bf51655a7b
Signed-off-by: Jacek J. Łakis <jacek.lakis@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
321 lines
10 KiB
Go
321 lines
10 KiB
Go
/*
|
|
Copyright 2017 Google Inc. All Rights Reserved.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package spanner
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"time"
|
|
|
|
"google.golang.org/grpc/codes"
|
|
|
|
"cloud.google.com/go/civil"
|
|
proto3 "github.com/golang/protobuf/ptypes/struct"
|
|
sppb "google.golang.org/genproto/googleapis/spanner/v1"
|
|
)
|
|
|
|
// A Key can be either a Cloud Spanner row's primary key or a secondary index key.
|
|
// It is essentially an interface{} array, which represents a set of Cloud Spanner
|
|
// columns. A Key type has the following usages:
|
|
//
|
|
// - Used as primary key which uniquely identifies a Cloud Spanner row.
|
|
// - Used as secondary index key which maps to a set of Cloud Spanner rows
|
|
// indexed under it.
|
|
// - Used as endpoints of primary key/secondary index ranges,
|
|
// see also the KeyRange type.
|
|
//
|
|
// Rows that are identified by the Key type are outputs of read operation or targets of
|
|
// delete operation in a mutation. Note that for Insert/Update/InsertOrUpdate/Update
|
|
// mutation types, although they don't require a primary key explicitly, the column list
|
|
// provided must contain enough columns that can comprise a primary key.
|
|
//
|
|
// Keys are easy to construct. For example, suppose you have a table with a
|
|
// primary key of username and product ID. To make a key for this table:
|
|
//
|
|
// key := spanner.Key{"john", 16}
|
|
//
|
|
// See the description of Row and Mutation types for how Go types are
|
|
// mapped to Cloud Spanner types. For convenience, Key type supports a wide range
|
|
// of Go types:
|
|
// - int, int8, int16, int32, int64, and NullInt64 are mapped to Cloud Spanner's INT64 type.
|
|
// - uint8, uint16 and uint32 are also mapped to Cloud Spanner's INT64 type.
|
|
// - float32, float64, NullFloat64 are mapped to Cloud Spanner's FLOAT64 type.
|
|
// - bool and NullBool are mapped to Cloud Spanner's BOOL type.
|
|
// - []byte is mapped to Cloud Spanner's BYTES type.
|
|
// - string and NullString are mapped to Cloud Spanner's STRING type.
|
|
// - time.Time and NullTime are mapped to Cloud Spanner's TIMESTAMP type.
|
|
// - civil.Date and NullDate are mapped to Cloud Spanner's DATE type.
|
|
type Key []interface{}
|
|
|
|
// errInvdKeyPartType returns error for unsupported key part type.
|
|
func errInvdKeyPartType(part interface{}) error {
|
|
return spannerErrorf(codes.InvalidArgument, "key part has unsupported type %T", part)
|
|
}
|
|
|
|
// keyPartValue converts a part of the Key (which is a valid Cloud Spanner type)
|
|
// into a proto3.Value. Used for encoding Key type into protobuf.
|
|
func keyPartValue(part interface{}) (pb *proto3.Value, err error) {
|
|
switch v := part.(type) {
|
|
case int:
|
|
pb, _, err = encodeValue(int64(v))
|
|
case int8:
|
|
pb, _, err = encodeValue(int64(v))
|
|
case int16:
|
|
pb, _, err = encodeValue(int64(v))
|
|
case int32:
|
|
pb, _, err = encodeValue(int64(v))
|
|
case uint8:
|
|
pb, _, err = encodeValue(int64(v))
|
|
case uint16:
|
|
pb, _, err = encodeValue(int64(v))
|
|
case uint32:
|
|
pb, _, err = encodeValue(int64(v))
|
|
case float32:
|
|
pb, _, err = encodeValue(float64(v))
|
|
case int64, float64, NullInt64, NullFloat64, bool, NullBool, []byte, string, NullString, time.Time, civil.Date, NullTime, NullDate:
|
|
pb, _, err = encodeValue(v)
|
|
default:
|
|
return nil, errInvdKeyPartType(v)
|
|
}
|
|
return pb, err
|
|
}
|
|
|
|
// proto converts a spanner.Key into a proto3.ListValue.
|
|
func (key Key) proto() (*proto3.ListValue, error) {
|
|
lv := &proto3.ListValue{}
|
|
lv.Values = make([]*proto3.Value, 0, len(key))
|
|
for _, part := range key {
|
|
v, err := keyPartValue(part)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
lv.Values = append(lv.Values, v)
|
|
}
|
|
return lv, nil
|
|
}
|
|
|
|
// String implements fmt.Stringer for Key. For string, []byte and NullString, it
|
|
// prints the uninterpreted bytes of their contents, leaving caller with the
|
|
// opportunity to escape the output.
|
|
func (key Key) String() string {
|
|
b := &bytes.Buffer{}
|
|
fmt.Fprint(b, "(")
|
|
for i, part := range []interface{}(key) {
|
|
if i != 0 {
|
|
fmt.Fprint(b, ",")
|
|
}
|
|
switch v := part.(type) {
|
|
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, float32, float64, bool:
|
|
// Use %v to print numeric types and bool.
|
|
fmt.Fprintf(b, "%v", v)
|
|
case string:
|
|
fmt.Fprintf(b, "%q", v)
|
|
case []byte:
|
|
if v != nil {
|
|
fmt.Fprintf(b, "%q", v)
|
|
} else {
|
|
fmt.Fprint(b, "<null>")
|
|
}
|
|
case NullInt64, NullFloat64, NullBool, NullString, NullTime, NullDate:
|
|
// The above types implement fmt.Stringer.
|
|
fmt.Fprintf(b, "%s", v)
|
|
case civil.Date:
|
|
fmt.Fprintf(b, "%q", v)
|
|
case time.Time:
|
|
fmt.Fprintf(b, "%q", v.Format(time.RFC3339Nano))
|
|
default:
|
|
fmt.Fprintf(b, "%v", v)
|
|
}
|
|
}
|
|
fmt.Fprint(b, ")")
|
|
return b.String()
|
|
}
|
|
|
|
// KeyRangeKind describes the kind of interval represented by a KeyRange:
|
|
// whether it is open or closed on the left and right.
|
|
type KeyRangeKind int
|
|
|
|
const (
|
|
// ClosedOpen is closed on the left and open on the right: the Start
|
|
// key is included, the End key is excluded.
|
|
ClosedOpen KeyRangeKind = iota
|
|
|
|
// ClosedClosed is closed on the left and the right: both keys are included.
|
|
ClosedClosed
|
|
|
|
// OpenClosed is open on the left and closed on the right: the Start
|
|
// key is excluded, the End key is included.
|
|
OpenClosed
|
|
|
|
// OpenOpen is open on the left and the right: neither key is included.
|
|
OpenOpen
|
|
)
|
|
|
|
// A KeyRange represents a range of rows in a table or index.
|
|
//
|
|
// A range has a Start key and an End key. IncludeStart and IncludeEnd
|
|
// indicate whether the Start and End keys are included in the range.
|
|
//
|
|
// For example, consider the following table definition:
|
|
//
|
|
// CREATE TABLE UserEvents (
|
|
// UserName STRING(MAX),
|
|
// EventDate STRING(10),
|
|
// ) PRIMARY KEY(UserName, EventDate);
|
|
//
|
|
// The following keys name rows in this table:
|
|
//
|
|
// spanner.Key{"Bob", "2014-09-23"}
|
|
// spanner.Key{"Alfred", "2015-06-12"}
|
|
//
|
|
// Since the UserEvents table's PRIMARY KEY clause names two columns, each
|
|
// UserEvents key has two elements; the first is the UserName, and the second
|
|
// is the EventDate.
|
|
//
|
|
// Key ranges with multiple components are interpreted lexicographically by
|
|
// component using the table or index key's declared sort order. For example,
|
|
// the following range returns all events for user "Bob" that occurred in the
|
|
// year 2015:
|
|
//
|
|
// spanner.KeyRange{
|
|
// Start: spanner.Key{"Bob", "2015-01-01"},
|
|
// End: spanner.Key{"Bob", "2015-12-31"},
|
|
// Kind: ClosedClosed,
|
|
// }
|
|
//
|
|
// Start and end keys can omit trailing key components. This affects the
|
|
// inclusion and exclusion of rows that exactly match the provided key
|
|
// components: if IncludeStart is true, then rows that exactly match the
|
|
// provided components of the Start key are included; if IncludeStart is false
|
|
// then rows that exactly match are not included. IncludeEnd and End key
|
|
// behave in the same fashion.
|
|
//
|
|
// For example, the following range includes all events for "Bob" that occurred
|
|
// during and after the year 2000:
|
|
//
|
|
// spanner.KeyRange{
|
|
// Start: spanner.Key{"Bob", "2000-01-01"},
|
|
// End: spanner.Key{"Bob"},
|
|
// Kind: ClosedClosed,
|
|
// }
|
|
//
|
|
// The next example retrieves all events for "Bob":
|
|
//
|
|
// spanner.PrefixRange(spanner.Key{"Bob"})
|
|
//
|
|
// To retrieve events before the year 2000:
|
|
//
|
|
// spanner.KeyRange{
|
|
// Start: spanner.Key{"Bob"},
|
|
// End: spanner.Key{"Bob", "2000-01-01"},
|
|
// Kind: ClosedOpen,
|
|
// }
|
|
//
|
|
// Although we specified a Kind for this KeyRange, we didn't need to, because
|
|
// the default is ClosedOpen. In later examples we'll omit Kind if it is
|
|
// ClosedOpen.
|
|
//
|
|
// The following range includes all rows in a table or under a
|
|
// index:
|
|
//
|
|
// spanner.AllKeys()
|
|
//
|
|
// This range returns all users whose UserName begins with any
|
|
// character from A to C:
|
|
//
|
|
// spanner.KeyRange{
|
|
// Start: spanner.Key{"A"},
|
|
// End: spanner.Key{"D"},
|
|
// }
|
|
//
|
|
// This range returns all users whose UserName begins with B:
|
|
//
|
|
// spanner.KeyRange{
|
|
// Start: spanner.Key{"B"},
|
|
// End: spanner.Key{"C"},
|
|
// }
|
|
//
|
|
// Key ranges honor column sort order. For example, suppose a table is defined
|
|
// as follows:
|
|
//
|
|
// CREATE TABLE DescendingSortedTable {
|
|
// Key INT64,
|
|
// ...
|
|
// ) PRIMARY KEY(Key DESC);
|
|
//
|
|
// The following range retrieves all rows with key values between 1 and 100
|
|
// inclusive:
|
|
//
|
|
// spanner.KeyRange{
|
|
// Start: spanner.Key{100},
|
|
// End: spanner.Key{1},
|
|
// Kind: ClosedClosed,
|
|
// }
|
|
//
|
|
// Note that 100 is passed as the start, and 1 is passed as the end, because
|
|
// Key is a descending column in the schema.
|
|
type KeyRange struct {
|
|
// Start specifies the left boundary of the key range; End specifies
|
|
// the right boundary of the key range.
|
|
Start, End Key
|
|
|
|
// Kind describes whether the boundaries of the key range include
|
|
// their keys.
|
|
Kind KeyRangeKind
|
|
}
|
|
|
|
// String implements fmt.Stringer for KeyRange type.
|
|
func (r KeyRange) String() string {
|
|
var left, right string
|
|
switch r.Kind {
|
|
case ClosedClosed:
|
|
left, right = "[", "]"
|
|
case ClosedOpen:
|
|
left, right = "[", ")"
|
|
case OpenClosed:
|
|
left, right = "(", "]"
|
|
case OpenOpen:
|
|
left, right = "(", ")"
|
|
default:
|
|
left, right = "?", "?"
|
|
}
|
|
return fmt.Sprintf("%s%s,%s%s", left, r.Start, r.End, right)
|
|
}
|
|
|
|
// proto converts KeyRange into sppb.KeyRange.
|
|
func (r KeyRange) proto() (*sppb.KeyRange, error) {
|
|
var err error
|
|
var start, end *proto3.ListValue
|
|
pb := &sppb.KeyRange{}
|
|
if start, err = r.Start.proto(); err != nil {
|
|
return nil, err
|
|
}
|
|
if end, err = r.End.proto(); err != nil {
|
|
return nil, err
|
|
}
|
|
if r.Kind == ClosedClosed || r.Kind == ClosedOpen {
|
|
pb.StartKeyType = &sppb.KeyRange_StartClosed{StartClosed: start}
|
|
} else {
|
|
pb.StartKeyType = &sppb.KeyRange_StartOpen{StartOpen: start}
|
|
}
|
|
if r.Kind == ClosedClosed || r.Kind == OpenClosed {
|
|
pb.EndKeyType = &sppb.KeyRange_EndClosed{EndClosed: end}
|
|
} else {
|
|
pb.EndKeyType = &sppb.KeyRange_EndOpen{EndOpen: end}
|
|
}
|
|
return pb, nil
|
|
}
|