98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
package pgproto3
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import (
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"encoding/binary"
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"encoding/hex"
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"encoding/json"
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"github.com/jackc/pgx/v5/internal/pgio"
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)
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type FunctionCallResponse struct {
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Result []byte
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}
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// Backend identifies this message as sendable by the PostgreSQL backend.
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func (*FunctionCallResponse) Backend() {}
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// Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
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// type identifier and 4 byte message length.
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func (dst *FunctionCallResponse) Decode(src []byte) error {
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if len(src) < 4 {
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return &invalidMessageFormatErr{messageType: "FunctionCallResponse"}
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}
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rp := 0
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resultSize := int(binary.BigEndian.Uint32(src[rp:]))
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rp += 4
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if resultSize == -1 {
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dst.Result = nil
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return nil
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}
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if len(src[rp:]) != resultSize {
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return &invalidMessageFormatErr{messageType: "FunctionCallResponse"}
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}
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dst.Result = src[rp:]
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return nil
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}
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// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
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func (src *FunctionCallResponse) Encode(dst []byte) ([]byte, error) {
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dst, sp := beginMessage(dst, 'V')
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if src.Result == nil {
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dst = pgio.AppendInt32(dst, -1)
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} else {
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dst = pgio.AppendInt32(dst, int32(len(src.Result)))
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dst = append(dst, src.Result...)
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}
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return finishMessage(dst, sp)
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}
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// MarshalJSON implements encoding/json.Marshaler.
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func (src FunctionCallResponse) MarshalJSON() ([]byte, error) {
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var formattedValue map[string]string
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var hasNonPrintable bool
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for _, b := range src.Result {
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if b < 32 {
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hasNonPrintable = true
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break
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}
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}
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if hasNonPrintable {
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formattedValue = map[string]string{"binary": hex.EncodeToString(src.Result)}
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} else {
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formattedValue = map[string]string{"text": string(src.Result)}
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}
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return json.Marshal(struct {
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Type string
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Result map[string]string
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}{
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Type: "FunctionCallResponse",
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Result: formattedValue,
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})
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}
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// UnmarshalJSON implements encoding/json.Unmarshaler.
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func (dst *FunctionCallResponse) UnmarshalJSON(data []byte) error {
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// Ignore null, like in the main JSON package.
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if string(data) == "null" {
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return nil
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}
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var msg struct {
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Result map[string]string
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}
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err := json.Unmarshal(data, &msg)
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if err != nil {
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return err
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}
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dst.Result, err = getValueFromJSON(msg.Result)
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return err
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}
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