terraform: share graph walker's variables lock w/ interpolater #5772
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The ContextGraphWalker struct includes a lock that's passed down to BuiltinEvalContext and guards access to interpolation variables as they're written using SetVariables. The likely problem being expressed in #5733 is that the same map reference is also passed down to the Interpolater.Variables field, which is used for variable lookup. Here, we plumb the same lock we're using to guard access for writes down and acquire it before doing variable reads as well. It's not as fine grained as perhaps it could be, but all the context tests pass and I believe this should address #5733.
| @@ -273,6 +274,8 @@ func (i *Interpolater) valueUserVar( | |||
| n string, | |||
| v *config.UserVariable, | |||
| result map[string]ast.Variable) error { | |||
| i.VariablesLock.Lock() | |||
| defer i.VariablesLock.Unlock() | |||
There was a problem hiding this comment.
You probably don't need to defer here, just unlock right below the next line.
|
One comment, then go for merge. |
phinze
force-pushed
the
phinze/var-concurrent-map-race
branch
from
db06574
to
024dcc9
Compare
|
There's a |
|
Oh I missed it. Sounds good. |
phinze
added a commit
that referenced
this pull request
Mar 21, 2016
terraform: share graph walker's variables lock w/ interpolater
|
I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further. |
ghost
locked and limited conversation to collaborators
Sign up for free
to subscribe to this conversation on GitHub.
Already have an account?
Sign in.
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The ContextGraphWalker struct includes a lock that's passed down to
BuiltinEvalContext and guards access to interpolation variables as
they're written using SetVariables.
The likely problem being expressed in #5733 is that the same map
reference is also passed down to the Interpolater.Variables field, which
is used for variable lookup.
Here, we plumb the same lock we're using to guard access for writes down
and acquire it before doing variable reads as well. It's not as fine
grained as perhaps it could be, but all the context tests pass and I
believe this should address #5733.