AppSync / Client / create_resolver

create_resolver#

AppSync.Client.create_resolver(**kwargs)#

Creates a Resolver object.

A resolver converts incoming requests into a format that a data source can understand, and converts the data source’s responses into GraphQL.

See also: AWS API Documentation

Request Syntax

response = client.create_resolver(
    apiId='string',
    typeName='string',
    fieldName='string',
    dataSourceName='string',
    requestMappingTemplate='string',
    responseMappingTemplate='string',
    kind='UNIT'|'PIPELINE',
    pipelineConfig={
        'functions': [
            'string',
        ]
    },
    syncConfig={
        'conflictHandler': 'OPTIMISTIC_CONCURRENCY'|'LAMBDA'|'AUTOMERGE'|'NONE',
        'conflictDetection': 'VERSION'|'NONE',
        'lambdaConflictHandlerConfig': {
            'lambdaConflictHandlerArn': 'string'
        }
    },
    cachingConfig={
        'ttl': 123,
        'cachingKeys': [
            'string',
        ]
    },
    maxBatchSize=123,
    runtime={
        'name': 'APPSYNC_JS',
        'runtimeVersion': 'string'
    },
    code='string',
    metricsConfig='ENABLED'|'DISABLED'
)
Parameters:

  • apiId (string) –

    [REQUIRED]

    The ID for the GraphQL API for which the resolver is being created.

  • typeName (string) –

    [REQUIRED]

    The name of the Type.

  • fieldName (string) –

    [REQUIRED]

    The name of the field to attach the resolver to.

  • dataSourceName (string) – The name of the data source for which the resolver is being created.

  • requestMappingTemplate (string) –

    The mapping template to use for requests.

    A resolver uses a request mapping template to convert a GraphQL expression into a format that a data source can understand. Mapping templates are written in Apache Velocity Template Language (VTL).

    VTL request mapping templates are optional when using an Lambda data source. For all other data sources, VTL request and response mapping templates are required.

  • responseMappingTemplate (string) – The mapping template to use for responses from the data source.

  • kind (string) –

    The resolver type.

    • UNIT: A UNIT resolver type. A UNIT resolver is the default resolver type. You can use a UNIT resolver to run a GraphQL query against a single data source.

    • PIPELINE: A PIPELINE resolver type. You can use a PIPELINE resolver to invoke a series of Function objects in a serial manner. You can use a pipeline resolver to run a GraphQL query against multiple data sources.

  • pipelineConfig (dict) –

    The PipelineConfig.

    • functions (list) –

      A list of Function objects.

      • (string) –

  • syncConfig (dict) –

    The SyncConfig for a resolver attached to a versioned data source.

    • conflictHandler (string) –

      The Conflict Resolution strategy to perform in the event of a conflict.

      • OPTIMISTIC_CONCURRENCY: Resolve conflicts by rejecting mutations when versions don’t match the latest version at the server.

      • AUTOMERGE: Resolve conflicts with the Automerge conflict resolution strategy.

      • LAMBDA: Resolve conflicts with an Lambda function supplied in the LambdaConflictHandlerConfig.

    • conflictDetection (string) –

      The Conflict Detection strategy to use.

      • VERSION: Detect conflicts based on object versions for this resolver.

      • NONE: Do not detect conflicts when invoking this resolver.

    • lambdaConflictHandlerConfig (dict) –

      The LambdaConflictHandlerConfig when configuring LAMBDA as the Conflict Handler.

      • lambdaConflictHandlerArn (string) –

        The Amazon Resource Name (ARN) for the Lambda function to use as the Conflict Handler.

  • cachingConfig (dict) –

    The caching configuration for the resolver.

    • ttl (integer) – [REQUIRED]

      The TTL in seconds for a resolver that has caching activated.

      Valid values are 1–3,600 seconds.

    • cachingKeys (list) –

      The caching keys for a resolver that has caching activated.

      Valid values are entries from the $context.arguments, $context.source, and $context.identity maps.

      • (string) –

  • maxBatchSize (integer) – The maximum batching size for a resolver.

  • runtime (dict) –

    Describes a runtime used by an Amazon Web Services AppSync pipeline resolver or Amazon Web Services AppSync function. Specifies the name and version of the runtime to use. Note that if a runtime is specified, code must also be specified.

    • name (string) – [REQUIRED]

      The name of the runtime to use. Currently, the only allowed value is APPSYNC_JS.

    • runtimeVersion (string) – [REQUIRED]

      The version of the runtime to use. Currently, the only allowed version is 1.0.0.

  • code (string) – The resolver code that contains the request and response functions. When code is used, the runtime is required. The runtime value must be APPSYNC_JS.

  • metricsConfig (string) –

    Enables or disables enhanced resolver metrics for specified resolvers. Note that metricsConfig won’t be used unless the resolverLevelMetricsBehavior value is set to PER_RESOLVER_METRICS. If the resolverLevelMetricsBehavior is set to FULL_REQUEST_RESOLVER_METRICS instead, metricsConfig will be ignored. However, you can still set its value.

    metricsConfig can be ENABLED or DISABLED.

Return type:

dict

Returns:

Response Syntax

{
    'resolver': {
        'typeName': 'string',
        'fieldName': 'string',
        'dataSourceName': 'string',
        'resolverArn': 'string',
        'requestMappingTemplate': 'string',
        'responseMappingTemplate': 'string',
        'kind': 'UNIT'|'PIPELINE',
        'pipelineConfig': {
            'functions': [
                'string',
            ]
        },
        'syncConfig': {
            'conflictHandler': 'OPTIMISTIC_CONCURRENCY'|'LAMBDA'|'AUTOMERGE'|'NONE',
            'conflictDetection': 'VERSION'|'NONE',
            'lambdaConflictHandlerConfig': {
                'lambdaConflictHandlerArn': 'string'
            }
        },
        'cachingConfig': {
            'ttl': 123,
            'cachingKeys': [
                'string',
            ]
        },
        'maxBatchSize': 123,
        'runtime': {
            'name': 'APPSYNC_JS',
            'runtimeVersion': 'string'
        },
        'code': 'string',
        'metricsConfig': 'ENABLED'|'DISABLED'
    }
}

Response Structure

  • (dict) –

    • resolver (dict) –

      The Resolver object.

      • typeName (string) –

        The resolver type name.

      • fieldName (string) –

        The resolver field name.

      • dataSourceName (string) –

        The resolver data source name.

      • resolverArn (string) –

        The resolver Amazon Resource Name (ARN).

      • requestMappingTemplate (string) –

        The request mapping template.

      • responseMappingTemplate (string) –

        The response mapping template.

      • kind (string) –

        The resolver type.

        • UNIT: A UNIT resolver type. A UNIT resolver is the default resolver type. You can use a UNIT resolver to run a GraphQL query against a single data source.

        • PIPELINE: A PIPELINE resolver type. You can use a PIPELINE resolver to invoke a series of Function objects in a serial manner. You can use a pipeline resolver to run a GraphQL query against multiple data sources.

      • pipelineConfig (dict) –

        The PipelineConfig.

        • functions (list) –

          A list of Function objects.

          • (string) –

      • syncConfig (dict) –

        The SyncConfig for a resolver attached to a versioned data source.

        • conflictHandler (string) –

          The Conflict Resolution strategy to perform in the event of a conflict.

          • OPTIMISTIC_CONCURRENCY: Resolve conflicts by rejecting mutations when versions don’t match the latest version at the server.

          • AUTOMERGE: Resolve conflicts with the Automerge conflict resolution strategy.

          • LAMBDA: Resolve conflicts with an Lambda function supplied in the LambdaConflictHandlerConfig.

        • conflictDetection (string) –

          The Conflict Detection strategy to use.

          • VERSION: Detect conflicts based on object versions for this resolver.

          • NONE: Do not detect conflicts when invoking this resolver.

        • lambdaConflictHandlerConfig (dict) –

          The LambdaConflictHandlerConfig when configuring LAMBDA as the Conflict Handler.

          • lambdaConflictHandlerArn (string) –

            The Amazon Resource Name (ARN) for the Lambda function to use as the Conflict Handler.

      • cachingConfig (dict) –

        The caching configuration for the resolver.

        • ttl (integer) –

          The TTL in seconds for a resolver that has caching activated.

          Valid values are 1–3,600 seconds.

        • cachingKeys (list) –

          The caching keys for a resolver that has caching activated.

          Valid values are entries from the $context.arguments, $context.source, and $context.identity maps.

          • (string) –

      • maxBatchSize (integer) –

        The maximum batching size for a resolver.

      • runtime (dict) –

        Describes a runtime used by an Amazon Web Services AppSync pipeline resolver or Amazon Web Services AppSync function. Specifies the name and version of the runtime to use. Note that if a runtime is specified, code must also be specified.

        • name (string) –

          The name of the runtime to use. Currently, the only allowed value is APPSYNC_JS.

        • runtimeVersion (string) –

          The version of the runtime to use. Currently, the only allowed version is 1.0.0.

      • code (string) –

        The resolver code that contains the request and response functions. When code is used, the runtime is required. The runtime value must be APPSYNC_JS.

      • metricsConfig (string) –

        Enables or disables enhanced resolver metrics for specified resolvers. Note that metricsConfig won’t be used unless the resolverLevelMetricsBehavior value is set to PER_RESOLVER_METRICS. If the resolverLevelMetricsBehavior is set to FULL_REQUEST_RESOLVER_METRICS instead, metricsConfig will be ignored. However, you can still set its value.

        metricsConfig can be ENABLED or DISABLED.

Exceptions

  • AppSync.Client.exceptions.ConcurrentModificationException

  • AppSync.Client.exceptions.NotFoundException

  • AppSync.Client.exceptions.UnauthorizedException

  • AppSync.Client.exceptions.InternalFailureException

  • AppSync.Client.exceptions.BadRequestException