move cpus validation to validation.py

Signed-off-by: Alexey Rokhin <arokhin@mail.ru>

compose/config/config.py

@@ -38,6 +38,7 @@ from .types import VolumeSpec
 from .validation import match_named_volumes
 from .validation import validate_against_config_schema
 from .validation import validate_config_section
+from .validation import validate_cpu
 from .validation import validate_depends_on
 from .validation import validate_extends_file_path
 from .validation import validate_links
@@ -643,6 +644,7 @@ def validate_service(service_config, service_names, config_file):
     validate_service_constraints(service_dict, service_name, config_file)
     validate_paths(service_dict)
 
+    validate_cpu(service_config)
     validate_ulimits(service_config)
     validate_network_mode(service_config, service_names)
     validate_depends_on(service_config, service_names)

compose/config/validation.py

@@ -15,6 +15,7 @@ from jsonschema import RefResolver
 from jsonschema import ValidationError
 
 from ..const import COMPOSEFILE_V1 as V1
+from ..const import NANOCPUS_SCALE
 from .errors import ConfigurationError
 from .errors import VERSION_EXPLANATION
 from .sort_services import get_service_name_from_network_mode
@@ -387,6 +388,16 @@ def validate_service_constraints(config, service_name, config_file):
     handle_errors(validator.iter_errors(config), handler, None)
 
 
+def validate_cpu(service_config):
+    cpus = service_config.config.get('cpus')
+    if not cpus:
+        return
+    nano_cpus = cpus * NANOCPUS_SCALE
+    if isinstance(nano_cpus, float) and not nano_cpus.is_integer():
+        raise ConfigurationError(
+            "cpus must have nine or less digits after decimal point")
+
+
 def get_schema_path():
     return os.path.dirname(os.path.abspath(__file__))
 

compose/const.py

@@ -15,6 +15,7 @@ LABEL_NETWORK = 'com.docker.compose.network'
 LABEL_VERSION = 'com.docker.compose.version'
 LABEL_VOLUME = 'com.docker.compose.volume'
 LABEL_CONFIG_HASH = 'com.docker.compose.config-hash'
+NANOCPUS_SCALE = 1000000000
 
 SECRETS_PATH = '/run/secrets'
 

compose/service.py

@@ -34,6 +34,7 @@ from .const import LABEL_ONE_OFF
 from .const import LABEL_PROJECT
 from .const import LABEL_SERVICE
 from .const import LABEL_VERSION
+from .const import NANOCPUS_SCALE
 from .container import Container
 from .errors import HealthCheckFailed
 from .errors import NoHealthCheckConfigured
@@ -803,10 +804,7 @@ class Service(object):
 
         nano_cpus = None
         if 'cpus' in options:
-            nano_cpus = options.get('cpus') * 1000000000
-            if isinstance(nano_cpus, float) and not nano_cpus.is_integer():
-                raise ValueError("cpus is too precise")
-            nano_cpus = int(nano_cpus)
+            nano_cpus = int(options.get('cpus') * NANOCPUS_SCALE)
 
         return self.client.create_host_config(
             links=self._get_links(link_to_self=one_off),