forked from graphql-java/graphql-java
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Execution.java
231 lines (198 loc) · 11.7 KB
/
Execution.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
package graphql.execution;
import graphql.ExecutionInput;
import graphql.ExecutionResult;
import graphql.ExecutionResultImpl;
import graphql.ExperimentalApi;
import graphql.GraphQLContext;
import graphql.GraphQLError;
import graphql.Internal;
import graphql.execution.incremental.IncrementalCallState;
import graphql.execution.instrumentation.Instrumentation;
import graphql.execution.instrumentation.InstrumentationContext;
import graphql.execution.instrumentation.InstrumentationState;
import graphql.execution.instrumentation.parameters.InstrumentationExecuteOperationParameters;
import graphql.execution.instrumentation.parameters.InstrumentationExecutionParameters;
import graphql.extensions.ExtensionsBuilder;
import graphql.incremental.DelayedIncrementalPartialResult;
import graphql.incremental.IncrementalExecutionResultImpl;
import graphql.language.Document;
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 graphql.schema.impl.SchemaUtil;
import org.reactivestreams.Publisher;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import static graphql.execution.ExecutionContextBuilder.newExecutionContextBuilder;
import static graphql.execution.ExecutionStepInfo.newExecutionStepInfo;
import static graphql.execution.ExecutionStrategyParameters.newParameters;
import static graphql.execution.instrumentation.SimpleInstrumentationContext.nonNullCtx;
import static java.util.concurrent.CompletableFuture.completedFuture;
@Internal
public class Execution {
private final FieldCollector fieldCollector = new FieldCollector();
private final ExecutionStrategy queryStrategy;
private final ExecutionStrategy mutationStrategy;
private final ExecutionStrategy subscriptionStrategy;
private final Instrumentation instrumentation;
private final ValueUnboxer valueUnboxer;
public Execution(ExecutionStrategy queryStrategy, ExecutionStrategy mutationStrategy, ExecutionStrategy subscriptionStrategy, Instrumentation instrumentation, ValueUnboxer valueUnboxer) {
this.queryStrategy = queryStrategy != null ? queryStrategy : new AsyncExecutionStrategy();
this.mutationStrategy = mutationStrategy != null ? mutationStrategy : new AsyncSerialExecutionStrategy();
this.subscriptionStrategy = subscriptionStrategy != null ? subscriptionStrategy : new AsyncExecutionStrategy();
this.instrumentation = instrumentation;
this.valueUnboxer = valueUnboxer;
}
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;
RawVariables inputVariables = executionInput.getRawVariables();
List<VariableDefinition> variableDefinitions = operationDefinition.getVariableDefinitions();
CoercedVariables coercedVariables;
try {
coercedVariables = ValuesResolver.coerceVariableValues(graphQLSchema, variableDefinitions, inputVariables, executionInput.getGraphQLContext(), executionInput.getLocale());
} 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())
.graphQLContext(executionInput.getGraphQLContext())
.localContext(executionInput.getLocalContext())
.root(executionInput.getRoot())
.fragmentsByName(fragmentsByName)
.coercedVariables(coercedVariables)
.document(document)
.operationDefinition(operationDefinition)
.dataLoaderRegistry(executionInput.getDataLoaderRegistry())
.locale(executionInput.getLocale())
.valueUnboxer(valueUnboxer)
.executionInput(executionInput)
.build();
InstrumentationExecutionParameters parameters = new InstrumentationExecutionParameters(
executionInput, graphQLSchema, instrumentationState
);
executionContext = instrumentation.instrumentExecutionContext(executionContext, parameters, instrumentationState);
return executeOperation(executionContext, executionInput.getRoot(), executionContext.getOperationDefinition());
}
private CompletableFuture<ExecutionResult> executeOperation(ExecutionContext executionContext, Object root, OperationDefinition operationDefinition) {
GraphQLContext graphQLContext = executionContext.getGraphQLContext();
addExtensionsBuilderNotPresent(graphQLContext);
InstrumentationExecuteOperationParameters instrumentationParams = new InstrumentationExecuteOperationParameters(executionContext);
InstrumentationContext<ExecutionResult> executeOperationCtx = nonNullCtx(instrumentation.beginExecuteOperation(instrumentationParams, executionContext.getInstrumentationState()));
OperationDefinition.Operation operation = operationDefinition.getOperation();
GraphQLObjectType operationRootType;
try {
operationRootType = SchemaUtil.getOperationRootType(executionContext.getGraphQLSchema(), operationDefinition);
} catch (RuntimeException rte) {
if (rte instanceof GraphQLError) {
ExecutionResult executionResult = new ExecutionResultImpl(Collections.singletonList((GraphQLError) rte));
CompletableFuture<ExecutionResult> resultCompletableFuture = completedFuture(executionResult);
executeOperationCtx.onDispatched(resultCompletableFuture);
executeOperationCtx.onCompleted(executionResult, rte);
return resultCompletableFuture;
}
throw rte;
}
FieldCollectorParameters collectorParameters = FieldCollectorParameters.newParameters()
.schema(executionContext.getGraphQLSchema())
.objectType(operationRootType)
.fragments(executionContext.getFragmentsByName())
.variables(executionContext.getCoercedVariables().toMap())
.graphQLContext(graphQLContext)
.build();
MergedSelectionSet fields = fieldCollector.collectFields(
collectorParameters,
operationDefinition.getSelectionSet(),
Optional.ofNullable(executionContext.getGraphQLContext())
.map(graphqlContext -> (Boolean) graphqlContext.get(ExperimentalApi.ENABLE_INCREMENTAL_SUPPORT))
.orElse(false)
);
ResultPath path = ResultPath.rootPath();
ExecutionStepInfo executionStepInfo = newExecutionStepInfo().type(operationRootType).path(path).build();
NonNullableFieldValidator nonNullableFieldValidator = new NonNullableFieldValidator(executionContext, executionStepInfo);
ExecutionStrategyParameters parameters = newParameters()
.executionStepInfo(executionStepInfo)
.source(root)
.localContext(executionContext.getLocalContext())
.fields(fields)
.nonNullFieldValidator(nonNullableFieldValidator)
.path(path)
.build();
CompletableFuture<ExecutionResult> result;
try {
ExecutionStrategy executionStrategy = executionContext.getStrategy(operation);
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 null value somewhere.
//
// The spec says we should return null for the data in this case
//
// https://spec.graphql.org/October2021/#sec-Handling-Field-Errors
//
result = completedFuture(new ExecutionResultImpl(null, executionContext.getErrors()));
}
// note this happens NOW - not when the result completes
executeOperationCtx.onDispatched(result);
// fill out extensions if we have them
result = result.thenApply(er -> mergeExtensionsBuilderIfPresent(er, graphQLContext));
result = result.whenComplete(executeOperationCtx::onCompleted);
return incrementalSupport(executionContext, result);
}
/*
* Adds the deferred publisher if it's needed at the end of the query. This is also a good time for the deferred code to start running
*/
private CompletableFuture<ExecutionResult> incrementalSupport(ExecutionContext executionContext, CompletableFuture<ExecutionResult> result) {
return result.thenApply(er -> {
IncrementalCallState incrementalCallState = executionContext.getIncrementalCallState();
if (incrementalCallState.getIncrementalCallsDetected()) {
// we start the rest of the query now to maximize throughput. We have the initial important results,
// and now we can start the rest of the calls as early as possible (even before someone subscribes)
Publisher<DelayedIncrementalPartialResult> publisher = incrementalCallState.startDeferredCalls();
return IncrementalExecutionResultImpl.fromExecutionResult(er)
// "hasNext" can, in theory, be "false" when all the incremental items are delivered in the
// first response payload. However, the current implementation will never result in this.
// The behaviour might change if we decide to make optimizations in the future.
.hasNext(true)
.incrementalItemPublisher(publisher)
.build();
}
return er;
});
}
private void addExtensionsBuilderNotPresent(GraphQLContext graphQLContext) {
Object builder = graphQLContext.get(ExtensionsBuilder.class);
if (builder == null) {
graphQLContext.put(ExtensionsBuilder.class, ExtensionsBuilder.newExtensionsBuilder());
}
}
private ExecutionResult mergeExtensionsBuilderIfPresent(ExecutionResult executionResult, GraphQLContext graphQLContext) {
Object builder = graphQLContext.get(ExtensionsBuilder.class);
if (builder instanceof ExtensionsBuilder) {
ExtensionsBuilder extensionsBuilder = (ExtensionsBuilder) builder;
Map<Object, Object> currentExtensions = executionResult.getExtensions();
if (currentExtensions != null) {
extensionsBuilder.addValues(currentExtensions);
}
executionResult = extensionsBuilder.setExtensions(executionResult);
}
return executionResult;
}
}