Amazon Web Services 文档中描述的 Amazon Web Services 服务或功能可能因区域而异。要查看适用于中国区域的差异，请参阅
中国的 Amazon Web Services 服务入门
(PDF)。
本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。
创建使用流管理器的自定义组件
在自定义 Greengrass 组件中使用流管理器来存储、处理和导出 IoT 设备数据。使用本节中的程序和示例来创建与流管理器配合使用的组件配方、构件和应用程序。有关如何开发和测试组件的更多信息，请参阅创建 Amazon IoT Greengrass 组件。
定义使用流管理器的组件配方
要在自定义组件中使用流管理器，您必须将该 aws.greengrass.StreamManager 组件定义为依赖关系。您还须提供流管理器 SDK。完成以下任务，以您所选的语言下载并使用流管理器 SDK。
适用于 Java 的流管理器 SDK 以 JAR 文件形式提供，您可以用它来编译组件。然后，您可以创建包含流管理器 SDK 的应用程序 JAR，将应用程序 JAR 定义为组件构件，并在组件生命周期中运行应用程序 JAR。
使用适用于 Java 的流管理器 SDK
-
下载适用于 Java 的流管理器 SDK JAR 文件。
-
执行以下任一操作，从 Java 应用程序和流管理器 SDK JAR 文件创建组件构件：
您的组件配方可能类似于以下示例。此组件运行 StreamManagerS3.java 示例的修改版本，其中StreamManagerS3.jar包括 Stream Manager SDK JAR。
- JSON
-
{
"RecipeFormatVersion": "2020-01-25",
"ComponentName": "com.example.StreamManagerS3Java",
"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": [
{
"Lifecycle": {
"Run": "java -jar {artifacts:path}/StreamManagerS3.jar"
},
"Artifacts": [
{
"URI": "s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Java/1.0.0/StreamManagerS3.jar"
}
]
}
]
}
- YAML
-
---
RecipeFormatVersion: '2020-01-25'
ComponentName: com.example.StreamManagerS3Java
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:
- Lifecycle:
Run: java -jar {artifacts:path}/StreamManagerS3.jar
Artifacts:
- URI: s3://amzn-s3-demo-bucket/artifacts/com.example.StreamManagerS3Java/1.0.0/StreamManagerS3.jar
有关如何开发和测试组件的更多信息，请参阅创建 Amazon IoT Greengrass 组件。
适用于 Python 的流管理器 SDK 以源代码形式提供，您可以将其包含在组件中。创建流管理器 SDK 的 ZIP 文件，将该 ZIP 文件定义为组件构件，然后在组件生命周期中安装 SDK 的要求。
使用适用于 Python 的流管理器 SDK
-
克隆或下载 aws-greengrass-stream-manager-sdk- python 存储库。
git clone git@github.com:aws-greengrass/aws-greengrass-stream-manager-sdk-python.git
-
创建包含 stream_manager 文件夹的 ZIP 文件，其中包含适用于 Python 的流管理器 SDK 的源代码。您可以将此 ZIP 文件作为组件工件提供， Amazon IoT Greengrass Core 软件在安装您的组件时会将其解压缩。执行以下操作：
-
打开包含您在上一个步骤中克隆或下载的存储库的文件夹。
cd aws-greengrass-stream-manager-sdk-python
-
将 stream_manager 文件夹压缩到名为 stream_manager_sdk.zip 的 ZIP 文件中。
- Linux or Unix
-
zip -rv stream_manager_sdk.zip stream_manager
- Windows Command Prompt (CMD)
-
tar -acvf stream_manager_sdk.zip stream_manager
- PowerShell
-
Compress-Archive stream_manager stream_manager_sdk.zip
-
确认该 stream_manager_sdk.zip 文件包含 stream_manager 文件夹及其内容。运行以下命令以列出 ZIP 文件的内容。
- Linux or Unix
-
unzip -l stream_manager_sdk.zip
- Windows Command Prompt (CMD)
-
tar -tf stream_manager_sdk.zip
输出应类似于以下内容。
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
-
将流管理器 SDK 构件复制到组件的构件文件夹。除了流管理器 SDK ZIP 文件外，您的组件还使用该 SDK 的 requirements.txt 文件来安装流管理器 SDK 的依赖关系。~/greengrass-components替换为用于本地开发的文件夹的路径。
- Linux or Unix
-
cp {stream_manager_sdk.zip,requirements.txt} ~/greengrass-components/artifacts/com.example.StreamManagerS3Python/1.0.0/
- Windows Command Prompt (CMD)
-
robocopy . %USERPROFILE%\greengrass-components\artifacts\com.example.StreamManagerS3Python\1.0.0 stream_manager_sdk.zip
robocopy . %USERPROFILE%\greengrass-components\artifacts\com.example.StreamManagerS3Python\1.0.0 requirements.txt
- PowerShell
-
cp .\stream_manager_sdk.zip,.\requirements.txt ~\greengrass-components\artifacts\com.example.StreamManagerS3Python\1.0.0\
-
创建您的组件配方。在配方中，执行以下操作：
-
将 stream_manager_sdk.zip 和 requirements.txt 定义为构件。
-
将您的 Python 应用程序定义为构件。
-
在安装生命周期中，安装来自 requirements.txt 的流管理器 SDK 要求。
-
在运行生命周期中，将流管理器 SDK 附加到 PYTHONPATH 并运行您的 Python 应用程序。
您的组件配方可能类似于以下示例。此组件运行 stream_manager_s3.py 示例。
- 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
有关如何开发和测试组件的更多信息，请参阅创建 Amazon IoT Greengrass 组件。
的 Stream Manager SDK 以 JavaScript 源代码形式提供，您可以将其包含在组件中。创建流管理器 SDK 的 ZIP 文件，将该 ZIP 文件定义为组件构件，然后在组件生命周期中安装 SDK。
要将直播管理器 SDK 用于 JavaScript
-
克隆或下载 aws-greengrass-stream-manager-sdk-js 存储库。
git clone git@github.com:aws-greengrass/aws-greengrass-stream-manager-sdk-js.git
-
创建包含该aws-greengrass-stream-manager-sdk文件夹的 ZIP 文件，其中包含流管理器 SDK 的源代码 JavaScript。您可以将此 ZIP 文件作为组件工件提供， Amazon IoT Greengrass Core 软件在安装您的组件时会将其解压缩。执行以下操作：
-
打开包含您在上一个步骤中克隆或下载的存储库的文件夹。
cd aws-greengrass-stream-manager-sdk-js
-
将 aws-greengrass-stream-manager-sdk 文件夹压缩到名为 stream-manager-sdk.zip 的 ZIP 文件中。
- Linux or Unix
-
zip -rv stream-manager-sdk.zip aws-greengrass-stream-manager-sdk
- Windows Command Prompt (CMD)
-
tar -acvf stream-manager-sdk.zip aws-greengrass-stream-manager-sdk
- PowerShell
-
Compress-Archive aws-greengrass-stream-manager-sdk stream-manager-sdk.zip
-
确认该 stream-manager-sdk.zip 文件包含 aws-greengrass-stream-manager-sdk 文件夹及其内容。运行以下命令以列出 ZIP 文件的内容。
- Linux or Unix
-
unzip -l stream-manager-sdk.zip
- Windows Command Prompt (CMD)
-
tar -tf stream-manager-sdk.zip
输出应类似于以下内容。
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
-
将流管理器 SDK 构件复制到组件的构件文件夹。~/greengrass-components替换为用于本地开发的文件夹的路径。
- Linux or Unix
-
cp stream-manager-sdk.zip ~/greengrass-components/artifacts/com.example.StreamManagerS3JS/1.0.0/
- Windows Command Prompt (CMD)
-
robocopy . %USERPROFILE%\greengrass-components\artifacts\com.example.StreamManagerS3JS\1.0.0 stream-manager-sdk.zip
- PowerShell
-
cp .\stream-manager-sdk.zip ~\greengrass-components\artifacts\com.example.StreamManagerS3JS\1.0.0\
-
创建您的组件配方。在配方中，执行以下操作：
-
将 stream-manager-sdk.zip 定义为构件。
-
将您的 JavaScript 应用程序定义为工件。
-
在安装生命周期中，从 stream-manager-sdk.zip 构件安装流管理器 SDK。此 npm
install 命令会创建一个包含流管理器 SDK 及其依赖关系的 node_modules 文件夹。
-
在运行生命周期中，将node_modules文件夹追加到NODE_PATH并运行您的 JavaScript 应用程序。
您的组件配方可能类似于以下示例。此组件运行 S StreamManager3 示例。
- 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
有关如何开发和测试组件的更多信息，请参阅创建 Amazon IoT Greengrass 组件。
在应用程序代码中连接至流管理器
要在应用程序中连接至流管理器，请从流管理器 SDK 创建一个 StreamManagerClient 实例。此客户端通过其默认端口 8088 或您指定的端口连接至流管理器组件。有关创建实例后如何使用 StreamManagerClient 的更多信息，请参阅 StreamManagerClient 用于处理直播。
例 示例：使用默认端口连接至流管理器
- Java
-
import com.amazonaws.greengrass.streammanager.client.StreamManagerClient;
public class MyStreamManagerComponent {
void connectToStreamManagerWithDefaultPort() {
StreamManagerClient client = StreamManagerClientFactory.standard().build();
// Use the client.
}
}
- Python
-
from stream_manager import (
StreamManagerClient
)
def connect_to_stream_manager_with_default_port():
client = StreamManagerClient()
# Use the client.
- JavaScript
-
const {
StreamManagerClient
} = require('aws-greengrass-stream-manager-sdk');
function connectToStreamManagerWithDefaultPort() {
const client = new StreamManagerClient();
// Use the client.
}
例 示例：使用非默认端口连接至流管理器
如果您为流管理器配置了非默认端口，则必须使用进程间通信从组件配置中检索该端口。
port 配置参数包含您部署流管理器时在 STREAM_MANAGER_SERVER_PORT 中指定的值。
- 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.