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Table of contents
1.
Introduction
2.
Cloud Debugger API
2.1.
Protocols
2.2.
Authorization
2.3.
Service: clouddebugger.googleapis.com
2.3.1.
Discovery document
2.4.
REST Resource: v2.controller.debuggees
2.5.
REST Resource: v2.controller.debuggees.breakpoints
2.6.
REST Resource: v2.debugger.debuggees
2.7.
REST Resource: v2.debugger.debuggees.breakpoints
2.8.
Service: clouddebugger.googleapis.com
2.8.1.
google.devtools.cloddebugger.v2.Controller2
2.8.2.
google.devtools.cloddebugger.v2.Debugger2
3.
gcloud debug
3.1.
NAME
3.2.
SYNOPSIS
3.3.
DESCRIPTION
3.4.
Example
3.5.
GCLOUD WIDE FLAGS
3.6.
GROUPS
4.
Concepts
4.1.
Client roles
4.1.1.
Agents
4.1.2.
Debugger Clients
4.2.
Data model
4.2.1.
Debuggees
4.2.2.
Breakpoints
4.2.3.
Source locations
4.2.4.
Status messages
4.2.5.
Agent operations
5.
Frequently Asked Questions
5.1.
Mention the protocols which Cloud Debugger API supports.
5.2.
What is used by the Cloud Debugger API for user authorization?
5.3.
What are the uses of the discovery document?
6.
Conclusion
Last Updated: Mar 27, 2024

Advanced Concepts of Cloud Debugger

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Introduction

Cloud Debugger is also known as Stackdriver Debugger. It lets the user inspect the state of a running cloud application at any code location without stopping or slowing it down. It's safe for use with the production apps. When a debug snapshot is captured by the Java debugger agent, it adds less than 10ms to the request latency. This blog will discuss the advanced concepts that are used in Cloud Debugger.

Must Recommended Topic, Types of Agents in Artificial Intelligence.

Cloud Debugger API

It allows the application to interact with the backend of the Google Cloud Debugger. It provides two different interfaces: The Debugger Interface and The Controller Interface. The debugger interface allows the user to implement a cloud debugger client that gives the user the ability to set and delete breakpoints at which the state data is collected, as well as read the data that is captured. Whereas the controller interface allows the user to implement an agent that sends state data.

Protocols

The following mentioned protocols are supported by the cloud debugger API:

  • REST: It allows the user to interact with the backend of the Cloud Debugger using JSON over HTTP.
  • RPC: It allows the user to interact with the backends using gRPC. At the moment, this API doesn't provide any gRPC client libraries. 

Authorization

OAuth 2.0 is used by the Cloud Debugger API for user authorization. As a result of which, the user must set up web application credentials in the Google Cloud console for the project and, similarly, implement an OAuth 2.0 authorization flow in the client application in order to use the API.

Service: clouddebugger.googleapis.com

If the user wishes to call this service, then it is recommended to use Google-provided client libraries. If the application needs to use its own libraries to call this service, then use the below-mentioned information when an API request is made.

Discovery document

It is a machine-readable specification that is used for describing as well as consuming REST APIs. It is also used to build client libraries, IDE plugins, and many other tools that are used to interact with the Google APIs. It is possible that one service may provide multiple discovery documents. The service mentioned above provides the below-mentioned discovery document.
https://clouddebugger.googleapis.com/$discovery/rest?version=v2

Service endpoint

It is a baseless URL that tells the network address of the API service. It is possible for a service to have multiple service endpoints. The service mentioned above has the below-mentioned service endpoint, and all the relative URLs to this endpoint are mentioned below:
https://clouddebugger.googleapis.com

REST Resource: v2.controller.debuggees

table for REST Resource: v2.controller.debuggees

REST Resource: v2.controller.debuggees.breakpoints

table for REST Resource: v2.controller.debuggees.breakpoints

REST Resource: v2.debugger.debuggees

table for REST Resource: v2.debugger.debuggees

REST Resource: v2.debugger.debuggees.breakpoints

table for REST Resource: v2.debugger.debuggees.breakpoints

Service: clouddebugger.googleapis.com

A service known as clouddebugger.googleapis.com is required to create a RPC client stubs.

google.devtools.cloddebugger.v2.Controller2

google.devtools.cloddebugger.v2.Controller2

google.devtools.cloddebugger.v2.Debugger2

google.devtools.cloddebugger.v2.Debugger2

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gcloud debug

NAME

The gcloud debug - commands are mainly used for interacting with the Cloud Debugger.

SYNOPSIS

glcoud debug GROUP {GLOUD_WIDE_FLAG}

DESCRIPTION

It allows the user to interact with the cloud debugger as well as allows the user to list and manipulate debugging targets, snapshots, and logpoints. One of the features of Google Cloud is a cloud debugger. It lets the user inspect the state of an application anywhere inside the code without using logging statements and without having to stop or slow the application.

Example

Run the below-mentioned command to view all of the available debug targets:

$ gcloud debug targets list
NAME           ID             DESCRIPTION
default-test   gcp:1234:5678  myproject-test-9876543
default-test2  gcp:9012:3456  myproject-test2-1234567

GCLOUD WIDE FLAGS

All the commands have these flags: –help

Run the below-mentioned command to get the details

$ gcloud help

GROUPS

table for groups in gcloud wide flags

Concepts

Client roles

There are two roles that are defined by the API:

Agents

It is a program that runs on the same system as the debuggee application. Its responsibilities include sending state data like the value of program variables and call stack to the cloud debugger whenever the code at the breakpoint location is executed.

It is possible to have multiple agents per debugger.

Debugger Clients

It is an application that allows the user to set as well as remove the breakpoints. It also allows the user to view the state data that is captured at a breakpoint. Cloud debugger is an example of a debugger client. 

Data model

The API data model provides different types of state data as well as entities for debuggees and breakpoints that an agent collects when code at a breakpoint location is executed.

Debuggees

It is an application that a user wants to debug. All of the tasks that comprise an application are considered to be the same debuggee and share the same debuggee ID. Whereas different versions of the application are considered to be different debuggees.

Breakpoints

It is an entity that provides the agent with information about where and when to collect the state data about an application. It also stores the state data itself.

A breakpoint specifies the below-mentioned:

  • Location in the debuggee source code.
  • The conditional expression used by the agent to determine when to collect the state data.
  • Expressions to determine when to collect data.

When the state data is collected from the debuggee, it can include the following:

  • Value of program variables.
  • Call stack
  • Value of already evaluated expressions.

Source locations

It defines a point in the target application in the form of file path and line number.

Variables

It contains the contents of a program object when the state data is collected by the agent. 

Status messages

It is used to provide state information about the state of the breakpoints and variables.

Agent operations

Agents are allowed to perform the below-mentioned operations by the controller interface:

table for agent operations

The general order of operations for an agent is mentioned-below:

  • The agent registers it as a debuggee using either register or RegisterDebugger method whenever the application starts.
  • The agent calls either the list or ListActiveBreakpoints at intervals to retrieve the currently set breakpoints.
  • The agent collects the data whenever the application reaches the code location where a breakpoint is set.

Frequently Asked Questions

Mention the protocols which Cloud Debugger API supports.

The cloud debugger API supports REST and RPC protocols.

What is used by the Cloud Debugger API for user authorization?

The cloud debugger API uses OAuth 2.0 for user authorization.

What are the uses of the discovery document?

A discovery document can be used for building client libraries, IDE plugins, and tools that can interact with the Google APIs.

Conclusion

In this article, we have extensively discussed the advanced level concepts of Cloud Debugger.

After reading about the advanced level concepts of Cloud Debugger,  are you not feeling excited to read/explore more articles on Google Cloud? Don't worry; Coding Ninjas has you covered. To learn about GCP certification: Google Cloud Platform, the difference between AWS, Azure & Google Cloud, and which platform is best: AWS vs. Google Cloud.

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