-
Notifications
You must be signed in to change notification settings - Fork 0
/
tables.go
327 lines (258 loc) · 7.79 KB
/
tables.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
package metadata
import (
"github.com/pkg/errors"
"github.com/unhandled-exception/sophiadb/internal/pkg/records"
"github.com/unhandled-exception/sophiadb/internal/pkg/scan"
)
const (
MaxTableNameLength = 32
TableCatalogTableName = "sdb_tables"
fieldsCatalogTableName = "sbb_tables_fields"
TcatTableNameField = "tblname"
TcatSlotsizeField = "slotsize"
FcatTableNameField = "tblname"
FcatFieldNameField = "fldname"
FcatTypeField = "type"
FcatLengthField = "length"
FcatOffsetField = "offset"
)
type Tables struct {
TcatTable string
FcatTable string
TcatLayout records.Layout
FcatLayout records.Layout
}
func NewTables(isNew bool, trx scan.TRXInt) (*Tables, error) {
t := &Tables{
TcatTable: TableCatalogTableName,
FcatTable: fieldsCatalogTableName,
TcatLayout: newTablesCatalogLayout(),
FcatLayout: newFieldsCatalogLayout(),
}
if isNew {
if err := t.CreateTable(t.TcatTable, t.TcatLayout.Schema, trx); err != nil {
return nil, t.wrapError(err, "", nil)
}
if err := t.CreateTable(t.FcatTable, t.FcatLayout.Schema, trx); err != nil {
return nil, t.wrapError(err, "", nil)
}
}
return t, nil
}
func newTablesCatalogLayout() records.Layout {
schema := records.NewSchema()
schema.AddStringField(TcatTableNameField, MaxTableNameLength)
schema.AddInt64Field(TcatSlotsizeField)
return records.NewLayout(schema)
}
func newFieldsCatalogLayout() records.Layout {
schema := records.NewSchema()
schema.AddStringField(FcatTableNameField, MaxTableNameLength)
schema.AddStringField(FcatFieldNameField, MaxTableNameLength)
schema.AddInt8Field(FcatTypeField)
schema.AddInt64Field(FcatLengthField)
schema.AddInt64Field(FcatOffsetField)
return records.NewLayout(schema)
}
func (t *Tables) TableExists(tableName string, trx scan.TRXInt) (stop bool, err error) {
tcat, err := t.NewTableCatalogTableScan(trx)
if err != nil {
return false, t.wrapError(err, tableName, nil)
}
found := false
err = scan.ForEach(tcat, func() (stop bool, err error) {
name, verr := tcat.GetString(TcatTableNameField)
if verr != nil {
return true, verr
}
found = (name == tableName)
return found, nil
})
return found, t.wrapError(err, tableName, nil)
}
func (t *Tables) CreateTable(tableName string, schema records.Schema, trx scan.TRXInt) error {
tableExists, err := t.TableExists(tableName, trx)
if tableExists || err != nil {
if err != nil {
return t.wrapError(err, tableName, ErrFailedToCreateTable)
}
if tableExists {
return ErrTableExists
}
}
tcat, fcat, err := t.NewCatalogTableScan(trx)
if err != nil {
return t.wrapError(err, tableName, ErrFailedToCreateTable)
}
defer tcat.Close()
defer fcat.Close()
layout := records.NewLayout(schema)
if err := tcat.Insert(); err != nil {
return t.wrapError(err, tableName, ErrFailedToCreateTable)
}
if err := scan.ForEachField(tcat, func(name string, fieldType records.FieldType) (stop bool, err error) {
switch name {
case TcatTableNameField:
err = tcat.SetString(TcatTableNameField, tableName)
case TcatSlotsizeField:
err = tcat.SetInt64(TcatSlotsizeField, int64(layout.SlotSize))
}
return false, err
}); err != nil {
return t.wrapError(err, tableName, ErrFailedToCreateTable)
}
for _, fieldName := range schema.Fields() {
if err := fcat.Insert(); err != nil {
return t.wrapError(err, tableName, ErrFailedToCreateTable)
}
if err := scan.ForEachField(fcat, func(name string, fieldType records.FieldType) (stop bool, err error) {
switch name {
case FcatTableNameField:
err = fcat.SetString(FcatTableNameField, tableName)
case FcatFieldNameField:
err = fcat.SetString(FcatFieldNameField, fieldName)
case FcatTypeField:
err = fcat.SetInt8(FcatTypeField, int8(schema.Type(fieldName)))
case FcatLengthField:
err = fcat.SetInt64(FcatLengthField, schema.Length(fieldName))
case FcatOffsetField:
err = fcat.SetInt64(FcatOffsetField, int64(layout.Offset(fieldName)))
}
return false, err
}); err != nil {
return err
}
}
return nil
}
func (t *Tables) Layout(tableName string, trx scan.TRXInt) (records.Layout, error) {
layout := records.Layout{
Schema: records.NewSchema(),
Offsets: make(map[string]uint32, 16), //nolint:gomnd
}
tcat, fcat, err := t.NewCatalogTableScan(trx)
if err != nil {
return layout, t.wrapError(err, tableName, ErrFailedToCreateTable)
}
defer tcat.Close()
defer fcat.Close()
found := false
if err := scan.ForEach(tcat, func() (stop bool, err error) {
tableInfo := struct {
Name string
SlotSize int64
}{}
if err := scan.ForEachValue(tcat, func(name string, fieldType records.FieldType, value any) (stop bool, err error) {
var ok bool
switch name {
case TcatTableNameField:
tableInfo.Name, ok = value.(string)
case TcatSlotsizeField:
tableInfo.SlotSize, ok = value.(int64)
}
if !ok {
return true, errors.WithMessage(ErrTablesMetadata, scan.ErrUnknownFieldType.Error())
}
return false, nil
}); err != nil {
return true, err
}
if tableInfo.Name != tableName {
return false, nil
}
found = true
layout.SlotSize = uint32(tableInfo.SlotSize)
return false, nil
}); err != nil {
return layout, err
}
if !found {
return layout, errors.WithMessagef(ErrTableNotFound, `table "%s" not found`, tableName)
}
if err := scan.ForEach(fcat, func() (stop bool, err error) {
fieldInfo := struct {
TableName string
FieldName string
FieldType int8
Length int64
Offset int64
}{}
if err := scan.ForEachValue(fcat, func(name string, fieldType records.FieldType, value any) (stop bool, err error) {
var ok bool
switch name {
case FcatTableNameField:
fieldInfo.TableName, ok = value.(string)
case FcatFieldNameField:
fieldInfo.FieldName, ok = value.(string)
case FcatTypeField:
fieldInfo.FieldType, ok = value.(int8)
case FcatLengthField:
fieldInfo.Length, ok = value.(int64)
case FcatOffsetField:
fieldInfo.Offset, ok = value.(int64)
}
if !ok {
return true, errors.WithMessage(ErrTablesMetadata, scan.ErrUnknownFieldType.Error())
}
return false, nil
}); err != nil {
return true, err
}
if fieldInfo.TableName != tableName {
return false, nil
}
layout.Schema.AddField(fieldInfo.FieldName, records.FieldType(fieldInfo.FieldType), fieldInfo.Length)
layout.Offsets[fieldInfo.FieldName] = uint32(fieldInfo.Offset)
return false, nil
}); err != nil {
return layout, err
}
if layout.Schema.Count() == 0 {
return layout, ErrTableSchemaNotFound
}
return layout, nil
}
func (t *Tables) NewTableCatalogTableScan(trx scan.TRXInt) (*scan.TableScan, error) {
return scan.NewTableScan(trx, t.TcatTable, t.TcatLayout)
}
func (t *Tables) NewFieldsCatalogTableScan(trx scan.TRXInt) (*scan.TableScan, error) {
return scan.NewTableScan(trx, t.FcatTable, t.FcatLayout)
}
func (t *Tables) NewCatalogTableScan(trx scan.TRXInt) (*scan.TableScan /* tcat */, *scan.TableScan /* fcat */, error) {
tcat, err := t.NewTableCatalogTableScan(trx)
if err != nil {
return nil, nil, err
}
fcat, err := t.NewFieldsCatalogTableScan(trx)
if err != nil {
return nil, nil, err
}
return tcat, fcat, err
}
func (t *Tables) ForEachTables(trx scan.TRXInt, call func(tableName string) (stop bool, err error)) error {
ts, err := t.NewTableCatalogTableScan(trx)
if err != nil {
return err
}
defer ts.Close()
err = scan.ForEach(ts, func() (stop bool, err error) {
tableName, werr := ts.GetString(TcatTableNameField)
if werr != nil {
return true, t.wrapError(werr, t.TcatTable, nil)
}
return call(tableName)
})
return err
}
func (t *Tables) wrapError(err error, tableName string, baseError error) error {
if err == nil {
return nil
}
if errors.Is(err, ErrTablesMetadata) {
return err
}
if baseError == nil {
baseError = ErrTablesMetadata
}
return errors.WithMessagef(baseError, "table %s: %s", tableName, err)
}