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package graphql.execution;
import graphql.ExecutionInput;
import graphql.ExecutionResult;
import graphql.ExecutionResultImpl;
import graphql.GraphQLError;
import graphql.Internal;
import graphql.MutationNotSupportedError;
import graphql.execution.instrumentation.Instrumentation;
import graphql.execution.instrumentation.InstrumentationContext;
import graphql.execution.instrumentation.InstrumentationState;
import graphql.execution.instrumentation.parameters.InstrumentationDataFetchParameters;
import graphql.execution.instrumentation.parameters.InstrumentationExecutionParameters;
import graphql.language.Document;
import graphql.language.Field;
import graphql.language.FragmentDefinition;
import graphql.language.NodeUtil;
import graphql.language.OperationDefinition;
import graphql.language.VariableDefinition;
import graphql.schema.GraphQLObjectType;
import graphql.schema.GraphQLSchema;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import static graphql.Assert.assertShouldNeverHappen;
import static graphql.execution.ExecutionContextBuilder.newExecutionContextBuilder;
import static graphql.execution.ExecutionStrategyParameters.newParameters;
import static graphql.execution.ExecutionTypeInfo.newTypeInfo;
import static graphql.language.OperationDefinition.Operation.MUTATION;
import static graphql.language.OperationDefinition.Operation.QUERY;
import static graphql.language.OperationDefinition.Operation.SUBSCRIPTION;
import static java.util.concurrent.CompletableFuture.completedFuture;
@Internal
public class Execution {
private static final Logger log = LoggerFactory.getLogger(Execution.class);
private final FieldCollector fieldCollector = new FieldCollector();
private final ExecutionStrategy queryStrategy;
private final ExecutionStrategy mutationStrategy;
private final ExecutionStrategy subscriptionStrategy;
private final Instrumentation instrumentation;
public Execution(ExecutionStrategy queryStrategy, ExecutionStrategy mutationStrategy, ExecutionStrategy subscriptionStrategy, Instrumentation instrumentation) {
this.queryStrategy = queryStrategy != null ? queryStrategy : new AsyncExecutionStrategy();
this.mutationStrategy = mutationStrategy != null ? mutationStrategy : new AsyncSerialExecutionStrategy();
this.subscriptionStrategy = subscriptionStrategy != null ? subscriptionStrategy : new AsyncExecutionStrategy();
this.instrumentation = instrumentation;
}
public CompletableFuture<ExecutionResult> execute(Document document, GraphQLSchema graphQLSchema, ExecutionId executionId, ExecutionInput executionInput, InstrumentationState instrumentationState) {
NodeUtil.GetOperationResult getOperationResult = NodeUtil.getOperation(document, executionInput.getOperationName());
Map<String, FragmentDefinition> fragmentsByName = getOperationResult.fragmentsByName;
OperationDefinition operationDefinition = getOperationResult.operationDefinition;
ValuesResolver valuesResolver = new ValuesResolver();
Map<String, Object> inputVariables = executionInput.getVariables();
List<VariableDefinition> variableDefinitions = operationDefinition.getVariableDefinitions();
Map<String, Object> coercedVariables;
try {
coercedVariables = valuesResolver.coerceArgumentValues(graphQLSchema, variableDefinitions, inputVariables);
} catch (RuntimeException rte) {
if (rte instanceof GraphQLError) {
return completedFuture(new ExecutionResultImpl((GraphQLError) rte));
}
throw rte;
}
ExecutionContext executionContext = newExecutionContextBuilder()
.instrumentation(instrumentation)
.instrumentationState(instrumentationState)
.executionId(executionId)
.graphQLSchema(graphQLSchema)
.queryStrategy(queryStrategy)
.mutationStrategy(mutationStrategy)
.subscriptionStrategy(subscriptionStrategy)
.context(executionInput.getContext())
.root(executionInput.getRoot())
.fragmentsByName(fragmentsByName)
.variables(coercedVariables)
.document(document)
.operationDefinition(operationDefinition)
.build();
InstrumentationExecutionParameters parameters = new InstrumentationExecutionParameters(
executionInput, graphQLSchema, instrumentationState
);
executionContext = instrumentation.instrumentExecutionContext(executionContext, parameters);
return executeOperation(executionContext, parameters, executionInput.getRoot(), executionContext.getOperationDefinition());
}
private CompletableFuture<ExecutionResult> executeOperation(ExecutionContext executionContext, InstrumentationExecutionParameters instrumentationExecutionParameters, Object root, OperationDefinition operationDefinition) {
InstrumentationDataFetchParameters dataFetchParameters = new InstrumentationDataFetchParameters(executionContext);
InstrumentationContext<CompletableFuture<ExecutionResult>> executionDispatchCtx = instrumentation.beginDataFetchDispatch(dataFetchParameters);
InstrumentationContext<ExecutionResult> dataFetchCtx = instrumentation.beginDataFetch(dataFetchParameters);
OperationDefinition.Operation operation = operationDefinition.getOperation();
GraphQLObjectType operationRootType = getOperationRootType(executionContext.getGraphQLSchema(), operation);
//
// do we have a mutation operation root type. The spec says if we don't then mutations are not allowed to be executed
//
// for the record earlier code has asserted that we have a query type in the schema since the spec says this is
// ALWAYS required
if (operation == MUTATION && operationRootType == null) {
CompletableFuture<ExecutionResult> resultCompletableFuture = completedFuture(new ExecutionResultImpl(Collections.singletonList(new MutationNotSupportedError())));
executionDispatchCtx.onEnd(resultCompletableFuture, null);
return resultCompletableFuture;
}
FieldCollectorParameters collectorParameters = FieldCollectorParameters.newParameters()
.schema(executionContext.getGraphQLSchema())
.objectType(operationRootType)
.fragments(executionContext.getFragmentsByName())
.variables(executionContext.getVariables())
.build();
Map<String, List<Field>> fields = fieldCollector.collectFields(collectorParameters, operationDefinition.getSelectionSet());
ExecutionPath path = ExecutionPath.rootPath();
ExecutionTypeInfo typeInfo = newTypeInfo().type(operationRootType).path(path).build();
NonNullableFieldValidator nonNullableFieldValidator = new NonNullableFieldValidator(executionContext, typeInfo);
ExecutionStrategyParameters parameters = newParameters()
.typeInfo(typeInfo)
.source(root)
.fields(fields)
.nonNullFieldValidator(nonNullableFieldValidator)
.path(path)
.build();
CompletableFuture<ExecutionResult> result;
try {
ExecutionStrategy executionStrategy;
if (operation == OperationDefinition.Operation.MUTATION) {
executionStrategy = mutationStrategy;
} else if (operation == SUBSCRIPTION) {
executionStrategy = subscriptionStrategy;
} else {
executionStrategy = queryStrategy;
}
log.debug("Executing '{}' query operation: '{}' using '{}' execution strategy", executionContext.getExecutionId(), operation, executionStrategy.getClass().getName());
result = executionStrategy.execute(executionContext, parameters);
} catch (NonNullableFieldWasNullException e) {
// this means it was non null types all the way from an offending non null type
// up to the root object type and there was a a null value some where.
//
// The spec says we should return null for the data in this case
//
// http://facebook.github.io/graphql/#sec-Errors-and-Non-Nullability
//
result = completedFuture(new ExecutionResultImpl(null, executionContext.getErrors()));
}
result = result.whenComplete(dataFetchCtx::onEnd);
// note this happens NOW - not when the result completes
executionDispatchCtx.onEnd(result, null);
return result;
}
private GraphQLObjectType getOperationRootType(GraphQLSchema graphQLSchema, OperationDefinition.Operation operation) {
if (operation == MUTATION) {
return graphQLSchema.getMutationType();
} else if (operation == QUERY) {
return graphQLSchema.getQueryType();
} else if (operation == SUBSCRIPTION) {
return graphQLSchema.getSubscriptionType();
} else {
return assertShouldNeverHappen("Unhandled case. An extra operation enum has been added without code support");
}
}
}