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helpers.go
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/
helpers.go
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// Copyright (c) 2012 The gocql Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gocql
import (
"fmt"
"math/big"
"net"
"reflect"
"strings"
"time"
"gopkg.in/inf.v0"
)
type RowData struct {
Columns []string
Values []interface{}
}
func goType(t TypeInfo) reflect.Type {
switch t.Type() {
case TypeVarchar, TypeAscii, TypeInet, TypeText:
return reflect.TypeOf(*new(string))
case TypeBigInt, TypeCounter:
return reflect.TypeOf(*new(int64))
case TypeTime:
return reflect.TypeOf(*new(time.Duration))
case TypeTimestamp:
return reflect.TypeOf(*new(time.Time))
case TypeBlob:
return reflect.TypeOf(*new([]byte))
case TypeBoolean:
return reflect.TypeOf(*new(bool))
case TypeFloat:
return reflect.TypeOf(*new(float32))
case TypeDouble:
return reflect.TypeOf(*new(float64))
case TypeInt:
return reflect.TypeOf(*new(int))
case TypeSmallInt:
return reflect.TypeOf(*new(int16))
case TypeTinyInt:
return reflect.TypeOf(*new(int8))
case TypeDecimal:
return reflect.TypeOf(*new(*inf.Dec))
case TypeUUID, TypeTimeUUID:
return reflect.TypeOf(*new(UUID))
case TypeList, TypeSet:
return reflect.SliceOf(goType(t.(CollectionType).Elem))
case TypeMap:
return reflect.MapOf(goType(t.(CollectionType).Key), goType(t.(CollectionType).Elem))
case TypeVarint:
return reflect.TypeOf(*new(*big.Int))
case TypeTuple:
// what can we do here? all there is to do is to make a list of interface{}
tuple := t.(TupleTypeInfo)
return reflect.TypeOf(make([]interface{}, len(tuple.Elems)))
case TypeUDT:
return reflect.TypeOf(make(map[string]interface{}))
case TypeDate:
return reflect.TypeOf(*new(time.Time))
case TypeDuration:
return reflect.TypeOf(*new(Duration))
default:
return nil
}
}
func dereference(i interface{}) interface{} {
return reflect.Indirect(reflect.ValueOf(i)).Interface()
}
func getCassandraBaseType(name string) Type {
switch name {
case "ascii":
return TypeAscii
case "bigint":
return TypeBigInt
case "blob":
return TypeBlob
case "boolean":
return TypeBoolean
case "counter":
return TypeCounter
case "date":
return TypeDate
case "decimal":
return TypeDecimal
case "double":
return TypeDouble
case "duration":
return TypeDuration
case "float":
return TypeFloat
case "int":
return TypeInt
case "smallint":
return TypeSmallInt
case "tinyint":
return TypeTinyInt
case "time":
return TypeTime
case "timestamp":
return TypeTimestamp
case "uuid":
return TypeUUID
case "varchar":
return TypeVarchar
case "text":
return TypeText
case "varint":
return TypeVarint
case "timeuuid":
return TypeTimeUUID
case "inet":
return TypeInet
case "MapType":
return TypeMap
case "ListType":
return TypeList
case "SetType":
return TypeSet
case "TupleType":
return TypeTuple
default:
return TypeCustom
}
}
func getCassandraType(name string) TypeInfo {
if strings.HasPrefix(name, "frozen<") {
return getCassandraType(strings.TrimPrefix(name[:len(name)-1], "frozen<"))
} else if strings.HasPrefix(name, "set<") {
return CollectionType{
NativeType: NativeType{typ: TypeSet},
Elem: getCassandraType(strings.TrimPrefix(name[:len(name)-1], "set<")),
}
} else if strings.HasPrefix(name, "list<") {
return CollectionType{
NativeType: NativeType{typ: TypeList},
Elem: getCassandraType(strings.TrimPrefix(name[:len(name)-1], "list<")),
}
} else if strings.HasPrefix(name, "map<") {
names := splitCompositeTypes(strings.TrimPrefix(name[:len(name)-1], "map<"))
if len(names) != 2 {
Logger.Printf("Error parsing map type, it has %d subelements, expecting 2\n", len(names))
return NativeType{
typ: TypeCustom,
}
}
return CollectionType{
NativeType: NativeType{typ: TypeMap},
Key: getCassandraType(names[0]),
Elem: getCassandraType(names[1]),
}
} else if strings.HasPrefix(name, "tuple<") {
names := splitCompositeTypes(strings.TrimPrefix(name[:len(name)-1], "tuple<"))
types := make([]TypeInfo, len(names))
for i, name := range names {
types[i] = getCassandraType(name)
}
return TupleTypeInfo{
NativeType: NativeType{typ: TypeTuple},
Elems: types,
}
} else {
return NativeType{
typ: getCassandraBaseType(name),
}
}
}
func splitCompositeTypes(name string) []string {
if !strings.Contains(name, "<") {
return strings.Split(name, ", ")
}
var parts []string
lessCount := 0
segment := ""
for _, char := range name {
if char == ',' && lessCount == 0 {
if segment != "" {
parts = append(parts, strings.TrimSpace(segment))
}
segment = ""
continue
}
segment += string(char)
if char == '<' {
lessCount++
} else if char == '>' {
lessCount--
}
}
if segment != "" {
parts = append(parts, strings.TrimSpace(segment))
}
return parts
}
func apacheToCassandraType(t string) string {
t = strings.Replace(t, apacheCassandraTypePrefix, "", -1)
t = strings.Replace(t, "(", "<", -1)
t = strings.Replace(t, ")", ">", -1)
types := strings.FieldsFunc(t, func(r rune) bool {
return r == '<' || r == '>' || r == ','
})
for _, typ := range types {
t = strings.Replace(t, typ, getApacheCassandraType(typ).String(), -1)
}
// This is done so it exactly matches what Cassandra returns
return strings.Replace(t, ",", ", ", -1)
}
func getApacheCassandraType(class string) Type {
switch strings.TrimPrefix(class, apacheCassandraTypePrefix) {
case "AsciiType":
return TypeAscii
case "LongType":
return TypeBigInt
case "BytesType":
return TypeBlob
case "BooleanType":
return TypeBoolean
case "CounterColumnType":
return TypeCounter
case "DecimalType":
return TypeDecimal
case "DoubleType":
return TypeDouble
case "FloatType":
return TypeFloat
case "Int32Type":
return TypeInt
case "ShortType":
return TypeSmallInt
case "ByteType":
return TypeTinyInt
case "TimeType":
return TypeTime
case "DateType", "TimestampType":
return TypeTimestamp
case "UUIDType", "LexicalUUIDType":
return TypeUUID
case "UTF8Type":
return TypeVarchar
case "IntegerType":
return TypeVarint
case "TimeUUIDType":
return TypeTimeUUID
case "InetAddressType":
return TypeInet
case "MapType":
return TypeMap
case "ListType":
return TypeList
case "SetType":
return TypeSet
case "TupleType":
return TypeTuple
case "DurationType":
return TypeDuration
default:
return TypeCustom
}
}
func typeCanBeNull(typ TypeInfo) bool {
switch typ.(type) {
case CollectionType, UDTTypeInfo, TupleTypeInfo:
return false
}
return true
}
func (r *RowData) rowMap(m map[string]interface{}) {
for i, column := range r.Columns {
val := dereference(r.Values[i])
if valVal := reflect.ValueOf(val); valVal.Kind() == reflect.Slice {
valCopy := reflect.MakeSlice(valVal.Type(), valVal.Len(), valVal.Cap())
reflect.Copy(valCopy, valVal)
m[column] = valCopy.Interface()
} else {
m[column] = val
}
}
}
// TupeColumnName will return the column name of a tuple value in a column named
// c at index n. It should be used if a specific element within a tuple is needed
// to be extracted from a map returned from SliceMap or MapScan.
func TupleColumnName(c string, n int) string {
return fmt.Sprintf("%s[%d]", c, n)
}
func (iter *Iter) RowData() (RowData, error) {
if iter.err != nil {
return RowData{}, iter.err
}
columns := make([]string, 0, len(iter.Columns()))
values := make([]interface{}, 0, len(iter.Columns()))
for _, column := range iter.Columns() {
if c, ok := column.TypeInfo.(TupleTypeInfo); !ok {
val := column.TypeInfo.New()
columns = append(columns, column.Name)
values = append(values, val)
} else {
for i, elem := range c.Elems {
columns = append(columns, TupleColumnName(column.Name, i))
values = append(values, elem.New())
}
}
}
rowData := RowData{
Columns: columns,
Values: values,
}
return rowData, nil
}
// TODO(zariel): is it worth exporting this?
func (iter *Iter) rowMap() (map[string]interface{}, error) {
if iter.err != nil {
return nil, iter.err
}
rowData, _ := iter.RowData()
iter.Scan(rowData.Values...)
m := make(map[string]interface{}, len(rowData.Columns))
rowData.rowMap(m)
return m, nil
}
// SliceMap is a helper function to make the API easier to use
// returns the data from the query in the form of []map[string]interface{}
func (iter *Iter) SliceMap() ([]map[string]interface{}, error) {
if iter.err != nil {
return nil, iter.err
}
// Not checking for the error because we just did
rowData, _ := iter.RowData()
dataToReturn := make([]map[string]interface{}, 0)
for iter.Scan(rowData.Values...) {
m := make(map[string]interface{}, len(rowData.Columns))
rowData.rowMap(m)
dataToReturn = append(dataToReturn, m)
}
if iter.err != nil {
return nil, iter.err
}
return dataToReturn, nil
}
// MapScan takes a map[string]interface{} and populates it with a row
// that is returned from cassandra.
//
// Each call to MapScan() must be called with a new map object.
// During the call to MapScan() any pointers in the existing map
// are replaced with non pointer types before the call returns
//
// iter := session.Query(`SELECT * FROM mytable`).Iter()
// for {
// // New map each iteration
// row = make(map[string]interface{})
// if !iter.MapScan(row) {
// break
// }
// // Do things with row
// if fullname, ok := row["fullname"]; ok {
// fmt.Printf("Full Name: %s\n", fullname)
// }
// }
//
// You can also pass pointers in the map before each call
//
// var fullName FullName // Implements gocql.Unmarshaler and gocql.Marshaler interfaces
// var address net.IP
// var age int
// iter := session.Query(`SELECT * FROM scan_map_table`).Iter()
// for {
// // New map each iteration
// row := map[string]interface{}{
// "fullname": &fullName,
// "age": &age,
// "address": &address,
// }
// if !iter.MapScan(row) {
// break
// }
// fmt.Printf("First: %s Age: %d Address: %q\n", fullName.FirstName, age, address)
// }
func (iter *Iter) MapScan(m map[string]interface{}) bool {
if iter.err != nil {
return false
}
// Not checking for the error because we just did
rowData, _ := iter.RowData()
for i, col := range rowData.Columns {
if dest, ok := m[col]; ok {
rowData.Values[i] = dest
}
}
if iter.Scan(rowData.Values...) {
rowData.rowMap(m)
return true
}
return false
}
func copyBytes(p []byte) []byte {
b := make([]byte, len(p))
copy(b, p)
return b
}
var failDNS = false
func LookupIP(host string) ([]net.IP, error) {
if failDNS {
return nil, &net.DNSError{}
}
return net.LookupIP(host)
}