backscanner alternatives and similar packages
Based on the "Utilities" category.
Alternatively, view backscanner alternatives based on common mentions on social networks and blogs.
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项目文档
基于vite+vue3+gin搭建的开发基础平台(支持TS,JS混用),集成jwt鉴权,权限管理,动态路由,显隐可控组件,分页封装,多点登录拦截,资源权限,上传下载,代码生成器,表单生成器等开发必备功能。 -
excelize
Go language library for reading and writing Microsoft Excel™ (XLAM / XLSM / XLSX / XLTM / XLTX) spreadsheets -
xlsx
(No longer maintained!) Go (golang) library for reading and writing XLSX files. -
godotenv
A Go port of Ruby's dotenv library (Loads environment variables from .env files) -
hystrix-go
Netflix's Hystrix latency and fault tolerance library, for Go -
go-funk
A modern Go utility library which provides helpers (map, find, contains, filter, ...) -
gorequest
GoRequest -- Simplified HTTP client ( inspired by nodejs SuperAgent ) -
goreporter
A Golang tool that does static analysis, unit testing, code review and generate code quality report. -
Kopia
Cross-platform backup tool for Windows, macOS & Linux with fast, incremental backups, client-side end-to-end encryption, compression and data deduplication. CLI and GUI included. -
gojson
Automatically generate Go (golang) struct definitions from example JSON -
lancet
A comprehensive, efficient, and reusable util function library of go. -
create-go-app
✨ Create a new production-ready project with backend, frontend and deploy automation by running one CLI command! -
spinner
Go (golang) package with 90 configurable terminal spinner/progress indicators. -
filetype
Fast, dependency-free Go package to infer binary file types based on the magic numbers header signature -
mole
CLI application to create ssh tunnels focused on resiliency and user experience. -
boilr
:zap: boilerplate template manager that generates files or directories from template repositories -
EaseProbe
A simple, standalone, and lightweight tool that can do health/status checking, written in Go. -
beaver
💨 A real time messaging system to build a scalable in-app notifications, multiplayer games, chat apps in web and mobile apps. -
go-underscore
Helpfully Functional Go - A useful collection of Go utilities. Designed for programmer happiness. -
JobRunner
Framework for performing work asynchronously, outside of the request flow -
mimetype
A fast Golang library for media type and file extension detection, based on magic numbers -
git-time-metric
Simple, seamless, lightweight time tracking for Git
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README
backscanner
Ever needed or wondered how to efficiently search for something in a log file, but starting at the end and going backward? Here's your solution.
Package backscanner
provides a scanner similar to bufio.Scanner
, but it reads
and returns lines in reverse order, starting at a given position (which may be
the end of the input) and going backward.
This library only uses the standard library, but the test uses an external package. To install this library (along with the test dependency), simply run:
go get -t github.com/icza/backscanner
Advancing and accessing lines of the input is done by calling Scanner.Line()
,
which returns the next line (previous in the source) as a string
.
For maximum efficiency there is Scanner.LineBytes()
. It returns the next line
as a byte slice, which shares its backing array with the internal buffer of
Scanner
. This is because no copy is made from the line data; but this also
means you can only inspect or search in the slice before calling Line()
or
LineBytes()
again, as the content of the internal buffer–and thus slices
returned by LineBytes()
–may be overwritten. If you need to retain the line
data, make a copy of it or use Line()
.
Example using it:
input := "Line1\nLine2\nLine3"
scanner := backscanner.New(strings.NewReader(input), len(input))
for {
line, pos, err := scanner.Line()
if err != nil {
fmt.Println("Error:", err)
break
}
fmt.Printf("Line position: %2d, line: %q\n", pos, line)
}
Output:
Line position: 12, line: "Line3"
Line position: 6, line: "Line2"
Line position: 0, line: "Line1"
Error: EOF
Using it to efficiently scan a file, finding last occurrence of a string ("error"
):
f, err := os.Open("mylog.txt")
if err != nil {
panic(err)
}
fi, err := f.Stat()
if err != nil {
panic(err)
}
defer f.Close()
scanner := backscanner.New(f, int(fi.Size()))
what := []byte("error")
for {
line, pos, err := scanner.LineBytes()
if err != nil {
if err == io.EOF {
fmt.Printf("%q is not found in file.\n", what)
} else {
fmt.Println("Error:", err)
}
break
}
if bytes.Contains(line, what) {
fmt.Printf("Found %q at line position: %d, line: %q\n", what, pos, line)
break
}
}