365 lines
7.6 KiB
Go
365 lines
7.6 KiB
Go
package pgdialect
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import (
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"database/sql/driver"
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"encoding/hex"
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"fmt"
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"reflect"
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"strconv"
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"time"
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"unicode/utf8"
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"github.com/uptrace/bun/dialect"
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"github.com/uptrace/bun/schema"
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)
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var (
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driverValuerType = reflect.TypeOf((*driver.Valuer)(nil)).Elem()
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stringType = reflect.TypeOf((*string)(nil)).Elem()
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sliceStringType = reflect.TypeOf([]string(nil))
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intType = reflect.TypeOf((*int)(nil)).Elem()
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sliceIntType = reflect.TypeOf([]int(nil))
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int64Type = reflect.TypeOf((*int64)(nil)).Elem()
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sliceInt64Type = reflect.TypeOf([]int64(nil))
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float64Type = reflect.TypeOf((*float64)(nil)).Elem()
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sliceFloat64Type = reflect.TypeOf([]float64(nil))
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)
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func arrayAppend(fmter schema.Formatter, b []byte, v interface{}) []byte {
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switch v := v.(type) {
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case int64:
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return strconv.AppendInt(b, v, 10)
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case float64:
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return dialect.AppendFloat64(b, v)
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case bool:
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return dialect.AppendBool(b, v)
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case []byte:
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return arrayAppendBytes(b, v)
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case string:
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return arrayAppendString(b, v)
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case time.Time:
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return fmter.Dialect().AppendTime(b, v)
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default:
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err := fmt.Errorf("pgdialect: can't append %T", v)
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return dialect.AppendError(b, err)
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}
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}
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func arrayAppendStringValue(fmter schema.Formatter, b []byte, v reflect.Value) []byte {
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return arrayAppendString(b, v.String())
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}
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func arrayAppendBytesValue(fmter schema.Formatter, b []byte, v reflect.Value) []byte {
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return arrayAppendBytes(b, v.Bytes())
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}
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func arrayAppendDriverValue(fmter schema.Formatter, b []byte, v reflect.Value) []byte {
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iface, err := v.Interface().(driver.Valuer).Value()
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if err != nil {
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return dialect.AppendError(b, err)
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}
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return arrayAppend(fmter, b, iface)
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}
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//------------------------------------------------------------------------------
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func (d *Dialect) arrayAppender(typ reflect.Type) schema.AppenderFunc {
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kind := typ.Kind()
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switch kind {
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case reflect.Ptr:
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if fn := d.arrayAppender(typ.Elem()); fn != nil {
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return schema.PtrAppender(fn)
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}
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case reflect.Slice, reflect.Array:
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// ok:
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default:
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return nil
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}
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elemType := typ.Elem()
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if kind == reflect.Slice {
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switch elemType {
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case stringType:
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return appendStringSliceValue
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case intType:
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return appendIntSliceValue
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case int64Type:
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return appendInt64SliceValue
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case float64Type:
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return appendFloat64SliceValue
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}
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}
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appendElem := d.arrayElemAppender(elemType)
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if appendElem == nil {
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panic(fmt.Errorf("pgdialect: %s is not supported", typ))
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}
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return func(fmter schema.Formatter, b []byte, v reflect.Value) []byte {
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kind := v.Kind()
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switch kind {
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case reflect.Ptr, reflect.Slice:
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if v.IsNil() {
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return dialect.AppendNull(b)
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}
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}
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if kind == reflect.Ptr {
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v = v.Elem()
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}
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b = append(b, '\'')
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b = append(b, '{')
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for i := 0; i < v.Len(); i++ {
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elem := v.Index(i)
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b = appendElem(fmter, b, elem)
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b = append(b, ',')
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}
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if v.Len() > 0 {
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b[len(b)-1] = '}' // Replace trailing comma.
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} else {
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b = append(b, '}')
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}
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b = append(b, '\'')
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return b
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}
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}
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func (d *Dialect) arrayElemAppender(typ reflect.Type) schema.AppenderFunc {
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if typ.Implements(driverValuerType) {
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return arrayAppendDriverValue
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}
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switch typ.Kind() {
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case reflect.String:
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return arrayAppendStringValue
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case reflect.Slice:
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if typ.Elem().Kind() == reflect.Uint8 {
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return arrayAppendBytesValue
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}
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}
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return schema.Appender(d, typ)
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}
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func appendStringSliceValue(fmter schema.Formatter, b []byte, v reflect.Value) []byte {
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ss := v.Convert(sliceStringType).Interface().([]string)
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return appendStringSlice(b, ss)
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}
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func appendStringSlice(b []byte, ss []string) []byte {
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if ss == nil {
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return dialect.AppendNull(b)
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}
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b = append(b, '\'')
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b = append(b, '{')
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for _, s := range ss {
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b = arrayAppendString(b, s)
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b = append(b, ',')
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}
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if len(ss) > 0 {
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b[len(b)-1] = '}' // Replace trailing comma.
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} else {
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b = append(b, '}')
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}
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b = append(b, '\'')
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return b
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}
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func appendIntSliceValue(fmter schema.Formatter, b []byte, v reflect.Value) []byte {
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ints := v.Convert(sliceIntType).Interface().([]int)
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return appendIntSlice(b, ints)
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}
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func appendIntSlice(b []byte, ints []int) []byte {
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if ints == nil {
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return dialect.AppendNull(b)
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}
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b = append(b, '\'')
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b = append(b, '{')
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for _, n := range ints {
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b = strconv.AppendInt(b, int64(n), 10)
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b = append(b, ',')
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}
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if len(ints) > 0 {
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b[len(b)-1] = '}' // Replace trailing comma.
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} else {
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b = append(b, '}')
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}
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b = append(b, '\'')
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return b
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}
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func appendInt64SliceValue(fmter schema.Formatter, b []byte, v reflect.Value) []byte {
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ints := v.Convert(sliceInt64Type).Interface().([]int64)
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return appendInt64Slice(b, ints)
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}
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func appendInt64Slice(b []byte, ints []int64) []byte {
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if ints == nil {
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return dialect.AppendNull(b)
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}
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b = append(b, '\'')
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b = append(b, '{')
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for _, n := range ints {
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b = strconv.AppendInt(b, n, 10)
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b = append(b, ',')
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}
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if len(ints) > 0 {
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b[len(b)-1] = '}' // Replace trailing comma.
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} else {
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b = append(b, '}')
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}
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b = append(b, '\'')
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return b
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}
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func appendFloat64SliceValue(fmter schema.Formatter, b []byte, v reflect.Value) []byte {
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floats := v.Convert(sliceFloat64Type).Interface().([]float64)
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return appendFloat64Slice(b, floats)
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}
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func appendFloat64Slice(b []byte, floats []float64) []byte {
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if floats == nil {
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return dialect.AppendNull(b)
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}
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b = append(b, '\'')
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b = append(b, '{')
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for _, n := range floats {
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b = dialect.AppendFloat64(b, n)
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b = append(b, ',')
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}
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if len(floats) > 0 {
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b[len(b)-1] = '}' // Replace trailing comma.
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} else {
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b = append(b, '}')
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}
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b = append(b, '\'')
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return b
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}
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//------------------------------------------------------------------------------
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func arrayAppendBytes(b []byte, bs []byte) []byte {
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if bs == nil {
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return dialect.AppendNull(b)
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}
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b = append(b, `"\\x`...)
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s := len(b)
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b = append(b, make([]byte, hex.EncodedLen(len(bs)))...)
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hex.Encode(b[s:], bs)
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b = append(b, '"')
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return b
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}
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func arrayAppendString(b []byte, s string) []byte {
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b = append(b, '"')
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for _, r := range s {
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switch r {
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case 0:
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// ignore
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case '\'':
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b = append(b, "''"...)
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case '"':
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b = append(b, '\\', '"')
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case '\\':
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b = append(b, '\\', '\\')
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default:
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if r < utf8.RuneSelf {
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b = append(b, byte(r))
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break
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}
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l := len(b)
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if cap(b)-l < utf8.UTFMax {
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b = append(b, make([]byte, utf8.UTFMax)...)
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}
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n := utf8.EncodeRune(b[l:l+utf8.UTFMax], r)
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b = b[:l+n]
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}
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}
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b = append(b, '"')
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return b
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}
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//------------------------------------------------------------------------------
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var mapStringStringType = reflect.TypeOf(map[string]string(nil))
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func (d *Dialect) hstoreAppender(typ reflect.Type) schema.AppenderFunc {
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kind := typ.Kind()
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switch kind {
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case reflect.Ptr:
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if fn := d.hstoreAppender(typ.Elem()); fn != nil {
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return schema.PtrAppender(fn)
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}
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case reflect.Map:
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// ok:
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default:
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return nil
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}
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if typ.Key() == stringType && typ.Elem() == stringType {
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return appendMapStringStringValue
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}
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return func(fmter schema.Formatter, b []byte, v reflect.Value) []byte {
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err := fmt.Errorf("bun: Hstore(unsupported %s)", v.Type())
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return dialect.AppendError(b, err)
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}
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}
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func appendMapStringString(b []byte, m map[string]string) []byte {
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if m == nil {
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return dialect.AppendNull(b)
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}
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b = append(b, '\'')
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for key, value := range m {
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b = arrayAppendString(b, key)
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b = append(b, '=', '>')
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b = arrayAppendString(b, value)
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b = append(b, ',')
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}
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if len(m) > 0 {
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b = b[:len(b)-1] // Strip trailing comma.
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}
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b = append(b, '\'')
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return b
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}
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func appendMapStringStringValue(fmter schema.Formatter, b []byte, v reflect.Value) []byte {
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m := v.Convert(mapStringStringType).Interface().(map[string]string)
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return appendMapStringString(b, m)
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}
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