func testBinaryDatumType(t *testing.T, typ string, datumConstructor func(val string) parser.Datum) {
var tests []binaryTest
f, err := os.Open(filepath.Join("testdata", fmt.Sprintf("%s_test.json", typ)))
if err != nil {
t.Fatal(err)
}
if err := json.NewDecoder(f).Decode(&tests); err != nil {
t.Fatal(err)
}
f.Close()
buf := writeBuffer{bytecount: metric.NewCounter(metric.Metadata{})}
for _, test := range tests {
buf.wrapped.Reset()
d := datumConstructor(test.In)
oid, _ := sql.DatumToOid(d.ResolvedType())
func() {
defer func() {
if r := recover(); r != nil {
fmt.Printf("%q: %s", test.In, r)
panic(r)
}
}()
buf.writeBinaryDatum(d, time.UTC)
if buf.err != nil {
t.Fatal(buf.err)
}
if got := buf.wrapped.Bytes(); !bytes.Equal(got, test.Expect) {
t.Errorf("%q:\n\t%v found,\n\t%v expected", test.In, got, test.Expect)
} else if datum, err := decodeOidDatum(oid, formatBinary, got[4:]); err != nil {
t.Fatalf("unable to decode %v: %s", got[4:], err)
} else if d.Compare(datum) != 0 {
t.Errorf("expected %s, got %s", d, datum)
}
}()
}
}
func (c *v3Conn) handleParse(ctx context.Context, buf *readBuffer) error {
name, err := buf.getString()
if err != nil {
return err
}
// The unnamed prepared statement can be freely overwritten.
if name != "" {
if c.session.PreparedStatements.Exists(name) {
return c.sendInternalError(fmt.Sprintf("prepared statement %q already exists", name))
}
}
query, err := buf.getString()
if err != nil {
return err
}
// The client may provide type information for (some of) the
// placeholders. Read this first.
numQArgTypes, err := buf.getUint16()
if err != nil {
return err
}
inTypeHints := make([]oid.Oid, numQArgTypes)
for i := range inTypeHints {
typ, err := buf.getUint32()
if err != nil {
return err
}
inTypeHints[i] = oid.Oid(typ)
}
// Prepare the mapping of SQL placeholder names to
// types. Pre-populate it with the type hints received from the
// client, if any.
sqlTypeHints := make(parser.PlaceholderTypes)
for i, t := range inTypeHints {
if t == 0 {
continue
}
v, ok := sql.OidToDatum(t)
if !ok {
return c.sendInternalError(fmt.Sprintf("unknown oid type: %v", t))
}
sqlTypeHints[fmt.Sprint(i+1)] = v
}
// Create the new PreparedStatement in the connection's Session.
stmt, err := c.session.PreparedStatements.New(ctx, c.executor, name, query, sqlTypeHints)
if err != nil {
return c.sendError(err)
}
// Convert the inferred SQL types back to an array of pgwire Oids.
inTypes := make([]oid.Oid, 0, len(stmt.SQLTypes))
for k, t := range stmt.SQLTypes {
i, err := strconv.Atoi(k)
if err != nil || i < 1 {
return c.sendInternalError(fmt.Sprintf("invalid placeholder name: $%s", k))
}
// Placeholder names are 1-indexed; the arrays in the protocol are
// 0-indexed.
i--
// Grow inTypes to be at least as large as i. Prepopulate all
// slots with the hints provided, if any.
for j := len(inTypes); j <= i; j++ {
inTypes = append(inTypes, 0)
if j < len(inTypeHints) {
inTypes[j] = inTypeHints[j]
}
}
// OID to Datum is not a 1-1 mapping (for example, int4 and int8
// both map to TypeInt), so we need to maintain the types sent by
// the client.
if inTypes[i] != 0 {
continue
}
id, ok := sql.DatumToOid(t)
if !ok {
return c.sendInternalError(fmt.Sprintf("unknown datum type: %s", t))
}
inTypes[i] = id
}
for i, t := range inTypes {
if t == 0 {
return c.sendInternalError(
fmt.Sprintf("could not determine data type of placeholder $%d", i+1))
}
}
// Attach pgwire-specific metadata to the PreparedStatement.
stmt.ProtocolMeta = preparedStatementMeta{inTypes: inTypes}
c.writeBuf.initMsg(serverMsgParseComplete)
return c.writeBuf.finishMsg(c.wr)
}