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Using Multiple Gateways
123
called "ServiceFailure". All elements will be qualified in the OSE namespace. Inadequate prior
art has been found as to the most appropriate way to make use of the detail element, so it may be nec-
essary to change this in the future if necessary.
Using Multiple Gateways
Because it is possible to attach multiple HTTP server objects to a particular instance of a HTTP dae-
mon object, you aren’t restricted to having only one instance of an RPC gateway. The first conse-
quence of this fact is that for which ever protocol you intend to use, multiple RPC gateways can be
created which map to distinct parts of the URL namespace.
Such RPC gateways can and would generally be associated with different groups of services. It is pos-
sible that some of the RPC gateways might be protected using user authentication. At the same time,
a HTTP file server object or custom HTTP server object might also be attached to the same HTTP dae-
mon.
files = netsvc.FileServer(os.getcwd())
httpd.attach("/download",files)
user = netsvc.RpcGateway("web-services")
httpd.attach("/service",user)
admin = netsvc.RpcGateway("admin-services")
httpd.attach("/admin",admin)
When creating RPC gateways, you also aren’t restricted to them all being for the same protocol. As
long as they are hosted under different parts of the URL namespace, gateways for all three of the RPC
over HTTP protocols currently supported could be provided against the same set of services. In doing
this, as long as your service fits within the lowest common denominator with respect to the limitations
of the XML-RPC and SOAP protocols, you could leave it up to the user as to which protocol they want
to use.
netrpcgw = netsvc.RpcGateway("web-services")
httpd.attach("/netrpc",netrpcgw)
xmlrpcgw = netsvc.xmlrpc.RpcGateway("web-services")
httpd.attach("/xmlrpc",xmlrpcgw)
soapgw = netsvc.soap.RpcGateway("web-services")
httpd.attach("/soap",soapgw)
Using the various features of the HTTP servlet framework, a diverse set of interfaces could be present-
ed through the same HTTP daemon. In general though, it is recommended that a full blown HTTP serv-
er such as Apache still be used for performing as much of the web serving capabilities as possible.
A suitable model may be to use PHP or PSP on your main web server and have it make requests into
the back end application using one of the RPC over HTTP protocols as necessary. This has the benefit
- Dumpleton 1
- Software 1
- Consulting 1
- Pty Limited 1
- Table of Contents 3
- Manual Overview 7
- Python Modules 9
- Module Descriptions 10
- Installation and Setup 10
- Specifying a Log File 14
- Exceptions in a Callback 17
- Logging Facility 18
- Configuration File 20
- Naming Hierarchies 21
- Environment Variables 21
- Unique Identifiers 22
- Process Identity 23
- Program Setup 24
- Event Framework 26
- Real Time Events 28
- Destroying Agents 29
- Alarms and Timers 29
- Recurring Actions 30
- Socket Events 31
- Program Signals 32
- Program Shutdown 33
- Service Naming 38
- Service Audience 39
- Anonymous Service 39
- Service Registry 41
- Service Announcements 43
- Group Announcements 44
- Service Lookup 44
- Service Reports 47
- Publishing Reports 48
- Monitoring Reports 48
- Lifetime of Reports 50
- Identity of Subscribers 53
- Existence of Publishers 55
- Service Requests 57
- Detecting a Failure 61
- Servicing a Request 64
- Generating a Failure 65
- Delaying a Response 66
- Invalid Request Method 69
- Local Service Requests 69
- Exchange Initialisation 72
- Service Availability 72
- Authorisation of Clients 75
- Distributed Exchange Server 75
- Multiple Exchange Groups 76
- Message Encoding 79
- Mapping of Scalar Types 81
- The HTTP Daemon 88
- The File Server 89
- Client Authorisation 90
- User Authorisation 91
- HTTP Server Objects 91
- The Error Servlet 92
- The Redirect Servlet 93
- The Echo Servlet 93
- The File Servlet 93
- Logging of Requests 94
- Persistent Connections 96
- Destruction of Servlets 98
- Processing Content 99
- The Form Servlet 100
- Slow HTTP Clients 101
- Servlet Objects 102
- Servlet Plugins 106
- Writing a Plugin 108
- Plugin Aliasing 108
- The RPC Gateway 112
- The Client Application 113
- Restricting Client Access 113
- Duplicate Services 114
- User Defined Types 115
- Managing User Sessions 116
- The XML-RPC Gateway 119
- Remote Access 120
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