Go Context — TODO() vs Background() No more confusing!
In Go, the context package helps manage request-scoped values, cancellation signals, and deadlines.
Two common ways to start a context are context.TODO() and context.Background().
Though they behave similarly, they serve different purposes.
context.Background()
context.Background() is the default when you don’t need any special handling (like cancellation or deadlines).
It's often used in main, init, or when initializing operations that don't need a more specific context.
Example:
func main() {
ctx := context.Background()
server := http.Server{Addr: ":8080", BaseContext: func(net.Listener) context.Context {
return ctx
}}
log.Fatal(server.ListenAndServe())
}
In this example, context.Background() is used to establish a base context for the HTTP server.
context.TODO()
context.TODO() is a placeholder context. Use it when you're unsure of what context to provide or when planning to refactor later.
Example:
func processOrder() {
ctx := context.TODO() // Placeholder, decision on context pending
err := db.SaveOrder(ctx, orderData)
if err != nil {
log.Println("Failed to save order:", err)
}
}
Here, context.TODO() is temporarily used for a database operation until a more specific context is defined.
Key Differences
Both functions return an empty context, but they express different intentions:
- context.Background(): Used when you're confident no special context features are needed.
- context.TODO(): A temporary placeholder context, signaling future changes.
Conclusion
When to Use context.Background():
- When initializing core services like HTTP servers or database connections.
- When there's no need for cancellation, deadlines, or values.
When to Use context.TODO():
- When refactoring, and you haven’t decided on the context yet.
- When implementing early-stage code that requires future improvements.
The above is the detailed content of Go Context — TODO() vs Background() No more confusing!. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Go for Audio/Video Processing
Jul 20, 2025 am 04:14 AM
The core of audio and video processing lies in understanding the basic process and optimization methods. 1. The basic process includes acquisition, encoding, transmission, decoding and playback, and each link has technical difficulties; 2. Common problems such as audio and video aberration, lag delay, sound noise, blurred picture, etc. can be solved through synchronous adjustment, coding optimization, noise reduction module, parameter adjustment, etc.; 3. It is recommended to use FFmpeg, OpenCV, WebRTC, GStreamer and other tools to achieve functions; 4. In terms of performance management, we should pay attention to hardware acceleration, reasonable setting of resolution frame rates, control concurrency and memory leakage problems. Mastering these key points will help improve development efficiency and user experience.
Developing Kubernetes Operators in Go
Jul 25, 2025 am 02:38 AM
The most efficient way to write a KubernetesOperator is to use Go to combine Kubebuilder and controller-runtime. 1. Understand the Operator pattern: define custom resources through CRD, write a controller to listen for resource changes and perform reconciliation loops to maintain the expected state. 2. Use Kubebuilder to initialize the project and create APIs to automatically generate CRDs, controllers and configuration files. 3. Define the Spec and Status structure of CRD in api/v1/myapp_types.go, and run makemanifests to generate CRDYAML. 4. Reconcil in the controller
Go Query Optimization Techniques for PostgreSQL/MySQL
Jul 19, 2025 am 03:56 AM
TooptimizeGoapplicationsinteractingwithPostgreSQLorMySQL,focusonindexing,selectivequeries,connectionhandling,caching,andORMefficiency.1)Useproperindexing—identifyfrequentlyqueriedcolumns,addindexesselectively,andusecompositeindexesformulti-columnquer
Go OAuth2 Client and Server Implementations
Jul 16, 2025 am 02:57 AM
OAuth2 implementation is divided into client and server. The client uses the golang.org/x/oauth2 package. The steps are: 1. Introduce the package; 2. Configure the client information and build a Config object; 3. Generate an authorization link; 4. Process the callback to obtain the token; 5. Construct an HTTP client with authorization. The server takes go-oauth2/oauth2 as an example, and the process includes: 1. Initialize storage; 2. Set client information; 3. Create OAuth2 service instance; 4. Write route processing authorization and token requests. Notes include: cross-domain issues, status verification, HTTPS enabled, Token validity management, and Scope control granularity.
reading from stdin in go by example
Jul 27, 2025 am 04:15 AM
Use fmt.Scanf to read formatted input, suitable for simple structured data, but the string is cut off when encountering spaces; 2. It is recommended to use bufio.Scanner to read line by line, supports multi-line input, EOF detection and pipeline input, and can handle scanning errors; 3. Use io.ReadAll(os.Stdin) to read all inputs at once, suitable for processing large block data or file streams; 4. Real-time key response requires third-party libraries such as golang.org/x/term, and bufio is sufficient for conventional scenarios; practical suggestions: use fmt.Scan for interactive simple input, use bufio.Scanner for line input or pipeline, use io.ReadAll for large block data, and always handle
Stack vs heap allocation with pointers in Go
Jul 23, 2025 am 04:14 AM
Stack allocation is suitable for small local variables with clear life cycles, and is automatically managed, with fast speed but many restrictions; heap allocation is used for data with long or uncertain life cycles, and is flexible but has a performance cost. The Go compiler automatically determines the variable allocation position through escape analysis. If the variable may escape from the current function scope, it will be allocated to the heap. Common situations that cause escape include: returning local variable pointers, assigning values to interface types, and passing in goroutines. The escape analysis results can be viewed through -gcflags="-m". When using pointers, you should pay attention to the variable life cycle to avoid unnecessary escapes.
Go for Scientific Computing and Numerical Analysis
Jul 23, 2025 am 01:53 AM
Go language can be used for scientific calculations and numerical analysis, but it needs to be understood. The advantage lies in concurrency support and performance, which is suitable for parallel algorithms such as distributed solution, Monte Carlo simulation, etc.; community libraries such as gonum and mat64 provide basic numerical calculation functions; hybrid programming can be used to call C/C and Python through Cgo or interface to improve practicality. The limitation is that the ecosystem is not as mature as Python, the visualization and advanced tools are weaker, and some library documents are incomplete. It is recommended to select appropriate scenarios based on Go features and refer to source code examples to use them in depth.
Go for Image Manipulation Libraries
Jul 21, 2025 am 12:23 AM
Common Go image processing libraries include standard library image packages and third-party libraries, such as imaging, bimg, and imagick. 1. The image package is suitable for basic operations; 2. Imaging has a complete function and a simple API, which is suitable for most needs; 3. Bimg is based on libvips, has strong performance, which is suitable for large images or high concurrency; 4. Imagick binds ImageMagick, which is powerful but has heavy dependencies. Quickly implement image scaling and cropping. You can use the imaging library to complete it through a few lines of code in Resize and CropAnchor functions, and support multiple parameter configurations. Adding filters or adjusting tones can be achieved through the color transformation function provided by imagination, such as Graysc
