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If you remember back in the DRb Over SSL section of 1, we saw that we had to tell the service to use the drbssl protocol Well, the same here is true That is why we had to pass in the host and port we wanted to bind to Unfortunately, there is no way to just specify that we want to use the drbssl protocol without also having to bind our service to a specific host and port This means that if we are to fire up two instances of our Hello World service, we must make sure that they are not stepping on each other s toes If we were to run this example, we would see that our client would output something along these lines:
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Hello, world! [:hello_world_service, #<DRb::DRbObject:0x33fa68 @ref=1712560, @uri="drbssl://127001:61677">]
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So we can see that although we had to hardcode our server to a specific host and port, our client found that information dynamically by querying the RingServer
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Selecting a RingServer
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Whenever we have discussed security, all we have really talked about is malicious clients trying to either attack our services or send dangerous or bogus messages to our servers But what about the security of our clients A hacker could just as easily set up a server that pretends to be a valid server and intercept requests from our clients Certainly using things like SSL can help prevent this type of interception, because requests are terminated if either side of the relationship does not present the right credentials The other option we have is to be more selective in choosing our RingServer
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If you are working in a development or testing environment that has more than one person working on Rindabased applications, it is easy to accidentally select someone else s RingServer instead of your own This can lead to chaos and confusion as you start overwriting someone else s Tuples, or they yours Using either a firewall or the techniques discussed in this section will make your development experience less painful
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So far in all our examples we have somewhat magically been locating the RingServer we were hoping to find We have been calling the following code:
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ring_server = Rinda::RingFingerprimary
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How has this code been finding our RingServer Great question Before we answer it, let s look at how we have been starting our RingServer so far:
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Rinda::RingServernew(Rinda::TupleSpacenew)
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When we start our RingServer in this fashion, we are telling Rinda to start a RingServer and bind it to port 7647 When we call the primary method on Rinda::RingFinger, it first looks to see if somewhere on the local network a RingServer is broadcasting on port 7647 The first RingServer it finds broadcasting on that port is returned If no RingServer is found broadcasting on the network, it then looks at the localhost of the requestor to see if a RingServer is broadcasting there Again, if it is found, it is returned; otherwise, an exception is raised This process is shown in Figure 2-4
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Do you have a RingServer on port: 7647 Network Yes, here is the RingServer or No, sorry I don t Client
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If the network has no RingServer then look locally for one
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Figure 2-4 The common flow to look up a RingServer is to query the network for a RingServer on port 7647 If one is found, it is returned; otherwise, the localhost of the requestor is queried for the RingServer
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Now that you understand how the simple case of starting and locating a RingServer works, let s fire up a RingServer on a nonstandard port:
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require 'rinda/ring' require 'rinda/tuplespace' DRbstart_service Rinda::RingServernew(Rinda::TupleSpacenew, 9000) DRbthreadjoin
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The only change we make to our normal RingServer is to pass a different port to the new method on Rinda::RingServer Now our server will start on port 9000 If we were to try and find a RingServer now using our normal method of finding one: