ValueError: dictionary update sequence element #0 has length 1; 2 is required

[pengguoyong]

$ docker run --rm -v /Users/test/git/prometheus_aci_exporter/examples/aci.yml:/etc/prometheus_aci_exporter/aci.yml -p 9377:9377 -it ravualhemio/prometheus_aci_exporter

Exception happened during processing of request from ('172.17.0.1', 57602)
Traceback (most recent call last):
File "/usr/local/lib/python3.8/socketserver.py", line 650, in process_request_thread
self.finish_request(request, client_address)
File "/usr/local/lib/python3.8/socketserver.py", line 360, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/local/lib/python3.8/socketserver.py", line 720, in init
self.handle()
File "/usr/local/lib/python3.8/http/server.py", line 427, in handle
self.handle_one_request()
File "/usr/local/lib/python3.8/http/server.py", line 415, in handle_one_request
method()
File "./prometheus_aci_exporter.py", line 513, in do_GET
generated_lines = [
File "./prometheus_aci_exporter.py", line 513, in
generated_lines = [
File "./prometheus_aci_exporter.py", line 246, in collect
yield from self.collect_fabric(fabric_name, fabric, controller, common_queries)
File "./prometheus_aci_exporter.py", line 334, in collect_fabric
labels.update(updated_labels)
ValueError: dictionary update sequence element #0 has length 1; 2 is required

[pengguoyong]

Hello experts,
The above is the error output of docker run CLI. Could you tell me what is the cause of this issue? Thanks!

[RavuAlHemio]

I have modified the code to provide a bit more context about this issue. Please try running the newest version of the container and posting the new error message here.

[pengguoyong]

@RavuAlHemio Many thanks for your reply！
I tried to run the latest version, but there are new issue the below.

Exception happened during processing of request from ('172.17.0.1', 58006)
Traceback (most recent call last):
File "./prometheus_aci_exporter.py", line 335, in collect_fabric
labels.update(updated_labels)
ValueError: dictionary update sequence element #0 has length 1; 2 is required

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.8/socketserver.py", line 650, in process_request_thread
self.finish_request(request, client_address)
File "/usr/local/lib/python3.8/socketserver.py", line 360, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/local/lib/python3.8/socketserver.py", line 720, in init
self.handle()
File "/usr/local/lib/python3.8/http/server.py", line 427, in handle
self.handle_one_request()
File "/usr/local/lib/python3.8/http/server.py", line 415, in handle_one_request
method()
File "./prometheus_aci_exporter.py", line 519, in do_GET
generated_lines = [
File "./prometheus_aci_exporter.py", line 519, in
generated_lines = [
File "./prometheus_aci_exporter.py", line 246, in collect
yield from self.collect_fabric(fabric_name, fabric, controller, common_queries)
File "./prometheus_aci_exporter.py", line 337, in collect_fabric
raise ValueError(f"failed to update labels in query {query_name!r} with {updated_labels!r}: {ex}")
ValueError: failed to update labels in query 'interface_rx_stats' with 'topology/pod-1/node-201/sys/ch/supslot-1/sup/cpuport-1/CDeqptIngrBytes5min': dictionary update sequence element #0 has length 1; 2 is required

[RavuAlHemio]

I think I've understood the issue: the regex that should extract the labels from the DN does not work with this DN format, so instead of producing a dictionary (of labels and their values), the function produces a string (the DN itself).

A quick fix in aci.yml would be adding regex_must_match: true right under the regex: [...] line under the only entry in common_queries -> interface_rx_stats -> labels (that's line 113 of the current revision of examples/aci.yml). You might also have to do the same for interface_tx_stats.