#!/bin/bash
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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.
#
# Tests that the dynamic symbols visible in the public client library
# (i.e. those available for runtime linking) are all approved Kudu symbols.

NM=`which nm`
if [ -n $NM ]; then
  echo "Found nm: $NM"
else
  echo "Cannot find nm on PATH: $PATH"
  exit 1
fi

if [[ "$OSTYPE" =~ ^linux ]]; then
  DYLIB_SUFFIX="so"
elif [[ "$OSTYPE" == "darwin"* ]]; then
  DYLIB_SUFFIX="dylib"
fi

LIB=$(dirname "$BASH_SOURCE")/../lib/exported/libkudu_client.$DYLIB_SUFFIX
if [ -r $LIB ]; then
  echo "Found kudu client library: $LIB"
else
  echo "Can't read kudu client library at $LIB"
  exit 1
fi

if [[ "$OSTYPE" =~ ^linux ]]; then
  NM_COMMAND="${NM} -D --defined-only --demangle ${LIB}"
elif [[ "$OSTYPE" == "darwin"* ]]; then
  NM_COMMAND="${NM} -U ${LIB} | c++filt"
fi

NUM_BAD_SYMS=0
while read ADDR TYPE SYMBOL; do
  # Skip all symbols that aren't strong and global.
  if [ "$TYPE" != "T" ]; then
    echo "Skipping non-strong and non-global symbol '$SYMBOL'"
    continue
  fi

  # Skip special symbols.
  if [ "$SYMBOL" = "_init" -o "$SYMBOL" = "_fini" ]; then
    echo "Skipping special symbol '$SYMBOL'"
    continue
  fi

  # Skip Kudu symbols. Using [[ ]] for regex support.
  if [[ "$SYMBOL" =~ ^kudu:: ]]; then
    echo "Skipping kudu symbol '$SYMBOL'"
    continue;
  fi

  # KUDU-455: Skip bizarro global symbol that remains when compiling with old gcc.
  if [ "$SYMBOL" = "__gnu_cxx::hash<StringPiece>::operator()(StringPiece) const" ]; then
    echo "Skipping KUDU-455 symbol '$SYMBOL'"
    continue
  fi

  # KUDU-3218: Skip transaction clone symbols coming from std.
  # TODO(KUDU-3218): Validate these are safe to ignore long term.
  if [[ "$SYMBOL" =~ ^"transaction clone for std::" ||
        "$SYMBOL" =~ ^"operator delete" ]]; then
    echo "Skipping transaction clone symbol (KUDU-3218) '$SYMBOL'"
    continue;
  fi

  # Any left over symbol is bad.
  echo "Found bad symbol '$SYMBOL'"
  NUM_BAD_SYMS=$((NUM_BAD_SYMS + 1))
done < <($NM_COMMAND)

if [ $NUM_BAD_SYMS -gt 0 ]; then
  echo "Kudu client library contains $NUM_BAD_SYMS bad symbols"
  exit 1
fi

exit 0