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// Copyright 2021 ecodeclub | ||
// | ||
// 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. | ||
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package batchmerger | ||
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import ( | ||
"context" | ||
"database/sql" | ||
"github.com/ecodeclub/eorm/internal/errs" | ||
"github.com/ecodeclub/eorm/internal/merger" | ||
"sync" | ||
) | ||
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type Merger struct{} | ||
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func (m Merger) Merge(ctx context.Context, results []*sql.Rows) (merger.Rows, error) { | ||
if len(results) == 0 { | ||
return nil, errs.ErrMergerEmptyRows | ||
} | ||
for i := 0; i < len(results); i++ { | ||
if results[i] == nil { | ||
return nil, errs.ErrMergerRowsIsNull | ||
} | ||
} | ||
return &MergerRows{ | ||
rows: results, | ||
mu: &sync.RWMutex{}, | ||
}, nil | ||
} | ||
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type MergerRows struct { | ||
rows []*sql.Rows | ||
cnt int | ||
mu *sync.RWMutex | ||
once sync.Once | ||
} | ||
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func (m *MergerRows) Next() bool { | ||
m.mu.RLock() | ||
if m.cnt >= len(m.rows) { | ||
m.mu.RUnlock() | ||
return false | ||
} | ||
if ok := m.rows[m.cnt].Next(); ok { | ||
m.mu.RUnlock() | ||
return ok | ||
} | ||
m.mu.RUnlock() | ||
m.mu.Lock() | ||
defer m.mu.Unlock() | ||
if m.cnt >= len(m.rows) { | ||
return false | ||
} | ||
if ok := m.rows[m.cnt].Next(); ok { | ||
return ok | ||
} | ||
m.cnt++ | ||
if m.cnt < len(m.rows) { | ||
if ok := m.rows[m.cnt].Next(); ok { | ||
return ok | ||
} | ||
} | ||
return false | ||
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} | ||
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func (m *MergerRows) Scan(dest ...any) error { | ||
m.mu.RLock() | ||
defer m.mu.RUnlock() | ||
return m.rows[m.cnt].Scan(dest...) | ||
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} | ||
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func (m *MergerRows) Close() error { | ||
var err error | ||
m.once.Do(func() { | ||
for i := 0; i < len(m.rows); i++ { | ||
row := m.rows[i] | ||
err = row.Close() | ||
if err != nil { | ||
return | ||
} | ||
} | ||
}) | ||
return err | ||
} | ||
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func (m *MergerRows) Columns() ([]string, error) { | ||
return m.rows[0].Columns() | ||
} |
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// Copyright 2021 ecodeclub | ||
// | ||
// 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. | ||
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package batchmerger | ||
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import ( | ||
"context" | ||
"database/sql" | ||
"testing" | ||
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"github.com/DATA-DOG/go-sqlmock" | ||
"github.com/ecodeclub/eorm/internal/errs" | ||
"github.com/stretchr/testify/assert" | ||
"github.com/stretchr/testify/require" | ||
"github.com/stretchr/testify/suite" | ||
) | ||
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type MergerSuite struct { | ||
suite.Suite | ||
mockDB01 *sql.DB | ||
mock01 sqlmock.Sqlmock | ||
mockDB02 *sql.DB | ||
mock02 sqlmock.Sqlmock | ||
mockDB03 *sql.DB | ||
mock03 sqlmock.Sqlmock | ||
} | ||
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func (ms *MergerSuite) SetupTest() { | ||
t := ms.T() | ||
ms.initMock(t) | ||
} | ||
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func (ms *MergerSuite) TearDownTest() { | ||
_ = ms.mockDB01.Close() | ||
_ = ms.mockDB02.Close() | ||
_ = ms.mockDB03.Close() | ||
} | ||
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func (ms *MergerSuite) initMock(t *testing.T) { | ||
var err error | ||
ms.mockDB01, ms.mock01, err = sqlmock.New() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
ms.mockDB02, ms.mock02, err = sqlmock.New() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
ms.mockDB03, ms.mock03, err = sqlmock.New() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
} | ||
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func (ms *MergerSuite) TestMerger_NextandScan() { | ||
ms.mock01.ExpectQuery("SELECT *").WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow("1")) | ||
ms.mock02.ExpectQuery("SELECT *").WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow("2")) | ||
ms.mock03.ExpectQuery("SELECT *").WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow("3").AddRow("4")) | ||
testCases := []struct { | ||
name string | ||
sqlRows func() []*sql.Rows | ||
wantVal []string | ||
wantErr error | ||
scanErr error | ||
}{ | ||
{ | ||
name: "multi rows", | ||
sqlRows: func() []*sql.Rows { | ||
res := make([]*sql.Rows, 0, 3) | ||
row01, _ := ms.mockDB01.QueryContext(context.Background(), "SELECT * FROM `t1`;") | ||
res = append(res, row01) | ||
row02, _ := ms.mockDB02.QueryContext(context.Background(), "SELECT * FROM `t1`;") | ||
res = append(res, row02) | ||
row03, _ := ms.mockDB03.QueryContext(context.Background(), "SELECT * FROM `t1`;") | ||
res = append(res, row03) | ||
return res | ||
}, | ||
wantVal: []string{"1", "2", "3", "4"}, | ||
}, | ||
{ | ||
name: "empty rows", | ||
sqlRows: func() []*sql.Rows { | ||
return []*sql.Rows{} | ||
}, | ||
wantErr: errs.ErrMergerEmptyRows, | ||
}, | ||
{ | ||
name: "nil sqlrows", | ||
sqlRows: func() []*sql.Rows { | ||
return []*sql.Rows{nil} | ||
}, | ||
wantErr: errs.ErrMergerRowsIsNull, | ||
}, | ||
} | ||
for _, tc := range testCases { | ||
ms.T().Run(tc.name, func(t *testing.T) { | ||
merger := Merger{} | ||
rows, err := merger.Merge(context.Background(), tc.sqlRows()) | ||
assert.Equal(t, tc.wantErr, err) | ||
if err != nil { | ||
return | ||
} | ||
res := make([]string, 0, 4) | ||
for rows.Next() { | ||
var id string | ||
err = rows.Scan(&id) | ||
assert.Equal(t, tc.scanErr, err) | ||
if err != nil { | ||
return | ||
} | ||
res = append(res, id) | ||
} | ||
assert.Equal(t, tc.wantVal, res) | ||
}) | ||
} | ||
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} | ||
func (ms *MergerSuite) TestClose() { | ||
ms.mock01.ExpectQuery("SELECT *").WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow("1")) | ||
ms.mock02.ExpectQuery("SELECT *").WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow("2")) | ||
ms.mock03.ExpectQuery("SELECT *").WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow("3").AddRow("4")) | ||
ms.T().Run("close", func(t *testing.T) { | ||
merger := Merger{} | ||
res := make([]*sql.Rows, 0, 3) | ||
row01, _ := ms.mockDB01.QueryContext(context.Background(), "SELECT * FROM `t1`;") | ||
res = append(res, row01) | ||
row02, _ := ms.mockDB02.QueryContext(context.Background(), "SELECT * FROM `t1`;") | ||
res = append(res, row02) | ||
row03, _ := ms.mockDB03.QueryContext(context.Background(), "SELECT * FROM `t1`;") | ||
res = append(res, row03) | ||
rows, err := merger.Merge(context.Background(), res) | ||
require.NoError(t, err) | ||
if err != nil { | ||
return | ||
} | ||
err = rows.Close() | ||
require.NoError(t, err) | ||
}) | ||
} | ||
func (ms *MergerSuite) TestColumns() { | ||
ms.mock01.ExpectQuery("SELECT *").WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow("1")) | ||
ms.mock02.ExpectQuery("SELECT *").WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow("2")) | ||
ms.mock03.ExpectQuery("SELECT *").WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow("3").AddRow("4")) | ||
testCases := []struct { | ||
name string | ||
wantCols []string | ||
sqlRows func() []*sql.Rows | ||
}{ | ||
{ | ||
name: "Columns", | ||
wantCols: []string{"id"}, | ||
sqlRows: func() []*sql.Rows { | ||
res := make([]*sql.Rows, 0, 3) | ||
row01, _ := ms.mockDB01.QueryContext(context.Background(), "SELECT * FROM `t1`;") | ||
res = append(res, row01) | ||
row02, _ := ms.mockDB02.QueryContext(context.Background(), "SELECT * FROM `t1`;") | ||
res = append(res, row02) | ||
row03, _ := ms.mockDB03.QueryContext(context.Background(), "SELECT * FROM `t1`;") | ||
res = append(res, row03) | ||
return res | ||
}, | ||
}, | ||
} | ||
for _, tc := range testCases { | ||
ms.T().Run(tc.name, func(t *testing.T) { | ||
merger := Merger{} | ||
rows, err := merger.Merge(context.Background(), tc.sqlRows()) | ||
require.NoError(ms.T(), err) | ||
if err != nil { | ||
return | ||
} | ||
cols, err := rows.Columns() | ||
require.NoError(ms.T(), err) | ||
if err != nil { | ||
return | ||
} | ||
assert.Equal(t, tc.wantCols, cols) | ||
}) | ||
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} | ||
} | ||
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func TestMerger(t *testing.T) { | ||
suite.Run(t, &MergerSuite{}) | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,31 @@ | ||
// Copyright 2021 ecodeclub | ||
// | ||
// 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 merger | ||
|
||
import ( | ||
"context" | ||
"database/sql" | ||
) | ||
|
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type Merger interface { | ||
Merge(ctx context.Context, results []*sql.Rows) (Rows, error) | ||
} | ||
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type Rows interface { | ||
Next() bool | ||
Scan(dest ...any) error | ||
Close() error | ||
Columns() ([]string, error) | ||
} |