VSCode Golang dlv调试数据截断问题及处理方法

使用vscode对golang程序进行调试时会遇到数据截断问题，string只显示前64个字符，array只显示前64个数据。经查dlv是支持以参数方式来控制的。

发现vscode的golang插件里面有个叫做go.delveconfig的配置，是可以设置dlv参数的。分享一下我的整个golang配置：

"go.buildonsave": "off",
  "go.formattool": "goimports",
  "go.linttool": "golangci-lint", //go get -u github.com/golangci/golangci-lint/cmd/golangci-lint
  "go.autocompleteunimportedpackages": true,
  "go.gotosymbol.includeimports": true,
  "go.uselanguageserver": true,
  "go.delveconfig": {
    "dlvloadconfig": {
      "followpointers": true,
      "maxvariablerecurse": 3,
      "maxstringlen": 1024,
      "maxarrayvalues": 1024,
      "maxstructfields": -1
    },
  },
  "[go]": {
    "editor.formatonsave": true,
    "editor.codeactionsonsave": {
      "source.organizeimports": true
    }
  },

需要改的主要是maxstringlen、maxarrayvalues、maxvariablerecurse这三个字段。

参考：

ps：下面看下golang dlv 工具debug 调试注意项

总结一下关于go 的调试工具dlv：https://github.com/derekparker/delve 的使用注意项。

安装：

go get -u github.com/go-delve/delve/cmd/dlv

配置：

以centos为例

export goroot=/usr/lib/golang
export gopath=$home/go
export path=$path:$gopath/bin

使用

以某go服务为例：

• dlv debug xxx.go 指定需要debug的文件
• 进入dlv交互式窗口后，b <filename>:<line> 指定断点
• r arg 指定运行参数
• n 执行一行
• c 运行至断点或程序结束

dlv debug /home/xxx/server.go
(dlv) b /home/xxx/server.go:258
(dlv) r 1
(dlv) n
(dlv) c

注意： b <filename>:<line> 指定断点时，若该行号对应的代码内容为无具体语义的代码（括号、注释等），则会报错：

command failed: could not find /home/xxx/server.go:258

此时可用list 命令先查看上下文代码，避免将无具体语义的代码设为断点。

命令集

the following commands are available:
    args ------------------------ print function arguments.
    break (alias: b) ------------ sets a breakpoint.
    breakpoints (alias: bp) ----- print out info for active breakpoints.
    call ------------------------ resumes process, injecting a function call (experimental!!!)
    clear ----------------------- deletes breakpoint.
    clearall -------------------- deletes multiple breakpoints.
    condition (alias: cond) ----- set breakpoint condition.
    config ---------------------- changes configuration parameters.
    continue (alias: c) --------- run until breakpoint or program termination.
    deferred -------------------- executes command in the context of a deferred call.
    disassemble (alias: disass) - disassembler.
    down ------------------------ move the current frame down.
    edit (alias: ed) ------------ open where you are in $delve_editor or $editor
    exit (alias: quit | q) ------ exit the debugger.
    frame ----------------------- set the current frame, or execute command on a different frame.
    funcs ----------------------- print list of functions.
    goroutine ------------------- shows or changes current goroutine
    goroutines ------------------ list program goroutines.
    help (alias: h) ------------- prints the help message.
    list (alias: ls | l) -------- show source code.
    locals ---------------------- print local variables.
    next (alias: n) ------------- step over to next source line.
    on -------------------------- executes a command when a breakpoint is hit.
    print (alias: p) ------------ evaluate an expression.
    regs ------------------------ print contents of cpu registers.
    restart (alias: r) ---------- restart process.
    set ------------------------- changes the value of a variable.
    source ---------------------- executes a file containing a list of delve commands
    sources --------------------- print list of source files.
    stack (alias: bt) ----------- print stack trace.
    step (alias: s) ------------- single step through program.
    step-instruction (alias: si)  single step a single cpu instruction.
    stepout --------------------- step out of the current function.
    thread (alias: tr) ---------- switch to the specified thread.
    threads --------------------- print out info for every traced thread.
    trace (alias: t) ------------ set tracepoint.
    types ----------------------- print list of types
    up -------------------------- move the current frame up.
    vars ------------------------ print package variables.
    whatis ---------------------- prints type of an expression.

总结

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