GoLang調(diào)用鏈可視化go-callvis使用介紹

更新時間：2023年02月02日 14:45:06 作者：raoxiaoya

與鏈路追蹤（Tracing）不同，Tracing關注復雜的分布式環(huán)境中各個服務節(jié)點間的調(diào)用關系，主要用于服務治理。而我們本次探索的代碼調(diào)用鏈路則是代碼方法級別的調(diào)用關系，主要用于代碼設計

本文介紹一款工具 go-callvis，它能夠?qū)?Go 代碼的調(diào)用關系可視化出來，并提供了可交互式的 web 服務。

go get -u github.com/ofabry/go-callvis
在windows系統(tǒng)上并沒有自動安裝，需要進入下載的目錄go install
在linux系統(tǒng)上自動安裝了

> go-callvis

go-callvis: visualize call graph of a Go program.

Usage:

go-callvis [flags] package

Package should be main package, otherwise -tests flag must be used.

Flags:

-debug
Enable verbose log.
-file string
output filename - omit to use server mode
-focus string
Focus specific package using name or import path. (default "main")
-format string
output file format [svg | png | jpg | ...] (default "svg")
-graphviz
Use Graphviz's dot program to render images.
-group string
Grouping functions by packages and/or types [pkg, type] (separated by comma) (default "pkg")
-http string
HTTP service address. (default ":7878")
-ignore string
Ignore package paths containing given prefixes (separated by comma)
-include string
Include package paths with given prefixes (separated by comma)
-limit string
Limit package paths to given prefixes (separated by comma)
-minlen uint
Minimum edge length (for wider output). (default 2)
-nodesep float
Minimum space between two adjacent nodes in the same rank (for taller output). (default 0.35)
-nointer
Omit calls to unexported functions.
-nostd
Omit calls to/from packages in standard library.
-skipbrowser
Skip opening browser.
-tags build tags
a list of build tags to consider satisfied during the build. For more information about build tags, see the description of buil
d constraints in the documentation for the go/build package
-tests
Include test code.
-version
Show version and exit.

依賴

Go 1.17+
Graphviz (可選，當工具指定了 -graphviz 時需要)

測試代碼

package main
import (
	"log"
	"net"
)
func main() {
	// Part 1: create a listener
	l, err := net.Listen("tcp", ":8000")
	if err != nil {
		log.Fatalf("Error listener returned: %s", err)
	}
	defer l.Close()
	for {
		// Part 2: accept new connection
		c, err := l.Accept()
		if err != nil {
			log.Fatalf("Error to accept new connection: %s", err)
		}
		// Part 3: create a goroutine that reads and write back data
		go func() {
			log.Printf("TCP session open")
			defer c.Close()
			for {
				d := make([]byte, 1024)
				// Read from TCP buffer
				_, err := c.Read(d)
				if err != nil {
					log.Printf("Error reading TCP session: %s", err)
					break
				}
				log.Printf("reading data from client: %s\n", string(d))
				// write back data to TCP client
				_, err = c.Write(d)
				if err != nil {
					log.Printf("Error writing TCP session: %s", err)
					break
				}
			}
		}()
	}
}

在linux上可以正常運行，windows上會報錯