在物联网边缘模块中传递环境变量

Question

我正在为我的Linux设备构建一个微软IoT边缘python模块。我必须从我的deployment.template.json文件中访问python模块中的环境变量。该文件显示了环境变量如何从环境传递到模块。问题是如何在代码中访问它们。

deployment.template.json文件：

  "$schema-template": "2.0.0",
  "modulesContent": {
    "$edgeAgent": {
      "properties.desired": {
        "schemaVersion": "1.0",
        "runtime": {
          "type": "docker",
          "settings": {
            "minDockerVersion": "v1.25",
            "loggingOptions": "",
            "registryCredentials": {
              "myRegistryName": {
                "username": "$CONTAINER_REGISTRY_USERNAME",
                "password": "$CONTAINER_REGISTRY_PASSWORD",
                "address": "myRegistryAddress.azurecr.io"
              }
            }
          }
        },
        "systemModules": {
          "edgeAgent": {
            "type": "docker",
            "settings": {
              "image": "mcr.microsoft.com/azureiotedge-agent:1.0",
              "createOptions": {}
            }
          },
          "edgeHub": {
            "type": "docker",
            "status": "running",
            "restartPolicy": "always",
            "settings": {
              "image": "mcr.microsoft.com/azureiotedge-hub:1.0",
              "createOptions": {
                "HostConfig": {
                  "PortBindings": {
                    "5671/tcp": [
                      {
                        "HostPort": "5671"
                      }
                    ],
                    "8883/tcp": [
                      {
                        "HostPort": "8883"
                      }
                    ],
                    "443/tcp": [
                      {
                        "HostPort": "443"
                      }
                    ]
                  }
                }
              }
            }
          }
        },
        "modules": {
          "Module_Name": {
            "version": "1.0",
            "type": "docker",
            "status": "running",
            "restartPolicy": "always",
            "settings": {
              "image": "${MODULES.Module_Name}",
              "createOptions": {}
            },
            "env": {
              "test_var": {
                "value": "secret"
              }
            }
          }
        }
      }
    },
    "$edgeHub": {
      "properties.desired": {
        "schemaVersion": "1.0",
        "routes": {
          "route": "FROM /messages/* INTO $upstream"
        },
        "storeAndForwardConfiguration": {
          "timeToLiveSecs": 7200
        }
      }
    }
  }
}

如何访问python代码模块中的环境test_var变量？

Answer 1

os.environ应该拥有它。

有点像

import os
os.environ['test_var']

Answer 2

首先需要构建IoT边缘解决方案，以便在VS代码中使用Generate IoT Edge Deployment Manifest访问变量，然后在模拟器中运行解决方案。我的代码显示了如何访问变量。

def main(protocol):
    try:
        print ( "\nPython %s\n" % sys.version )
        print ( "Module client" )

        hub_manager = HubManager(protocol)
        os.environ['test_var'] // prints secret i.e. value of the variable itself


    except IoTHubError as iothub_error:
        print ( "Unexpected error %s from IoTHub" % iothub_error )
        return
    except KeyboardInterrupt:
        print ( "client stopped" )

if __name__ == '__main__':
    main(PROTOCOL)```

Answer 3

用于.Net C# / .Net核心

string environmentValue = Environment.GetEnvironmentVariable("environment-name");