I have an ADO.NET
Data Service that's supposed to provide read-only access to a somewhat complex database.
Logically I have table-per-type (TPT) inheritance in my
data model but the EDM doesn't implement inheritance. (Limitation of EF and navigation properties on derived types. STILL not fixed in EF4!) I can query my EDM directly (using a separate project) using a copy of the query I'm trying to run against the web service, results are returned within 10 seconds. Disabling the query interceptors I'm able to make the same query against the web service, results are returned similarly quickly. I can enable some of the query interceptors and the results are returned slowly, up to a minute or so later. Alternatively, I can enable all the query interceptors, expand less of the properties on the main object I'm querying, and results are returned in a similar period of time. (I've increased some of the timeout periods)
Up til this point Sql Profiler indicates the slow-down is the database. (That's a post for a different day) But when I enable all my query interceptors and expand all the properties I'd like to have the IIS worker process pegs the CPU for 20 minutes and a query is never even made against the database. This implies to me that yes, my implementation probably sucks but regardless the
Data Services "tier" is having an issue it shouldn't. WCF tracing didn't reveal anything interesting to my untrained eye.
Details:
Data model: Agent-Person-Student
Student has a collection of referrals
Students and referrals are private, queries against the web service should only return "your" students and referrals. This means Person and Agent need to be filtered too. Other entities (Agent-Organization-School) can be accessed by anyone who has authenticated.
The existing security model is poorly suited to perform this
type of filtering for this
type of
data access, the query interceptors are complicated and cause EF to generate some entertaining sql queries.
Sample Interceptor
[QueryInterceptor("Agents")]
public Expression<Func<Agent, Boolean>> OnQueryAgents()
{
//Agent is a Person(1), Educator(2), Student(3), or Other Person(13); allow if scope permissions exist
return ag =>
(ag.AgentType.AgentTypeId == 1 || ag.AgentType.AgentTypeId == 2 || ag.AgentType.AgentTypeId == 3 || ag.AgentType.AgentTypeId == 13) &&
ag.Person.OrganizationPersons.Count<OrganizationPerson>(op =>
op.Organization.ScopePermissions.Any<ScopePermission>
(p => p.ApplicationRoleAccount.Account.UserName == HttpContext.Current.
User.Identity.Name && p.ApplicationRoleAccount.Application.ApplicationId == 124) ||
op.Organization.HierarchyDescendents.Any<OrganizationsHierarchy>(oh => oh.AncestorOrganization.ScopePermissions.Any<ScopePermission>
(p => p.ApplicationRoleAccount.Account.UserName == HttpContext.Current.
User.Identity.Name && p.ApplicationRoleAccount.Application.ApplicationId == 124))) > 0;
}
The query interceptors for Person, Student, Referral are all very similar, ie they traverse multiple same/similar tables to look for ScopePermissions as above.
Sample Query
var referrals =
(from r in service.Referrals
.Expand("Organization/ParentOrganization")
.Expand("Educator/Person/Agent")
.Expand("Student/Person/Agent")
.Expand("Student")
.Expand("Grade")
.Expand("ProblemBehavior")
.Expand("Location")
.Expand("Motivation")
.Expand("AdminDecision")
.Expand("OthersInvolved")
where
r.DateCreated >= coupledays &&
r.DateDeleted == null
select r);
Any suggestions or tips would be greatly associated, for fixing my current implementation or in developing a new one, with the caveat that the database can't be changed and that ultimately I need to expose a large portion of the database via a web service that limits
data access to the
data authorized for, for the purpose of
data integration with multiple outside parties.
THANK YOU!!!
