* [sdk/go] Cache loaded configuration files
Previously, the CLI did not cache configuration files, which
required a read from disk + unmarshalling + validation each
time a consumer needed to read one of these configurations.
This change introduces global caches for each type of Pulumi
configuration file (Project, ProjectStack, PolicyPackProject, and
PluginProject). The configuration is cached after the first request
and the cached value will be used for any subsequent operations.
Important note: The global configurations are not concurrency safe,
but this same problem exists using the previous method of
reading/writing config files on disk. Synchronization
will be added in a follow up change to allow for concurrency safe config
operations.
This change avoids `RuntimeError: There is no current event loop in thread '<thread_name>'` errors when passing a resource as an input multiple times when using mocks.
The problem is that when using mocks, we deserialize the gRPC inputs before passing them to the user's mock methods. Deserializing inputs doesn't typically require an event loop, however, during deserialization of resource references, we end up creating some instances of `Future`, which does require an event loop to be present for the current thread. If this is done multiple times for a resource, it's possible that `deserialize_properties` will be called on an asyncio thread that doesn't yet have an event loop, resulting in the error being raised.
The error does not occur when only passing the resource reference once because typically the thread (e.g. `asyncio_0`) used in that case will have already had an event loop created for it due to the use of the internal `_syncawait` when _serializing_ the source resource's properties, which ensures an event loop is set for the thread.
The fix is to ensure an event loop is created for the thread in the mocks implementation before calling `deserialize_properties`.
As part of our continued effort to make our releases more useful,
we will be adding our CHANGELOG entries to the GitHub Release.
To make this process smooth, we are going to change things a little:
1. All new changelog entries when submitting a PR for an upcoming
release will now need to get added to CHANGELOG_PENDING.md
This is the source of information for what will be delivered in the
release.
2. When a release is being made, the entries from CHANGELOG_PENDING
will be copied to a new version and dated section in CHANGLOG to
mark the release
3. The GH tags will continue as normal and Goreleaser will copy
the changelog entries to the release section in GH
