google.appengine.api.request_info.Dispatcher

Provides information about and dispatches requests to modules.

Inherits From: expected_type

Methods

add_async_request

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add_async_request(
    method,
    relative_url,
    headers,
    body,
    source_ip,
    module_name=None,
    version=None,
    instance_id=None
)

Dispatch an HTTP request asynchronously.

Args
method A str containing the HTTP method of the request.
relative_url A str containing path and query string of the request.
headers A list of (key, value) tuples where key and value are both str.
body A str containing the request body.
source_ip The source ip address for the request.
module_name An optional str containing the module name to service this request. If unset, the request will be dispatched to the default module.
version An optional str containing the version to service this request. If unset, the request will be dispatched to the default version.
instance_id An optional str containing the instance_id of the instance to service this request. If unset, the request will be dispatched to according to the load-balancing for the module and version.

add_event

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add_event(
    runnable, eta, service=None, event_id=None
)

Add a callable to be run at the specified time.

Args
runnable A callable object to call at the specified time.
eta An int containing the time to run the event, in seconds since the epoch.
service A str containing the name of the service that owns this event. This should be set if event_id is set.
event_id A str containing the id of the event. If set, this can be passed to update_event to change the time at which the event should run.

add_request

View source

add_request(
    method,
    relative_url,
    headers,
    body,
    source_ip,
    module_name=None,
    version=None,
    instance_id=None
)

Process an HTTP request.

Args
method A str containing the HTTP method of the request.
relative_url A str containing path and query string of the request.
headers A list of (key, value) tuples where key and value are both str.
body A str containing the request body.
source_ip The source ip address for the request.
module_name An optional str containing the module name to service this request. If unset, the request will be dispatched to the default module.
version An optional str containing the version to service this request. If unset, the request will be dispatched to the default version.
instance_id An optional str containing the instance_id of the instance to service this request. If unset, the request will be dispatched to according to the load-balancing for the module and version.

Returns
A ResponseTuple containing the response information for the HTTP request.

get_default_version

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get_default_version(
    module
)

Returns the default version for a module.

Args
module A str containing the name of the module.

Returns
A str containing the default version for the specified module.

Raises
ModuleDoesNotExistError The module does not exist.

get_hostname

View source

get_hostname(
    module, version, instance=None
)

Returns the hostname for a (module, version, instance) tuple.

If instance is set, this will return a hostname for that particular instances. Otherwise, it will return the hostname for load-balancing.

Args
module A str containing the name of the module.
version A str containing the version.
instance An optional str containing the instance ID.

Returns
A str containing the hostname.

Raises
ModuleDoesNotExistError The module does not exist.
VersionDoesNotExistError The version does not exist.
InvalidInstanceIdError The instance ID is not valid for the module/version or the module/version uses automatic scaling.

get_module_names

View source

get_module_names()

Returns a list of module names.

get_num_instances

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get_num_instances(
    module, version
)

Gets the number of instances running for a version of a module.

Args
module A str containing the name of the module.
version A str containing the version.

Raises
ModuleDoesNotExistError The module does not exist.
VersionDoesNotExistError The version does not exist.
NotSupportedWithAutoScalingError The provided module/version uses automatic scaling.

get_versions

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get_versions(
    module
)

Returns a list of versions for a module.

Args
module A str containing the name of the module.

Returns
A list of str containing the versions for the specified module.

Raises
ModuleDoesNotExistError The module does not exist.

send_background_request

View source

send_background_request(
    module_name, version, instance, background_request_id
)

Dispatch a background thread request.

Args
module_name A str containing the module name to service this request.
version A str containing the version to service this request.
instance The instance to service this request.
background_request_id A str containing the unique background thread request identifier.

Raises
NotSupportedWithAutoScalingError The provided module/version uses automatic scaling.
BackgroundThreadLimitReachedError The instance is at its background thread capacity.

set_num_instances

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set_num_instances(
    module, version, instances
)

Sets the number of instances to run for a version of a module.

Args
module A str containing the name of the module.
version A str containing the version.
instances An int containing the number of instances to run.

Raises
ModuleDoesNotExistError The module does not exist.
VersionDoesNotExistError The version does not exist.
NotSupportedWithAutoScalingError The provided module/version uses automatic scaling.

start_version

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start_version(
    module, version
)

Starts a version.

Args
module A str containing the name of the module.
version A str containing the version.

Raises
ModuleDoesNotExistError The module does not exist.
VersionDoesNotExistError The version does not exist.
NotSupportedWithAutoScalingError The provided module/version uses automatic scaling.

stop_version

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stop_version(
    module, version
)

Stops a version.

Args
module A str containing the name of the module.
version A str containing the version.

Raises
ModuleDoesNotExistError The module does not exist.
VersionDoesNotExistError The version does not exist.
NotSupportedWithAutoScalingError The provided module/version uses automatic scaling.

update_event

View source

update_event(
    eta, service, event_id
)

Update the eta of a scheduled event.

Args
eta An int containing the time to run the event, in seconds since the epoch.
service A str containing the name of the service that owns this event.
event_id A str containing the id of the event to update.