Hi,
I had a problem in my app that would only show when using the live
data and I could not load all the live data into the local datastore.
So I wrote an ApiProxy.Delegate which intercepts all datastore RPC
calls on the dev server and posts the binary data to a servlet running
in my live app that calls ApiProxy.makeSyncCall and returns the binary
result back to the dev server.
I thought that this approach might also be an easy way to manipulate
data in a production datastore directly from code on your local
machine. i.e. you could even write a TestCase that loads data or
sends emails... many cool uses.
It *almost* works... the only part that is not working so far are
calls to "Next" which are made by result Iterators when they need a
new chuck of data. This runs fine in dev mode (connecting from one
dev server to another) but on the live servers throws:
com.google.apphosting.api.ApiProxy$ApplicationException:
ApplicationError: 1: invalid handle: 18336955636086461310
at com.google.apphosting.runtime.ApiProxyImpl
$AsyncApiFuture.rpcFinished(ApiProxyImpl.java:293)
at com.google.net.rpc.RpcStub$RpcCallbackDispatcher
$1.runInContext(RpcStub.java:1025)
at com.google.tracing.TraceContext$TraceContextRunnable
$1.run(TraceContext.java:444)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:684)
at com.google.tracing.TraceContext
$
AbstractTraceContextCallback
.runInInheritedContextNoUnref(TraceContext.java:322)
at com.google.tracing.TraceContext
$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:
314)
at com.google.tracing.TraceContext
$TraceContextRunnable.run(TraceContext.java:442)
at com.google.net.rpc.RpcStub
$RpcCallbackDispatcher.rpcFinished(RpcStub.java:1046)
at com.google.net.rpc.RPC.internalFinish(RPC.java:2047)
at com.google.net.rpc.impl.RpcNetChannel.finishRpc(RpcNetChannel.java:
2338)
at
com
.google.net.rpc.impl.RpcNetChannel.messageReceived(RpcNetChannel.java:
1265)
at
com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:
319)
at
com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:
290)
This code is closed source and server side only so I was wondering if
someone might be able to shed some light on the problem or suggest a
workaround? My first thought was that perhaps the protocol buffers
are different on the live servers to the dev servers.
I put the code up here: http://code.google.com/p/remote-datastore/
Thanks,
John
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