[configgrpc, confighttp] Support lists of name/value pairs for headers #13996
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## main #13996 +/- ##
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- Coverage 91.67% 91.64% -0.03%
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Files 654 655 +1
Lines 42663 42669 +6
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- Hits 39111 39105 -6
- Misses 2738 2749 +11
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codeboten
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Oct 15, 2025
songy23
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Oct 15, 2025
#### Description #43509 changed the `make for-all` Makefile target to access the `ALL_MODS` variable through environment variables instead of expanding it into the shell command, in order to bypass Windows' 8192 byte command line length limit. However, the environment variable was not defined, which led to `make for-all` becoming a no-op. This can be confirmed by running `make for-all CMD='echo test'`. (I discovered this issue because [this PR](open-telemetry/opentelemetry-collector#13996) in core repository, which should be failing `contrib-tests`, suddenly started passing them. This was because the job inserts `replace` statements in a copy of contrib using `for-all`; failing to do that caused the contrib tests to run against whatever version of core is imported here rather than against the PR's code.) This PR fixes that oversight, by adding the `export` keyword to the `ALL_MODS` variable.
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Description
This PR introduces:
MapList[T]type, which is equivalent to[]{ Name string, Value T }, but can be unmarshalled from amap[string]Tas well. This type is defined in a newinternal/maplistpackage.configopaque.MapListconfiggrpcandconfighttpare changed to use this type instead ofmap[string]configopaque.Stringfor storing header configuration, so as to be consistent with the SDK declarative config (see tracking issue).Note that while this is relatively elegant, it causes a number of breaking changes. An alternative would be to keep the current
map[string]configopaque.Stringtypes, and add an Unmarshal method on the surrounding struct: see this PoC.Link to tracking issue
Fixes #13930
Testing
I added a basic unit test in
internal/maplist.