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fix(federation): merge errors for shared root fields correctly (#6355)
* fix(federation): merge errors for shared root fields correctly * Tests * aggregateerror message * Spread AggregateError in errors in ExecutionResult * Fix lint --------- Co-authored-by: enisdenjo <denis@denelop.com>
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--- | ||
'@graphql-tools/federation': patch | ||
--- | ||
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Handle errors coming from subgraphs correctly when a root field is shared by different subgraphs | ||
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- If subgraph A returns an error for `Query.foo`, and subgraph B returns the data, ignore the error and keep it for null fields. | ||
- If both subgraphs return errors, return them as `AggregateError` then return them to the gateway result. |
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import { GraphQLSchema, parse } from 'graphql'; | ||
import { IntrospectAndCompose, LocalGraphQLDataSource } from '@apollo/gateway'; | ||
import { buildSubgraphSchema } from '@apollo/subgraph'; | ||
import { createDefaultExecutor } from '@graphql-tools/delegate'; | ||
import { normalizedExecutor } from '@graphql-tools/executor'; | ||
import { isAsyncIterable } from '@graphql-tools/utils'; | ||
import { getStitchedSchemaFromSupergraphSdl } from '../src/supergraph'; | ||
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describe('Error handling', () => { | ||
let aResult: any; | ||
let bResult: any; | ||
const subgraphA = buildSubgraphSchema({ | ||
typeDefs: parse(/* GraphQL */ ` | ||
type Query { | ||
foo: Foo | ||
} | ||
type Foo @key(fields: "id") { | ||
id: ID! | ||
bar: String | ||
} | ||
`), | ||
resolvers: { | ||
Query: { | ||
foo() { | ||
return aResult; | ||
}, | ||
}, | ||
Foo: { | ||
__resolveReference(root) { | ||
return root; | ||
}, | ||
bar() { | ||
return 'Bar'; | ||
}, | ||
}, | ||
}, | ||
}); | ||
const subgraphB = buildSubgraphSchema({ | ||
typeDefs: parse(/* GraphQL */ ` | ||
type Query { | ||
foo: Foo | ||
} | ||
extend type Foo @key(fields: "id") { | ||
id: ID! | ||
baz: String | ||
} | ||
`), | ||
resolvers: { | ||
Query: { | ||
foo() { | ||
return bResult; | ||
}, | ||
}, | ||
Foo: { | ||
__resolveReference(root) { | ||
return root; | ||
}, | ||
baz() { | ||
return 'Baz'; | ||
}, | ||
}, | ||
}, | ||
}); | ||
let supergraph: GraphQLSchema; | ||
beforeAll(async () => { | ||
const { supergraphSdl } = await new IntrospectAndCompose({ | ||
subgraphs: [ | ||
{ | ||
name: 'A', | ||
url: 'http://localhost:4001/graphql', | ||
}, | ||
{ | ||
name: 'B', | ||
url: 'http://localhost:4002/graphql', | ||
}, | ||
], | ||
}).initialize({ | ||
getDataSource({ name }) { | ||
if (name === 'A') { | ||
return new LocalGraphQLDataSource(subgraphA); | ||
} | ||
if (name === 'B') { | ||
return new LocalGraphQLDataSource(subgraphB); | ||
} | ||
throw new Error(`Unknown subgraph: ${name}`); | ||
}, | ||
async healthCheck() {}, | ||
update() {}, | ||
}); | ||
supergraph = getStitchedSchemaFromSupergraphSdl({ | ||
supergraphSdl, | ||
onSubschemaConfig(subschemaConfig) { | ||
if (subschemaConfig.name === 'A') { | ||
subschemaConfig.executor = createDefaultExecutor(subgraphA); | ||
} else if (subschemaConfig.name === 'B') { | ||
subschemaConfig.executor = createDefaultExecutor(subgraphB); | ||
} else { | ||
throw new Error(`Unknown subgraph: ${subschemaConfig.name}`); | ||
} | ||
}, | ||
}); | ||
}); | ||
it('chooses the successful result from shared root fields', async () => { | ||
aResult = new Error('A failed'); | ||
bResult = { id: '1' }; | ||
const result = await normalizedExecutor({ | ||
schema: supergraph, | ||
document: parse(/* GraphQL */ ` | ||
query { | ||
foo { | ||
id | ||
bar | ||
baz | ||
} | ||
} | ||
`), | ||
}); | ||
if (isAsyncIterable(result)) { | ||
throw new Error('Expected result to be an ExecutionResult'); | ||
} | ||
expect(result.errors).toBeUndefined(); | ||
expect(result.data).toEqual({ | ||
foo: { | ||
id: '1', | ||
bar: null, | ||
baz: 'Baz', | ||
}, | ||
}); | ||
}); | ||
it('merges errors from shared root fields', async () => { | ||
aResult = new Error('A failed'); | ||
bResult = new Error('B failed'); | ||
const result = await normalizedExecutor({ | ||
schema: supergraph, | ||
document: parse(/* GraphQL */ ` | ||
query { | ||
foo { | ||
id | ||
bar | ||
baz | ||
} | ||
} | ||
`), | ||
}); | ||
if (isAsyncIterable(result)) { | ||
throw new Error('Expected result to be an ExecutionResult'); | ||
} | ||
expect(result.errors).toHaveLength(2); | ||
expect(result.errors).toContainEqual( | ||
expect.objectContaining({ | ||
message: 'A failed', | ||
}), | ||
); | ||
expect(result.errors).toContainEqual( | ||
expect.objectContaining({ | ||
message: 'B failed', | ||
}), | ||
); | ||
}); | ||
}); |