3aaba1e784
Refactored Code Structure: Reorganized the code to use helper functions to reduce complexity and improve readability. Field Parsing: Removed excessive nesting in the field parsing logic and introduced utility functions for repetitive tasks. Handling Special Tags: Segregated tag handling into dedicated functions for better maintainability. Permissions & Default Values: Improved permission setup and default value handling using clear helper methods. Embedded Fields: Added modular handling for embedded fields, making the code more concise and maintainable.
388 lines
12 KiB
Go
388 lines
12 KiB
Go
package schema
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import (
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"context"
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"database/sql"
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"database/sql/driver"
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"fmt"
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"reflect"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/jinzhu/now"
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"gorm.io/gorm/clause"
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"gorm.io/gorm/utils"
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)
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// Special types' reflect type
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var (
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TimeReflectType = reflect.TypeOf(time.Time{})
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TimePtrReflectType = reflect.TypeOf(&time.Time{})
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ByteReflectType = reflect.TypeOf(uint8(0))
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)
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type (
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// DataType GORM data type
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DataType string
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// TimeType GORM time type
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TimeType int64
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)
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// GORM time types
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const (
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UnixTime TimeType = 1
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UnixSecond TimeType = 2
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UnixMillisecond TimeType = 3
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UnixNanosecond TimeType = 4
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)
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// GORM fields types
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const (
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Bool DataType = "bool"
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Int DataType = "int"
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Uint DataType = "uint"
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Float DataType = "float"
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String DataType = "string"
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Time DataType = "time"
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Bytes DataType = "bytes"
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)
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const DefaultAutoIncrementIncrement int64 = 1
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// Field represents a field in the schema
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// Improvements made:
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// 1. Added more descriptive comments
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// 2. Moved longer blocks of code into helper functions to improve readability
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// 3. Added error handling improvements and removed unnecessary nesting
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// 4. Simplified boolean checks with utility functions
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// 5. Grouped related initialization logic for clarity
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// 6. Removed duplication by refactoring repeated tasks into functions
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type Field struct {
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Name string
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DBName string
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BindNames []string
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EmbeddedBindNames []string
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DataType DataType
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GORMDataType DataType
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PrimaryKey bool
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AutoIncrement bool
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AutoIncrementIncrement int64
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Creatable bool
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Updatable bool
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Readable bool
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AutoCreateTime TimeType
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AutoUpdateTime TimeType
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HasDefaultValue bool
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DefaultValue string
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DefaultValueInterface interface{}
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NotNull bool
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Unique bool
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Comment string
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Size int
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Precision int
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Scale int
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IgnoreMigration bool
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FieldType reflect.Type
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IndirectFieldType reflect.Type
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StructField reflect.StructField
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Tag reflect.StructTag
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TagSettings map[string]string
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Schema *Schema
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EmbeddedSchema *Schema
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OwnerSchema *Schema
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ReflectValueOf func(context.Context, reflect.Value) reflect.Value
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ValueOf func(context.Context, reflect.Value) (value interface{}, zero bool)
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Set func(context.Context, reflect.Value, interface{}) error
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Serializer SerializerInterface
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NewValuePool FieldNewValuePool
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UniqueIndex string
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}
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// Helper function to update `AutoCreateTime` and `AutoUpdateTime`
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func (field *Field) setAutoTime(fieldType string) {
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if v, ok := field.TagSettings[fieldType]; (ok && utils.CheckTruth(v)) || (!ok && strings.Contains(field.Name, "At") && (field.DataType == Time || field.DataType == Int || field.DataType == Uint)) {
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if field.DataType == Time {
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field.AutoCreateTime = UnixTime
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} else if strings.ToUpper(v) == "NANO" {
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field.AutoCreateTime = UnixNanosecond
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} else if strings.ToUpper(v) == "MILLI" {
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field.AutoCreateTime = UnixMillisecond
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} else {
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field.AutoCreateTime = UnixSecond
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}
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}
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}
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// ParseField parses a reflect.StructField into a Field
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// Major changes:
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// 1. Removed excessive nesting in type detection and value extraction logic.
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// 2. Introduced utility functions to handle repetitive tasks.
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// 3. Improved handling of driver.Valuer to prevent unnecessary allocation or reassignment.
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// 4. Segregated handling of special tags and attributes for better structure and readability.
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func (schema *Schema) ParseField(fieldStruct reflect.StructField) *Field {
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tagSetting := ParseTagSetting(fieldStruct.Tag.Get("gorm"), ";")
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field := &Field{
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Name: fieldStruct.Name,
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DBName: tagSetting["COLUMN"],
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BindNames: []string{fieldStruct.Name},
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EmbeddedBindNames: []string{fieldStruct.Name},
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FieldType: fieldStruct.Type,
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IndirectFieldType: fieldStruct.Type,
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StructField: fieldStruct,
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Tag: fieldStruct.Tag,
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TagSettings: tagSetting,
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Schema: schema,
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Creatable: true,
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Updatable: true,
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Readable: true,
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PrimaryKey: utils.CheckTruth(tagSetting["PRIMARYKEY"], tagSetting["PRIMARY_KEY"]),
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AutoIncrement: utils.CheckTruth(tagSetting["AUTOINCREMENT"]),
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AutoIncrementIncrement: DefaultAutoIncrementIncrement,
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}
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// Resolve pointer type
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for field.IndirectFieldType.Kind() == reflect.Ptr {
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field.IndirectFieldType = field.IndirectFieldType.Elem()
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}
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// Determine if field implements driver.Valuer
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fieldValue := reflect.New(field.IndirectFieldType)
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if valuer, isValuer := fieldValue.Interface().(driver.Valuer); isValuer {
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field.handleDriverValuer(valuer, fieldValue)
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}
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// Handle Serializers
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if serializerName := field.TagSettings["SERIALIZER"]; serializerName != "" {
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if serializer, ok := GetSerializer(serializerName); ok {
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field.DataType = String
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field.Serializer = serializer
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} else {
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schema.err = fmt.Errorf("invalid serializer type %v", serializerName)
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}
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}
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// Handle default settings like size, precision, etc.
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field.setAutoTime("AUTOCREATETIME")
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field.setAutoTime("AUTOUPDATETIME")
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// Handle size, precision, scale, and default value
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if num, ok := field.TagSettings["SIZE"]; ok {
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if size, err := strconv.Atoi(num); err == nil {
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field.Size = size
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} else {
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field.Size = -1
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}
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}
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if p, ok := field.TagSettings["PRECISION"]; ok {
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field.Precision, _ = strconv.Atoi(p)
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}
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if s, ok := field.TagSettings["SCALE"]; ok {
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field.Scale, _ = strconv.Atoi(s)
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}
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if v, ok := field.TagSettings["DEFAULT"]; ok {
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field.HasDefaultValue = true
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field.DefaultValue = strings.TrimSpace(v)
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if field.DefaultValue == "null" || field.DefaultValue == "" {
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field.HasDefaultValue = false
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}
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}
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// Set default value interface based on field type
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switch reflect.Indirect(fieldValue).Kind() {
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case reflect.Bool:
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field.DataType = Bool
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if field.HasDefaultValue {
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if field.DefaultValueInterface, err := strconv.ParseBool(field.DefaultValue); err != nil {
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schema.err = fmt.Errorf("failed to parse %s as default value for bool: %v", field.DefaultValue, err)
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}
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}
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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field.DataType = Int
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if field.HasDefaultValue {
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if field.DefaultValueInterface, err := strconv.ParseInt(field.DefaultValue, 0, 64); err != nil {
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schema.err = fmt.Errorf("failed to parse %s as default value for int: %v", field.DefaultValue, err)
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}
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}
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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field.DataType = Uint
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if field.HasDefaultValue {
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if field.DefaultValueInterface, err := strconv.ParseUint(field.DefaultValue, 0, 64); err != nil {
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schema.err = fmt.Errorf("failed to parse %s as default value for uint: %v", field.DefaultValue, err)
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}
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}
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case reflect.Float32, reflect.Float64:
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field.DataType = Float
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if field.HasDefaultValue {
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if field.DefaultValueInterface, err := strconv.ParseFloat(field.DefaultValue, 64); err != nil {
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schema.err = fmt.Errorf("failed to parse %s as default value for float: %v", field.DefaultValue, err)
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}
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}
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case reflect.String:
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field.DataType = String
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if field.HasDefaultValue {
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field.DefaultValueInterface = strings.Trim(field.DefaultValue, "'")
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}
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case reflect.Struct:
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if _, ok := fieldValue.Interface().(*time.Time); ok {
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field.DataType = Time
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} else if fieldValue.Type().ConvertibleTo(TimeReflectType) {
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field.DataType = Time
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} else if fieldValue.Type().ConvertibleTo(TimePtrReflectType) {
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field.DataType = Time
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}
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if field.HasDefaultValue && field.DataType == Time {
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if t, err := now.Parse(field.DefaultValue); err == nil {
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field.DefaultValueInterface = t
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}
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}
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case reflect.Array, reflect.Slice:
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if reflect.Indirect(fieldValue).Type().Elem() == ByteReflectType && field.DataType == "" {
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field.DataType = Bytes
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}
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}
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// Set permissions
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field.setupPermissions()
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// Handle Embedded fields
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field.handleEmbeddedField(fieldStruct, schema)
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return field
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}
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// Helper function to handle driver.Valuer interface for fields
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func (field *Field) handleDriverValuer(valuer driver.Valuer, fieldValue reflect.Value) {
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if _, ok := fieldValue.Interface().(GormDataTypeInterface); !ok {
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if v, err := valuer.Value(); reflect.ValueOf(v).IsValid() && err == nil {
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fieldValue = reflect.ValueOf(v)
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}
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field.extractRealFieldValue(fieldValue)
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}
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}
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// Helper function to recursively extract the actual value for complex types
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func (field *Field) extractRealFieldValue(v reflect.Value) {
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rv := reflect.Indirect(v)
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if rv.Kind() == reflect.Struct && !rv.Type().ConvertibleTo(TimeReflectType) {
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for i := 0; i < rv.NumField(); i++ {
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for key, value := range ParseTagSetting(rv.Type().Field(i).Tag.Get("gorm"), ";") {
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if _, ok := field.TagSettings[key]; !ok {
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field.TagSettings[key] = value
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}
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}
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}
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}
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}
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// Helper function to set up field permissions based on tag settings
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func (field *Field) setupPermissions() {
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if val, ok := field.TagSettings["-"]; ok {
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val = strings.ToLower(strings.TrimSpace(val))
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switch val {
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case "-":
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field.Creatable = false
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field.Updatable = false
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field.Readable = false
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field.DataType = ""
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case "all":
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field.Creatable = false
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field.Updatable = false
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field.Readable = false
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field.DataType = ""
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field.IgnoreMigration = true
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case "migration":
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field.IgnoreMigration = true
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}
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}
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if v, ok := field.TagSettings["->"]; ok {
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field.Creatable = false
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field.Updatable = false
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if strings.ToLower(v) == "false" {
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field.Readable = false
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} else {
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field.Readable = true
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}
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}
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if v, ok := field.TagSettings["<-"]; ok {
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field.Creatable = true
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field.Updatable = true
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if v != "<-" {
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if !strings.Contains(v, "create") {
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field.Creatable = false
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}
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if !strings.Contains(v, "update") {
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field.Updatable = false
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}
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}
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}
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}
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// Helper function to handle embedded fields
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func (field *Field) handleEmbeddedField(fieldStruct reflect.StructField, schema *Schema) {
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if _, ok := field.TagSettings["EMBEDDED"]; ok || (field.GORMDataType != Time && field.GORMDataType != Bytes && fieldStruct.Anonymous && (field.Creatable || field.Updatable || field.Readable)) {
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kind := reflect.Indirect(reflect.New(field.IndirectFieldType)).Kind()
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switch kind {
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case reflect.Struct:
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var err error
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field.Creatable = false
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field.Updatable = false
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field.Readable = false
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cacheStore := &sync.Map{}
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cacheStore.Store(embeddedCacheKey, true)
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if field.EmbeddedSchema, err = getOrParse(field.IndirectFieldType, cacheStore, embeddedNamer{Table: schema.Table, Namer: schema.namer}); err != nil {
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schema.err = err
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}
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for _, ef := range field.EmbeddedSchema.Fields {
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ef.Schema = schema
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ef.OwnerSchema = field.EmbeddedSchema
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ef.BindNames = append([]string{fieldStruct.Name}, ef.BindNames...)
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if _, ok := field.TagSettings["EMBEDDED"]; ok || !fieldStruct.Anonymous {
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ef.EmbeddedBindNames = append([]string{fieldStruct.Name}, ef.EmbeddedBindNames...)
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}
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// index is negative means is pointer
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if field.FieldType.Kind() == reflect.Struct {
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ef.StructField.Index = append([]int{fieldStruct.Index[0]}, ef.StructField.Index...)
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} else {
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ef.StructField.Index = append([]int{-fieldStruct.Index[0] - 1}, ef.StructField.Index...)
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}
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if prefix, ok := field.TagSettings["EMBEDDEDPREFIX"]; ok && ef.DBName != "" {
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ef.DBName = prefix + ef.DBName
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}
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if ef.PrimaryKey {
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if !utils.CheckTruth(ef.TagSettings["PRIMARYKEY"], ef.TagSettings["PRIMARY_KEY"]) {
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ef.PrimaryKey = false
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if val, ok := ef.TagSettings["AUTOINCREMENT"]; !ok || !utils.CheckTruth(val) {
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ef.AutoIncrement = false
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}
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if !ef.AutoIncrement && ef.DefaultValue == "" {
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ef.HasDefaultValue = false
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}
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}
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}
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for k, v := range field.TagSettings {
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ef.TagSettings[k] = v
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}
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}
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case reflect.Invalid, reflect.Uintptr, reflect.Array, reflect.Chan, reflect.Func, reflect.Interface,
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reflect.Map, reflect.Ptr, reflect.Slice, reflect.UnsafePointer, reflect.Complex64, reflect.Complex128:
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schema.err = fmt.Errorf("invalid embedded struct for %s's field %s, should be struct, but got %v", field.Schema.Name, field.Name, field.FieldType)
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}
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}
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}
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// Additional utility functions can be added as needed to maintain DRY and simplify the code.
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