From 9d385c44cc2e02bb60484e4c3dc9eee0512da8a9 Mon Sep 17 00:00:00 2001 From: Fan Yang Date: Thu, 22 Aug 2024 18:27:44 +0800 Subject: [PATCH] Initial commit --- .gitignore | 3 + README.md | 12 ++ go.mod | 46 +++++ go.sum | 449 ++++++++++++++++++++++++++++++++++++++++++++++++ main.go | 380 ++++++++++++++++++++++++++++++++++++++++ user_example.go | 106 ++++++++++++ 6 files changed, 996 insertions(+) create mode 100644 .gitignore create mode 100644 README.md create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go create mode 100644 user_example.go diff --git a/.gitignore b/.gitignore new file mode 100644 index 00000000..acd4de06 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +myduckserver +*.db +*.wal diff --git a/README.md b/README.md new file mode 100644 index 00000000..98c93f03 --- /dev/null +++ b/README.md @@ -0,0 +1,12 @@ +# MyDuckServer + +``` +pip3 install "sqlglot[rs]" +go build +./myduckserver +``` + +In another terminal: +``` +mysql -h127.0.0.1 -uroot -P3306 -Ac; +``` diff --git a/go.mod b/go.mod new file mode 100644 index 00000000..133ce83b --- /dev/null +++ b/go.mod @@ -0,0 +1,46 @@ +module github.com/apecloud/myduckserver + +go 1.22.4 + +require ( + github.com/dolthub/go-mysql-server v0.18.1 + github.com/marcboeker/go-duckdb v1.7.1 +) + +require ( + github.com/apache/arrow/go/v17 v17.0.0 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/dolthub/flatbuffers/v23 v23.3.3-dh.2 // indirect + github.com/dolthub/go-icu-regex v0.0.0-20230524105445-af7e7991c97e // indirect + github.com/dolthub/jsonpath v0.0.2-0.20240227200619-19675ab05c71 // indirect + github.com/dolthub/vitess v0.0.0-20240404214255-c5a87fc7b325 // indirect + github.com/go-kit/kit v0.10.0 // indirect + github.com/goccy/go-json v0.10.3 // indirect + github.com/google/flatbuffers v24.3.25+incompatible // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/hashicorp/golang-lru v0.5.4 // indirect + github.com/klauspost/compress v1.17.9 // indirect + github.com/klauspost/cpuid/v2 v2.2.8 // indirect + github.com/lestrrat-go/strftime v1.0.4 // indirect + github.com/mitchellh/mapstructure v1.5.0 // indirect + github.com/pierrec/lz4/v4 v4.1.21 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + github.com/shopspring/decimal v1.3.1 // indirect + github.com/sirupsen/logrus v1.8.1 // indirect + github.com/tetratelabs/wazero v1.1.0 // indirect + github.com/zeebo/xxh3 v1.0.2 // indirect + go.opentelemetry.io/otel v1.7.0 // indirect + go.opentelemetry.io/otel/trace v1.7.0 // indirect + golang.org/x/exp v0.0.0-20240222234643-814bf88cf225 // indirect + golang.org/x/mod v0.18.0 // indirect + golang.org/x/sync v0.7.0 // indirect + golang.org/x/sys v0.21.0 // indirect + golang.org/x/text v0.16.0 // indirect + golang.org/x/tools v0.22.0 // indirect + golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de // indirect + google.golang.org/grpc v1.63.2 // indirect + google.golang.org/protobuf v1.34.2 // indirect + gopkg.in/src-d/go-errors.v1 v1.0.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 00000000..d289cdeb --- /dev/null +++ b/go.sum @@ -0,0 +1,449 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA= +filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0= +github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo= +github.com/Shopify/toxiproxy 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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 main + +import ( + "bytes" + "context" + "fmt" + "io" + "os/exec" + "strings" + + stdsql "database/sql" + + sqle "github.com/dolthub/go-mysql-server" + "github.com/dolthub/go-mysql-server/memory" + "github.com/dolthub/go-mysql-server/server" + "github.com/dolthub/go-mysql-server/sql" + "github.com/dolthub/go-mysql-server/sql/plan" + "github.com/dolthub/go-mysql-server/sql/types" + "github.com/dolthub/vitess/go/mysql" + "github.com/sirupsen/logrus" + + _ "github.com/marcboeker/go-duckdb" +) + +// This is an example of how to implement a MySQL server. +// After running the example, you may connect to it using the following: +// +// > mysql --host=localhost --port=3306 --user=root +// +// The included MySQL client is used in this example, however any MySQL-compatible client will work. + +var ( + address = "localhost" + port = 3306 + dbName = "mysql" + dbFile = dbName + ".db" +) + +type DuckBuilder struct { + provider sql.MutableDatabaseProvider + base sql.NodeExecBuilder + conns map[uint32]*stdsql.DB +} + +func (b *DuckBuilder) Build(ctx *sql.Context, root sql.Node, r sql.Row) (sql.RowIter, error) { + n := root + qp, ok := n.(*plan.QueryProcess) + if ok { + n = qp.Child() + } + tc, ok := n.(*plan.TransactionCommittingNode) + if ok { + n = tc.Child() + } + rua, ok := n.(*plan.RowUpdateAccumulator) + if ok { + n = rua.Child() + } + fmt.Println("Query:", ctx.Query()) + fmt.Printf("Node Type: %T\n", n) + fmt.Println("Node:", n) + + // Handle special queries + switch ctx.Query() { + case "select @@version_comment limit 1": + return b.base.Build(ctx, root, r) + case "SELECT DATABASE()": + return b.base.Build(ctx, root, r) + } + + conn, ok := b.conns[ctx.ID()] + if !ok { + c, err := stdsql.Open("duckdb", dbFile) + if err != nil { + return nil, err + } + b.conns[ctx.ID()] = c + conn = c + } + + switch node := n.(type) { + case *plan.ResolvedTable: + return b.executeQuery(ctx, node, conn) + case sql.Expressioner: + return b.executeExpressioner(ctx, node, conn) + case *plan.CreateDB: + if err := b.executeBase(ctx, node, r); err != nil { + return nil, err + } + ctx = ctx.WithQuery(strings.Replace( + strings.ToLower(strings.TrimSpace(ctx.Query())), + "create database", + "create schema", + 1, + )) + return b.executeDDL(ctx, node, conn) + case *plan.DropDB: + if err := b.executeBase(ctx, node, r); err != nil { + return nil, err + } + ctx = ctx.WithQuery(strings.Replace( + strings.ToLower(strings.TrimSpace(ctx.Query())), + "drop database", + "drop schema", + 1, + )) + return b.executeDDL(ctx, node, conn) + case *plan.DropTable: + return b.executeDDL(ctx, node, conn) + case *plan.RenameTable: + return b.executeDDL(ctx, node, conn) + case *plan.DeleteFrom: + return b.executeDML(ctx, n, conn) + default: + return b.base.Build(ctx, n, r) + } +} + +func (b *DuckBuilder) executeBase(ctx *sql.Context, n sql.Node, r sql.Row) error { + if iter, err := b.base.Build(ctx, n, r); err != nil { + return err + } else { + _, err = sql.RowIterToRows(ctx, iter) + return err + } +} + +func (b *DuckBuilder) executeExpressioner(ctx *sql.Context, n sql.Expressioner, conn *stdsql.DB) (sql.RowIter, error) { + node := n.(sql.Node) + switch n := n.(type) { + case *plan.CreateTable: + if err := b.executeBase(ctx, node, nil); err != nil { + return nil, err + } + return b.executeDDL(ctx, n, conn) + case *plan.AddColumn: + return b.executeDDL(ctx, n, conn) + case *plan.RenameColumn: + return b.executeDDL(ctx, n, conn) + case *plan.DropColumn: + return b.executeDDL(ctx, n, conn) + case *plan.ModifyColumn: + return b.executeDDL(ctx, n, conn) + case *plan.InsertInto: + return b.executeDML(ctx, n, conn) + case *plan.Update: + return b.executeDML(ctx, n, conn) + default: + return b.executeQuery(ctx, node, conn) + } +} + +func (b *DuckBuilder) executeQuery(ctx *sql.Context, n sql.Node, conn *stdsql.DB) (sql.RowIter, error) { + fmt.Println("Executing Query...") + // Translate the MySQL query to a DuckDB query + duckSQL, err := translate(ctx.Query()) + if err != nil { + return nil, err + } + + // Execute the DuckDB query + rows, err := conn.QueryContext(ctx.Context, duckSQL) + if err != nil { + return nil, err + } + + // Create a new iterator + iter := &SQLRowIter{rows: rows, schema: n.Schema()} + + return iter, nil +} + +func (b *DuckBuilder) executeDML(ctx *sql.Context, n sql.Node, conn *stdsql.DB) (sql.RowIter, error) { + fmt.Println("Executing DML...") + // Translate the MySQL query to a DuckDB query + duckSQL, err := translate(ctx.Query()) + if err != nil { + return nil, err + } + + // Execute the DuckDB query + result, err := conn.ExecContext(ctx.Context, duckSQL) + if err != nil { + return nil, err + } + + affected, err := result.RowsAffected() + if err != nil { + return nil, err + } + + insertId, err := result.LastInsertId() + if err != nil { + return nil, err + } + + return sql.RowsToRowIter(sql.NewRow(types.OkResult{ + RowsAffected: uint64(affected), + InsertID: uint64(insertId), + })), nil +} + +func (b *DuckBuilder) executeDDL(ctx *sql.Context, n sql.Node, conn *stdsql.DB) (sql.RowIter, error) { + fmt.Println("Executing DDL...") + // Translate the MySQL query to a DuckDB query + duckSQL, err := translate(ctx.Query()) + if err != nil { + return nil, err + } + + // Execute the DuckDB query + _, err = conn.ExecContext(ctx.Context, duckSQL) + if err != nil { + return nil, err + } + + return sql.RowsToRowIter(sql.NewRow(types.OkResult{})), nil +} + +// translate converts a MySQL query to a DuckDB query using SQLGlot. +// For simplicity, we assume that Python and SQLGlot are installed on the system. +// Then we can call the following shell command to convert the query. +// +// python -c 'import sys; import sqlglot; sql = sys.stdin.read(); print(sqlglot.transpile(sql, read="mysql", write="duckdb")[0]) +// +// In the future, we can deploy a SQLGlot server and use the API to convert the query. +func translate(mysqlQuery string) (string, error) { + // Prepare the command to be executed + cmd := exec.Command("python", "-c", `import sys; import sqlglot; sql = sys.stdin.read(); print(sqlglot.transpile(sql, read="mysql", write="duckdb")[0])`) + + // Set the input for the command + cmd.Stdin = bytes.NewBufferString(mysqlQuery) + + // Capture the output of the command + var out bytes.Buffer + cmd.Stdout = &out + + // Execute the command + if err := cmd.Run(); err != nil { + return "", err + } + + // Return the converted query + return out.String(), nil +} + +var _ sql.RowIter = (*SQLRowIter)(nil) + +// SQLRowIter wraps a standard sql.Rows as a RowIter. +type SQLRowIter struct { + rows *stdsql.Rows + schema sql.Schema +} + +// Next retrieves the next row. It will return io.EOF if it's the last row. +func (iter *SQLRowIter) Next(ctx *sql.Context) (sql.Row, error) { + if !iter.rows.Next() { + if err := iter.rows.Err(); err != nil { + return nil, err + } + return nil, io.EOF + } + + columns, err := iter.rows.Columns() + if err != nil { + return nil, err + } + + values := make([]interface{}, len(columns)) + valuePtrs := make([]interface{}, len(columns)) + for i := range values { + valuePtrs[i] = &values[i] + } + + if err := iter.rows.Scan(valuePtrs...); err != nil { + return nil, err + } + + // Prune the values to match the schema + if len(values) > len(iter.schema) { + values = values[:len(iter.schema)] + } else if len(values) < len(iter.schema) { + for i := len(values); i < len(iter.schema); i++ { + values = append(values, nil) + } + } + + return sql.NewRow(values...), nil +} + +// Close closes the underlying sql.Rows. +func (iter *SQLRowIter) Close(ctx *sql.Context) error { + return iter.rows.Close() +} + +func main() { + pro := memory.NewDBProvider() + engine := sqle.NewDefault(pro) + + builder := &DuckBuilder{provider: pro, base: engine.Analyzer.ExecBuilder, conns: make(map[uint32]*stdsql.DB)} + engine.Analyzer.ExecBuilder = builder + + session := memory.NewSession(sql.NewBaseSession(), pro) + ctx := sql.NewContext(context.Background(), sql.WithSession(session)) + ctx.SetCurrentDatabase("mysql") + + // This variable may be found in the "users_example.go" file. Please refer to that file for a walkthrough on how to + // set up the "mysql" database to allow user creation and user checking when establishing connections. This is set + // to false for this example, but feel free to play around with it and see how it works. + if enableUsers { + if err := enableUserAccounts(ctx, engine); err != nil { + panic(err) + } + } + + config := server.Config{ + Protocol: "tcp", + Address: fmt.Sprintf("%s:%d", address, port), + } + s, err := server.NewServerWithHandler(config, engine, memory.NewSessionBuilder(pro), nil, wrapHandler(builder)) + if err != nil { + panic(err) + } + if err = s.Start(); err != nil { + panic(err) + } +} + +type MyHandler struct { + *server.Handler + builder *DuckBuilder +} + +func (h *MyHandler) ConnectionClosed(c *mysql.Conn) { + conn, ok := h.builder.conns[c.ConnectionID] + if ok { + if err := conn.Close(); err != nil { + logrus.Warn("Failed to close connection:", err) + } + } + h.Handler.ConnectionClosed(c) +} + +func (h *MyHandler) ComInitDB(c *mysql.Conn, schemaName string) error { + conn, ok := h.builder.conns[c.ConnectionID] + if ok { + if _, err := conn.Exec("USE " + dbName + "." + schemaName); err != nil { + logrus.Warn("Failed to use "+schemaName+":", err) + } + } + return h.Handler.ComInitDB(c, schemaName) +} + +func wrapHandler(b *DuckBuilder) server.HandlerWrapper { + return func(h mysql.Handler) (mysql.Handler, error) { + handler, ok := h.(*server.Handler) + if !ok { + return nil, fmt.Errorf("expected *server.Handler, got %T", h) + } + + return &MyHandler{ + Handler: handler, + builder: b, + }, nil + } +} diff --git a/user_example.go b/user_example.go new file mode 100644 index 00000000..5bac6ea2 --- /dev/null +++ b/user_example.go @@ -0,0 +1,106 @@ +// Copyright 2022 Dolthub, 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, +// 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 main + +import ( + sqle "github.com/dolthub/go-mysql-server" + "github.com/dolthub/go-mysql-server/sql" + "github.com/dolthub/go-mysql-server/sql/mysql_db" +) + +// This file walks through how an application might add support for users through the inclusion of the "mysql" database. +// By default, this database is disabled, and must be either explicitly enabled, or implicitly enabled by loading into +// it. When disabled, all users are accepted, meaning that anyone may connect to your application. This is great for +// testing, but not so great for an exposed application that wants to protect itself from malicious actors. + +var ( + // When set to true, calls "enableUserAccounts". + enableUsers = false + + // When set to false, we create an account named "root" that has all privileges and does not have a password set. + // When set to true, we create an account named "gms_user" that has all privileges and has the password "123456". + // This is a stand-in for checking whether a file exists that contains the "mysql" database's data. + pretendThatFileExists = false +) + +// MySQLPersister is an example struct which handles the persistence of the data in the "mysql" database. +type MySQLPersister struct { + Data []byte +} + +var _ mysql_db.MySQLDbPersistence = (*MySQLPersister)(nil) + +// Persist implements the interface mysql_db.MySQLDbPersistence. This function is simple, in that it simply stores +// the given data inside itself. A real application would persist to the file system. +func (m *MySQLPersister) Persist(ctx *sql.Context, data []byte) error { + m.Data = data + return nil +} + +func enableUserAccounts(ctx *sql.Context, engine *sqle.Engine) error { + mysqlDb := engine.Analyzer.Catalog.MySQLDb + + // The functions "AddRootAccount" and "LoadData" both automatically enable the "mysql" database, but this is just + // to explicitly show how one can manually enable (or disable) the database. + mysqlDb.SetEnabled(true) + + // The persister here simply stands-in for your provided persistence function. The database calls this whenever it + // needs to save any changes to any of the "mysql" database's tables. The memory session persists in memory, + // but can be swapped out with the lines below + // persister := &MySQLPersister{} + // mysqlDb.SetPersister(persister) + + // Here we show how a real application may choose to bootstrap their users. If we've previously created a file + // (generated by calling the above persister), then we may check that the file exists, and load the file if it does. + // If the file does not exist, then we create a "root" account, so that we may create our default users. Do remember + // to either remove the "root" account when done, or give it a password, otherwise you'll have an all-powerful + // account without any protection. + if pretendThatFileExists { + dataLoadedFromPretendFile := createLoadedData() + if err := mysqlDb.LoadData(ctx, dataLoadedFromPretendFile); err != nil { + return err + } + } else { + // AddRootAccount creates a password-less account named "root" that has all privileges. This is intended for use + // with testing, and also to set up the initial user accounts. A real application may want to check that a + // persisted file exists, and call "LoadData" if one does. If a file does not exist, it would call + // "AddRootAccount". + mysqlDb.AddRootAccount() + } + + return nil +} + +// createLoadedData returns data that would match what a file would contain if you had a single user named "gms_user" +// (on "localhost") that had all privileges, along with the password "123456". +func createLoadedData() []byte { + // As we continue development on go-mysql-server, our file format will continue to evolve. We guarantee backward + // compatibility for persisted "mysql" databases, so the below data will always work. This is only here for example + // purposes. + return []byte{ + 16, 0, 0, 0, 0, 0, 0, 0, 8, 0, 12, 0, 8, 0, 4, 0, 8, 0, 0, 0, 8, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, + 28, 0, 0, 0, 0, 0, 22, 0, 40, 0, 36, 0, 32, 0, 28, 0, 24, 0, 20, 0, 8, 0, 0, 0, 0, 0, 4, 0, 22, 0, 0, 0, 36, 0, + 0, 0, 168, 231, 96, 99, 0, 0, 0, 0, 0, 0, 0, 0, 28, 0, 0, 0, 72, 0, 0, 0, 104, 0, 0, 0, 248, 0, 0, 0, 4, 1, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 42, 54, 66, 66, 52, 56, 51, 55, 69, 66, 55, 52, 51, 50, 57, 49, 48, 53, + 69, 69, 52, 53, 54, 56, 68, 68, 65, 55, 68, 67, 54, 55, 69, 68, 50, 67, 65, 50, 65, 68, 57, 0, 0, 0, 21, 0, 0, + 0, 109, 121, 115, 113, 108, 95, 110, 97, 116, 105, 118, 101, 95, 112, 97, 115, 115, 119, 111, 114, 100, 0, 10, + 0, 16, 0, 12, 0, 8, 0, 4, 0, 10, 0, 0, 0, 12, 0, 0, 0, 12, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 30, 0, + 0, 0, 23, 0, 0, 0, 7, 0, 0, 0, 6, 0, 0, 0, 3, 0, 0, 0, 24, 0, 0, 0, 16, 0, 0, 0, 8, 0, 0, 0, 22, 0, 0, 0, 21, 0, + 0, 0, 18, 0, 0, 0, 15, 0, 0, 0, 29, 0, 0, 0, 27, 0, 0, 0, 11, 0, 0, 0, 28, 0, 0, 0, 26, 0, 0, 0, 5, 0, 0, 0, 4, + 0, 0, 0, 2, 0, 0, 0, 30, 0, 0, 0, 25, 0, 0, 0, 20, 0, 0, 0, 19, 0, 0, 0, 14, 0, 0, 0, 13, 0, 0, 0, 17, 0, 0, 0, + 9, 0, 0, 0, 1, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 108, 111, 99, 97, 108, 104, 111, 115, 116, 0, 0, 0, + 8, 0, 0, 0, 103, 109, 115, 95, 117, 115, 101, 114, 0, 0, 0, 0, + } +}