github.com/willyham/dosa@v2.3.1-0.20171024181418-1e446d37ee71+incompatible/type.go (about) 1 // Copyright (c) 2017 Uber Technologies, Inc. 2 // 3 // Permission is hereby granted, free of charge, to any person obtaining a copy 4 // of this software and associated documentation files (the "Software"), to deal 5 // in the Software without restriction, including without limitation the rights 6 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 // copies of the Software, and to permit persons to whom the Software is 8 // furnished to do so, subject to the following conditions: 9 // 10 // The above copyright notice and this permission notice shall be included in 11 // all copies or substantial portions of the Software. 12 // 13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 19 // THE SOFTWARE. 20 21 package dosa 22 23 import ( 24 "github.com/pkg/errors" 25 "github.com/satori/go.uuid" 26 ) 27 28 //go:generate stringer -type=Type 29 30 // Type defines a data type for an entity field 31 type Type int 32 33 const ( 34 // Invalid type to be used as zero value for Type 35 Invalid Type = iota 36 37 // TUUID is different from dosa.UUID 38 TUUID 39 40 // String represents a string 41 String 42 43 // Int32 represents an int32 44 Int32 45 46 // Int64 represents either an int64 or a regular int 47 Int64 48 49 // Double is a float64 50 Double 51 52 // Blob is a byte slice 53 Blob 54 55 // Timestamp is a time.Time 56 Timestamp 57 58 // Bool is a bool type 59 Bool 60 ) 61 62 // UUID stores a string format of uuid. 63 // Validation is done before saving to datastore. 64 // The format of uuid used in datastore is orthogonal to the string format here. 65 type UUID string 66 67 // NewUUID is a helper for returning a new dosa.UUID value 68 func NewUUID() UUID { 69 return UUID(uuid.NewV4().String()) 70 } 71 72 // Bytes gets the bytes from a UUID 73 func (u UUID) Bytes() ([]byte, error) { 74 id, err := uuid.FromString(string(u)) 75 if err != nil { 76 return nil, errors.Wrap(err, "invalid uuid string") 77 } 78 return id.Bytes(), nil 79 } 80 81 // BytesToUUID creates a UUID from a byte slice 82 func BytesToUUID(bs []byte) (UUID, error) { 83 id, err := uuid.FromBytes(bs) 84 if err != nil { 85 return "", errors.Wrap(err, "invalid uuid bytes") 86 } 87 return UUID(id.String()), nil 88 } 89 90 // FromString converts string to dosa Type 91 func FromString(s string) Type { 92 switch s { 93 case TUUID.String(): 94 return TUUID 95 case String.String(): 96 return String 97 case Int32.String(): 98 return Int32 99 case Int64.String(): 100 return Int64 101 case Double.String(): 102 return Double 103 case Blob.String(): 104 return Blob 105 case Timestamp.String(): 106 return Timestamp 107 case Bool.String(): 108 return Bool 109 default: 110 return Invalid 111 } 112 } 113 114 func isInvalidPrimaryKeyType(c *ColumnDefinition) bool { 115 if c.IsPointer { 116 return true 117 } 118 119 switch c.Type { 120 case Invalid: 121 return true 122 default: 123 return false 124 } 125 }