* Optimize (m ModuleInstance) String()
Optimize (m ModuleInstance) String() to preallocate the buffer and use strings.Builder instead of bytes.Buffer
This leads to a common case only doing a single allocation as opposed to a few allocations which the bytes.Buffer is doing.
* adding a benchmark test
Result:
```
$ go test -bench=String ./addrs -benchmem
BenchmarkStringShort-12 18271692 56.52 ns/op 16 B/op 1 allocs/op
BenchmarkStringLong-12 8057071 158.5 ns/op 96 B/op 1 allocs/op
PASS
$ git checkout main addrs/module_instance.go
$ go test -bench=String ./addrs -benchmem
BenchmarkStringShort-12 7690818 162.0 ns/op 80 B/op 2 allocs/op
BenchmarkStringLong-12 2922117 414.1 ns/op 288 B/op 3 allocs/op
```
* Update module_instance_test.go
switch spaces to tabs
Generating strings and comparing them to implement Equal is a quick and
easy solution. Unfortunately when this code is in the hot path, it
becomes very expensive, so this commit changes some of those instances
to compare the values directly.
Combined with using addr.Equal instead of checking for string equality,
this makes Terraform dramatically faster for some operations, such as
generating large JSON plans.
If the last step in a module target is an unkeyed instance, and it's
being compared against keyed instances, we have to assume it was
intended to be used as a Module rather than a ModuleInstance.
When ModuleInstanceStep values appear alone in debug messages, it's easier
to read them in a compact, HCL-like form than as the default struct
printing style.
The configs package is aware of provider name and type (which are the
same thing today, but expected to be two different things in a future
release), and should be the source of truth for a provider config
address.
Previously we were using the experimental HCL 2 repository, but now we'll
shift over to the v2 import path within the main HCL repository as part of
actually releasing HCL 2.0 as stable.
This is a mechanical search/replace to the new import paths. It also
switches to the v2.0.0 release of HCL, which includes some new code that
Terraform didn't previously have but should not change any behavior that
matters for Terraform's purposes.
For the moment the experimental HCL2 repository is still an indirect
dependency via terraform-config-inspect, so it remains in our go.sum and
vendor directories for the moment. Because terraform-config-inspect uses
a much smaller subset of the HCL2 functionality, this does still manage
to prune the vendor directory a little. A subsequent release of
terraform-config-inspect should allow us to completely remove that old
repository in a future commit.
Our main "parse" methods in this package work with hcl.Traversals, but
we're gradually adding helpers to parse these directly froms strings since
the visual noise of doing the traversal parse first is inconvenient in
situations where addresses are coming from non-config locations where
no source information is available anyway.
This "kitchen sink" commit is mainly focused on supporting "targets" as
a new sub-category of addresses, for use-case like the -target CLI option,
but also includes some other functionality to get closer to replacing
terraform.ResourceAddress and fill out some missing parts for representing
various other address types that are currently represented as strings
in the "terraform" package.
This is for parsing the type of provider configuration address we write
into state in order to remember which provider configuration is
responsible for each resource.
We initially just mimicked our old practice of using []string for module
paths here, but the addrs package now gives us a pair of types that better
capture the two different kinds of module addresses we are dealing with:
static addresses (nodes in the configuration tree) and dynamic/instance
addresses (which can represent the situation where multiple instances are
created from a single module call).
This distinction still remains rather artificial since we don't yet have
support for count or for_each on module calls, but this is intended to lay
the foundations for that to be added later, and in the mean time just
gives us some handy helper functions for parsing and formatting these
address types.
This package is intended to contain all the functionality for parsing,
representing, and formatting addresses of objects within Terraform.
It will eventually subsume the responsibilities of both the
InterpolatedVariable and ResourceAddress types in the "terraform" package,
but for the moment is just a set of types for representing these things,
lacking any way to parse or format them. The remaining functionality
will follow in subsequent commits.
Dennis Gursky