mirror of https://github.com/jackc/pgx.git
123 lines
2.7 KiB
Go
123 lines
2.7 KiB
Go
package pgproto3
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import (
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"bytes"
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"math/rand"
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"testing"
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)
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func TestChunkReaderNextDoesNotReadIfAlreadyBuffered(t *testing.T) {
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server := &bytes.Buffer{}
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r := newChunkReader(server, 4)
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src := []byte{1, 2, 3, 4}
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server.Write(src)
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n1, err := r.Next(2)
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if err != nil {
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t.Fatal(err)
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}
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if bytes.Compare(n1, src[0:2]) != 0 {
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t.Fatalf("Expected read bytes to be %v, but they were %v", src[0:2], n1)
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}
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n2, err := r.Next(2)
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if err != nil {
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t.Fatal(err)
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}
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if bytes.Compare(n2, src[2:4]) != 0 {
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t.Fatalf("Expected read bytes to be %v, but they were %v", src[2:4], n2)
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}
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if bytes.Compare(r.buf, src) != 0 {
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t.Fatalf("Expected r.buf to be %v, but it was %v", src, r.buf)
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}
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_, err = r.Next(0) // Trigger the buffer reset.
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if err != nil {
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t.Fatal(err)
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}
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if r.rp != 0 {
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t.Fatalf("Expected r.rp to be %v, but it was %v", 0, r.rp)
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}
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if r.wp != 0 {
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t.Fatalf("Expected r.wp to be %v, but it was %v", 0, r.wp)
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}
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}
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func TestChunkReaderNextGetsBiggerBufAsNeededFromBigBufPools(t *testing.T) {
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server := &bytes.Buffer{}
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r := newChunkReader(server, 4)
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src := []byte{1, 2, 3, 4, 5, 6, 7, 8}
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server.Write(src)
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n1, err := r.Next(5)
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if err != nil {
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t.Fatal(err)
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}
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if bytes.Compare(n1, src[0:5]) != 0 {
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t.Fatalf("Expected read bytes to be %v, but they were %v", src[0:5], n1)
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}
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if len(r.buf) != bigBufPools[0].byteSize {
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t.Fatalf("Expected len(r.buf) to be %v, but it was %v", bigBufPools[0].byteSize, len(r.buf))
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}
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}
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func TestChunkReaderReusesBuf(t *testing.T) {
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server := &bytes.Buffer{}
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r := newChunkReader(server, 4)
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src := []byte{1, 2, 3, 4, 5, 6, 7, 8}
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server.Write(src)
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n1, err := r.Next(4)
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if err != nil {
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t.Fatal(err)
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}
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if bytes.Compare(n1, src[0:4]) != 0 {
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t.Fatalf("Expected read bytes to be %v, but they were %v", src[0:4], n1)
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}
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n2, err := r.Next(4)
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if err != nil {
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t.Fatal(err)
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}
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if bytes.Compare(n2, src[4:8]) != 0 {
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t.Fatalf("Expected read bytes to be %v, but they were %v", src[4:8], n2)
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}
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if bytes.Compare(n1, src[4:8]) != 0 {
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t.Fatalf("Expected slice to be reused, expected %v but it was %v", src[4:8], n1)
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}
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}
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type randomReader struct {
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rnd *rand.Rand
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}
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// Read reads a random number of random bytes.
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func (r *randomReader) Read(p []byte) (n int, err error) {
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n = r.rnd.Intn(len(p) + 1)
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return r.rnd.Read(p[:n])
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}
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func TestChunkReaderNextFuzz(t *testing.T) {
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rr := &randomReader{rnd: rand.New(rand.NewSource(1))}
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r := newChunkReader(rr, 8192)
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randomSizes := rand.New(rand.NewSource(0))
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for i := 0; i < 100000; i++ {
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size := randomSizes.Intn(16384) + 1
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buf, err := r.Next(size)
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if err != nil {
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t.Fatal(err)
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}
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if len(buf) != size {
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t.Fatalf("Expected to get %v bytes but got %v bytes", size, len(buf))
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}
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}
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}
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