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src/share/ob_kv_parser.cpp

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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 SHARE
+
+#include <string.h>
+#include <ctype.h>
+#include "ob_kv_parser.h"
+
+using namespace oceanbase::common;
+
+namespace oceanbase {
+namespace share {
+
+int ObKVParser::match(int sym)
+{
+  int ret = OB_SUCCESS;
+  if (sym != token_) {
+    ret = OB_INVALID_ARGUMENT;
+  } else {
+    ret = get_token();
+  }
+  return ret;
+}
+
+int ObKVParser::emit(int sym)
+{
+  int ret = OB_SUCCESS;
+  if (sym != token_) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("invalid arg", K(sym), K_(token), K(ret));
+  } else {
+    if (sym == SYM_VALUE && NULL != cb_) {
+      if (OB_FAIL(cb_->match(key_buf_, value_buf_))) {
+        LOG_WARN("fail match callback", K_(key_buf), K_(value_buf));
+      }
+    }
+    if (OB_SUCC(ret)) {
+      ret = get_token();
+    }
+  }
+  return ret;
+}
+
+int ObKVParser::get_token()
+{
+  int ret = OB_SUCCESS;
+  while (OB_SUCC(ret)) {
+    if ('\0' == *cur_) {  // NOTE: When encountering 0, always end, ignore data_length
+      token_ = SYM_END;
+      break;
+    } else if (data_length_ <= cur_ - data_) {
+      token_ = SYM_END;
+      break;
+    } else if (SYM_KV_SEP == *cur_) {
+      cur_++;
+      token_ = SYM_KV_SEP;
+      break;
+    } else if (SYM_PAIR_SEP == *cur_) {
+      cur_++;
+      token_ = SYM_PAIR_SEP;
+      break;
+    } else if (isspace(*cur_)) {
+      if (allow_space_) {
+        cur_++;  // Skip the spaces before and after the token
+      } else {
+        ret = OB_INVALID_ARGUMENT;
+      }
+    } else if (isprint(*cur_)) {
+      const char* start = cur_;
+      while (isprint(*cur_) && !isspace(*cur_) && SYM_KV_SEP != *cur_ && SYM_PAIR_SEP != *cur_) {
+        cur_++;
+      }
+      if (cur_ - start >= MAX_TOKEN_SIZE) {
+        ret = OB_SIZE_OVERFLOW;
+        LOG_WARN("token size is too large", "actual", cur_ - start, K(ret));
+      } else {
+        if (SYM_KV_SEP == token_) {
+          // value part
+          STRNCPY(value_buf_, start, cur_ - start);
+          value_buf_[cur_ - start] = '\0';
+        } else {
+          // key part
+          STRNCPY(key_buf_, start, cur_ - start);
+          key_buf_[cur_ - start] = '\0';
+        }
+        token_ = SYM_VALUE;
+      }
+      break;
+    } else {
+      // Unknown character
+      ret = OB_INVALID_ARGUMENT;
+      LOG_WARN("unexpected char", "c", *cur_, K(ret));
+    }
+  }
+  return ret;
+}
+
+int ObKVParser::parse(const char* data)
+{
+  int64_t data_length = STRLEN(data);
+  return parse(data, data_length);
+}
+
+int ObKVParser::parse(const char* data, int64_t data_length)
+{
+  int ret = OB_SUCCESS;
+  bool finish = false;
+  if (OB_ISNULL(data)) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("null data ptr", K(ret));
+  } else {
+    cur_ = data;
+    data_length_ = data_length;
+    data_ = data;
+    if (OB_FAIL(get_token())) {
+      LOG_WARN("failed to  get_token", K(ret));
+    }
+  }
+  while (OB_SUCC(ret) && !finish) {
+    if (SYM_END == token_) {
+      if (OB_FAIL(match(SYM_END))) {
+        LOG_WARN("fail match SYM_END");
+      } else {
+        finish = true;
+      }
+    } else if (SYM_VALUE == token_) {
+      if (OB_FAIL(kv_pair())) {
+        LOG_WARN("fail match kv");
+      }
+    } else if (SYM_PAIR_SEP == token_) {
+      if (OB_FAIL(match(SYM_PAIR_SEP))) {
+        LOG_WARN("fail match SYM_PAIR_SEP");
+      } else if (OB_FAIL(kv_pair())) {
+        LOG_WARN("fail match kv");
+      }
+    } else {
+      ret = OB_INVALID_ARGUMENT;
+      LOG_WARN("failed to parse", K(ret), K(token_));
+    }
+  }
+  if (OB_SUCC(ret) && NULL != cb_) {
+    if (false == cb_->check()) {
+      ret = OB_INVALID_ARGUMENT;
+      LOG_WARN("fail check parsed data", K(ret));
+    }
+  }
+  return ret;
+}
+
+int ObKVParser::kv_pair()
+{
+  int ret = OB_SUCCESS;
+  switch (token_) {
+    case SYM_VALUE:
+      if (OB_FAIL(match(SYM_VALUE))) {
+        LOG_WARN("fail match key");
+      } else if (OB_FAIL(match(SYM_KV_SEP))) {
+        LOG_WARN("fail match kv seperator");
+      } else if (OB_FAIL(emit(SYM_VALUE))) {
+        LOG_WARN("fail match value");
+      }
+      break;
+    default:
+      ret = OB_INVALID_ARGUMENT;
+      break;
+  }
+  return ret;
+}
+
+}  // namespace share
+}  // namespace oceanbase