bad uri.scheme. don't know how to resolve.

[zhyq0520]

Please answer these questions before submitting your issue.

Should this be an issue in the gRPC issue tracker?

Create new issues for bugs and feature requests. An issue needs to be actionable. General gRPC discussions and usage questions belong to:

• grpc.io mailing list
• StackOverflow, with grpc tag

Please don't double post your questions in more locations, we are monitoring both channels and the time spent de-duplicating questions can is better spent answering more user questions.

What version of gRPC and what language are you using?

client 1.3.0 with c++
server with Golang

What operating system (Linux, Windows, …) and version?

built On Ubuntu 16.04.2 LTS
run on centos6.4 with glic-2.14

What runtime / compiler are you using (e.g. python version or version of gcc)

What did you do?

std::ostringstream oss;
oss << ip_ << ":" << port_;
log4cplus_debug("launch", "[%s:%d]", FUNCTION, LINE);
std::shared_ptrgrpc::Channel ch = grpc::CreateChannel(oss.str(), grpc::InsecureChannelCredentials());
if (!ch )
{
log4cplus_debug("launch", "[%s:%d] CreateChannel failed=%d", FUNCTION, LINE, ch->GetState(false));
return false;
}
stub_.reset(RelayStatusReport::NewStub(ch).release());
log4cplus_debug("launch", "[%s:%d] CreateChannel State=%d", FUNCTION, LINE, ch->GetState(false));
running_ = true;
log_in();

What did you expect to see?

gcc version 5.4.0 20160609
runtime glibc-2.14

What did you see instead?

Make sure you include information that can help us debug (full error message, exception listing, stack trace, logs).
export GRPC_VERBOSITY=DEBUG;./launch
log4cplus: Just opened file: /tmp/launch.log
I0601 14:26:59.340767230 22028 ev_epoll_linux.c:95] epoll engine will be using signal: 40
D0601 14:26:59.340813606 22028 ev_posix.c:107] Using polling engine: epoll
I0601 14:26:59.340852505 22028 init.c:228] grpc_init(void)
I0601 14:26:59.340866731 22028 completion_queue.c:119] grpc_completion_queue_create(reserved=(nil))
I0601 14:26:59.341009329 22028 init.c:228] grpc_init(void)
I0601 14:26:59.341035137 22028 channel_create.c:105] grpc_insecure_channel_create(target=0x2730fe0, args=0x7ffc14517160, reserved=(nil))
E0601 14:26:59.341062536 22028 uri_parser.c:60] bad uri.scheme: '10.12.23.69:55001'
E0601 14:26:59.341072024 22028 uri_parser.c:66] ^ here
E0601 14:26:59.341083069 22028 resolver_registry.c:127] don't know how to resolve '10.12.23.69:55001' or 'dns:///10.12.23.69:55001'
E0601 14:26:59.341103374 22028 uri_parser.c:60] bad uri.scheme: '10.12.23.69:55001'
E0601 14:26:59.341111859 22028 uri_parser.c:66] ^ here
E0601 14:26:59.341122141 22028 resolver_registry.c:127] don't know how to resolve '10.12.23.69:55001' or 'dns:///10.12.23.69:55001'
D0601 14:26:59.341142472 22028 combiner.c:146] C:0x2731930 create
E0601 14:26:59.341163701 22028 resolver_registry.c:127] don't know how to resolve 'dns:///10.12.23.69:55001' or 'dns:///dns:///10.12.23.69:55001'
D0601 14:26:59.341178479 22028 combiner.c:161] C:0x2731930 really_destroy old_state=1
D0601 14:26:59.341187088 22028 combiner.c:151] C:0x2731930 really_destroy
E0601 14:26:59.341209224 22028 channel.c:99] channel stack builder failed: {"created":"@1496327219.341175855","description":"resolver creation failed","file":"src/core/ext/filters/client_channel/client_channel.c","file_line":677}
I0601 14:26:59.341228385 22028 lame_client.c:181] grpc_lame_client_channel_create(target=10.12.23.69:55001, error_code=13, error_message=Failed to create client channel)
I0601 14:26:59.341238825 22028 init.c:228] grpc_init(void)
I0601 14:26:59.341248077 22028 init.c:233] grpc_shutdown(void)
I0601 14:26:59.341262231 22028 channel.c:319] grpc_channel_register_call(channel=0x27313d0, method=/relayserverstatus.RelayStatusReport/SendStatusReport, host=(null), reserved=(nil))
I0601 14:26:59.341276092 22028 channel.c:319] grpc_channel_register_call(channel=0x27313d0, method=/relayserverstatus.RelayStatusReport/Login, host=(null), reserved=(nil))
I0601 14:26:59.341288220 22028 channel.c:319] grpc_channel_register_call(channel=0x27313d0, method=/relayserverstatus.RelayStatusReport/HeartBeat, host=(null), reserved=(nil))
I0601 14:26:59.341300122 22028 channel.c:319] grpc_channel_register_call(channel=0x27313d0, method=/relayserverstatus.RelayStatusReport/GetChannelConfig, host=(null), reserved=(nil))
I0601 14:26:59.341316964 22028 channel_connectivity.c:53] grpc_channel_check_connectivity_state(channel=0x27313d0, try_to_connect=0)
E0601 14:26:59.341327284 22028 channel_connectivity.c:60] grpc_channel_check_connectivity_state called on something that is not a client channel, but 'lame-client'
I0601 14:26:59.341416705 22028 channel.c:353] grpc_channel_create_registered_call(channel=0x27313d0, parent_call=(nil), propagation_mask=ffff, completion_queue=0x2730780, registered_call_handle=0x2730fe0, deadline=gpr_timespec { tv_sec: 9223372036854775807, tv_nsec: 0, clock_type: 1 }, reserved=(nil))
I0601 14:26:59.341452235 22028 grpc_context.c:41] grpc_census_call_set_context(call=0x2732158, census_context=(nil))
I0601 14:26:59.341493404 22028 call.c:1759] grpc_call_start_batch(call=0x2732158, ops=0x7ffc14516db0, nops=3, tag=0x27316d0, reserved=(nil))
I0601 14:26:59.341506408 22028 call.c:1402] ops[0]: SEND_INITIAL_METADATA(nil)
I0601 14:26:59.341515720 22028 call.c:1402] ops[1]: SEND_MESSAGE ptr=0x2732a20
I0601 14:26:59.341523953 22028 call.c:1402] ops[2]: SEND_CLOSE_FROM_CLIENT
I0601 14:26:59.341549698 22028 lame_client.c:86] OP[lame-client:0x27327a0]: [COVERED] SEND_INITIAL_METADATA{key=3a 70 61 74 68 ':path' value=2f 72 65 6c 61 79 73 65 72 76 65 72 73 74 61 74 75 73 2e 52 65 6c 61 79 53 74 61 74 75 73 52 65 70 6f 72 74 2f 4c 6f 67 69 6e '/relayserverstatus.RelayStatusReport/Login'} SEND_MESSAGE:flags=0x00000000:len=10 SEND_TRAILING_METADATA{}
I0601 14:26:59.341580329 22028 lame_client.c:86] OP[lame-client:0x27327a0]: [UNCOVERED] CANCEL:{"created":"@1496327219.341563047","description":"lame client channel","file":"src/core/lib/surface/lame_client.c","file_line":96}
I0601 14:26:59.341594397 22028 completion_queue.c:224] grpc_cq_end_op(exec_ctx=0x7ffc14516d20, cc=0x2730780, tag=0x27316d0, error={"created":"@1496327219.341563047","description":"lame client channel","file":"src/core/lib/surface/lame_client.c","file_line":96}, done=0xa812f0, done_arg=0x2732818, storage=0x2732820)
E0601 14:26:59.341606585 22028 completion_queue.c:226] Operation failed: tag=0x27316d0, error={"created":"@1496327219.341563047","description":"lame client channel","file":"src/core/lib/surface/lame_client.c","file_line":96}
I0601 14:26:59.341622277 22028 call.c:1759] grpc_call_start_batch(call=0x2732158, ops=0x7ffc14516e80, nops=3, tag=0x2731750, reserved=(nil))
I0601 14:26:59.341633100 22028 call.c:1402] ops[0]: RECV_INITIAL_METADATA ptr=0x2731950
I0601 14:26:59.341642179 22028 call.c:1402] ops[1]: RECV_MESSAGE ptr=0x2731780
I0601 14:26:59.341652577 22028 call.c:1402] ops[2]: RECV_STATUS_ON_CLIENT metadata=0x2731998 status=0x27317a0 details=0x27317a8
I0601 14:26:59.341664201 22028 lame_client.c:86] OP[lame-client:0x27327a0]: [COVERED] RECV_INITIAL_METADATA RECV_MESSAGE RECV_TRAILING_METADATA
I0601 14:26:59.341689179 22028 lame_client.c:86] OP[lame-client:0x27327a0]: [UNCOVERED] CANCEL:{"created":"@1496327219.341674371","description":"lame client channel","file":"src/core/lib/surface/lame_client.c","file_line":96}
D0601 14:26:59.341733765 22028 call.c:690] get_final_status CLI
D0601 14:26:59.341745051 22028 call.c:693] 2: {"created":"@1496327219.341563047","description":"lame client channel","file":"src/core/lib/surface/lame_client.c","file_line":96}
D0601 14:26:59.341756089 22028 call.c:693] 3: {"created":"@1496327219.341674371","description":"lame client channel","file":"src/core/lib/surface/lame_client.c","file_line":96}
I0601 14:26:59.341768269 22028 completion_queue.c:224] grpc_cq_end_op(exec_ctx=0x7ffc14516df0, cc=0x2730780, tag=0x2731750, error="No Error", done=0xa812f0, done_arg=0x27328e8, storage=0x27328f0)
I0601 14:26:59.342055574 22050 completion_queue.c:359] grpc_completion_queue_next(cc=0x2730780, deadline=gpr_timespec { tv_sec: 1496327219, tv_nsec: 352048991, clock_type: 1 }, reserved=(nil))
I0601 14:26:59.342093860 22050 completion_queue.c:444] RETURN_EVENT[0x2730780]: OP_COMPLETE: tag:0x27316d0 ERROR
I0601 14:26:59.342112491 22050 completion_queue.c:359] grpc_completion_queue_next(cc=0x2730780, deadline=gpr_timespec { tv_sec: 1496327219, tv_nsec: 352048991, clock_type: 1 }, reserved=(nil))
I0601 14:26:59.342124762 22050 completion_queue.c:444] RETURN_EVENT[0x2730780]: OP_COMPLETE: tag:0x2731750 OK
I0601 14:26:59.342203724 22050 call.c:536] grpc_call_destroy(c=0x2732158)
D0601 14:26:59.342510292 22050 call.c:690] get_final_status CLI
D0601 14:26:59.342521574 22050 call.c:693] 2: {"created":"@1496327219.341563047","description":"lame client channel","file":"src/core/lib/surface/lame_client.c","file_line":96}
D0601 14:26:59.342531916 22050 call.c:693] 3: {"created":"@1496327219.341674371","description":"lame client channel","file":"src/core/lib/surface/lame_client.c","file_line":96}
I0601 14:26:59.342545581 22050 metadata_array.c:47] grpc_metadata_array_destroy(array=0x2731998)
I0601 14:26:59.342554262 22050 metadata_array.c:47] grpc_metadata_array_destroy(array=0x2731950)
I0601 14:26:59.342565393 22050 completion_queue.c:359] grpc_completion_queue_next(cc=0x2730780, deadline=gpr_timespec { tv_sec: 1496327219, tv_nsec: 352561968, clock_type: 1 }, reserved=(nil))
D0601 14:26:59.342578374 22050 timer_generic.c:534] TIMER CHECK BEGIN: now=102928.293732755 [1] next=102928.303720312 [11] tls_min=0 glob_min=0
D0601 14:26:59.342832224 22050 timer_generic.c:440] .. shard[0]->min_deadline = 1

Anything else we should know about your project / environment?

[dgquintas]

This is very surprising. It seems the dns resolver is not registering. You should see something like:

I0607 14:51:45.015431502   63449 ev_epoll_linux.c:95]        epoll engine will be using signal: 40
D0607 14:51:45.015559300   63449 ev_posix.c:107]             Using polling engine: epoll
D0607 14:51:45.015619338   63449 dns_resolver.c:316]         Using native dns resolver
...

Note the "Using native dns resolver" line.

Could you make sure your environment is in a good condition (no conflicting versions left around the environment, make clean, etc.)?

[zhyq0520]

@dgquintas
Hi dgquintas,
thanks for response.
this issue is gone if I link program against dynamic library.
I don't know why.

[dgquintas]

Excellent! Closing the issue.

[noonien]

If anyone is wondering, when loading a DLL/SO, an init function can be called, in case of gRPC this is grpc_init(). This function initializes gRPC, which includes registering the DNS resolvers.

When statically compiled, you have got to call grpc_init() yourself.