[capnproto] RPC Server Exception on using Unix Socket Domains

[r***@gmail.com]

Hi
I used following code for my sever implementation:

kj::AsyncIoContext asyncIO = kj::setupAsyncIo();
auto &waitScope = asyncIO.waitScope;
auto &ioProvider = *asyncIO.provider;
auto &network = ioProvider.getNetwork();
auto addr = network.parseAddress(instance->address).wait(waitScope);
auto listner = addr->listen();
capnp::TwoPartyServer server(kj::heap<RPCHandler>());
auto serverPromise = server.listen(*listner);


but when I pass a unix domain socket path as address, got following error:

libc++abi.dylib: terminating with uncaught exception of type kj::
ExceptionImpl: kj/async-io-unix.c++:941: failed: DNS lookup failed.; params.host
= /Users/reza/.userdata/rpc/accounts; params.service = ; gai_strerror(status
) = nodename nor servname provided, or not known
stack: 1025a8636 1025b0435 1025b00bd 102593ec2 1025944dc 102594323 102575426
1025954f4 1024c5656 1024c50c0 1024c4d47 7fff719e1660 7fff719e150c
7fff719e0bf8

could anyone help me on this?

thanks,
Reza

[David Renshaw]

Does it work if you prefix the address with "unix:", like "un
ix:/Users/reza/.userdata/rpc/accounts"?

https://github.com/capnproto/capnproto/blob/12d346b2ab99149f2779cc98fbaf2d6f0a8ea9bb/c%2B%2B/src/kj/async-io-unix.c%2B%2B#L608

Post by r***@gmail.com
Hi
kj::AsyncIoContext asyncIO = kj::setupAsyncIo();
auto &waitScope = asyncIO.waitScope;
auto &ioProvider = *asyncIO.provider;
auto &network = ioProvider.getNetwork();
auto addr = network.parseAddress(instance->address).wait(waitScope);
auto listner = addr->listen();
capnp::TwoPartyServer server(kj::heap<RPCHandler>());
auto serverPromise = server.listen(*listner);
ExceptionImpl: kj/async-io-unix.c++:941: failed: DNS lookup failed.;
params.host = /Users/reza/.userdata/rpc/accounts; params.service = ;
gai_strerror(status) = nodename nor servname provided, or not known
stack: 1025a8636 1025b0435 1025b00bd 102593ec2 1025944dc 102594323
102575426 1025954f4 1024c5656 1024c50c0 1024c4d47 7fff719e1660
7fff719e150c 7fff719e0bf8
could anyone help me on this?
thanks,
Reza
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[r***@gmail.com]

using `unix:` prefix soved the problem, thanks.

Post by David Renshaw
Does it work if you prefix the address with "unix:", like "un
ix:/Users/reza/.userdata/rpc/accounts"?
https://github.com/capnproto/capnproto/blob/12d346b2ab99149f2779cc98fbaf2d6f0a8ea9bb/c%2B%2B/src/kj/async-io-unix.c%2B%2B#L608

Post by r***@gmail.com
Hi
kj::AsyncIoContext asyncIO = kj::setupAsyncIo();
auto &waitScope = asyncIO.waitScope;
auto &ioProvider = *asyncIO.provider;
auto &network = ioProvider.getNetwork();
auto addr = network.parseAddress(instance->address).wait(waitScope);
auto listner = addr->listen();
capnp::TwoPartyServer server(kj::heap<RPCHandler>());
auto serverPromise = server.listen(*listner);
ExceptionImpl: kj/async-io-unix.c++:941: failed: DNS lookup failed.;
params.host = /Users/reza/.userdata/rpc/accounts; params.service = ;
gai_strerror(status) = nodename nor servname provided, or not known
stack: 1025a8636 1025b0435 1025b00bd 102593ec2 1025944dc 102594323
102575426 1025954f4 1024c5656 1024c50c0 1024c4d47 7fff719e1660
7fff719e150c 7fff719e0bf8
could anyone help me on this?
thanks,
Reza
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