Merge branch 'go-sql-driver:master' into fix_bigint_unsigned_scan_type

.github/workflows/test.yml

@@ -83,7 +83,7 @@ jobs:
           my-cnf: |
             innodb_log_file_size=256MB
             innodb_buffer_pool_size=512MB
-            max_allowed_packet=16MB
+            max_allowed_packet=48MB
             ; TestConcurrent fails if max_connections is too large
             max_connections=50
             local_infile=1

AUTHORS

@@ -20,7 +20,9 @@ Andrew Reid <andrew.reid at tixtrack.com>
 Animesh Ray <mail.rayanimesh at gmail.com>
 Arne Hormann <arnehormann at gmail.com>
 Ariel Mashraki <ariel at mashraki.co.il>
+Artur Melanchyk <artur.melanchyk@gmail.com>
 Asta Xie <xiemengjun at gmail.com>
+B Lamarche <blam413 at gmail.com>
 Brian Hendriks <brian at dolthub.com>
 Bulat Gaifullin <gaifullinbf at gmail.com>
 Caine Jette <jette at alum.mit.edu>
@@ -62,6 +64,7 @@ Jennifer Purevsuren <jennifer at dolthub.com>
 Jerome Meyer <jxmeyer at gmail.com>
 Jiajia Zhong <zhong2plus at gmail.com>
 Jian Zhen <zhenjl at gmail.com>
+Joe Mann <contact at joemann.co.uk>
 Joshua Prunier <joshua.prunier at gmail.com>
 Julien Lefevre <julien.lefevr at gmail.com>
 Julien Schmidt <go-sql-driver at julienschmidt.com>
@@ -92,6 +95,7 @@ Paul Bonser <misterpib at gmail.com>
 Paulius Lozys <pauliuslozys at gmail.com>
 Peter Schultz <peter.schultz at classmarkets.com>
 Phil Porada <philporada at gmail.com>
+Minh Quang <minhquang4334 at gmail.com>
 Rebecca Chin <rchin at pivotal.io>
 Reed Allman <rdallman10 at gmail.com>
 Richard Wilkes <wilkes at me.com>

README.md

@@ -38,6 +38,7 @@ A MySQL-Driver for Go's [database/sql](https://golang.org/pkg/database/sql/) pac
   * Secure `LOAD DATA LOCAL INFILE` support with file allowlisting and `io.Reader` support
   * Optional `time.Time` parsing
   * Optional placeholder interpolation
+  * Supports zlib compression.
 
 ## Requirements
 
@@ -267,6 +268,16 @@ SELECT u.id FROM users as u
 
 will return `u.id` instead of just `id` if `columnsWithAlias=true`.
 
+##### `compress`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+Toggles zlib compression. false by default.
+
 ##### `interpolateParams`
 
 ```

benchmark_test.go

@@ -46,9 +46,13 @@ func (tb *TB) checkStmt(stmt *sql.Stmt, err error) *sql.Stmt {
 	return stmt
 }
 
-func initDB(b *testing.B, queries ...string) *sql.DB {
+func initDB(b *testing.B, useCompression bool, queries ...string) *sql.DB {
 	tb := (*TB)(b)
-	db := tb.checkDB(sql.Open(driverNameTest, dsn))
+	comprStr := ""
+	if useCompression {
+		comprStr = "&compress=1"
+	}
+	db := tb.checkDB(sql.Open(driverNameTest, dsn+comprStr))
 	for _, query := range queries {
 		if _, err := db.Exec(query); err != nil {
 			b.Fatalf("error on %q: %v", query, err)
@@ -60,10 +64,18 @@ func initDB(b *testing.B, queries ...string) *sql.DB {
 const concurrencyLevel = 10
 
 func BenchmarkQuery(b *testing.B) {
+	benchmarkQueryHelper(b, false)
+}
+
+func BenchmarkQueryCompression(b *testing.B) {
+	benchmarkQueryHelper(b, true)
+}
+
+func benchmarkQueryHelper(b *testing.B, compr bool) {
 	tb := (*TB)(b)
 	b.StopTimer()
 	b.ReportAllocs()
-	db := initDB(b,
+	db := initDB(b, compr,
 		"DROP TABLE IF EXISTS foo",
 		"CREATE TABLE foo (id INT PRIMARY KEY, val CHAR(50))",
 		`INSERT INTO foo VALUES (1, "one")`,
@@ -222,7 +234,7 @@ func BenchmarkInterpolation(b *testing.B) {
 		},
 		maxAllowedPacket: maxPacketSize,
 		maxWriteSize:     maxPacketSize - 1,
-		buf:              newBuffer(nil),
+		buf:              newBuffer(),
 	}
 
 	args := []driver.Value{
@@ -269,7 +281,7 @@ func benchmarkQueryContext(b *testing.B, db *sql.DB, p int) {
 }
 
 func BenchmarkQueryContext(b *testing.B) {
-	db := initDB(b,
+	db := initDB(b, false,
 		"DROP TABLE IF EXISTS foo",
 		"CREATE TABLE foo (id INT PRIMARY KEY, val CHAR(50))",
 		`INSERT INTO foo VALUES (1, "one")`,
@@ -305,7 +317,7 @@ func benchmarkExecContext(b *testing.B, db *sql.DB, p int) {
 }
 
 func BenchmarkExecContext(b *testing.B) {
-	db := initDB(b,
+	db := initDB(b, false,
 		"DROP TABLE IF EXISTS foo",
 		"CREATE TABLE foo (id INT PRIMARY KEY, val CHAR(50))",
 		`INSERT INTO foo VALUES (1, "one")`,
@@ -323,7 +335,7 @@ func BenchmarkExecContext(b *testing.B) {
 // "size=" means size of each blobs.
 func BenchmarkQueryRawBytes(b *testing.B) {
 	var sizes []int = []int{100, 1000, 2000, 4000, 8000, 12000, 16000, 32000, 64000, 256000}
-	db := initDB(b,
+	db := initDB(b, false,
 		"DROP TABLE IF EXISTS bench_rawbytes",
 		"CREATE TABLE bench_rawbytes (id INT PRIMARY KEY, val LONGBLOB)",
 	)
@@ -376,7 +388,7 @@ func BenchmarkQueryRawBytes(b *testing.B) {
 // BenchmarkReceiveMassiveRows measures performance of receiving large number of rows.
 func BenchmarkReceiveMassiveRows(b *testing.B) {
 	// Setup -- prepare 10000 rows.
-	db := initDB(b,
+	db := initDB(b, false,
 		"DROP TABLE IF EXISTS foo",
 		"CREATE TABLE foo (id INT PRIMARY KEY, val TEXT)")
 	defer db.Close()

buffer.go

@@ -10,54 +10,42 @@ package mysql
 
 import (
 	"io"
-	"net"
-	"time"
 )
 
 const defaultBufSize = 4096
 const maxCachedBufSize = 256 * 1024
 
+// readerFunc is a function that compatible with io.Reader.
+// We use this function type instead of io.Reader because we want to
+// just pass mc.readWithTimeout.
+type readerFunc func([]byte) (int, error)
+
 // A buffer which is used for both reading and writing.
 // This is possible since communication on each connection is synchronous.
 // In other words, we can't write and read simultaneously on the same connection.
 // The buffer is similar to bufio.Reader / Writer but zero-copy-ish
 // Also highly optimized for this particular use case.
-// This buffer is backed by two byte slices in a double-buffering scheme
 type buffer struct {
-	buf     []byte // buf is a byte buffer who's length and capacity are equal.
-	nc      net.Conn
-	idx     int
-	length  int
-	timeout time.Duration
-	dbuf    [2][]byte // dbuf is an array with the two byte slices that back this buffer
-	flipcnt uint      // flipccnt is the current buffer counter for double-buffering
+	buf       []byte // read buffer.
+	cachedBuf []byte // buffer that will be reused. len(cachedBuf) <= maxCachedBufSize.
 }
 
 // newBuffer allocates and returns a new buffer.
-func newBuffer(nc net.Conn) buffer {
-	fg := make([]byte, defaultBufSize)
+func newBuffer() buffer {
 	return buffer{
-		buf:  fg,
-		nc:   nc,
-		dbuf: [2][]byte{fg, nil},
+		cachedBuf: make([]byte, defaultBufSize),
 	}
 }
 
-// flip replaces the active buffer with the background buffer
-// this is a delayed flip that simply increases the buffer counter;
-// the actual flip will be performed the next time we call `buffer.fill`
-func (b *buffer) flip() {
-	b.flipcnt += 1
+// busy returns true if the read buffer is not empty.
+func (b *buffer) busy() bool {
+	return len(b.buf) > 0
 }
 
-// fill reads into the buffer until at least _need_ bytes are in it
-func (b *buffer) fill(need int) error {
-	n := b.length
-	// fill data into its double-buffering target: if we've called
-	// flip on this buffer, we'll be copying to the background buffer,
-	// and then filling it with network data; otherwise we'll just move
-	// the contents of the current buffer to the front before filling it
-	dest := b.dbuf[b.flipcnt&1]
+// fill reads into the read buffer until at least _need_ bytes are in it.
+func (b *buffer) fill(need int, r readerFunc) error {
+	// we'll move the contents of the current buffer to dest before filling it.
+	dest := b.cachedBuf
 
 	// grow buffer if necessary to fit the whole packet.
 	if need > len(dest) {
@@ -67,83 +55,67 @@ func (b *buffer) fill(need int) error {
 		// if the allocated buffer is not too large, move it to backing storage
 		// to prevent extra allocations on applications that perform large reads
 		if len(dest) <= maxCachedBufSize {
-			b.dbuf[b.flipcnt&1] = dest
+			b.cachedBuf = dest
 		}
 	}
 
-	// if we're filling the fg buffer, move the existing data to the start of it.
-	// if we're filling the bg buffer, copy over the data
-	if n > 0 {
-		copy(dest[:n], b.buf[b.idx:])
-	}
-
-	b.buf = dest
-	b.idx = 0
+	// move the existing data to the start of the buffer.
+	n := len(b.buf)
+	copy(dest[:n], b.buf)
 
 	for {
-		if b.timeout > 0 {
-			if err := b.nc.SetReadDeadline(time.Now().Add(b.timeout)); err != nil {
-				return err
-			}
+		nn, err := r(dest[n:])
+		n += nn
+
+		if err == nil && n < need {
+			continue
 		}
 
-		nn, err := b.nc.Read(b.buf[n:])
-		n += nn
+		b.buf = dest[:n]
 
-		switch err {
-		case nil:
+		if err == io.EOF {
 			if n < need {
-				continue
+				err = io.ErrUnexpectedEOF
+			} else {
+				err = nil
 			}
-			b.length = n
-			return nil
-
-		case io.EOF:
-			if n >= need {
-				b.length = n
-				return nil
-			}
-			return io.ErrUnexpectedEOF
-
-		default:
-			return err
 		}
+		return err
 	}
 }
 
 // returns next N bytes from buffer.
 // The returned slice is only guaranteed to be valid until the next read
-func (b *buffer) readNext(need int) ([]byte, error) {
-	if b.length < need {
+func (b *buffer) readNext(need int, r readerFunc) ([]byte, error) {
+	if len(b.buf) < need {
 		// refill
-		if err := b.fill(need); err != nil {
+		if err := b.fill(need, r); err != nil {
 			return nil, err
 		}
 	}
 
-	offset := b.idx
-	b.idx += need
-	b.length -= need
-	return b.buf[offset:b.idx], nil
+	data := b.buf[:need]
+	b.buf = b.buf[need:]
+	return data, nil
 }
 
 // takeBuffer returns a buffer with the requested size.
 // If possible, a slice from the existing buffer is returned.
 // Otherwise a bigger buffer is made.
 // Only one buffer (total) can be used at a time.
 func (b *buffer) takeBuffer(length int) ([]byte, error) {
-	if b.length > 0 {
+	if b.busy() {
 		return nil, ErrBusyBuffer
 	}
 
 	// test (cheap) general case first
-	if length <= cap(b.buf) {
-		return b.buf[:length], nil
+	if length <= len(b.cachedBuf) {
+		return b.cachedBuf[:length], nil
 	}
 
-	if length < maxPacketSize {
-		b.buf = make([]byte, length)
-		return b.buf, nil
+	if length < maxCachedBufSize {
+		b.cachedBuf = make([]byte, length)
+		return b.cachedBuf, nil
 	}
 
 	// buffer is larger than we want to store.
@@ -154,29 +126,26 @@ func (b *buffer) takeBuffer(length int) ([]byte, error) {
 // known to be smaller than defaultBufSize.
 // Only one buffer (total) can be used at a time.
 func (b *buffer) takeSmallBuffer(length int) ([]byte, error) {
-	if b.length > 0 {
+	if b.busy() {
 		return nil, ErrBusyBuffer
 	}
-	return b.buf[:length], nil
+	return b.cachedBuf[:length], nil
 }
 
 // takeCompleteBuffer returns the complete existing buffer.
 // This can be used if the necessary buffer size is unknown.
 // cap and len of the returned buffer will be equal.
 // Only one buffer (total) can be used at a time.
 func (b *buffer) takeCompleteBuffer() ([]byte, error) {
-	if b.length > 0 {
+	if b.busy() {
 		return nil, ErrBusyBuffer
 	}
-	return b.buf, nil
+	return b.cachedBuf, nil
 }
 
 // store stores buf, an updated buffer, if its suitable to do so.
-func (b *buffer) store(buf []byte) error {
-	if b.length > 0 {
-		return ErrBusyBuffer
-	} else if cap(buf) <= maxPacketSize && cap(buf) > cap(b.buf) {
-		b.buf = buf[:cap(buf)]
+func (b *buffer) store(buf []byte) {
+	if cap(buf) <= maxCachedBufSize && cap(buf) > cap(b.cachedBuf) {
+		b.cachedBuf = buf[:cap(buf)]
 	}
-	return nil
 }