Commit Graph

16 Commits

Author SHA1 Message Date
Martin Atkins c937c06a03 terraform: ugly huge change to weave in new HCL2-oriented types
Due to how deeply the configuration types go into Terraform Core, there
isn't a great way to switch out to HCL2 gradually. As a consequence, this
huge commit gets us from the old state to a _compilable_ new state, but
does not yet attempt to fix any tests and has a number of known missing
parts and bugs. We will continue to iterate on this in forthcoming
commits, heading back towards passing tests and making Terraform
fully-functional again.

The three main goals here are:
- Use the configuration models from the "configs" package instead of the
  older models in the "config" package, which is now deprecated and
  preserved only to help us write our migration tool.
- Do expression inspection and evaluation using the functionality of the
  new "lang" package, instead of the Interpolator type and related
  functionality in the main "terraform" package.
- Represent addresses of various objects using types in the addrs package,
  rather than hand-constructed strings. This is not critical to support
  the above, but was a big help during the implementation of these other
  points since it made it much more explicit what kind of address is
  expected in each context.

Since our new packages are built to accommodate some future planned
features that are not yet implemented (e.g. the "for_each" argument on
resources, "count"/"for_each" on modules), and since there's still a fair
amount of functionality still using old-style APIs, there is a moderate
amount of shimming here to connect new assumptions with old, hopefully in
a way that makes it easier to find and eliminate these shims later.

I apologize in advance to the person who inevitably just found this huge
commit while spelunking through the commit history.
2018-10-16 18:46:46 -07:00
Martin Atkins 5782357c28 backend: Update interface and implementations for new config loader
The new config loader requires some steps to happen in a different
order, particularly in regard to knowing the schema in order to
decode the configuration.

Here we lean directly on the configschema package, rather than
on helper/schema.Backend as before, because it's generally
sufficient for our needs here and this prepares us for the
helper/schema package later moving out into its own repository
to seed a "plugin SDK".
2018-10-16 18:39:12 -07:00
James Bardin e9a76808df create clistate.Locker interface
Simplify the use of clistate.Lock by creating a clistate.Locker
instance, which stores the context of locking a state, to allow unlock
to be called without knowledge of how the state was locked.

This alows the backend code to bring the needed UI methods to the point
where the state is locked, and still unlock the state from an outer
scope.

Provide a NoopLocker as well, so that callers can always call Unlock
without verifying the status of the lock.

Add the StateLocker field to the backend.Operation, so that the state
lock can be carried between the different function scopes of the backend
code. This will allow the backend context to lock the state before it's
read, while allowing the different operations to unlock the state when
they complete.
2018-02-23 16:48:15 -05:00
James Bardin ef8ed1e275 coalesce the backened interrupt code
Moves the nested select statements for backend operations into a single
function. The only difference in this part was that apply called
PersistState, which should be harmless regardless of the type of
operation being run.
2018-02-12 11:56:54 -05:00
James Bardin 7cba68326a always wait for a RunningOperation to return
If the user wishes to interrupt the running operation, only the first
interrupt was communicated to the operation by canceling the provided
context. A second interrupt would start the shutdown process, but not
communicate this to the running operation. This order of event could
cause partial writes of state.

What would happen is that once the command returns, the plugin system
would stop the provider processes. Once the provider processes dies, all
pending Eval operations would return return with an error, and quickly
cause the operation to complete. Since the backend code didn't know that
the process was shutting down imminently, it would continue by
attempting to write out the last known state. Under the right
conditions, the process would exit part way through the writing of the
state file.

Add Stop and Cancel CancelFuncs to the RunningOperation, to allow it to
easily differentiate between the two signals. The backend will then be
able to detect a shutdown and abort more gracefully.

In order to ensure that the backend is not in the process of writing the
state out, the command will always attempt to wait for the process to
complete after cancellation.
2018-02-12 11:56:03 -05:00
Stefan Schmidt c200c170ad Handle refresh errors. 2018-01-10 16:40:20 +01:00
James Bardin 85295e5c23 watch for cancellation in plan and refresh
Cancellation in the local backend was only implemented for apply.
2017-12-05 10:17:20 -05:00
James Bardin 305ef43aa6 provide contexts to clistate.Lock calls
Add fields required to create an appropriate context for all calls to
clistate.Lock.

Add missing checks for Meta.stateLock, where we would attempt to lock,
even if locking should be skipped.
2017-04-01 17:09:20 -04:00
James Bardin 3f0dcd1308 Have the clistate Lock use LockWithContext
- Have the ui Lock helper use state.LockWithContext.
- Rename the message package to clistate, since that's how it's imported
  everywhere.
- Use a more idiomatic placement of the Context in the LockWithContext
  args.
2017-04-01 17:09:20 -04:00
Mitchell Hashimoto 2be1f55cbb
backend/local: allow refresh on empty/non-existent state
This allows a refresh on a non-existent or empty state file. We changed
this in 0.9.0 to error which seemed reasonable but it turns out this
complicates automation that runs refresh since it now needed to
determine if the state file was empty before running.

Its easier to just revert this into a warning with exit code zero.

The reason this changed is because in 0.8.x and earlier, the output
would be simply empty with exit code zero which seemed odd.
2017-03-16 12:11:31 -07:00
Mitchell Hashimoto 9574f16f92
backend/local: refresh with no config should not crash on input
Fixes #12174

You're allowed to refresh with a nil module (no configs) as long as you
have state. However, if `-input=true` (default) then this would crash
since the input attempts to read the configs.

The API contract with `terraform.Context` says that the module tree must
be non-nil and loaded. To do this for other commands we create an empty
module tree. We do that here now.
2017-02-22 13:10:08 -08:00
James Bardin f2e496a14c Have backend operations properly unlock state
Make sure unlock is called with the correct LockID during operations
2017-02-15 14:41:55 -05:00
James Bardin 67dc16c9ca Make backend/local test pass 2017-02-15 14:41:55 -05:00
Mitchell Hashimoto 65982bd412
backend/local: use new command/state package for better UX 2017-02-14 11:17:28 -08:00
James Bardin 9cdba1f199 enable local state locking for apply
Have the LocalBackend lock the state during operations, and enble this
for the apply comand.
2017-02-02 18:08:28 -05:00
Mitchell Hashimoto 397e1b3132
backend/local
The local backend implementation is an implementation of
backend.Enhanced that recreates all the behavior of the CLI but through
the backend interface.
2017-01-26 14:33:49 -08:00