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import copy
import logging
from botocore.exceptions import EndpointProviderError
from botocore.regions import EndpointRulesetResolver
LOG = logging.getLogger(__name__)
class AioEndpointRulesetResolver(EndpointRulesetResolver):
async def construct_endpoint(
self,
operation_model,
call_args,
request_context,
):
"""Invokes the provider with params defined in the service's ruleset"""
if call_args is None:
call_args = {}
if request_context is None:
request_context = {}
provider_params = await self._get_provider_params(
operation_model, call_args, request_context
)
LOG.debug(
'Calling endpoint provider with parameters: %s' % provider_params
)
try:
provider_result = self._provider.resolve_endpoint(
**provider_params
)
except EndpointProviderError as ex:
botocore_exception = self.ruleset_error_to_botocore_exception(
ex, provider_params
)
if botocore_exception is None:
raise
else:
raise botocore_exception from ex
LOG.debug('Endpoint provider result: %s' % provider_result.url)
# The endpoint provider does not support non-secure transport.
if not self._use_ssl and provider_result.url.startswith('https://'):
provider_result = provider_result._replace(
url=f'http://{provider_result.url[8:]}'
)
# Multi-valued headers are not supported in botocore. Replace the list
# of values returned for each header with just its first entry,
# dropping any additionally entries.
provider_result = provider_result._replace(
headers={
key: val[0] for key, val in provider_result.headers.items()
}
)
return provider_result
async def _get_provider_params(
self, operation_model, call_args, request_context
):
"""Resolve a value for each parameter defined in the service's ruleset
The resolution order for parameter values is:
1. Operation-specific static context values from the service definition
2. Operation-specific dynamic context values from API parameters
3. Client-specific context parameters
4. Built-in values such as region, FIPS usage, ...
"""
provider_params = {}
# Builtin values can be customized for each operation by hooks
# subscribing to the ``before-endpoint-resolution.*`` event.
customized_builtins = await self._get_customized_builtins(
operation_model, call_args, request_context
)
for param_name, param_def in self._param_definitions.items():
param_val = self._resolve_param_from_context(
param_name=param_name,
operation_model=operation_model,
call_args=call_args,
)
if param_val is None and param_def.builtin is not None:
param_val = self._resolve_param_as_builtin(
builtin_name=param_def.builtin,
builtins=customized_builtins,
)
if param_val is not None:
provider_params[param_name] = param_val
return provider_params
async def _get_customized_builtins(
self, operation_model, call_args, request_context
):
service_id = self._service_model.service_id.hyphenize()
customized_builtins = copy.copy(self._builtins)
# Handlers are expected to modify the builtins dict in place.
await self._event_emitter.emit(
'before-endpoint-resolution.%s' % service_id,
builtins=customized_builtins,
model=operation_model,
params=call_args,
context=request_context,
)
return customized_builtins
|
