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Implement MySQL Function TO_BASE64() and FROM_BASE64()

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This commit is contained in:
tj0
2021-12-01 11:06:39 +08:00
committed by LINxiansheng
parent dbdecb53a2
commit aa3637dac7
16 changed files with 833 additions and 45 deletions
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171
src/sql/engine/expr/ob_expr_to_base64.cpp Normal file
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/**
* Copyright (c) 2021 OceanBase
* OceanBase CE is licensed under Mulan PubL v2.
* You can use this software according to the terms and conditions of the Mulan PubL v2.
* You may obtain a copy of Mulan PubL v2 at:
* http://license.coscl.org.cn/MulanPubL-2.0
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
* See the Mulan PubL v2 for more details.
*/
#define USING_LOG_PREFIX SQL_ENG
#include "ob_expr_to_base64.h"
#include "sql/session/ob_sql_session_info.h"
#include "sql/engine/ob_exec_context.h"
#include "sql/engine/expr/ob_expr_util.h"
#include "lib/encode/ob_base64_encode.h"
#include "lib/oblog/ob_log.h"
using namespace oceanbase::common;
namespace oceanbase {
namespace sql {
ObExprToBase64::ObExprToBase64(ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_TO_BASE64, N_TO_BASE64, 1, NOT_ROW_DIMENSION)
{}
ObExprToBase64::~ObExprToBase64()
{}
int ObExprToBase64::calc(ObObj &result, const ObObj &obj, ObIAllocator *allocator)
{
int ret = OB_SUCCESS;
if (OB_ISNULL(allocator)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("null allocator", K(ret), K(allocator));
} else {
const ObString &in_raw = obj.get_string();
ObLength in_raw_len = in_raw.length();
const char *buf = in_raw.ptr();
int64_t buf_len = base64_needed_encoded_length(in_raw_len);
if (OB_UNLIKELY(buf_len == 0)) {
result.set_string(obj.get_type(), nullptr, 0);
} else {
int64_t pos = 0;
char *output_buf = static_cast<char *>(allocator->alloc(buf_len));
if (OB_ISNULL(output_buf)) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("failed to allocate memory", K(ret), K(buf_len), K(in_raw.length()));
} else if (OB_FAIL(ObBase64Encoder::encode(reinterpret_cast<const uint8_t *>(buf),
in_raw_len,
output_buf,
buf_len,
pos,
NUM_OF_CHAR_PER_LINE_QUOTED_PRINTABLE))) {
LOG_WARN("failed to encode base64", K(ret));
} else {
result.set_string(obj.get_type(), output_buf, pos);
}
}
}
return ret;
}
int ObExprToBase64::calc_result1(ObObj &result, const ObObj &obj, ObExprCtx &expr_ctx) const
{
int ret = OB_SUCCESS;
if (obj.is_null()) {
result.set_null();
} else if (OB_FAIL(calc(result, obj, expr_ctx.calc_buf_))) {
LOG_WARN("fail to calc function to_base64", K(ret), K(obj));
} else {
result.set_collation_level(obj.get_collation_level());
result.set_collation_type(get_result_type().get_collation_type());
}
return ret;
}
int ObExprToBase64::calc_result_type1(ObExprResType &type, ObExprResType &str, ObExprTypeCtx &type_ctx) const
{
int ret = OB_SUCCESS;
str.set_calc_type(ObVarcharType);
str.set_calc_collation_type(str.is_string_type() ? str.get_collation_type() : CS_TYPE_UTF8MB4_BIN);
int64_t mbmaxlen = 0;
int64_t max_result_length = 0;
if (OB_FAIL(common::ObCharset::get_mbmaxlen_by_coll(str.get_collation_type(), mbmaxlen))) {
LOG_WARN("fail to get mbmaxlen", K(str.get_collation_type()), K(ret));
} else {
max_result_length = (base64_needed_encoded_length(str.get_length()) - 1) * mbmaxlen;
if (max_result_length > MAX_BLOB_WIDTH) {
max_result_length = MAX_BLOB_WIDTH;
}
int64_t max_l = max_result_length / mbmaxlen;
int64_t max_deduce_length = max_l * mbmaxlen;
if (max_deduce_length < OB_MAX_MONITOR_INFO_LENGTH) {
type.set_varchar();
type.set_length(max_deduce_length);
type.set_collation_type(get_default_collation_type(type.get_type(), *type_ctx.get_session()));
} else {
type.set_blob();
// TODO : Fixme the blob type do not need to set_length.
// Maybe need wait ObDDLResolver::check_text_length fix the judge of length.
type.set_length(max_deduce_length);
type.set_collation_type(get_default_collation_type(type.get_type(), *type_ctx.get_session()));
}
type.set_collation_level(CS_LEVEL_COERCIBLE);
}
return ret;
}
int ObExprToBase64::eval_to_base64(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
{
int ret = OB_SUCCESS;
ObDatum *arg = nullptr;
ObExecContext* exec_ctx = &ctx.exec_ctx_;
if (OB_FAIL(expr.args_[0]->eval(ctx, arg))) {
LOG_WARN("eval arg failed", K(ret));
} else if (OB_UNLIKELY(arg->is_null())) {
res.set_null();
} else {
const ObString &in_raw = arg->get_string();
ObLength in_raw_len = in_raw.length();
const char *buf = in_raw.ptr();
char *output_buf = nullptr;
int64_t buf_len = base64_needed_encoded_length(in_raw_len);
if (OB_UNLIKELY(buf_len == 0)) {
res.set_string(nullptr, 0);
} else {
int64_t pos = 0;
output_buf = static_cast<char *>(exec_ctx->get_allocator().alloc(buf_len));
if (OB_ISNULL(output_buf)) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("failed to allocate memory", K(ret), K(buf_len), K(in_raw.length()));
} else if (OB_FAIL(ObBase64Encoder::encode(reinterpret_cast<const uint8_t *>(buf),
in_raw_len,
output_buf,
buf_len,
pos,
NUM_OF_CHAR_PER_LINE_QUOTED_PRINTABLE))) {
LOG_WARN("failed to encode base64", K(ret));
} else {
res.set_string(output_buf, pos);
if (OB_FAIL(ObExprUtil::set_expr_ascii_result(expr, ctx, res, ObString(pos, output_buf)))) {
LOG_WARN("set ASCII result failed", K(ret));
}
}
}
}
return ret;
}
int ObExprToBase64::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr, ObExpr &rt_expr) const
{
UNUSED(expr_cg_ctx);
UNUSED(raw_expr);
int ret = OB_SUCCESS;
rt_expr.eval_func_ = ObExprToBase64::eval_to_base64;
return ret;
}
} // namespace sql
} // namespace oceanbase