|
| 1 | +// Copyright 2025 PingCAP, Inc. |
| 2 | +// SPDX-License-Identifier: Apache-2.0 |
| 3 | + |
| 4 | +package config |
| 5 | + |
| 6 | +import ( |
| 7 | + "encoding/json" |
| 8 | + "reflect" |
| 9 | + "strconv" |
| 10 | + "strings" |
| 11 | + |
| 12 | + "github.com/pingcap/tiproxy/lib/util/errors" |
| 13 | +) |
| 14 | + |
| 15 | +type output struct { |
| 16 | + Component string |
| 17 | + Version string |
| 18 | + Parameters []field |
| 19 | +} |
| 20 | + |
| 21 | +type field struct { |
| 22 | + Name string `json:"key"` |
| 23 | + Type string `json:"type"` |
| 24 | + DefaultValue any `json:"default_value"` |
| 25 | + HotReloadable bool `json:"hot_reloadable"` |
| 26 | +} |
| 27 | + |
| 28 | +// ConfigInfo outputs the config info used for loading to the operation system. |
| 29 | +func ConfigInfo(format string) (string, error) { |
| 30 | + if !strings.EqualFold(format, "json") { |
| 31 | + return "", errors.New("only support json format") |
| 32 | + } |
| 33 | + fields := make([]field, 0, 256) |
| 34 | + cfg := NewConfig() |
| 35 | + res, err := formatValue(reflect.ValueOf(*cfg), "", true) |
| 36 | + if err != nil { |
| 37 | + return "", err |
| 38 | + } |
| 39 | + fields = append(fields, res...) |
| 40 | + |
| 41 | + op := output{ |
| 42 | + Component: "TiProxy Server", |
| 43 | + Version: "", |
| 44 | + Parameters: fields, |
| 45 | + } |
| 46 | + bytes, err := json.MarshalIndent(op, "", " ") |
| 47 | + return string(bytes), err |
| 48 | +} |
| 49 | + |
| 50 | +func formatValue(v reflect.Value, name string, reloadable bool) ([]field, error) { |
| 51 | + if !v.IsValid() { |
| 52 | + return nil, errors.New("invalid value") |
| 53 | + } |
| 54 | + |
| 55 | + if v.Kind() == reflect.Interface { |
| 56 | + return formatValue(v.Elem(), name, reloadable) |
| 57 | + } |
| 58 | + |
| 59 | + if v.Kind() == reflect.Ptr { |
| 60 | + if v.IsNil() { |
| 61 | + return nil, nil |
| 62 | + } |
| 63 | + return formatValue(v.Elem(), name, reloadable) |
| 64 | + } |
| 65 | + |
| 66 | + switch v.Kind() { |
| 67 | + case reflect.Bool: |
| 68 | + return []field{{Name: name, Type: "bool", DefaultValue: v.Bool(), HotReloadable: reloadable}}, nil |
| 69 | + case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
| 70 | + return []field{{Name: name, Type: "int", DefaultValue: v.Int(), HotReloadable: reloadable}}, nil |
| 71 | + case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64: |
| 72 | + return []field{{Name: name, Type: "int", DefaultValue: v.Uint(), HotReloadable: reloadable}}, nil |
| 73 | + case reflect.Float32, reflect.Float64: |
| 74 | + return []field{{Name: name, Type: "float", DefaultValue: v.Float(), HotReloadable: reloadable}}, nil |
| 75 | + case reflect.String: |
| 76 | + return []field{{Name: name, Type: "string", DefaultValue: v.String(), HotReloadable: reloadable}}, nil |
| 77 | + case reflect.Slice, reflect.Array: |
| 78 | + return formatSliceOrArray(v, name, reloadable) |
| 79 | + case reflect.Struct: |
| 80 | + return formatStruct(v, name) |
| 81 | + case reflect.Map: |
| 82 | + return formatMap(v, name, reloadable) |
| 83 | + default: |
| 84 | + return nil, errors.Errorf("unsupported type %s", v.Kind().String()) |
| 85 | + } |
| 86 | +} |
| 87 | + |
| 88 | +func formatSliceOrArray(v reflect.Value, name string, reloadable bool) ([]field, error) { |
| 89 | + length := v.Len() |
| 90 | + elements := make([]string, 0, length) |
| 91 | + for i := 0; i < length; i++ { |
| 92 | + str, err := valueToString(v.Index(i)) |
| 93 | + if err != nil { |
| 94 | + return nil, err |
| 95 | + } |
| 96 | + elements = append(elements, str) |
| 97 | + } |
| 98 | + return []field{{Name: name, Type: "json", DefaultValue: elements, HotReloadable: reloadable}}, nil |
| 99 | +} |
| 100 | + |
| 101 | +func formatStruct(v reflect.Value, name string) ([]field, error) { |
| 102 | + typ := v.Type() |
| 103 | + fields := make([]field, 0, typ.NumField()) |
| 104 | + |
| 105 | + for i := 0; i < typ.NumField(); i++ { |
| 106 | + f := typ.Field(i) |
| 107 | + jsonName := strings.Split(f.Tag.Get("json"), ",")[0] |
| 108 | + switch jsonName { |
| 109 | + case "-": |
| 110 | + continue |
| 111 | + case "": |
| 112 | + jsonName = name |
| 113 | + default: |
| 114 | + if name != "" { |
| 115 | + jsonName = name + "." + jsonName |
| 116 | + } |
| 117 | + } |
| 118 | + reloadable := f.Tag.Get("reloadable") == "true" |
| 119 | + res, err := formatValue(v.Field(i), jsonName, reloadable) |
| 120 | + if err != nil { |
| 121 | + return nil, err |
| 122 | + } |
| 123 | + fields = append(fields, res...) |
| 124 | + } |
| 125 | + return fields, nil |
| 126 | +} |
| 127 | + |
| 128 | +func formatMap(v reflect.Value, name string, reloadable bool) ([]field, error) { |
| 129 | + entries := make(map[string]string) |
| 130 | + if v.IsNil() || v.Len() == 0 { |
| 131 | + return []field{{Name: name, Type: "json", DefaultValue: entries, HotReloadable: reloadable}}, nil |
| 132 | + } |
| 133 | + |
| 134 | + for _, key := range v.MapKeys() { |
| 135 | + val := v.MapIndex(key) |
| 136 | + keyStr, err := valueToString(key) |
| 137 | + if err != nil { |
| 138 | + return nil, err |
| 139 | + } |
| 140 | + valStr, err := valueToString(val) |
| 141 | + if err != nil { |
| 142 | + return nil, err |
| 143 | + } |
| 144 | + entries[keyStr] = valStr |
| 145 | + } |
| 146 | + return []field{{Name: name, Type: "json", DefaultValue: entries, HotReloadable: reloadable}}, nil |
| 147 | +} |
| 148 | + |
| 149 | +func valueToString(v reflect.Value) (string, error) { |
| 150 | + switch v.Kind() { |
| 151 | + case reflect.String: |
| 152 | + return strconv.Quote(v.String()), nil |
| 153 | + case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
| 154 | + return strconv.FormatInt(v.Int(), 10), nil |
| 155 | + case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64: |
| 156 | + return strconv.FormatUint(v.Uint(), 10), nil |
| 157 | + case reflect.Float32, reflect.Float64: |
| 158 | + return strconv.FormatFloat(v.Float(), 'f', -1, 64), nil |
| 159 | + case reflect.Bool: |
| 160 | + return strconv.FormatBool(v.Bool()), nil |
| 161 | + default: |
| 162 | + return "", errors.Errorf("unsupported type %s", v.Kind().String()) |
| 163 | + } |
| 164 | +} |
0 commit comments