mirror of
https://github.com/astaxie/beego.git
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477 lines
9.5 KiB
Go
477 lines
9.5 KiB
Go
// most reference from github.com/realint/dbgutil
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package toolbox
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import (
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"bytes"
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"fmt"
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"log"
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"reflect"
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"runtime"
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)
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var (
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dunno = []byte("???")
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centerDot = []byte("·")
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dot = []byte(".")
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lbr = []byte("{")
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lbrn = []byte("{\n")
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com = []byte(",")
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comn = []byte(",\n")
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rbr = []byte("}")
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comnrbr = []byte(",\n}")
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)
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type pointerInfo struct {
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prev *pointerInfo
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n int
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addr uintptr
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pos int
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used []int
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}
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//
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// print the data in console
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//
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func Display(data ...interface{}) {
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display(true, data...)
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}
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//
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// return string
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//
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func GetDisplayString(data ...interface{}) string {
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return display(false, data...)
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}
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func display(displayed bool, data ...interface{}) string {
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var pc, file, line, ok = runtime.Caller(2)
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if !ok {
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return ""
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}
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var buf = new(bytes.Buffer)
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fmt.Fprintf(buf, "[Debug] at %s() [%s:%d]\n", function(pc), file, line)
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fmt.Fprintf(buf, "\n[Variables]\n")
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for i := 0; i < len(data); i += 2 {
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var output = fomateinfo(len(data[i].(string))+3, data[i+1])
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fmt.Fprintf(buf, "%s = %s", data[i], output)
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}
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if displayed {
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log.Print(buf)
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}
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return buf.String()
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}
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//
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// return fomateinfo
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//
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func fomateinfo(headlen int, data ...interface{}) []byte {
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var buf = new(bytes.Buffer)
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if len(data) > 1 {
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fmt.Fprint(buf, " ")
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fmt.Fprint(buf, "[")
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fmt.Fprintln(buf)
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}
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for k, v := range data {
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var buf2 = new(bytes.Buffer)
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var pointers *pointerInfo
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var interfaces []reflect.Value = make([]reflect.Value, 0, 10)
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printKeyValue(buf2, reflect.ValueOf(v), &pointers, &interfaces, nil, true, " ", 1)
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if k < len(data)-1 {
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fmt.Fprint(buf2, ", ")
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}
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fmt.Fprintln(buf2)
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buf.Write(buf2.Bytes())
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}
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if len(data) > 1 {
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fmt.Fprintln(buf)
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fmt.Fprint(buf, " ")
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fmt.Fprint(buf, "]")
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}
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return buf.Bytes()
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}
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func isSimpleType(val reflect.Value, kind reflect.Kind, pointers **pointerInfo, interfaces *[]reflect.Value) bool {
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switch kind {
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case reflect.Bool:
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return true
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return true
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case reflect.Uint8, reflect.Uint16, reflect.Uint, reflect.Uint32, reflect.Uint64:
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return true
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case reflect.Float32, reflect.Float64:
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return true
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case reflect.Complex64, reflect.Complex128:
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return true
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case reflect.String:
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return true
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case reflect.Chan:
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return true
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case reflect.Invalid:
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return true
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case reflect.Interface:
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for _, in := range *interfaces {
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if reflect.DeepEqual(in, val) {
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return true
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}
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}
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return false
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case reflect.UnsafePointer:
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if val.IsNil() {
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return true
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}
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var elem = val.Elem()
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if isSimpleType(elem, elem.Kind(), pointers, interfaces) {
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return true
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}
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var addr = val.Elem().UnsafeAddr()
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for p := *pointers; p != nil; p = p.prev {
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if addr == p.addr {
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return true
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}
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}
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return false
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}
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return false
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}
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func printKeyValue(buf *bytes.Buffer, val reflect.Value, pointers **pointerInfo, interfaces *[]reflect.Value, structFilter func(string, string) bool, formatOutput bool, indent string, level int) {
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var t = val.Kind()
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switch t {
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case reflect.Bool:
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fmt.Fprint(buf, val.Bool())
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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fmt.Fprint(buf, val.Int())
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case reflect.Uint8, reflect.Uint16, reflect.Uint, reflect.Uint32, reflect.Uint64:
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fmt.Fprint(buf, val.Uint())
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case reflect.Float32, reflect.Float64:
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fmt.Fprint(buf, val.Float())
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case reflect.Complex64, reflect.Complex128:
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fmt.Fprint(buf, val.Complex())
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case reflect.UnsafePointer:
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fmt.Fprintf(buf, "unsafe.Pointer(0x%X)", val.Pointer())
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case reflect.Ptr:
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if val.IsNil() {
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fmt.Fprint(buf, "nil")
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return
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}
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var addr = val.Elem().UnsafeAddr()
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for p := *pointers; p != nil; p = p.prev {
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if addr == p.addr {
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p.used = append(p.used, buf.Len())
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fmt.Fprintf(buf, "0x%X", addr)
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return
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}
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}
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*pointers = &pointerInfo{
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prev: *pointers,
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addr: addr,
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pos: buf.Len(),
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used: make([]int, 0),
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}
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fmt.Fprint(buf, "&")
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printKeyValue(buf, val.Elem(), pointers, interfaces, structFilter, formatOutput, indent, level)
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case reflect.String:
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fmt.Fprint(buf, "\"", val.String(), "\"")
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case reflect.Interface:
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var value = val.Elem()
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if !value.IsValid() {
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fmt.Fprint(buf, "nil")
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} else {
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for _, in := range *interfaces {
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if reflect.DeepEqual(in, val) {
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fmt.Fprint(buf, "repeat")
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return
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}
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}
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*interfaces = append(*interfaces, val)
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printKeyValue(buf, value, pointers, interfaces, structFilter, formatOutput, indent, level+1)
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}
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case reflect.Struct:
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var t = val.Type()
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fmt.Fprint(buf, t)
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fmt.Fprint(buf, "{")
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for i := 0; i < val.NumField(); i++ {
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if formatOutput {
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fmt.Fprintln(buf)
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} else {
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fmt.Fprint(buf, " ")
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}
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var name = t.Field(i).Name
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if formatOutput {
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for ind := 0; ind < level; ind++ {
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fmt.Fprint(buf, indent)
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}
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}
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fmt.Fprint(buf, name)
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fmt.Fprint(buf, ": ")
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if structFilter != nil && structFilter(t.String(), name) {
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fmt.Fprint(buf, "ignore")
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} else {
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printKeyValue(buf, val.Field(i), pointers, interfaces, structFilter, formatOutput, indent, level+1)
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}
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fmt.Fprint(buf, ",")
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}
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if formatOutput {
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fmt.Fprintln(buf)
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for ind := 0; ind < level-1; ind++ {
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fmt.Fprint(buf, indent)
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}
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} else {
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fmt.Fprint(buf, " ")
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}
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fmt.Fprint(buf, "}")
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case reflect.Array, reflect.Slice:
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fmt.Fprint(buf, val.Type())
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fmt.Fprint(buf, "{")
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var allSimple = true
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for i := 0; i < val.Len(); i++ {
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var elem = val.Index(i)
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var isSimple = isSimpleType(elem, elem.Kind(), pointers, interfaces)
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if !isSimple {
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allSimple = false
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}
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if formatOutput && !isSimple {
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fmt.Fprintln(buf)
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} else {
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fmt.Fprint(buf, " ")
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}
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if formatOutput && !isSimple {
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for ind := 0; ind < level; ind++ {
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fmt.Fprint(buf, indent)
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}
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}
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printKeyValue(buf, elem, pointers, interfaces, structFilter, formatOutput, indent, level+1)
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if i != val.Len()-1 || !allSimple {
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fmt.Fprint(buf, ",")
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}
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}
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if formatOutput && !allSimple {
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fmt.Fprintln(buf)
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for ind := 0; ind < level-1; ind++ {
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fmt.Fprint(buf, indent)
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}
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} else {
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fmt.Fprint(buf, " ")
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}
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fmt.Fprint(buf, "}")
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case reflect.Map:
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var t = val.Type()
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var keys = val.MapKeys()
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fmt.Fprint(buf, t)
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fmt.Fprint(buf, "{")
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var allSimple = true
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for i := 0; i < len(keys); i++ {
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var elem = val.MapIndex(keys[i])
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var isSimple = isSimpleType(elem, elem.Kind(), pointers, interfaces)
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if !isSimple {
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allSimple = false
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}
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if formatOutput && !isSimple {
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fmt.Fprintln(buf)
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} else {
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fmt.Fprint(buf, " ")
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}
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if formatOutput && !isSimple {
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for ind := 0; ind <= level; ind++ {
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fmt.Fprint(buf, indent)
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}
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}
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printKeyValue(buf, keys[i], pointers, interfaces, structFilter, formatOutput, indent, level+1)
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fmt.Fprint(buf, ": ")
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printKeyValue(buf, elem, pointers, interfaces, structFilter, formatOutput, indent, level+1)
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if i != val.Len()-1 || !allSimple {
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fmt.Fprint(buf, ",")
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}
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}
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if formatOutput && !allSimple {
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fmt.Fprintln(buf)
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for ind := 0; ind < level-1; ind++ {
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fmt.Fprint(buf, indent)
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}
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} else {
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fmt.Fprint(buf, " ")
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}
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fmt.Fprint(buf, "}")
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case reflect.Chan:
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fmt.Fprint(buf, val.Type())
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case reflect.Invalid:
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fmt.Fprint(buf, "invalid")
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default:
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fmt.Fprint(buf, "unknow")
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}
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}
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func printPointerInfo(buf *bytes.Buffer, headlen int, pointers *pointerInfo) {
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var anyused = false
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var pointerNum = 0
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for p := pointers; p != nil; p = p.prev {
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if len(p.used) > 0 {
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anyused = true
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}
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pointerNum += 1
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p.n = pointerNum
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}
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if anyused {
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var pointerBufs = make([][]rune, pointerNum+1)
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for i := 0; i < len(pointerBufs); i++ {
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var pointerBuf = make([]rune, buf.Len()+headlen)
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for j := 0; j < len(pointerBuf); j++ {
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pointerBuf[j] = ' '
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}
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pointerBufs[i] = pointerBuf
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}
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for pn := 0; pn <= pointerNum; pn++ {
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for p := pointers; p != nil; p = p.prev {
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if len(p.used) > 0 && p.n >= pn {
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if pn == p.n {
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pointerBufs[pn][p.pos+headlen] = '└'
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var maxpos = 0
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for i, pos := range p.used {
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if i < len(p.used)-1 {
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pointerBufs[pn][pos+headlen] = '┴'
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} else {
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pointerBufs[pn][pos+headlen] = '┘'
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}
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maxpos = pos
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}
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for i := 0; i < maxpos-p.pos-1; i++ {
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if pointerBufs[pn][i+p.pos+headlen+1] == ' ' {
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pointerBufs[pn][i+p.pos+headlen+1] = '─'
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}
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}
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} else {
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pointerBufs[pn][p.pos+headlen] = '│'
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for _, pos := range p.used {
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if pointerBufs[pn][pos+headlen] == ' ' {
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pointerBufs[pn][pos+headlen] = '│'
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} else {
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pointerBufs[pn][pos+headlen] = '┼'
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}
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}
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}
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}
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}
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buf.WriteString(string(pointerBufs[pn]) + "\n")
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}
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}
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}
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//
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// get stack info
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//
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func stack(skip int, indent string) []byte {
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var buf = new(bytes.Buffer)
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for i := skip; ; i++ {
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var pc, file, line, ok = runtime.Caller(i)
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if !ok {
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break
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}
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buf.WriteString(indent)
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fmt.Fprintf(buf, "at %s() [%s:%d]\n", function(pc), file, line)
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}
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return buf.Bytes()
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}
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// function returns, if possible, the name of the function containing the PC.
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func function(pc uintptr) []byte {
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fn := runtime.FuncForPC(pc)
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if fn == nil {
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return dunno
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}
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name := []byte(fn.Name())
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// The name includes the path name to the package, which is unnecessary
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// since the file name is already included. Plus, it has center dots.
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// That is, we see
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// runtime/debug.*T·ptrmethod
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// and want
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// *T.ptrmethod
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if period := bytes.Index(name, dot); period >= 0 {
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name = name[period+1:]
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}
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name = bytes.Replace(name, centerDot, dot, -1)
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return name
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}
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