| /* |
| * 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. |
| */ |
| package org.apache.tinkerpop.gremlin.server.op; |
| |
| import com.codahale.metrics.Meter; |
| import com.codahale.metrics.Timer; |
| import org.apache.tinkerpop.gremlin.driver.Tokens; |
| import org.apache.tinkerpop.gremlin.driver.message.RequestMessage; |
| import org.apache.tinkerpop.gremlin.driver.message.ResponseMessage; |
| import org.apache.tinkerpop.gremlin.driver.message.ResponseStatusCode; |
| import org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor; |
| import org.apache.tinkerpop.gremlin.groovy.jsr223.customizer.TimedInterruptTimeoutException; |
| import org.apache.tinkerpop.gremlin.process.traversal.Operator; |
| import org.apache.tinkerpop.gremlin.process.traversal.Order; |
| import org.apache.tinkerpop.gremlin.process.traversal.Pop; |
| import org.apache.tinkerpop.gremlin.process.traversal.Scope; |
| import org.apache.tinkerpop.gremlin.server.OpProcessor; |
| import org.apache.tinkerpop.gremlin.server.handler.GremlinResponseFrameEncoder; |
| import org.apache.tinkerpop.gremlin.structure.Column; |
| import org.apache.tinkerpop.gremlin.structure.T; |
| import org.apache.tinkerpop.gremlin.server.Context; |
| import org.apache.tinkerpop.gremlin.server.GremlinServer; |
| import org.apache.tinkerpop.gremlin.server.Settings; |
| import org.apache.tinkerpop.gremlin.server.util.MetricManager; |
| import org.apache.tinkerpop.gremlin.util.function.ThrowingConsumer; |
| import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils; |
| import io.netty.channel.ChannelHandlerContext; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.script.Bindings; |
| import javax.script.SimpleBindings; |
| import java.util.Arrays; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.TimeoutException; |
| import java.util.function.Supplier; |
| import java.util.regex.Pattern; |
| |
| import static com.codahale.metrics.MetricRegistry.name; |
| |
| /** |
| * A base {@link org.apache.tinkerpop.gremlin.server.OpProcessor} implementation that helps with operations that deal |
| * with script evaluation functions. |
| * |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| */ |
| public abstract class AbstractEvalOpProcessor extends AbstractOpProcessor { |
| private static final Logger logger = LoggerFactory.getLogger(AbstractEvalOpProcessor.class); |
| public static final Timer evalOpTimer = MetricManager.INSTANCE.getTimer(name(GremlinServer.class, "op", "eval")); |
| |
| /** |
| * Captures the "error" count as a reportable metric for Gremlin Server. |
| * |
| * @deprecated As of release 3.1.1-incubating, not replaced. Direct usage is discouraged with sub-classes as |
| * error counts are captured more globally for error messages written down the pipeline to |
| * {@link GremlinResponseFrameEncoder}. |
| */ |
| @Deprecated |
| static final Meter errorMeter = MetricManager.INSTANCE.getMeter(name(GremlinServer.class, "errors")); |
| |
| /** |
| * Regex for validating that binding variables. |
| * |
| * @deprecated As of release 3.1.2-incubating, not replaced. This {@code Pattern} is not used internally. |
| * Deprecated rather than just removing as it's possible that someone else might be using it when developing |
| * custom {@link OpProcessor} implementations. |
| */ |
| @Deprecated |
| protected static final Pattern validBindingName = Pattern.compile("[a-zA-Z$_][a-zA-Z0-9$_]*"); |
| |
| /** |
| * This may or may not be the full set of invalid binding keys. It is dependent on the static imports made to |
| * Gremlin Server. This should get rid of the worst offenders though and provide a good message back to the |
| * calling client. |
| * <p/> |
| * Use of {@code toUpperCase()} on the accessor values of {@link T} solves an issue where the {@code ScriptEngine} |
| * ignores private scope on {@link T} and imports static fields. |
| */ |
| protected static final Set<String> INVALID_BINDINGS_KEYS = new HashSet<>(); |
| |
| static { |
| INVALID_BINDINGS_KEYS.addAll(Arrays.asList( |
| T.id.name(), T.key.name(), |
| T.label.name(), T.value.name(), |
| T.id.getAccessor(), T.key.getAccessor(), |
| T.label.getAccessor(), T.value.getAccessor(), |
| T.id.getAccessor().toUpperCase(), T.key.getAccessor().toUpperCase(), |
| T.label.getAccessor().toUpperCase(), T.value.getAccessor().toUpperCase())); |
| |
| for (Column enumItem : Column.values()) { |
| INVALID_BINDINGS_KEYS.add(enumItem.name()); |
| } |
| |
| for (Order enumItem : Order.values()) { |
| INVALID_BINDINGS_KEYS.add(enumItem.name()); |
| } |
| |
| for (Operator enumItem : Operator.values()) { |
| INVALID_BINDINGS_KEYS.add(enumItem.name()); |
| } |
| |
| for (Scope enumItem : Scope.values()) { |
| INVALID_BINDINGS_KEYS.add(enumItem.name()); |
| } |
| |
| for (Pop enumItem : Pop.values()) { |
| INVALID_BINDINGS_KEYS.add(enumItem.name()); |
| } |
| } |
| |
| protected AbstractEvalOpProcessor(final boolean manageTransactions) { |
| super(manageTransactions); |
| } |
| |
| /** |
| * Provides an operation for evaluating a Gremlin script. |
| */ |
| public abstract ThrowingConsumer<Context> getEvalOp(); |
| |
| /** |
| * A sub-class may have additional "ops" that it will service. Calls to {@link #select(Context)} that are not |
| * handled will be passed to this method to see if the sub-class can service the requested op code. |
| */ |
| public abstract Optional<ThrowingConsumer<Context>> selectOther(final RequestMessage requestMessage) throws OpProcessorException; |
| |
| @Override |
| public ThrowingConsumer<Context> select(final Context ctx) throws OpProcessorException { |
| final RequestMessage message = ctx.getRequestMessage(); |
| logger.debug("Selecting processor for RequestMessage {}", message); |
| |
| final ThrowingConsumer<Context> op; |
| switch (message.getOp()) { |
| case Tokens.OPS_EVAL: |
| op = validateEvalMessage(message).orElse(getEvalOp()); |
| break; |
| case Tokens.OPS_INVALID: |
| final String msgInvalid = String.format("Message could not be parsed. Check the format of the request. [%s]", message); |
| throw new OpProcessorException(msgInvalid, ResponseMessage.build(message).code(ResponseStatusCode.REQUEST_ERROR_MALFORMED_REQUEST).statusMessage(msgInvalid).create()); |
| default: |
| op = selectOther(message).orElseThrow(() -> { |
| final String msgDefault = String.format("Message with op code [%s] is not recognized.", message.getOp()); |
| return new OpProcessorException(msgDefault, ResponseMessage.build(message).code(ResponseStatusCode.REQUEST_ERROR_MALFORMED_REQUEST).statusMessage(msgDefault).create()); |
| }); |
| } |
| |
| return op; |
| } |
| |
| protected Optional<ThrowingConsumer<Context>> validateEvalMessage(final RequestMessage message) throws OpProcessorException { |
| if (!message.optionalArgs(Tokens.ARGS_GREMLIN).isPresent()) { |
| final String msg = String.format("A message with an [%s] op code requires a [%s] argument.", Tokens.OPS_EVAL, Tokens.ARGS_GREMLIN); |
| throw new OpProcessorException(msg, ResponseMessage.build(message).code(ResponseStatusCode.REQUEST_ERROR_INVALID_REQUEST_ARGUMENTS).statusMessage(msg).create()); |
| } |
| |
| if (message.optionalArgs(Tokens.ARGS_BINDINGS).isPresent()) { |
| final Map bindings = (Map) message.getArgs().get(Tokens.ARGS_BINDINGS); |
| if (bindings.keySet().stream().anyMatch(k -> null == k || !(k instanceof String))) { |
| final String msg = String.format("The [%s] message is using one or more invalid binding keys - they must be of type String and cannot be null", Tokens.OPS_EVAL); |
| throw new OpProcessorException(msg, ResponseMessage.build(message).code(ResponseStatusCode.REQUEST_ERROR_INVALID_REQUEST_ARGUMENTS).statusMessage(msg).create()); |
| } |
| |
| final Set<String> badBindings = IteratorUtils.set(IteratorUtils.<String>filter(bindings.keySet().iterator(), INVALID_BINDINGS_KEYS::contains)); |
| if (!badBindings.isEmpty()) { |
| final String msg = String.format("The [%s] message supplies one or more invalid parameters key of [%s] - these are reserved names.", Tokens.OPS_EVAL, badBindings); |
| throw new OpProcessorException(msg, ResponseMessage.build(message).code(ResponseStatusCode.REQUEST_ERROR_INVALID_REQUEST_ARGUMENTS).statusMessage(msg).create()); |
| } |
| } |
| |
| return Optional.empty(); |
| } |
| |
| /** |
| * A generalized implementation of the "eval" operation. It handles script evaluation and iteration of results |
| * so as to write {@link ResponseMessage} objects down the Netty pipeline. It also handles script timeouts, |
| * iteration timeouts, metrics and building bindings. Note that result iteration is delegated to the |
| * {@link #handleIterator} method, so those extending this class could override that method for better control |
| * over result iteration. |
| * |
| * @param context The current Gremlin Server {@link Context} |
| * @param gremlinExecutorSupplier A function that returns the {@link GremlinExecutor} to use in executing the |
| * script evaluation. |
| * @param bindingsSupplier A function that returns the {@link Bindings} to provide to the |
| * {@link GremlinExecutor#eval} method. |
| */ |
| protected void evalOpInternal(final Context context, final Supplier<GremlinExecutor> gremlinExecutorSupplier, |
| final BindingSupplier bindingsSupplier) throws OpProcessorException { |
| final Timer.Context timerContext = evalOpTimer.time(); |
| final ChannelHandlerContext ctx = context.getChannelHandlerContext(); |
| final RequestMessage msg = context.getRequestMessage(); |
| final GremlinExecutor gremlinExecutor = gremlinExecutorSupplier.get(); |
| final Settings settings = context.getSettings(); |
| |
| final Map<String, Object> args = msg.getArgs(); |
| |
| final String script = (String) args.get(Tokens.ARGS_GREMLIN); |
| final String language = args.containsKey(Tokens.ARGS_LANGUAGE) ? (String) args.get(Tokens.ARGS_LANGUAGE) : null; |
| final Bindings bindings = new SimpleBindings(); |
| |
| // sessionless requests are always transaction managed, but in-session requests are configurable. |
| final boolean managedTransactionsForRequest = manageTransactions ? |
| true : (Boolean) args.getOrDefault(Tokens.ARGS_MANAGE_TRANSACTION, false); |
| |
| // timeout override |
| final long seto = args.containsKey(Tokens.ARGS_SCRIPT_EVAL_TIMEOUT) ? |
| Long.parseLong(args.get(Tokens.ARGS_SCRIPT_EVAL_TIMEOUT).toString()) : settings.scriptEvaluationTimeout; |
| |
| final GremlinExecutor.LifeCycle lifeCycle = GremlinExecutor.LifeCycle.build() |
| .scriptEvaluationTimeoutOverride(seto) |
| .afterFailure((b,t) -> { |
| if (managedTransactionsForRequest) attemptRollback(msg, context.getGraphManager(), settings.strictTransactionManagement); |
| }) |
| .beforeEval(b -> { |
| try { |
| b.putAll(bindingsSupplier.get()); |
| } catch (OpProcessorException ope) { |
| // this should bubble up in the GremlinExecutor properly as the RuntimeException will be |
| // unwrapped and the root cause thrown |
| throw new RuntimeException(ope); |
| } |
| }) |
| .withResult(o -> { |
| final Iterator itty = IteratorUtils.asIterator(o); |
| |
| logger.debug("Preparing to iterate results from - {} - in thread [{}]", msg, Thread.currentThread().getName()); |
| |
| try { |
| handleIterator(context, itty); |
| } catch (TimeoutException ex) { |
| final String errorMessage = String.format("Response iteration exceeded the configured threshold for request [%s] - %s", msg, ex.getMessage()); |
| logger.warn(errorMessage); |
| ctx.writeAndFlush(ResponseMessage.build(msg).code(ResponseStatusCode.SERVER_ERROR_TIMEOUT).statusMessage(errorMessage).create()); |
| if (managedTransactionsForRequest) attemptRollback(msg, context.getGraphManager(), settings.strictTransactionManagement); |
| } catch (InterruptedException ex) { |
| logger.warn(String.format("Interruption during result iteration on request [%s].", msg), ex); |
| final String exceptionMsg = ex.getMessage(); |
| final String err = "Interruption of result iteration" + (null == exceptionMsg || exceptionMsg.isEmpty() ? "" : " - " + exceptionMsg); |
| ctx.writeAndFlush(ResponseMessage.build(msg).code(ResponseStatusCode.SERVER_ERROR).statusMessage(err).create()); |
| if (managedTransactionsForRequest) attemptRollback(msg, context.getGraphManager(), settings.strictTransactionManagement); |
| } catch (Exception ex) { |
| logger.warn(String.format("Exception processing a script on request [%s].", msg), ex); |
| final String err = ex.getMessage(); |
| ctx.writeAndFlush(ResponseMessage.build(msg).code(ResponseStatusCode.SERVER_ERROR) |
| .statusMessage(null == err || err.isEmpty() ? ex.getClass().getSimpleName() : err).create()); |
| if (managedTransactionsForRequest) attemptRollback(msg, context.getGraphManager(), settings.strictTransactionManagement); |
| } |
| }).create(); |
| |
| final CompletableFuture<Object> evalFuture = gremlinExecutor.eval(script, language, bindings, lifeCycle); |
| |
| evalFuture.handle((v, t) -> { |
| timerContext.stop(); |
| |
| if (t != null) { |
| if (t instanceof OpProcessorException) { |
| ctx.writeAndFlush(((OpProcessorException) t).getResponseMessage()); |
| } else if (t instanceof TimedInterruptTimeoutException) { |
| // occurs when the TimedInterruptCustomizerProvider is in play |
| final String errorMessage = String.format("A timeout occurred within the script during evaluation of [%s] - consider increasing the limit given to TimedInterruptCustomizerProvider", msg); |
| logger.warn(errorMessage); |
| ctx.writeAndFlush(ResponseMessage.build(msg).code(ResponseStatusCode.SERVER_ERROR_TIMEOUT).statusMessage("Timeout during script evaluation triggered by TimedInterruptCustomizerProvider").create()); |
| } else if (t instanceof TimeoutException) { |
| final String errorMessage = String.format("Response evaluation exceeded the configured threshold for request [%s] - %s", msg, t.getMessage()); |
| logger.warn(errorMessage, t); |
| ctx.writeAndFlush(ResponseMessage.build(msg).code(ResponseStatusCode.SERVER_ERROR_TIMEOUT).statusMessage(t.getMessage()).create()); |
| } else { |
| logger.warn(String.format("Exception processing a script on request [%s].", msg), t); |
| ctx.writeAndFlush(ResponseMessage.build(msg).code(ResponseStatusCode.SERVER_ERROR_SCRIPT_EVALUATION).statusMessage(t.getMessage()).create()); |
| } |
| } |
| |
| return null; |
| }); |
| } |
| |
| @FunctionalInterface |
| public interface BindingSupplier { |
| public Bindings get() throws OpProcessorException; |
| } |
| } |