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error.go
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error.go
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package kafka
/**
* Copyright 2016 Confluent 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.
*/
// Automatically generate error codes from librdkafka
// See README for instructions
//go:generate $GOPATH/bin/go_rdkafka_generr generated_errors.go
/*
#include <stdlib.h>
#include <librdkafka/rdkafka.h>
*/
import "C"
import (
"fmt"
"unsafe"
)
// Error provides a Kafka-specific error container
type Error struct {
code ErrorCode
str string
fatal bool
}
func newError(code C.rd_kafka_resp_err_t) (err Error) {
return Error{ErrorCode(code), "", false}
}
// NewError creates a new Error.
func NewError(code ErrorCode, str string, fatal bool) (err Error) {
return Error{code, str, fatal}
}
func newErrorFromString(code ErrorCode, str string) (err Error) {
return Error{code, str, false}
}
func newErrorFromCString(code C.rd_kafka_resp_err_t, cstr *C.char) (err Error) {
var str string
if cstr != nil {
str = C.GoString(cstr)
} else {
str = ""
}
return Error{ErrorCode(code), str, false}
}
func newCErrorFromString(code C.rd_kafka_resp_err_t, str string) (err Error) {
return newErrorFromString(ErrorCode(code), str)
}
// Error returns a human readable representation of an Error
// Same as Error.String()
func (e Error) Error() string {
return e.String()
}
// String returns a human readable representation of an Error
func (e Error) String() string {
var errstr string
if len(e.str) > 0 {
errstr = e.str
} else {
errstr = e.code.String()
}
if e.IsFatal() {
return fmt.Sprintf("Fatal error: %s", errstr)
}
return errstr
}
// Code returns the ErrorCode of an Error
func (e Error) Code() ErrorCode {
return e.code
}
// IsFatal returns true if the error is a fatal error.
// A fatal error indicates the client instance is no longer operable and
// should be terminated. Typical causes include non-recoverable
// idempotent producer errors.
func (e Error) IsFatal() bool {
return e.fatal
}
// getFatalError returns an Error object if the client instance has raised a fatal error, else nil.
func getFatalError(H Handle) error {
cErrstr := (*C.char)(C.malloc(C.size_t(512)))
defer C.free(unsafe.Pointer(cErrstr))
cErr := C.rd_kafka_fatal_error(H.gethandle().rk, cErrstr, 512)
if int(cErr) == 0 {
return nil
}
err := newErrorFromCString(cErr, cErrstr)
err.fatal = true
return err
}
// testFatalError triggers a fatal error in the underlying client.
// This is to be used strictly for testing purposes.
func testFatalError(H Handle, code ErrorCode, str string) ErrorCode {
return ErrorCode(C.rd_kafka_test_fatal_error(H.gethandle().rk, C.rd_kafka_resp_err_t(code), C.CString(str)))
}