terraform

Commit Graph

Author	SHA1	Message	Date
Martin Atkins	5661ab5991	configs: allow full type constraints for variables Previously we just ported over the simple "string", "list", and "map" type hint keywords from the old loader, which exist primarily as hints to the CLI for whether to treat -var=... arguments and environment variables as literal strings or as HCL expressions. However, we've been requested before to allow more specific constraints here because it's generally better UX for a type error to be detected within an expression in a calling "module" block rather than at some point deep inside a third-party module. To allow for more specific constraints, here we use the type constraint expression syntax defined as an extension within HCL, which uses the variable and function call syntaxes to represent types rather than values, like this: - string - number - bool - list(string) - list(any) - list(map(string)) - object({id=string,name=string}) In native HCL syntax this looks like: variable "foo" { type = map(string) } In JSON, this looks like: { "variable": { "foo": { "type": "map(string)" } } } The selection of literal processing or HCL parsing of CLI-set values is now explicit in the model and separate from the type, though it's still derived from the type constraint and thus not directly controllable in configuration. Since this syntax is more complex than the keywords that replaced it, for now the simpler keywords are still supported and "list" and "map" are interpreted as list(any) and map(any) respectively, mimicking how they were interpreted by Terraform 0.11 and earlier. For the time being our documentation should continue to recommend these shorthand versions until we gain more experience with the more-specific type constraints; most users should just make use of the additional primitive type constraints this enables: bool and number. As a result of these more-complete type constraints, we can now type-check the default value at config load time, which has the nice side-effect of allowing us to produce a tailored error message if an override file produces an invalid situation; previously the result was rather confusing because the error message referred to the original definition of the variable and not the overridden parts.	8 years ago
Martin Atkins	7c8efe103e	configs: allow overrides files to omit args that primary files can't Some of the fields in our config structs are either mandatory in primary files or there is a default value that we apply if absent. Unfortunately override files impose the additional constraint that we be allowed to omit required fields (which have presumably already been set in the primary files) and that we are able to distinguish between a default value and omitting a value entirely. Since most of our fields were already acceptable for override files, here we just add some new fields to deal with the few cases where special handling is required and a helper function to disable the "Required" flag on attributes in a given schema.	8 years ago
Martin Atkins	e15ec486bf	configs: Parser.LoadConfigFile This is a first pass of decoding of the main Terraform configuration file format. It hasn't yet been tested with any real-world configurations, so it will need to be revised further as we test it more thoroughly.	8 years ago

Author

SHA1

Message

Date

Martin Atkins

5661ab5991

configs: allow full type constraints for variables

Previously we just ported over the simple "string", "list", and "map" type
hint keywords from the old loader, which exist primarily as hints to the
CLI for whether to treat -var=... arguments and environment variables as
literal strings or as HCL expressions.

However, we've been requested before to allow more specific constraints
here because it's generally better UX for a type error to be detected
within an expression in a calling "module" block rather than at some point
deep inside a third-party module.

To allow for more specific constraints, here we use the type constraint
expression syntax defined as an extension within HCL, which uses the
variable and function call syntaxes to represent types rather than values,
like this:
 - string
 - number
 - bool
 - list(string)
 - list(any)
 - list(map(string))
 - object({id=string,name=string})

In native HCL syntax this looks like:

    variable "foo" {
      type = map(string)
    }

In JSON, this looks like:

    {
      "variable": {
        "foo": {
          "type": "map(string)"
        }
      }
    }

The selection of literal processing or HCL parsing of CLI-set values is
now explicit in the model and separate from the type, though it's still
derived from the type constraint and thus not directly controllable in
configuration.

Since this syntax is more complex than the keywords that replaced it, for
now the simpler keywords are still supported and "list" and "map" are
interpreted as list(any) and map(any) respectively, mimicking how they
were interpreted by Terraform 0.11 and earlier. For the time being our
documentation should continue to recommend these shorthand versions until
we gain more experience with the more-specific type constraints; most
users should just make use of the additional primitive type constraints
this enables: bool and number.

As a result of these more-complete type constraints, we can now type-check
the default value at config load time, which has the nice side-effect of
allowing us to produce a tailored error message if an override file
produces an invalid situation; previously the result was rather confusing
because the error message referred to the original definition of the
variable and not the overridden parts.

Martin Atkins

7c8efe103e

configs: allow overrides files to omit args that primary files can't

Some of the fields in our config structs are either mandatory in primary
files or there is a default value that we apply if absent.

Unfortunately override files impose the additional constraint that we
be allowed to omit required fields (which have presumably already been
set in the primary files) and that we are able to distinguish between a
default value and omitting a value entirely.

Since most of our fields were already acceptable for override files, here
we just add some new fields to deal with the few cases where special
handling is required and a helper function to disable the "Required" flag
on attributes in a given schema.

Martin Atkins

e15ec486bf

configs: Parser.LoadConfigFile

This is a first pass of decoding of the main Terraform configuration file
format. It hasn't yet been tested with any real-world configurations, so
it will need to be revised further as we test it more thoroughly.

3 Commits (b41f08d79d2a2e8dea1fa690c19bb6dff249e141)