Yandex Cloud Functions

Comparison with other Yandex Cloud services
Getting started
- Overview
- Creating a function
  - Overview
  - Node.js
  - Python
  - Go
  - PHP
  - Bash
  - Java
Step-by-step instructions
- All instructions
- Using functions to get an IAM token for a service account
- Connecting to managed databases from functions
- Getting information about a function
- Managing rights to access functions
- Creating a function
  - Creating a function
  - Creating a function version
- Invoking a function
  - Invoking a function
  - Authenticating when invoking a private function via HTTPS
- Managing functions
  - Updating a function
    - Updating a name
    - Updating a description
  - Scaling a function
  - Adding environment variables
  - Specifying a cloud network
  - Transmitting Yandex Lockbox secrets
  - Managing tags
    - Adding a tag
    - Removing a tag
  - Managing labels
  - Viewing monitoring charts
  - Managing logs
    - Viewing logs
    - Writing logs
  - Deleting a function
- Getting information about a trigger
  - Getting a list of triggers
  - Getting information about a trigger
- Creating a trigger
- Managing triggers
  - Updating a trigger
    - Updating a name
    - Updating a description
  - Managing labels
  - Viewing monitoring charts
  - Deleting a trigger
Concepts
Developing in Node.js
Developing in Python
Developing in Go
Developing in PHP
Developing in Bash
Developing in Java
Developing in R
Developing in C#
- Overview
- Programming model
- Managing dependencies
- Request handler
- Invocation context
- Logging
- Handling errors
- Using the SDK
Practical guidelines
Pricing policy
Access management
API Functions reference
API Triggers reference
- Authentication in the API
- gRPC
- REST
  - Overview
  - Trigger
Questions and answers

Go function invocation context

Written by

Invocation context is an object that is optionally accepted by the request handler. The object type is context.Context. It provides an interface for getting more information about Go function version properties:

lambdaRuntimeFunctionName: The function ID (string).
lambdaRuntimeFunctionVersion: The function version ID (string).
lambdaRuntimeMemoryLimit: The amount of memory specified when creating the function version, MB (int).
lambdaRuntimeRequestID: The ID of the request being handled (string).

To extract information from the invocation context, use its Value(key) method and pass it in the key parameter as a string with one of the keys described above.

Authentication in the Yandex Cloud API

If a function has a specified service account, you can use the SDK to obtain information that is necessary for authentication on behalf of this service account. To get this information, use the following methods:

creds := ycsdk.InstanceServiceAccount()
token, err := creds.IAMToken(ctx)

The token.IamToken field contains the required IAM token.
The code above works via the metadata service that is available in the function environment with the specified service account.

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