
        0  02-24-2021 20:45   stream_manager/data/
   254463  02-24-2021 20:45   stream_manager/data/__init__.py
    26515  02-24-2021 20:45   stream_manager/streammanagerclient.py
---------                     -------
   294026                     8 files

Copy the Stream Manager SDK artifacts to your component's artifacts folder. In addition to the Stream Manager SDK ZIP file, your component uses the SDK's requirements.txt file to install the dependencies of the Stream Manager SDK. Replace ~/greengrass-components with the path to the folder that you use for local development.

Create your component recipe. In the recipe, do the following:

Define stream_manager_sdk.zip and requirements.txt as artifacts.
Define your Python application as an artifact.
In the install lifecycle, install the Stream Manager SDK requirements from requirements.txt.
In the run lifecycle, append the Stream Manager SDK to PYTHONPATH, and run your Python application.

Your component recipe might look like the following example. This component runs the stream_manager_s3.py example.

JSON


{
  "RecipeFormatVersion": "2020-01-25",
  "ComponentName": "com.example.StreamManagerS3Python",
  "ComponentVersion": "1.0.0",
  "ComponentDescription": "Uses stream manager to upload a file to an S3 bucket.",
  "ComponentPublisher": "Amazon",
  "ComponentDependencies": {
    "aws.greengrass.StreamManager": {
      "VersionRequirement": "^2.0.0"
    }
  },
  "Manifests": [
    {
      "Platform": {
        "os": "linux"
      },
      "Lifecycle": {
        "install": "pip3 install --user -r {artifacts:path}/requirements.txt",
        "Run": "export PYTHONPATH=$PYTHONPATH:{artifacts:decompressedPath}/stream_manager_sdk; python3 {artifacts:path}/stream_manager_s3.py"
      },
      "Artifacts": [
        {
          "URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/stream_manager_sdk.zip",
          "Unarchive": "ZIP"
        },
        {
          "URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/stream_manager_s3.py"
        },
        {
          "URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/requirements.txt"
        }
      ]
    },
    {
      "Platform": {
        "os": "windows"
      },
      "Lifecycle": {
        "install": "pip3 install --user -r {artifacts:path}/requirements.txt",
        "Run": "set \"PYTHONPATH=%PYTHONPATH%;{artifacts:decompressedPath}/stream_manager_sdk\" & py -3 {artifacts:path}/stream_manager_s3.py"
      },
      "Artifacts": [
        {
          "URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/stream_manager_sdk.zip",
          "Unarchive": "ZIP"
        },
        {
          "URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/stream_manager_s3.py"
        },
        {
          "URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/requirements.txt"
        }
      ]
    }
  ]
}

YAML


---
RecipeFormatVersion: '2020-01-25'
ComponentName: com.example.StreamManagerS3Python
ComponentVersion: 1.0.0
ComponentDescription: Uses stream manager to upload a file to an S3 bucket.
ComponentPublisher: Amazon
ComponentDependencies:
  aws.greengrass.StreamManager:
    VersionRequirement: "^2.0.0"
Manifests:
  - Platform:
      os: linux
    Lifecycle:
      install: pip3 install --user -r {artifacts:path}/requirements.txt
      Run: |
        export PYTHONPATH=$PYTHONPATH:{artifacts:decompressedPath}/stream_manager_sdk
        python3 {artifacts:path}/stream_manager_s3.py
    Artifacts:
      - URI: s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/stream_manager_sdk.zip
        Unarchive: ZIP
      - URI: s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/stream_manager_s3.py
      - URI: s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/requirements.txt
  - Platform:
      os: windows
    Lifecycle:
      install: pip3 install --user -r {artifacts:path}/requirements.txt
      Run: |
        set "PYTHONPATH=%PYTHONPATH%;{artifacts:decompressedPath}/stream_manager_sdk"
        py -3 {artifacts:path}/stream_manager_s3.py
    Artifacts:
      - URI: s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/stream_manager_sdk.zip
        Unarchive: ZIP
      - URI: s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/stream_manager_s3.py
      - URI: s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Python/1.0.0/requirements.txt

For more information about how to develop and test components, see Create AWS IoT Greengrass components.

The Stream Manager SDK for JavaScript is available as source code that you can include in your component. Create a ZIP file of the Stream Manager SDK, define the ZIP file as a component artifact, and install the SDK in the component lifecycle.

To use the Stream Manager SDK for JavaScript

Clone or download the aws-greengrass-stream-manager-sdk-js repository.


git clone git@github.com:aws-greengrass/aws-greengrass-stream-manager-sdk-js.git

Create a ZIP file that contains the aws-greengrass-stream-manager-sdk folder, which contains the source code of the Stream Manager SDK for JavaScript. You can provide this ZIP file as a component artifact that the AWS IoT Greengrass Core software unzips when it installs your component. Do the following:

Open the folder that contains the repository that you cloned or downloaded in the previous step.
```
cd aws-greengrass-stream-manager-sdk-js
```

Zip the aws-greengrass-stream-manager-sdk folder into a ZIP file named stream-manager-sdk.zip.

Verify that the stream-manager-sdk.zip file contains the aws-greengrass-stream-manager-sdk folder and its contents. Run the following command to list the contents of the ZIP file.

The output should look similar to the following.


Archive:  stream-manager-sdk.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
        0  02-24-2021 22:36   aws-greengrass-stream-manager-sdk/
      369  02-24-2021 22:36   aws-greengrass-stream-manager-sdk/package.json
     1017  02-24-2021 22:36   aws-greengrass-stream-manager-sdk/util.js
     8374  02-24-2021 22:36   aws-greengrass-stream-manager-sdk/utilInternal.js
     1937  02-24-2021 22:36   aws-greengrass-stream-manager-sdk/exceptions.js
        0  02-24-2021 22:36   aws-greengrass-stream-manager-sdk/data/
   353343  02-24-2021 22:36   aws-greengrass-stream-manager-sdk/data/index.js
    22599  02-24-2021 22:36   aws-greengrass-stream-manager-sdk/client.js
      216  02-24-2021 22:36   aws-greengrass-stream-manager-sdk/index.js
---------                     -------
   387855                     9 files

Copy the Stream Manager SDK artifact to your component's artifacts folder. Replace ~/greengrass-components with the path to the folder that you use for local development.

Create your component recipe. In the recipe, do the following:

Define stream-manager-sdk.zip as an artifact.
Define your JavaScript application as an artifact.
In the install lifecycle, install the Stream Manager SDK from the stream-manager-sdk.zip artifact. This npm install command creates a node_modules folder that contains the Stream Manager SDK and its dependencies.
In the run lifecycle, append the node_modules folder to NODE_PATH, and run your JavaScript application.

Your component recipe might look like the following example. This component runs the StreamManagerS3 example.

JSON


{
  "RecipeFormatVersion": "2020-01-25",
  "ComponentName": "com.example.StreamManagerS3JS",
  "ComponentVersion": "1.0.0",
  "ComponentDescription": "Uses stream manager to upload a file to an S3 bucket.",
  "ComponentPublisher": "Amazon",
  "ComponentDependencies": {
    "aws.greengrass.StreamManager": {
      "VersionRequirement": "^2.0.0"
    }
  },
  "Manifests": [
    {
      "Platform": {
        "os": "linux"
      },
      "Lifecycle": {
        "install": "npm install {artifacts:decompressedPath}/stream-manager-sdk/aws-greengrass-stream-manager-sdk",
        "Run": "export NODE_PATH=$NODE_PATH:{work:path}/node_modules; node {artifacts:path}/index.js"
      },
      "Artifacts": [
        {
          "URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3JS/1.0.0/stream-manager-sdk.zip",
          "Unarchive": "ZIP"
        },
        {
          "URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3JS/1.0.0/index.js"
        }
      ]
    },
    {
      "Platform": {
        "os": "windows"
      },
      "Lifecycle": {
        "install": "npm install {artifacts:decompressedPath}/stream-manager-sdk/aws-greengrass-stream-manager-sdk",
        "Run": "set \"NODE_PATH=%NODE_PATH%;{work:path}/node_modules\" & node {artifacts:path}/index.js"
      },
      "Artifacts": [
        {
          "URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3JS/1.0.0/stream-manager-sdk.zip",
          "Unarchive": "ZIP"
        },
        {
          "URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3JS/1.0.0/index.js"
        }
      ]
    }
  ]
}

YAML


---
RecipeFormatVersion: '2020-01-25'
ComponentName: com.example.StreamManagerS3JS
ComponentVersion: 1.0.0
ComponentDescription: Uses stream manager to upload a file to an S3 bucket.
ComponentPublisher: Amazon
ComponentDependencies:
  aws.greengrass.StreamManager:
    VersionRequirement: "^2.0.0"
Manifests:
  - Platform:
      os: linux
    Lifecycle:
      install: npm install {artifacts:decompressedPath}/stream-manager-sdk/aws-greengrass-stream-manager-sdk
      Run: |
        export NODE_PATH=$NODE_PATH:{work:path}/node_modules
        node {artifacts:path}/index.js
    Artifacts:
      - URI: s3://DOC-EXAMPLE-BUCKET/artifacts/com.example.StreamManagerS3JS/1.0.0/stream-manager-sdk.zip
        Unarchive: ZIP
      - URI: s3://DOC-EXAMPLE-BUCKET/artifacts/com.example.StreamManagerS3JS/1.0.0/index.js
  - Platform:
      os: windows
    Lifecycle:
      install: npm install {artifacts:decompressedPath}/stream-manager-sdk/aws-greengrass-stream-manager-sdk
      Run: |
        set "NODE_PATH=%NODE_PATH%;{work:path}/node_modules"
        node {artifacts:path}/index.js
    Artifacts:
      - URI: s3://DOC-EXAMPLE-BUCKET/artifacts/com.example.StreamManagerS3JS/1.0.0/stream-manager-sdk.zip
        Unarchive: ZIP
      - URI: s3://DOC-EXAMPLE-BUCKET/artifacts/com.example.StreamManagerS3JS/1.0.0/index.js

For more information about how to develop and test components, see Create AWS IoT Greengrass components.

Connect to stream manager in application code

To connect to stream manager in your application, create an instance of StreamManagerClient from the Stream Manager SDK. This client connects to the stream manager component on its default port 8088, or the port that you specify. For more information about how to use StreamManagerClient after you create an instance, see Use StreamManagerClient to work with streams.

Example: Connect to stream manager with default port

Example: Connect to stream manager with non-default port

If you configure stream manager with a port other than the default, you must use interprocess communication to retrieve the port from the component configuration.

Note

The port configuration parameter contains the value that you specify in STREAM_MANAGER_SERVER_PORT when you deploy stream manager.

Java


void connectToStreamManagerWithCustomPort() {
    EventStreamRPCConnection eventStreamRpcConnection = IPCUtils.getEventStreamRpcConnection();
    GreengrassCoreIPCClient greengrassCoreIPCClient = new GreengrassCoreIPCClient(eventStreamRpcConnection);
    List<String> keyPath = new ArrayList<>();
    keyPath.add("port");

    GetConfigurationRequest request = new GetConfigurationRequest();
    request.setComponentName("aws.greengrass.StreamManager");
    request.setKeyPath(keyPath);
    GetConfigurationResponse response =
            greengrassCoreIPCClient.getConfiguration(request, Optional.empty()).getResponse().get();
    String port = response.getValue().get("port").toString();
    System.out.print("Stream Manager is running on port: " + port);

    final StreamManagerClientConfig config = StreamManagerClientConfig.builder()
            .serverInfo(StreamManagerServerInfo.builder().port(Integer.parseInt(port)).build()).build();

    StreamManagerClient client = StreamManagerClientFactory.standard().withClientConfig(config).build();
    
    // Use the client.
}

Python


import awsiot.greengrasscoreipc
from awsiot.greengrasscoreipc.model import (
    GetConfigurationRequest
)
from stream_manager import (
    StreamManagerClient
)

TIMEOUT = 10

def connect_to_stream_manager_with_custom_port():
    # Use IPC to get the port from the stream manager component configuration.
    ipc_client = awsiot.greengrasscoreipc.connect()
    request = GetConfigurationRequest()
    request.component_name = "aws.greengrass.StreamManager"
    request.key_path = ["port"]
    operation = ipc_client.new_get_configuration()
    operation.activate(request)
    future_response = operation.get_response()
    response = future_response.result(TIMEOUT)
    stream_manager_port = str(response.value["port"])
    
    # Use port to create a stream manager client.
    stream_client = StreamManagerClient(port=stream_manager_port)
    
    # Use the client.

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Document Conventions

Configure stream manager

Use StreamManagerClient to work with streams