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09 2023 档案

• Go - Function closures and web middleware
  摘要：package main import "fmt" func adder() func(int) int { sum := 0 return func(x int) int { sum += x return sum } } func main() { pos, neg := adder(), ad 阅读全文
  posted @ 2023-09-30 10:14 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Go - Logging to the System Log Service
  摘要：Problem: You want to log in to the system log instead of your logfiles. Solution: Use the log/syslog package to write to syslog. Syslog is a standard 阅读全文
  posted @ 2023-09-30 08:20 ZhangZhihuiAAA 阅读(17) 评论(0) 推荐(0) 编辑
• Go - Using Log Levels
  摘要：Examples of log levels from high to low are: • Fatal • Error• Warn • Info • Debug To set up log levels for your logs, you can add the level to each li 阅读全文
  posted @ 2023-09-29 17:55 ZhangZhihuiAAA 阅读(24) 评论(0) 推荐(0) 编辑
• Go - Logging to File
  摘要：Problem: You want to log events to a logfile instead of standard error. Solution: Use the SetOutput function to set the log to write to a file. You us 阅读全文
  posted @ 2023-09-29 15:15 ZhangZhihuiAAA 阅读(6) 评论(0) 推荐(0) 编辑
• Go - Inspecting Errors
  摘要：Problem: You want to check for specific errors or specific types of errors. Solution: Use the errors.Is and errors.As functions. The errors.Is functio 阅读全文
  posted @ 2023-09-29 14:24 ZhangZhihuiAAA 阅读(6) 评论(0) 推荐(0) 编辑
• Go - Wrapping an Error with Other Errors
  摘要：Problem: You want to provide additional information and context to an error you receive before returning it as another error. Solution: Wrap the error 阅读全文
  posted @ 2023-09-29 10:24 ZhangZhihuiAAA 阅读(7) 评论(0) 推荐(0) 编辑
• Go - Creating Customized Errors
  摘要：Problem: You want to create custom errors to communicate more information about the error encountered. Solution: Create a new string - based error or 阅读全文
  posted @ 2023-09-29 10:11 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Go - Using Multiple Versions of the Same Dependent Packages
  摘要：Problem: You want to use multiple versions of the same dependent packages in your code. Solution: Use the replace directive in the go.mod file to rena 阅读全文
  posted @ 2023-09-29 09:17 ZhangZhihuiAAA 阅读(25) 评论(0) 推荐(0) 编辑
• Go - Requiring Local Versions of Dependent Packages
  摘要：Problem: You want to use local versions of the dependent packages. Solution: Set up Go to use a vendor directory by running go mod vendor. Local versi 阅读全文
  posted @ 2023-09-29 08:53 ZhangZhihuiAAA 阅读(3) 评论(0) 推荐(0) 编辑
• Go - 这个for循环是怎么退出的
  摘要：package main import ( "fmt" "sync" "time" ) var workers = 3 func processItem(input <-chan int, output chan<- int, wg *sync.WaitGroup) { for { fmt.Prin 阅读全文
  posted @ 2023-09-27 16:56 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Go - ERROR: fatal error: all goroutines are asleep - deadlock!
  摘要：main.go: package main import "fmt" func main() { ch := make(chan int) ch <- 1 a := <-ch fmt.Println(a) } Got error: zzh@ZZHPC:/zdata/MyPrograms/Go/tes 阅读全文
  posted @ 2023-09-27 16:18 ZhangZhihuiAAA 阅读(21) 评论(0) 推荐(0) 编辑
• Go - Using channels to receive interrupts in a program
  摘要：Within the Kubernetes deployment environment, applications will actually be sent the SIGTERM signal first if it has been decided the pod holding the a 阅读全文
  posted @ 2023-09-26 23:00 ZhangZhihuiAAA 阅读(2) 评论(0) 推荐(0) 编辑
• Microservice - What are microservices, and why are microservices?
  摘要：The concept of microservices is simply breaking a single large potential service into many smaller services that work together, hence, the name. One v 阅读全文
  posted @ 2023-09-25 19:45 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Docker - docker compose
  摘要：docker-compose.yaml: version: '3.3' services: nginx: image: nginx:latest ports: - 8080:80 With regards to the preceding docker-compose file, we have t 阅读全文
  posted @ 2023-09-25 11:35 ZhangZhihuiAAA 阅读(69) 评论(0) 推荐(0) 编辑
• Docker - Install Docker Compose
  摘要：Install using the repository Set up the repository. Find distro-specific instructions in: Ubuntu | CentOS | Debian | Raspberry Pi OS | Fedora | RHEL | 阅读全文
  posted @ 2023-09-25 10:50 ZhangZhihuiAAA 阅读(36) 评论(0) 推荐(0) 编辑
• Docker - ERROR: failed to solve: golang:latest: error getting credentials - err: exec: "docker-credential-desktop": executable file not found in $PATH, out: ``
  摘要：Dockerfile: FROM golang:latest WORKDIR /app ADD . . RUN go env -w GOPROXY=https://goproxy.io,direct RUN go get RUN go build -o app . CMD ["/app/app"] 阅读全文
  posted @ 2023-09-23 17:41 ZhangZhihuiAAA 阅读(645) 评论(0) 推荐(1) 编辑
• Docker - Expose a port
  摘要：In order to access the nginx from our workstation, we would need to expose the port 80 from within the nginx container to our workstation. Run the ngi 阅读全文
  posted @ 2023-09-22 21:28 ZhangZhihuiAAA 阅读(10) 评论(0) 推荐(0) 编辑
• Go - Run an application using systemd
  摘要：The systemd tool fits our simple case of requiring the application to start on server boot-up as well as ensuring that the application is restarted in 阅读全文
  posted @ 2023-09-22 10:01 ZhangZhihuiAAA 阅读(4) 评论(0) 推荐(0) 编辑
• Go - Separate external calls from our main logic
  摘要：Original implementation: type SingleItem struct { Field string `json:"field"` Hour int `json:"hour"` Minute int `json:"minute"` ItemCode string `json: 阅读全文
  posted @ 2023-09-21 11:14 ZhangZhihuiAAA 阅读(2) 评论(0) 推荐(0) 编辑
• Docker - Install and Uninstall
  摘要：Uninstall old versions Before you can install Docker Engine, you need to uninstall any conflicting packages. Distro maintainers provide unofficial dis 阅读全文
  posted @ 2023-09-21 10:50 ZhangZhihuiAAA 阅读(14) 评论(0) 推荐(0) 编辑
• VSCode - Go: Generate Unit Tests for Function
  摘要：Right click the function name. Select item 'Go: Generate Unit Tests for Function' in the pop-up menu: A test file named <file name>_test.go is generat 阅读全文
  posted @ 2023-09-21 09:36 ZhangZhihuiAAA 阅读(44) 评论(0) 推荐(0) 编辑
• Common Protocols
  摘要：Common protocols that handle exchanging data between client and server applications:• HTTP protocol: This is more of a text-based protocol and is cons 阅读全文
  posted @ 2023-09-19 14:01 ZhangZhihuiAAA 阅读(13) 评论(0) 推荐(0) 编辑
• Go - Proberb: Never use global variables
  摘要：Never use global variables 阅读全文
  posted @ 2023-09-19 12:41 ZhangZhihuiAAA 阅读(12) 评论(0) 推荐(0) 编辑
• Go - Proverb: Accept interfaces, return structs
  摘要：fake.go package fake import "fmt" type ExampleStruct struct { Item1 string Item2 string Item3 string } func (e ExampleStruct) LogLine() { fmt.Printf(" 阅读全文
  posted @ 2023-09-19 11:18 ZhangZhihuiAAA 阅读(8) 评论(0) 推荐(0) 编辑
• Go - Performance Comparison by Fibonacci Functions
  摘要：fibonacci.go package algorithms // Dynamic Programming func Fibonacci1(n int) int { if n <= 0 { return 0 } if n <= 2 { return 1 } previous1 := 1 previ 阅读全文
  posted @ 2023-09-18 20:50 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Zgo - Sort Algorithms
  摘要：sort.go package algorithms func MergeSort(items []int) []int { n := len(items) var combined []int switch { case n <= 1: combined = items case n == 2: 阅读全文
  posted @ 2023-09-17 22:35 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Linux - zip unzip
  摘要：$ ls readme readme $ zip readme zip error: Nothing to do! (readme.zip) $ ls readme* readme $ zip readme.zip readme adding: readme (deflated 4%) $ ls r 阅读全文
  posted @ 2023-09-14 16:59 ZhangZhihuiAAA 阅读(7) 评论(0) 推荐(0) 编辑
• Docker - Error: permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock
  摘要：Adding user to the docker group can fix this issue: zzh@ZZHPC:~$ sudo usermod -aG docker zzh zzh@ZZHPC:~$ newgrp docker zzh@ZZHPC:~$ docker run hello- 阅读全文
  posted @ 2023-09-14 09:25 ZhangZhihuiAAA 阅读(8) 评论(0) 推荐(0) 编辑
• Docker - docker-compose.yml for PostgreSQL
  摘要： 阅读全文
  posted @ 2023-09-13 12:08 ZhangZhihuiAAA 阅读(2) 评论(0) 推荐(0) 编辑
• Ubuntu - snap info / apt info
  摘要：zzh@ZZHPC:~$ sudo snap info docker name: docker summary: Docker container runtime publisher: Canonical✓ store-url: https://snapcraft.io/docker contact 阅读全文
  posted @ 2023-09-13 10:01 ZhangZhihuiAAA 阅读(15) 评论(0) 推荐(0) 编辑
• Go - test coverage
  摘要： 阅读全文
  posted @ 2023-09-11 11:19 ZhangZhihuiAAA 阅读(5) 评论(0) 推荐(0) 编辑
• Go - benchstat
  摘要：zzh@ZZHPC:/zdata/MyPrograms/Go/aaa/Ch06/06_02$ go test -run NONE -bench . -count=5 -benchmem | tee cols.txt goos: linux goarch: amd64 pkg: zzh/aaa/Ch0 阅读全文
  posted @ 2023-09-09 16:44 ZhangZhihuiAAA 阅读(31) 评论(0) 推荐(0) 编辑
• Regular Expression
  摘要：POSIX basic and extended[edit] In the POSIX standard, Basic Regular Syntax (BRE) requires that the metacharacters ( ) and { } be designated \(\) and \ 阅读全文
  posted @ 2023-09-07 09:20 ZhangZhihuiAAA 阅读(12) 评论(0) 推荐(0) 编辑
• Go - benchmark profile CPU and Memory
  摘要：zzh@ZZHPC:/zdata/MyPrograms/Go/aaa$ go test -run NONE -bench . goos: linux goarch: amd64 pkg: zzh/aaa cpu: Intel(R) Core(TM) i5-9600K CPU @ 3.70GHz Be 阅读全文
  posted @ 2023-09-05 15:36 ZhangZhihuiAAA 阅读(9) 评论(0) 推荐(0) 编辑