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feature: engine plugin and csv dashbase example. (pingcap#5)
* first commit 1. plugin add Engine 2. show engine && show table status is work right with plugin 3. csv reader example * code support OnReaderNext and OnReaderOpen * plugin support selection
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| package executor | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "github.com/davecgh/go-spew/spew" | ||
| "github.com/pingcap/parser/model" | ||
| "github.com/pingcap/tidb/plugin" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| "golang.org/x/net/context" | ||
| ) | ||
|
|
||
| type PluginScanExecutor struct { | ||
| baseExecutor | ||
| Table *model.TableInfo | ||
| Columns []*model.ColumnInfo | ||
| Plugin *plugin.Plugin | ||
| pm *plugin.EngineManifest | ||
| meta *plugin.ExecutorMeta | ||
| } | ||
|
|
||
| func (e *PluginScanExecutor) Open(ctx context.Context) error { | ||
| e.pm = plugin.DeclareEngineManifest(e.Plugin.Manifest) | ||
| e.meta = &plugin.ExecutorMeta{ | ||
| Table: e.Table, | ||
| } | ||
| e.pm.OnReaderOpen(ctx, e.meta) | ||
| return nil | ||
| } | ||
|
|
||
| func (e *PluginScanExecutor) Next(ctx context.Context, chk *chunk.Chunk) error { | ||
| chk.Reset() | ||
| err := e.pm.OnReaderNext(ctx, chk, e.meta) | ||
| fmt.Println("pe next finished", spew.Sdump(err)) | ||
| return err | ||
| } | ||
|
|
||
| func (e *PluginScanExecutor) Close() error { | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| // Copyright 2019 PingCAP, Inc. | ||
| // | ||
| // 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "github.com/pingcap/tidb/plugin" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| ) | ||
|
|
||
| type ReadExecutor struct { | ||
| pos int | ||
| } | ||
|
|
||
| var Files = make(map[string]*ReadExecutor) | ||
|
|
||
| // Validate implements TiDB plugin's Validate SPI. | ||
| func Validate(ctx context.Context, m *plugin.Manifest) error { | ||
| fmt.Println("csv plugin validate") | ||
| return nil | ||
| } | ||
|
|
||
| // OnInit implements TiDB plugin's OnInit SPI. | ||
| func OnInit(ctx context.Context, manifest *plugin.Manifest) error { | ||
| fmt.Println("csv init called") | ||
| return nil | ||
| } | ||
|
|
||
| // OnShutdown implements TiDB plugin's OnShutdown SPI. | ||
| func OnShutdown(ctx context.Context, manifest *plugin.Manifest) error { | ||
| fmt.Println("csv shutdown called") | ||
| return nil | ||
| } | ||
|
|
||
| func OnReaderOpen(ctx context.Context, meta *plugin.ExecutorMeta) { | ||
| Files[meta.Table.Name.L] = &ReadExecutor{ | ||
| pos: 0, | ||
| } | ||
| } | ||
|
|
||
| func OnReaderNext(ctx context.Context, chk *chunk.Chunk, meta *plugin.ExecutorMeta) error { | ||
| if _, ok := Files[meta.Table.Name.L]; !ok { | ||
| fmt.Println("have some problem") | ||
| return nil | ||
| } | ||
| e := Files[meta.Table.Name.L] | ||
| if e.pos > 5 { | ||
| return nil | ||
| } | ||
| chk.AppendInt64(0, int64(e.pos)) | ||
| chk.AppendString(1, "233333") | ||
| e.pos += 1 | ||
| return nil | ||
| } |
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