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Presto Router
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/*
 * 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.
 */
package com.facebook.presto.router;

import com.facebook.airlift.json.JsonCodec;
import com.facebook.airlift.json.JsonCodecFactory;
import com.facebook.airlift.json.JsonObjectMapperProvider;
import com.facebook.presto.router.spec.RouterSpec;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Optional;

import static com.fasterxml.jackson.databind.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES;
import static java.lang.String.format;

public final class RouterUtil
{
    private static final JsonCodec CODEC = new JsonCodecFactory(
            () -> new JsonObjectMapperProvider().get().enable(FAIL_ON_UNKNOWN_PROPERTIES))
            .jsonCodec(RouterSpec.class);

    private RouterUtil() {}

    public static Optional parseRouterConfig(RouterConfig config)
    {
        Optional routerSpec;
        try {
            routerSpec = Optional.of(CODEC.fromJson(Files.readAllBytes(Paths.get(config.getConfigFile()))));
        }
        catch (IOException e) {
            throw new UncheckedIOException(e);
        }
        catch (IllegalArgumentException e) {
            handleConfigIllegalArgumentException(e);
            throw e;
        }

        return routerSpec;
    }

    private static void handleConfigIllegalArgumentException(IllegalArgumentException e)
    {
        Throwable cause = e.getCause();
        if (cause instanceof UnrecognizedPropertyException) {
            UnrecognizedPropertyException ex = (UnrecognizedPropertyException) cause;
            String message = format("Unknown property at line %s:%s: %s",
                    ex.getLocation().getLineNr(),
                    ex.getLocation().getColumnNr(),
                    ex.getPropertyName());
            throw new IllegalArgumentException(message, e);
        }
        if (cause instanceof JsonMappingException) {
            // remove the extra "through reference chain" message
            if (cause.getCause() != null) {
                cause = cause.getCause();
            }
            throw new IllegalArgumentException(cause.getMessage(), e);
        }
    }
}