tfaddr

package module
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 Go to latest Published: Nov 15, 2022 License: MPL-2.0 Imports: 6 Imported by: 45

README

terraform-registry-address

This module enables parsing, comparison and canonical representation of Terraform Registry provider addresses (such as registry.terraform.io/grafana/grafana or hashicorp/aws) and module addresses (such as hashicorp/subnets/cidr).

Provider addresses can be found in

Module addresses can be found within source argument of module block in Terraform configuration (*.tf) and parts of the address (namespace and name) in the Registry API.

Compatibility

The module assumes compatibility with Terraform v0.12 and later, which have the mentioned JSON output produced by corresponding CLI flags.

We recommend carefully reading the ambigouous provider addresses section below which may impact versions 0.12 and 0.13.

Other libraries which may help with consuming most of the above Terraform outputs in automation:

Usage

Provider
pAddr, err := ParseProviderSource("hashicorp/aws")
if err != nil {
	// deal with error
}

// pAddr == Provider{
//   Type:      "aws",
//   Namespace: "hashicorp",
//   Hostname:  DefaultProviderRegistryHost,
// }
Module
mAddr, err := ParseModuleSource("hashicorp/consul/aws//modules/consul-cluster")
if err != nil {
	// deal with error
}

// mAddr == Module{
//   Package: ModulePackage{
//     Host:         DefaultProviderRegistryHost,
//     Namespace:    "hashicorp",
//     Name:         "consul",
//     TargetSystem: "aws",
//   },
//   Subdir: "modules/consul-cluster",
// },

Other Module Address Formats

Modules can also be sourced from other sources and these other sources (outside of Terraform Registry) have different address formats, such as ./local or github.com/hashicorp/example.

This library does not recognize such other address formats and it will return error upon parsing these.

Ambiguous Provider Addresses

Qualified addresses with namespace (such as hashicorp/aws) are used exclusively in all recent versions (0.14+) of Terraform. If you only work with Terraform v0.14.0+ configuration/output, you may safely ignore the rest of this section and related part of the API.

There are a few types of ambiguous addresses you may comes accross:

  • Terraform v0.12 uses "namespace-less address", such as aws.
  • Terraform v0.13 may use - as a placeholder for the unknown namespace, resulting in address such as -/aws.
  • Terraform v0.14+ configuration still allows ambiguous providers through provider "<NAME>" {} block without corresponding entry inside required_providers, but these providers are always resolved as hashicorp/<NAME> and all JSON outputs only use that resolved address.

Both ambiguous address formats are accepted by ParseProviderSource()

pAddr, err := ParseProviderSource("aws")
if err != nil {
	// deal with error
}

// pAddr == Provider{
//   Type:      "aws",
//   Namespace: UnknownProviderNamespace,    // "?"
//   Hostname:  DefaultProviderRegistryHost, // "registry.terraform.io"
// }
pAddr.HasKnownNamespace() // == false
pAddr.IsLegacy() // == false

pAddr, err := ParseProviderSource("-/aws")
if err != nil {
	// deal with error
}

// pAddr == Provider{
//   Type:      "aws",
//   Namespace: LegacyProviderNamespace,     // "-"
//   Hostname:  DefaultProviderRegistryHost, // "registry.terraform.io"
// }
pAddr.HasKnownNamespace() // == true
pAddr.IsLegacy() // == true

However NewProvider() will panic if you pass an empty namespace or any placeholder indicating unknown namespace.

NewProvider(DefaultProviderRegistryHost, "", "aws")  // panic
NewProvider(DefaultProviderRegistryHost, "-", "aws") // panic
NewProvider(DefaultProviderRegistryHost, "?", "aws") // panic

If you come across an ambiguous address, you should resolve it to a fully qualified one and use that one instead.

Resolving Ambiguous Address

The Registry API provides the safest way of resolving an ambiguous address.

# grafana (redirected to its own namespace)
$ curl -s https://registry.terraform.io/v1/providers/-/grafana/versions | jq '(.id, .moved_to)'
"terraform-providers/grafana"
"grafana/grafana"

# aws (provider without redirection)
$ curl -s https://registry.terraform.io/v1/providers/-/aws/versions | jq '(.id, .moved_to)'
"hashicorp/aws"
null

When you cache results, ensure you have invalidation mechanism in place as target (migrated) namespace may change.

terraform provider

Like any other legacy address terraform is also ambiguous. Such address may (most unlikely) represent a custom-built provider called terraform, or the now archived hashicorp/terraform provider in the registry, or (most likely) the terraform provider built into 0.11+, which is represented via a dedicated FQN of terraform.io/builtin/terraform in 0.13+.

You may be able to differentiate between these different providers if you know the version of Terraform.

Alternatively you may just treat the address as the builtin provider, i.e. assume all of its logic including schema is contained within Terraform Core.

In such case you should construct the address in the following way

pAddr := NewProvider(BuiltInProviderHost, BuiltInProviderNamespace, "terraform")

Documentation

Index

Examples

Constants

View Source 
const BuiltInProviderHost = svchost.Hostname("terraform.io")

BuiltInProviderHost is the pseudo-hostname used for the "built-in" provider namespace. Built-in provider addresses must also have their namespace set to BuiltInProviderNamespace in order to be considered as built-in.

View Source 
const BuiltInProviderNamespace = "builtin"

BuiltInProviderNamespace is the provider namespace used for "built-in" providers. Built-in provider addresses must also have their hostname set to BuiltInProviderHost in order to be considered as built-in.

The this namespace is literally named "builtin", in the hope that users who see FQNs containing this will be able to infer the way in which they are special, even if they haven't encountered the concept formally yet.

View Source 
const DefaultModuleRegistryHost = svchost.Hostname("registry.terraform.io")

DefaultModuleRegistryHost is the hostname used for registry-based module source addresses that do not have an explicit hostname.

View Source 
const DefaultProviderRegistryHost = svchost.Hostname("registry.terraform.io")

DefaultProviderRegistryHost is the hostname used for provider addresses that do not have an explicit hostname.

View Source 
const LegacyProviderNamespace = "-"

LegacyProviderNamespace is the special string used in the Namespace field of type Provider to mark a legacy provider address. This special namespace value would normally be invalid, and can be used only when the hostname is DefaultProviderRegistryHost because that host owns the mapping from legacy name to FQN. This may be produced by Terraform 0.13.

View Source 
const UnknownProviderNamespace = "?"

UnknownProviderNamespace is the special string used to indicate unknown namespace, e.g. in "aws". This is equivalent to LegacyProviderNamespace for <0.12 style address. This namespace would never be produced by Terraform itself explicitly, it is only an internal placeholder.

Variables

This section is empty.

Functions

func MustParseProviderPart 

func MustParseProviderPart(given string) string

MustParseProviderPart is a wrapper around ParseProviderPart that panics if it returns an error.

func ParseProviderPart 

func ParseProviderPart(given string) (string, error)

ParseProviderPart processes an addrs.Provider namespace or type string provided by an end-user, producing a normalized version if possible or an error if the string contains invalid characters.

A provider part is processed in the same way as an individual label in a DNS domain name: it is transformed to lowercase per the usual DNS case mapping and normalization rules and may contain only letters, digits, and dashes. Additionally, dashes may not appear at the start or end of the string.

These restrictions are intended to allow these names to appear in fussy contexts such as directory/file names on case-insensitive filesystems, repository names on GitHub, etc. We're using the DNS rules in particular, rather than some similar rules defined locally, because the hostname part of an addrs.Provider is already a hostname and it's ideal to use exactly the same case folding and normalization rules for all of the parts.

In practice a provider type string conventionally does not contain dashes either. Such names are permitted, but providers with such type names will be hard to use because their resource type names will not be able to contain the provider type name and thus each resource will need an explicit provider address specified. (A real-world example of such a provider is the "google-beta" variant of the GCP provider, which has resource types that start with the "google_" prefix instead.)

It's valid to pass the result of this function as the argument to a subsequent call, in which case the result will be identical.

func ValidateProviderAddress 

func ValidateProviderAddress(raw string) error

ValidateProviderAddress returns error if the given address is not FQN, that is if it is missing any of the three components from hostname/namespace/name.

Types

type Module 

type Module struct {
	// Package is the registry package that the target module belongs to.
	// The module installer must translate this into a ModuleSourceRemote
	// using the registry API and then take that underlying address's
	// Package in order to find the actual package location.
	Package ModulePackage

	// If Subdir is non-empty then it represents a sub-directory within the
	// remote package that the registry address eventually resolves to.
	// This will ultimately become the suffix of the Subdir of the
	// ModuleSourceRemote that the registry address translates to.
	//
	// Subdir uses a normalized forward-slash-based path syntax within the
	// virtual filesystem represented by the final package. It will never
	// include `../` or `./` sequences.
	Subdir string
}

Module is representing a module listed in a Terraform module registry.

func MustParseModuleSource 

func MustParseModuleSource(raw string) Module

MustParseModuleSource is a wrapper around ParseModuleSource that panics if it returns an error.

func ParseModuleSource 

func ParseModuleSource(raw string) (Module, error)

ParseModuleSource only accepts module registry addresses, and will reject any other address type.

Example 
Output:

tfaddr.Module{Package:tfaddr.ModulePackage{Host:svchost.Hostname("registry.terraform.io"), Namespace:"hashicorp", Name:"consul", TargetSystem:"aws"}, Subdir:"modules/consul-cluster"}

func (Module) ForDisplay 

func (s Module) ForDisplay() string

ForDisplay is similar to String but instead returns a representation of the idiomatic way to write the address in configuration, omitting components that are commonly just implied in addresses written by users.

We typically use this shorter representation in informational messages, such as the note that we're about to start downloading a package.

func (Module) String 

func (s Module) String() string

String returns a full representation of the address, including any additional components that are typically implied by omission in user-written addresses.

We typically use this longer representation in error message, in case the inclusion of normally-omitted components is helpful in debugging unexpected behavior.

type ModulePackage 

type ModulePackage struct {
	Host         svchost.Hostname
	Namespace    string
	Name         string
	TargetSystem string
}

A ModulePackage is an extra indirection over a ModulePackage where we use a module registry to translate a more symbolic address (and associated version constraint given out of band) into a physical source location.

ModulePackage is distinct from ModulePackage because they have disjoint use-cases: registry package addresses are only used to query a registry in order to find a real module package address. These being distinct is intended to help future maintainers more easily follow the series of steps in the module installer, with the help of the type checker.

func (ModulePackage) ForDisplay 

func (s ModulePackage) ForDisplay() string

func (ModulePackage) ForRegistryProtocol 

func (s ModulePackage) ForRegistryProtocol() string

ForRegistryProtocol returns a string representation of just the namespace, name, and target system portions of the address, always omitting the registry hostname and the subdirectory portion, if any.

This is primarily intended for generating addresses to send to the registry in question via the registry protocol, since the protocol skips sending the registry its own hostname as part of identifiers.

func (ModulePackage) String 

func (s ModulePackage) String() string

type ParserError 

type ParserError struct {
	Summary string
	Detail  string
}

func (*ParserError) Error 

func (pe *ParserError) Error() string

type Provider 

type Provider struct {
	Type      string
	Namespace string
	Hostname  svchost.Hostname
}

Provider encapsulates a single provider type. In the future this will be extended to include additional fields including Namespace and SourceHost

func MustParseProviderSource 

func MustParseProviderSource(raw string) Provider

MustParseProviderSource is a wrapper around ParseProviderSource that panics if it returns an error.

func NewProvider 

func NewProvider(hostname svchost.Hostname, namespace, typeName string) Provider

NewProvider constructs a provider address from its parts, and normalizes the namespace and type parts to lowercase using unicode case folding rules so that resulting addrs.Provider values can be compared using standard Go equality rules (==).

The hostname is given as a svchost.Hostname, which is required by the contract of that type to have already been normalized for equality testing.

This function will panic if the given namespace or type name are not valid. When accepting namespace or type values from outside the program, use ParseProviderPart first to check that the given value is valid.

func ParseProviderSource 

func ParseProviderSource(str string) (Provider, error)

ParseProviderSource parses the source attribute and returns a provider. This is intended primarily to parse the FQN-like strings returned by terraform-config-inspect.

The following are valid source string formats: 

name
namespace/name
hostname/namespace/name

"name"-only format is parsed as -/name (i.e. legacy namespace) requiring further identification of the namespace via Registry API

Example 
Output:

tfaddr.Provider{Type:"aws", Namespace:"hashicorp", Hostname:svchost.Hostname("registry.terraform.io")}

func (Provider) Equals 

func (pt Provider) Equals(other Provider) bool

Equals returns true if the receiver and other provider have the same attributes.

func (Provider) ForDisplay 

func (pt Provider) ForDisplay() string

ForDisplay returns a user-friendly FQN string, simplified for readability. If the provider is using the default hostname, the hostname is omitted.

func (Provider) HasKnownNamespace 

func (pt Provider) HasKnownNamespace() bool

HasKnownNamespace returns true if the provider namespace is known (also if it is legacy namespace)

func (Provider) IsBuiltIn 

func (pt Provider) IsBuiltIn() bool

IsBuiltIn returns true if the receiver is the address of a "built-in" provider. That is, a provider under terraform.io/builtin/ which is included as part of the Terraform binary itself rather than one to be installed from elsewhere.

These are ignored by the provider installer because they are assumed to already be available without any further installation.

func (Provider) IsLegacy 

func (pt Provider) IsLegacy() bool

IsLegacy returns true if the provider is a legacy-style provider

func (Provider) IsZero 

func (pt Provider) IsZero() bool

IsZero returns true if the receiver is the zero value of addrs.Provider.

The zero value is not a valid addrs.Provider and calling other methods on such a value is likely to either panic or otherwise misbehave.

func (Provider) LegacyString 

func (pt Provider) LegacyString() string

LegacyString returns the provider type, which is frequently used interchangeably with provider name. This function can and should be removed when provider type is fully integrated. As a safeguard for future refactoring, this function panics if the Provider is not a legacy provider.

func (Provider) LessThan 

func (pt Provider) LessThan(other Provider) bool

LessThan returns true if the receiver should sort before the other given address in an ordered list of provider addresses.

This ordering is an arbitrary one just to allow deterministic results from functions that would otherwise have no natural ordering. It's subject to change in future.

func (Provider) String 

func (pt Provider) String() string

String returns an FQN string, indended for use in machine-readable output.

Source Files

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