docker-compose/tests/unit/config/sort_services_test.py

from __future__ import absolute_import
from __future__ import unicode_literals

import pytest

from compose.config.errors import DependencyError
from compose.config.sort_services import sort_service_dicts
from compose.config.types import VolumeFromSpec


class TestSortService(object):
    def test_sort_service_dicts_1(self):
        services = [
            {
                'links': ['redis'],
                'name': 'web'
            },
            {
                'name': 'grunt'
            },
            {
                'name': 'redis'
            }
        ]

        sorted_services = sort_service_dicts(services)
        assert len(sorted_services) == 3
        assert sorted_services[0]['name'] == 'grunt'
        assert sorted_services[1]['name'] == 'redis'
        assert sorted_services[2]['name'] == 'web'

    def test_sort_service_dicts_2(self):
        services = [
            {
                'links': ['redis', 'postgres'],
                'name': 'web'
            },
            {
                'name': 'postgres',
                'links': ['redis']
            },
            {
                'name': 'redis'
            }
        ]

        sorted_services = sort_service_dicts(services)
        assert len(sorted_services) == 3
        assert sorted_services[0]['name'] == 'redis'
        assert sorted_services[1]['name'] == 'postgres'
        assert sorted_services[2]['name'] == 'web'

    def test_sort_service_dicts_3(self):
        services = [
            {
                'name': 'child'
            },
            {
                'name': 'parent',
                'links': ['child']
            },
            {
                'links': ['parent'],
                'name': 'grandparent'
            },
        ]

        sorted_services = sort_service_dicts(services)
        assert len(sorted_services) == 3
        assert sorted_services[0]['name'] == 'child'
        assert sorted_services[1]['name'] == 'parent'
        assert sorted_services[2]['name'] == 'grandparent'

    def test_sort_service_dicts_4(self):
        services = [
            {
                'name': 'child'
            },
            {
                'name': 'parent',
                'volumes_from': [VolumeFromSpec('child', 'rw', 'service')]
            },
            {
                'links': ['parent'],
                'name': 'grandparent'
            },
        ]

        sorted_services = sort_service_dicts(services)
        assert len(sorted_services) == 3
        assert sorted_services[0]['name'] == 'child'
        assert sorted_services[1]['name'] == 'parent'
        assert sorted_services[2]['name'] == 'grandparent'

    def test_sort_service_dicts_5(self):
        services = [
            {
                'links': ['parent'],
                'name': 'grandparent'
            },
            {
                'name': 'parent',
                'network_mode': 'service:child'
            },
            {
                'name': 'child'
            }
        ]

        sorted_services = sort_service_dicts(services)
        assert len(sorted_services) == 3
        assert sorted_services[0]['name'] == 'child'
        assert sorted_services[1]['name'] == 'parent'
        assert sorted_services[2]['name'] == 'grandparent'

    def test_sort_service_dicts_6(self):
        services = [
            {
                'links': ['parent'],
                'name': 'grandparent'
            },
            {
                'name': 'parent',
                'volumes_from': [VolumeFromSpec('child', 'ro', 'service')]
            },
            {
                'name': 'child'
            }
        ]

        sorted_services = sort_service_dicts(services)
        assert len(sorted_services) == 3
        assert sorted_services[0]['name'] == 'child'
        assert sorted_services[1]['name'] == 'parent'
        assert sorted_services[2]['name'] == 'grandparent'

    def test_sort_service_dicts_7(self):
        services = [
            {
                'network_mode': 'service:three',
                'name': 'four'
            },
            {
                'links': ['two'],
                'name': 'three'
            },
            {
                'name': 'two',
                'volumes_from': [VolumeFromSpec('one', 'rw', 'service')]
            },
            {
                'name': 'one'
            }
        ]

        sorted_services = sort_service_dicts(services)
        assert len(sorted_services) == 4
        assert sorted_services[0]['name'] == 'one'
        assert sorted_services[1]['name'] == 'two'
        assert sorted_services[2]['name'] == 'three'
        assert sorted_services[3]['name'] == 'four'

    def test_sort_service_dicts_circular_imports(self):
        services = [
            {
                'links': ['redis'],
                'name': 'web'
            },
            {
                'name': 'redis',
                'links': ['web']
            },
        ]

        with pytest.raises(DependencyError) as exc:
            sort_service_dicts(services)
        assert 'redis' in exc.exconly()
        assert 'web' in exc.exconly()

    def test_sort_service_dicts_circular_imports_2(self):
        services = [
            {
                'links': ['postgres', 'redis'],
                'name': 'web'
            },
            {
                'name': 'redis',
                'links': ['web']
            },
            {
                'name': 'postgres'
            }
        ]

        with pytest.raises(DependencyError) as exc:
            sort_service_dicts(services)
        assert 'redis' in exc.exconly()
        assert 'web' in exc.exconly()

    def test_sort_service_dicts_circular_imports_3(self):
        services = [
            {
                'links': ['b'],
                'name': 'a'
            },
            {
                'name': 'b',
                'links': ['c']
            },
            {
                'name': 'c',
                'links': ['a']
            }
        ]

        with pytest.raises(DependencyError) as exc:
            sort_service_dicts(services)
        assert 'a' in exc.exconly()
        assert 'b' in exc.exconly()

    def test_sort_service_dicts_self_imports(self):
        services = [
            {
                'links': ['web'],
                'name': 'web'
            },
        ]

        with pytest.raises(DependencyError) as exc:
            sort_service_dicts(services)
        assert 'web' in exc.exconly()

    def test_sort_service_dicts_depends_on_self(self):
        services = [
            {
                'depends_on': ['web'],
                'name': 'web'
            },
        ]

        with pytest.raises(DependencyError) as exc:
            sort_service_dicts(services)
        assert 'A service can not depend on itself: web' in exc.exconly()