Golang

If you search Cors error, you can find tons of answers. But most of them are not clear enough to understand, especially you are new to web development. So I will explain what is Cors error and how to fix it in Golang. 1. What is Cors? CORS stands for Cross-Origin Resource Sharing. It is a security feature implemented by web browsers to control how web pages in one domain can request and interact with resources hosted on another domain. ...

Let’s consider a situation where there are multiple folders located under a specific path, and we only have the names of a few folders that we want to retain while removing the rest. For instance, the folder structure is presented below, with all entries being folders: ├── 123123 ├── 123456 ├── 123678 ├── 123789 ├── target-folder-1 └── target-folder-2 To tackle this scenario, we can approach it in two logical ways: Firstly, we can move the known folders to a different folder at the same level as the target path, as a temporary measure. Then, we can delete the target path and rename the temporary folder to match the path name. Alternatively, we can traverse through the target path and eliminate all folders except those we intend to keep. In this post, I will demonstrate how to implement the second method using Golang. ...

Problem If you use ent with sqlite3 driver in your Golang project, you may encounter the following error when you try to insert a new record to the table. insert nodes to table "users": near "RETURNING": syntax error Analysis The error message indicates that the sqlite3 driver does not support the RETURNING clause. If you are using Golang sqlite3 package github.com/mattn/go-sqlite3 in your project. The issue may be caused by the version of the package. ...

Introduction If you are rocking VSCode as your IDE for Golang development and haven’t installed the debugger, I would recommend you to do it now. And Don’t worry, I’ve got your back. In this friendly guide, I’m going to walk you through the process of setting up and configuring the Golang debugger in VSCode. Step by step guide 1. Install the Debugger for Golang Delve, a fantastic open-source project, is your go-to debugging companion for Golang in VSCode. This powerful tool works like a charm on Linux, macOS, Windows, and FreeBSD. For this guide, we’ll focus on Windows, but the steps remain consistent across other platforms ...

Let’s dive into an exciting scenario to explore how we can jazz up our Golang code with a cool timeout feature! Imagine this: you’re building an awesome application and you want to delegate a task to a third-party API. But here’s the catch - the processing time for this task is unpredictable. To add some spice to the mix, you decide to set a timeout for the task. If the third-party API takes too long and doesn’t return the result within the timeout, we’ll label it as error and move on, regardless of whether it eventually responds or not. We’re all about efficiency here! However, if the API does manage to return the result within the timeout, we’ll update the task status accordingly. ...

When I first time built a Golang project from VS Code wsl mode, I got the below error: Build Error: go build -o /home/oscar/source/github.com/xx/xx/__debug_bin -gcflags all=-N -l . # runtime/cgo cgo: C compiler "gcc" not found: exec: "gcc": executable file not found in $PATH (exit status 2) My first reaction for this error is to install the gcc compiler in my Windows environment. However, the solution is actually to install gcc compiler in the wsl environment. ...

1. Error 1: fatal: could not read Username for 'https://github.com': terminal prompts disabled The issue appears when I tried to download a private golang repository by the command go get github.com/oscarzhou/private-helloworld. The completed error shows as below: % go get github.com/oscarzhou/private-helloworld go: module github.com/oscarzhou/private-helloworld: git ls-remote -q origin in /Users/oscarzhou/go/pkg/mod/cache/vcs/c5fb5660c8bfa54f1b957fc4e651ac76f19b939fc9015bf3bcbc21a34c925af7: exit status 128: fatal: could not read Username for 'https://github.com': terminal prompts disabled Confirm the import path was entered correctly. If this is a private repository, see https://golang.org/doc/faq#git_https for additional information. If you have already googled this issue, you may find that most of the answers tell you to configure your git as shown below: ...

Sometimes when I open the Golang project with VSCode, some import packages are highlighted with error underline and the error message is like below error while importing github.com/jpillora/chisel/client: module lookup disabled by GOPROXY=off If you are sure that the packages are downloaded already, reloading the VSCode window should solve the issue.

To make the project backward-compatible, a common util function for comparing the semantic version is indispensable. Here is a Golang solution implemented by leveraging go-semver package. package utils import "github.com/coreos/go-semver/semver" // CompareSemanticVersion compares two string written in semver format // return 0 indicates that the first version equals to the second version // return 1 indicates that the first version is greater than the second version // return -1 indicates that the first version is less than the second version func CompareSemanticVersion(current, last string) int { if current == last { return 0 } currentVersion := semver.New(current) lastVersion := semver.New(last) if currentVersion.LessThan(*lastVersion) { return -1 } return 1 } The unit test: ...

I will show a simple example in this post. Let’s say the program called cli-example. package main import ( "flag" "fmt" "os" ) func main() { command := os.Args[1] os.Args = append(os.Args[:1], os.Args[2:]...) switch command { case "version": fmt.Println("1.1.1") } } The 1st argument will always be the binary name, so the command starts from the 2nd argument. If your app also needs the subcommand, then extract it from the 3rd argument, like docker image ls. ...