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relation_test.go
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// Copyright 2012, 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package state_test
import (
"github.com/juju/charm"
"github.com/juju/errors"
jc "github.com/juju/testing/checkers"
gc "launchpad.net/gocheck"
"github.com/juju/juju/state"
)
type RelationSuite struct {
ConnSuite
}
var _ = gc.Suite(&RelationSuite{})
func (s *RelationSuite) TestAddRelationErrors(c *gc.C) {
wordpress := s.AddTestingService(c, "wordpress", s.AddTestingCharm(c, "wordpress"))
wordpressEP, err := wordpress.Endpoint("db")
c.Assert(err, gc.IsNil)
mysql := s.AddTestingService(c, "mysql", s.AddTestingCharm(c, "mysql"))
mysqlEP, err := mysql.Endpoint("server")
c.Assert(err, gc.IsNil)
riak := s.AddTestingService(c, "riak", s.AddTestingCharm(c, "riak"))
riakEP, err := riak.Endpoint("ring")
c.Assert(err, gc.IsNil)
// Check we can't add a relation with services that don't exist.
yoursqlEP := mysqlEP
yoursqlEP.ServiceName = "yoursql"
_, err = s.State.AddRelation(yoursqlEP, wordpressEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "wordpress:db yoursql:server": service "yoursql" does not exist`)
assertNoRelations(c, wordpress)
assertNoRelations(c, mysql)
// Check that interfaces have to match.
msep3 := mysqlEP
msep3.Interface = "roflcopter"
_, err = s.State.AddRelation(msep3, wordpressEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "wordpress:db mysql:server": endpoints do not relate`)
assertNoRelations(c, wordpress)
assertNoRelations(c, mysql)
// Check a variety of surprising endpoint combinations.
_, err = s.State.AddRelation(wordpressEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "wordpress:db": relation must have two endpoints`)
assertNoRelations(c, wordpress)
_, err = s.State.AddRelation(riakEP, wordpressEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "wordpress:db riak:ring": endpoints do not relate`)
assertOneRelation(c, riak, 0, riakEP)
assertNoRelations(c, wordpress)
_, err = s.State.AddRelation(riakEP, riakEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "riak:ring riak:ring": endpoints do not relate`)
assertOneRelation(c, riak, 0, riakEP)
_, err = s.State.AddRelation()
c.Assert(err, gc.ErrorMatches, `cannot add relation "": relation must have two endpoints`)
_, err = s.State.AddRelation(mysqlEP, wordpressEP, riakEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "wordpress:db mysql:server riak:ring": relation must have two endpoints`)
assertOneRelation(c, riak, 0, riakEP)
assertNoRelations(c, wordpress)
assertNoRelations(c, mysql)
// Check that a relation can't be added to a Dying service.
_, err = wordpress.AddUnit()
c.Assert(err, gc.IsNil)
err = wordpress.Destroy()
c.Assert(err, gc.IsNil)
_, err = s.State.AddRelation(mysqlEP, wordpressEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "wordpress:db mysql:server": service "wordpress" is not alive`)
assertNoRelations(c, wordpress)
assertNoRelations(c, mysql)
}
func (s *RelationSuite) TestRetrieveSuccess(c *gc.C) {
wordpress := s.AddTestingService(c, "wordpress", s.AddTestingCharm(c, "wordpress"))
wordpressEP, err := wordpress.Endpoint("db")
c.Assert(err, gc.IsNil)
mysql := s.AddTestingService(c, "mysql", s.AddTestingCharm(c, "mysql"))
mysqlEP, err := mysql.Endpoint("server")
c.Assert(err, gc.IsNil)
expect, err := s.State.AddRelation(wordpressEP, mysqlEP)
c.Assert(err, gc.IsNil)
rel, err := s.State.EndpointsRelation(wordpressEP, mysqlEP)
check := func() {
c.Assert(err, gc.IsNil)
c.Assert(rel.Id(), gc.Equals, expect.Id())
c.Assert(rel.String(), gc.Equals, expect.String())
}
check()
rel, err = s.State.EndpointsRelation(mysqlEP, wordpressEP)
check()
rel, err = s.State.Relation(expect.Id())
check()
}
func (s *RelationSuite) TestRetrieveNotFound(c *gc.C) {
subway := state.Endpoint{
ServiceName: "subway",
Relation: charm.Relation{
Name: "db",
Interface: "mongodb",
Role: charm.RoleRequirer,
Scope: charm.ScopeGlobal,
},
}
mongo := state.Endpoint{
ServiceName: "mongo",
Relation: charm.Relation{
Name: "server",
Interface: "mongodb",
Role: charm.RoleProvider,
Scope: charm.ScopeGlobal,
},
}
_, err := s.State.EndpointsRelation(subway, mongo)
c.Assert(err, gc.ErrorMatches, `relation "subway:db mongo:server" not found`)
c.Assert(err, jc.Satisfies, errors.IsNotFound)
_, err = s.State.Relation(999)
c.Assert(err, gc.ErrorMatches, `relation 999 not found`)
c.Assert(err, jc.Satisfies, errors.IsNotFound)
}
func (s *RelationSuite) TestAddRelation(c *gc.C) {
// Add a relation.
wordpress := s.AddTestingService(c, "wordpress", s.AddTestingCharm(c, "wordpress"))
wordpressEP, err := wordpress.Endpoint("db")
c.Assert(err, gc.IsNil)
mysql := s.AddTestingService(c, "mysql", s.AddTestingCharm(c, "mysql"))
mysqlEP, err := mysql.Endpoint("server")
c.Assert(err, gc.IsNil)
_, err = s.State.AddRelation(wordpressEP, mysqlEP)
c.Assert(err, gc.IsNil)
assertOneRelation(c, mysql, 0, mysqlEP, wordpressEP)
assertOneRelation(c, wordpress, 0, wordpressEP, mysqlEP)
// Check we cannot re-add the same relation, regardless of endpoint ordering.
_, err = s.State.AddRelation(mysqlEP, wordpressEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "wordpress:db mysql:server": relation already exists`)
_, err = s.State.AddRelation(wordpressEP, mysqlEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "wordpress:db mysql:server": relation already exists`)
assertOneRelation(c, mysql, 0, mysqlEP, wordpressEP)
assertOneRelation(c, wordpress, 0, wordpressEP, mysqlEP)
}
func (s *RelationSuite) TestAddRelationSeriesNeedNotMatch(c *gc.C) {
wordpress := s.AddTestingService(c, "wordpress", s.AddTestingCharm(c, "wordpress"))
wordpressEP, err := wordpress.Endpoint("db")
c.Assert(err, gc.IsNil)
mysql := s.AddTestingService(c, "mysql", s.AddSeriesCharm(c, "mysql", "otherseries"))
mysqlEP, err := mysql.Endpoint("server")
c.Assert(err, gc.IsNil)
_, err = s.State.AddRelation(wordpressEP, mysqlEP)
c.Assert(err, gc.IsNil)
assertOneRelation(c, mysql, 0, mysqlEP, wordpressEP)
assertOneRelation(c, wordpress, 0, wordpressEP, mysqlEP)
}
func (s *RelationSuite) TestAddContainerRelation(c *gc.C) {
// Add a relation.
wordpress := s.AddTestingService(c, "wordpress", s.AddTestingCharm(c, "wordpress"))
wordpressEP, err := wordpress.Endpoint("juju-info")
c.Assert(err, gc.IsNil)
logging := s.AddTestingService(c, "logging", s.AddTestingCharm(c, "logging"))
loggingEP, err := logging.Endpoint("info")
c.Assert(err, gc.IsNil)
_, err = s.State.AddRelation(wordpressEP, loggingEP)
c.Assert(err, gc.IsNil)
// Check that the endpoints both have container scope.
wordpressEP.Scope = charm.ScopeContainer
assertOneRelation(c, logging, 0, loggingEP, wordpressEP)
assertOneRelation(c, wordpress, 0, wordpressEP, loggingEP)
// Check we cannot re-add the same relation, regardless of endpoint ordering.
_, err = s.State.AddRelation(loggingEP, wordpressEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "logging:info wordpress:juju-info": relation already exists`)
_, err = s.State.AddRelation(wordpressEP, loggingEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "logging:info wordpress:juju-info": relation already exists`)
assertOneRelation(c, logging, 0, loggingEP, wordpressEP)
assertOneRelation(c, wordpress, 0, wordpressEP, loggingEP)
}
func (s *RelationSuite) TestAddContainerRelationSeriesMustMatch(c *gc.C) {
wordpress := s.AddTestingService(c, "wordpress", s.AddTestingCharm(c, "wordpress"))
wordpressEP, err := wordpress.Endpoint("juju-info")
c.Assert(err, gc.IsNil)
logging := s.AddTestingService(c, "logging", s.AddSeriesCharm(c, "logging", "otherseries"))
loggingEP, err := logging.Endpoint("info")
c.Assert(err, gc.IsNil)
_, err = s.State.AddRelation(wordpressEP, loggingEP)
c.Assert(err, gc.ErrorMatches, `cannot add relation "logging:info wordpress:juju-info": principal and subordinate services' series must match`)
}
func (s *RelationSuite) TestDestroyRelation(c *gc.C) {
wordpress := s.AddTestingService(c, "wordpress", s.AddTestingCharm(c, "wordpress"))
mysql := s.AddTestingService(c, "mysql", s.AddTestingCharm(c, "mysql"))
eps, err := s.State.InferEndpoints([]string{"wordpress", "mysql"})
c.Assert(err, gc.IsNil)
rel, err := s.State.AddRelation(eps...)
c.Assert(err, gc.IsNil)
// Test that the relation can be destroyed.
err = rel.Destroy()
c.Assert(err, gc.IsNil)
err = rel.Refresh()
c.Assert(err, jc.Satisfies, errors.IsNotFound)
assertNoRelations(c, wordpress)
assertNoRelations(c, mysql)
// Check that a second destroy is a no-op.
err = rel.Destroy()
c.Assert(err, gc.IsNil)
// Create a new relation and check that refreshing the old does not find
// the new.
_, err = s.State.AddRelation(eps...)
c.Assert(err, gc.IsNil)
err = rel.Refresh()
c.Assert(err, jc.Satisfies, errors.IsNotFound)
}
func (s *RelationSuite) TestDestroyPeerRelation(c *gc.C) {
// Check that a peer relation cannot be destroyed directly.
riakch := s.AddTestingCharm(c, "riak")
riak := s.AddTestingService(c, "riak", riakch)
riakEP, err := riak.Endpoint("ring")
c.Assert(err, gc.IsNil)
rel := assertOneRelation(c, riak, 0, riakEP)
err = rel.Destroy()
c.Assert(err, gc.ErrorMatches, `cannot destroy relation "riak:ring": is a peer relation`)
assertOneRelation(c, riak, 0, riakEP)
// Check that it is destroyed when the service is destroyed.
err = riak.Destroy()
c.Assert(err, gc.IsNil)
assertNoRelations(c, riak)
err = rel.Refresh()
c.Assert(err, jc.Satisfies, errors.IsNotFound)
// Create a new service (and hence a new relation in the background); check
// that refreshing the old one does not accidentally get the new one.
newriak := s.AddTestingService(c, "riak", riakch)
assertOneRelation(c, newriak, 1, riakEP)
err = rel.Refresh()
c.Assert(err, jc.Satisfies, errors.IsNotFound)
}
func assertNoRelations(c *gc.C, srv *state.Service) {
rels, err := srv.Relations()
c.Assert(err, gc.IsNil)
c.Assert(rels, gc.HasLen, 0)
}
func assertOneRelation(c *gc.C, srv *state.Service, relId int, endpoints ...state.Endpoint) *state.Relation {
rels, err := srv.Relations()
c.Assert(err, gc.IsNil)
c.Assert(rels, gc.HasLen, 1)
rel := rels[0]
c.Assert(rel.Id(), gc.Equals, relId)
c.Assert(rel.Endpoints(), jc.SameContents, endpoints)
name := srv.Name()
expectEp := endpoints[0]
ep, err := rel.Endpoint(name)
c.Assert(err, gc.IsNil)
c.Assert(ep, gc.DeepEquals, expectEp)
if len(endpoints) == 2 {
expectEp = endpoints[1]
}
eps, err := rel.RelatedEndpoints(name)
c.Assert(err, gc.IsNil)
c.Assert(eps, gc.DeepEquals, []state.Endpoint{expectEp})
return rel
}