Utils

The utils package provides a collection of utility functions for common operations, covering logging, retry mechanisms, timeout control, object beautification, and numeric processing.

Modules

1. Logging and Environment Awareness

Automatically identifies development or production environments and adopts different logging methods.

import "github.com/leoheung/go-patterns/utils"

// Check if in development environment (determined by env == "dev" environment variable)
isDev := utils.IsDev()

// Log message (uses fmt.Println in dev, standard library log in prod)
utils.LogMessage("Hello, world!")

// Dev-only colored logs (outputs only when IsDev() is true)
utils.DevLogError("This is an error message")
utils.DevLogInfo("This is an info message")
utils.DevLogSuccess("This is a success message")

2. Retry and Timeout Control

Provides protection mechanisms for unstable operations.

// Retry a work function
// work: function to execute, returns (any, error)
// retryTimes: number of retries after initial failure
data, err := utils.RetryWork(func() (any, error) {
    // business logic
    return "result", nil
}, 3)

// Execution with timeout
// Returns fmt.Errorf("timeout") if timed out
res, err := utils.TimeoutWork(func() (any, error) {
    time.Sleep(2 * time.Second)
    return "done", nil
}, 1 * time.Second)

3. Object Beautification and JSON Processing

Advanced beautification tools based on go-spew.

// Formatted printing of any object (common for debugging)
utils.PPrint(myStruct)
utils.PPrettyPrint(myStruct)

// Get a pretty string representation of an object (no direct printing)
str := utils.PrettyObjStr(myStruct)

// Serialize an object to a pretty JSON string (falls back to PrettyObjStr on failure)
jsonStr := utils.JSONalizeStr(myStruct)

// Deserialize a JSON string to an object (must pass a pointer)
err := utils.DeJSONalizeStr(jsonStr, &myTarget)

4. Colored Terminal Output

// Output colored text using ANSI escape sequences
utils.PrintlnColor(utils.Red, "Red text")
utils.PrintlnColor(utils.Green, "Green text")
utils.PrintlnColor(utils.BrightBlue, "Bright blue text")

// Available color constants:
// utils.Red, utils.Green, utils.BrightBlue, utils.Magenta, utils.Cyan

5. Number Utils

Simulates numeric processing found in dynamic languages.

// Parse a string into a Number object
n, err := utils.ParseNumber("100.5")

// Get values in different types
f := n.Float()   // 100.5
i := n.Int()     // 100
i64 := n.Int64() // 100

// Check if it's an integer (no fractional part)
isUint := n.IsInteger() // false

6. Common Helpers

// Check if any value is nil (supports Interface, Slice, Map, Ptr, etc.)
isNull := utils.IsNil(someVar)

// Check if a string consists entirely of digits
allDigits := utils.IsDigits("12345")

// Delayed function execution (blocking)
utils.DelayDo(500 * time.Millisecond, func() {
    fmt.Println("Delayed execution")
})

// Block the current Goroutine indefinitely
utils.Hold()

Complete Example

package main

import (
    "fmt"
    "github.com/leoheung/go-patterns/utils"
)

func main() {
    // 1. Formatted output
    user := struct {
        Name string
        Age  int
    }{"Leon", 25}
    
    fmt.Println("User data:")
    utils.PPrint(user)

    // 2. Retry logic
    count := 0
    utils.RetryWork(func() (any, error) {
        count++
        if count < 2 {
            return nil, fmt.Errorf("temporary error")
        }
        return "Success", nil
    }, 3)
}

Features

• Robustness: Both retry and timeout functions include recover() internally to prevent business logic panics from crashing the program.
• Ease of Use: Simplifies tedious type pointer conversions and reflection checks in Go.
• Debug Friendly: Provides multiple levels of object serialization and printing tools.