132 lines
4.9 KiB
Go
132 lines
4.9 KiB
Go
// Copyright 2019 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"context"
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"fmt"
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"strings"
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"sync/atomic"
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"github.com/pingcap/tidb/plugin"
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"github.com/pingcap/tidb/sessionctx/variable"
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)
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// Accumulator of connection
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// It can be increased by 1 after each OnConnectionEvent is triggered.
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var connection int32
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// Validate implements TiDB plugin's Validate SPI.
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// It is called before OnInit
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// nolint: unused, deadcode
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func Validate(ctx context.Context, m *plugin.Manifest) error {
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fmt.Println("## conn_ip_example Validate called ##")
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fmt.Printf("---- context: %s\n", ctx)
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return nil
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}
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// OnInit implements TiDB plugin's OnInit SPI.
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// nolint: unused, deadcode
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func OnInit(ctx context.Context, manifest *plugin.Manifest) error {
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fmt.Println("## conn_ip_example OnInit called ##")
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fmt.Printf("---- context: %s\n", ctx)
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// Register an example system variable
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// With the server.
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sv := &variable.SysVar{
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Name: "conn_ip_example_key",
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Scope: variable.ScopeGlobal | variable.ScopeSession,
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Value: "v1",
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Type: variable.TypeStr, // default.
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// (Optional) specifying a validation function helps to normalize the value before setting it.
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// The "normalizedValue" applies if the value has a Type associated, where some formatting may have already
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// been applied. i.e. TypeBool: ON/oN/1/on -> ON
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Validation: func(vars *variable.SessionVars, normalizedValue string, originalValue string, scope variable.ScopeFlag) (string, error) {
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fmt.Println("The validation function was called")
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return strings.ToLower(normalizedValue), nil
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},
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// (Optional) the SetSession function is called when a session scoped variable is changed.
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// *And* when a new session is initialized.
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SetSession: func(vars *variable.SessionVars, value string) error {
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fmt.Println("The set session function was called")
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return nil
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},
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// (Optional) the SetGlobal function is called when a global variable is changed.
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// This will only be called on the TiDB server that the change is made on,
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// and not on the tidb-server peers which will also update their global variable eventually.
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SetGlobal: func(_ context.Context, vars *variable.SessionVars, value string) error {
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fmt.Println("The set global function was called")
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return nil
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},
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}
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variable.RegisterSysVar(sv)
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fmt.Printf("---- read cfg in init [key: conn_ip_example_key, value: %s]\n", variable.GetSysVar("conn_ip_example_key").Value)
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atomic.SwapInt32(&connection, 0)
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return nil
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}
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// OnShutdown implements TiDB plugin's OnShutdown SPI.
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// nolint: unused, deadcode
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func OnShutdown(ctx context.Context, manifest *plugin.Manifest) error {
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fmt.Println("## conn_ip_example OnShutdown called ##")
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fmt.Printf("---- context: %s\n", ctx)
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fmt.Printf("---- read cfg in shutdown [key: conn_ip_example_key, value: %s]\n", variable.GetSysVar("conn_ip_example_key").Value)
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atomic.SwapInt32(&connection, 0)
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return nil
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}
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// OnGeneralEvent implements TiDB Audit plugin's OnGeneralEvent SPI.
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// nolint: unused, deadcode
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func OnGeneralEvent(ctx context.Context, sctx *variable.SessionVars, event plugin.GeneralEvent, cmd string) {
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fmt.Println("## conn_ip_example OnGeneralEvent called ##")
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if sctx != nil {
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fmt.Printf("---- session status: %d\n", sctx.Status)
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digest, _ := sctx.StmtCtx.SQLDigest()
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fmt.Printf("---- statement sql: %s, digest: %s\n", sctx.StmtCtx.OriginalSQL, digest)
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if len(sctx.StmtCtx.Tables) > 0 {
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fmt.Printf("---- statement tables: %#v\n", sctx.StmtCtx.Tables)
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}
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fmt.Printf("---- executed by user: %#v\n", sctx.User)
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}
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switch event {
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case plugin.Starting:
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fmt.Println("---- event: Statement Starting")
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case plugin.Completed:
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fmt.Println("---- event: Statement Completed")
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case plugin.Error:
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fmt.Println("---- event: ERROR!")
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default:
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fmt.Println("---- event: unrecognized")
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}
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fmt.Printf("---- cmd: %s\n", cmd)
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}
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// OnConnectionEvent implements TiDB Audit plugin's OnConnectionEvent SPI.
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// nolint: unused, deadcode
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func OnConnectionEvent(ctx context.Context, event plugin.ConnectionEvent, info *variable.ConnectionInfo) error {
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var reason string
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if r := ctx.Value(plugin.RejectReasonCtxValue{}); r != nil {
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reason = r.(string)
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}
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fmt.Println("## conn_ip_example onConnectionEvent called ##")
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fmt.Printf("---- conenct event: %s, reason: [%s]\n", event, reason)
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fmt.Printf("---- connection host: %s\n", info.Host)
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fmt.Printf("---- connection details: %s@%s/%s type: %s\n", info.User, info.Host, info.DB, info.ConnectionType)
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atomic.AddInt32(&connection, 1)
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return nil
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}
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