"Generic" indigo console host

Hi,

Has anyone written a host that will read the config file at runtime and
create a service host instance for all services/endpoints in
app.config? If so, please point me to the code. If not, how would I
go about it? I see there is a ServiceModel.Configuration namespace -
could I use that?

Thanks,
Damon

Hello Damon,

It is not a big deal writing one, but then you will not be able to set base
addresses, and that will imply full addresses only in the config. In addition,
you will not be able to get to some other features like singleton instance
setting, throttling, etc.

thanks,

Juval Lowy.

> Hi,
>
> Has anyone written a host that will read the config file at runtime
> and
> create a service host instance for all services/endpoints in
> app.config? If so, please point me to the code. If not, how would I
> go about it? I see there is a ServiceModel.Configuration namespace -
> could I use that?
>
> Thanks,
> Damon

Hello Juval,

This should help you doing it. I removed some validation methods and such,
since I did it fast to post it here.
Though I plan to post a better solution on my blog. I'll post a url when
completed.

PS.
This solution uses a services.xml to read which service types to load.
On a project am working on we basically recieving all the services needed
to load from a configuration service :-)

You will still have all the app.config capabilites, since this solution still
uses the app.config.
If you want something else you can create a derived ServiceHost and override
the ApplyConfiguration method.


class HostManager
{
private static List<ServiceHost> serviceHosts; // list of loaded
sericeHosts

private static void InitServices()
{
ServiceList serviceList = GetServiceList();
Trace.WriteLine("Opening services...");
foreach (ServiceData data in serviceList.Services)
{
try
{
OpenService(data);
}
catch (Exception ex)
{
string msg = string.Format("Error Loading ServiceHost
{0}, {1}", data.AssemblyName, data.TypeName);
Trace.WriteLine(msg);
Trace.WriteLine(ex.Message);
}
}
}

private static void OpenService(ServiceData data)
{
ServiceHost host = CreateServiceHost(data) as ServiceHost;
host.SetConfiguration(data.EndPoints);
serviceHosts.Add(host);
host.Open();
}

private static ServiceList GetServiceList()
{
ServiceList list= null;
XmlFormatter formatter = new XmlFormatter();
if (File.Exists(@"services.xml"))
{
using (StreamReader sr = new StreamReader(@"services.xml"))
{
list = formatter.Deserialize<ServiceList>(sr.BaseStream);
}
}
else
{
ServiceData data = new ServiceData();
ServiceEndPointData ep = new ServiceEndPointData();
ep.Address = "http://localhost:8000/EchoService";
ep.Binding = "wsHttpBinding";
ep.Contract = "Tests.EchoService.EchoContract";
List<ServiceEndPointData> eps = new List<ServiceEndPointData>();
eps.Add(ep);
data.EndPoints = eps.ToArray();
Trace.WriteLine("Creating default xml file.");
data.AssemblyName = "Tests.EchoService";
data.TypeName = "Tests.EchoService.EchoServiceHost";
list = new ServiceList();
List<ServiceData> servicesList = new List<ServiceData>();
servicesList.Add(data);
list.Services = servicesList.ToArray();
using (System.IO.StreamWriter sw = new System.IO.StreamWriter(@"services.xml"))
{
sw.AutoFlush = true;
formatter.Serialize(sw.BaseStream, list);
}
}
return list;
}

private static ServiceHost CreateServiceHost(ServiceData data)
{
ObjectHandle handle = Activator.CreateInstance(data.AssemblyName,
data.TypeName);
ServiceHost host = handle.Unwrap() as ServiceHost;
return host;
}
}

[DataContract(Namespace=Namespaces.ServiceData)]
public class ServiceData
{
[DataMember]
public string AssemblyName;

[DataMember]
public string TypeName;

}

[DataContract(Namespace=Namespaces.ServiceListResponse)]
public class ServiceListResponse
{
[DataMember]
public ServiceData[] Services;
}



Best Regards,

Ido Samuelson
Senior consultant
Advantech (Magen MTC)
mailto:idos@magen.com

> Hello Damon,
>
> It is not a big deal writing one, but then you will not be able to set
> base addresses, and that will imply full addresses only in the config.
> In addition, you will not be able to get to some other features like
> singleton instance setting, throttling, etc.
>
> thanks,
>
> Juval Lowy.
>
>> Hi,
>>
>> Has anyone written a host that will read the config file at runtime
>> and
>> create a service host instance for all services/endpoints in
>> app.config? If so, please point me to the code. If not, how would
>> I
>> go about it? I see there is a ServiceModel.Configuration namespace -
>> could I use that?
>> Thanks,
>> Damon

In the code I post, I basically load Dynamically derived service hosts and
not services.
This could easily be changed though. Sorry for not pointed that out.

Best Regards,

Ido Samuelson
Senior consultant
Advantech (Magen MTC)
mailto:idos@magen.com

> Hello Juval,
>
> This should help you doing it. I removed some validation methods and
> such, since I did it fast to post it here. Though I plan to post a
> better solution on my blog. I'll post a url when completed.
>
> PS. This solution uses a services.xml to read which service types to
> load. On a project am working on we basically recieving all the
> services needed to load from a configuration service :-)
>
> You will still have all the app.config capabilites, since this
> solution still uses the app.config. If you want something else you can
> create a derived ServiceHost and override the ApplyConfiguration
> method.
>
> class HostManager
> {
> private static List<ServiceHost> serviceHosts; // list of
> loaded
> sericeHosts
> private static void InitServices()
> {
> ServiceList serviceList = GetServiceList();
> Trace.WriteLine("Opening services...");
> foreach (ServiceData data in serviceList.Services)
> {
> try
> {
> OpenService(data);
> }
> catch (Exception ex)
> {
> string msg = string.Format("Error Loading
> ServiceHost
> {0}, {1}", data.AssemblyName, data.TypeName);
> Trace.WriteLine(msg);
> Trace.WriteLine(ex.Message);
> }
> }
> }
> private static void OpenService(ServiceData data)
> {
> ServiceHost host = CreateServiceHost(data) as ServiceHost;
> host.SetConfiguration(data.EndPoints);
> serviceHosts.Add(host);
> host.Open();
> }
> private static ServiceList GetServiceList()
> {
> ServiceList list= null;
> XmlFormatter formatter = new XmlFormatter();
> if (File.Exists(@"services.xml"))
> {
> using (StreamReader sr = new
> StreamReader(@"services.xml"))
> {
> list =
> formatter.Deserialize<ServiceList>(sr.BaseStream);
> }
> }
> else
> {
> ServiceData data = new ServiceData();
> ServiceEndPointData ep = new ServiceEndPointData();
> ep.Address = "http://localhost:8000/EchoService";
> ep.Binding = "wsHttpBinding";
> ep.Contract = "Tests.EchoService.EchoContract";
> List<ServiceEndPointData> eps = new
> List<ServiceEndPointData>();
> eps.Add(ep);
> data.EndPoints = eps.ToArray();
> Trace.WriteLine("Creating default xml file.");
> data.AssemblyName = "Tests.EchoService";
> data.TypeName = "Tests.EchoService.EchoServiceHost";
> list = new ServiceList();
> List<ServiceData> servicesList = new
> List<ServiceData>();
> servicesList.Add(data);
> list.Services = servicesList.ToArray();
> using (System.IO.StreamWriter sw = new
> System.IO.StreamWriter(@"services.xml"))
> {
> sw.AutoFlush = true;
> formatter.Serialize(sw.BaseStream, list);
> }
> }
> return list;
> }
> private static ServiceHost CreateServiceHost(ServiceData data)
> {
> ObjectHandle handle =
> Activator.CreateInstance(data.AssemblyName,
> data.TypeName);
> ServiceHost host = handle.Unwrap() as ServiceHost;
> return host;
> }
> }
> [DataContract(Namespace=Namespaces.ServiceData)]
> public class ServiceData
> {
> [DataMember]
> public string AssemblyName;
> [DataMember]
> public string TypeName;
> }
>
> [DataContract(Namespace=Namespaces.ServiceListResponse)]
> public class ServiceListResponse
> {
> [DataMember]
> public ServiceData[] Services;
> }
> Best Regards,
>
> Ido Samuelson
> Senior consultant
> Advantech (Magen MTC)
> mailto:idos@magen.com
>> Hello Damon,
>>
>> It is not a big deal writing one, but then you will not be able to
>> set base addresses, and that will imply full addresses only in the
>> config. In addition, you will not be able to get to some other
>> features like singleton instance setting, throttling, etc.
>>
>> thanks,
>>
>> Juval Lowy.
>>
>>> Hi,
>>>
>>> Has anyone written a host that will read the config file at runtime
>>> and
>>> create a service host instance for all services/endpoints in
>>> app.config? If so, please point me to the code. If not, how would
>>> I
>>> go about it? I see there is a ServiceModel.Configuration namespace
>>> -
>>> could I use that?
>>> Thanks,
>>> Damon