Sanitize names that must follow DNS naming rules

[jpkrohling]

Closes #466 by making the sanitizing names for services and volumes, to be DNS-compliant. Apart from this change, a name such as jaegerqe.test is now possible and yields no errors.

The bigger topic of "validation" in general isn't being touched by this PR.

cc @jkandasa

Signed-off-by: Juraci Paixão Kröhling juraci@kroehling.de

[codecov]

Codecov Report

Merging #483 into master will decrease coverage by 0.01%.
The diff coverage is 92.59%.

@@            Coverage Diff             @@
##           master     #483      +/-   ##
==========================================
- Coverage    91.7%   91.68%   -0.02%     
==========================================
  Files          64       65       +1     
  Lines        3181     3200      +19     
==========================================
+ Hits         2917     2934      +17     
- Misses        184      185       +1     
- Partials       80       81       +1

Impacted Files	Coverage Δ
pkg/config/ui/ui.go	96.96% <100%> (+0.09%)	⬆️
pkg/service/collector.go	100% <100%> (ø)	⬆️
pkg/service/agent.go	100% <100%> (ø)	⬆️
pkg/config/sampling/sampling.go	97.01% <100%> (+0.09%)	⬆️
pkg/service/query.go	100% <100%> (ø)	⬆️
pkg/util/dns_name.go	86.66% <86.66%> (ø)

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[codecov]

Codecov Report

Merging #483 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #483      +/-   ##
==========================================
+ Coverage    91.7%   91.74%   +0.04%     
==========================================
  Files          64       65       +1     
  Lines        3181     3199      +18     
==========================================
+ Hits         2917     2935      +18     
  Misses        184      184              
  Partials       80       80

Impacted Files	Coverage Δ
pkg/config/ui/ui.go	96.96% <100%> (+0.09%)	⬆️
pkg/service/collector.go	100% <100%> (ø)	⬆️
pkg/service/agent.go	100% <100%> (ø)	⬆️
pkg/config/sampling/sampling.go	97.01% <100%> (+0.09%)	⬆️
pkg/service/query.go	100% <100%> (ø)	⬆️
pkg/util/dns_name.go	100% <100%> (ø)

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[jkandasa]

@jpkrohling We should document this approach on a notable area. Otherwise, the end user will be waiting for a given name, but Jaeger-operator creates a different name (if the name contains invalid chars).

[jpkrohling]

+1 , but note that we only change service names and volume names, both are what I'd consider implementation details.

[jpkrohling]

By the way: our readme is already somewhat crowded. I'm actually not sure this belongs to the main documentation.

@JStickler, any ideas?

[objectiser]

Lgtm subject to thd suggested changes.

[JStickler]

@jpkrohling Yes, the operator README is really long (14 pages if I was going to print it). But it's not part of this PR, and I'm not sure what you were getting at in your question to me? Could you clarify what you wanted my opinion on?

[jpkrohling]

@JStickler sorry, I kinda forgot to add the context :-) The change from this PR introduces a change that needs to be documented: if the Jaeger CustomResource contains chars not compatible with the specification for DNS names, the invalid chars are replaced by "-" on object names that need to follow this rule (such as "services" and "volumes").

IMO, this is too specific to be useful in the readme, but I can imagine that users might be confused when they create a Jaeger instance named jaeger.testqe and their service names are all like jaeger-testqe.

[jpkrohling]

I'm merging, but will work on the documentation based on what @JStickler suggests.