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Package config

v0.6.14
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Published: Mar 21, 2016 | License: MPL-2.0 | Module: github.com/meteor/terraform

Overview

The config package is responsible for loading and validating the configuration.

Index

Constants

const UnknownVariableValue = "74D93920-ED26-11E3-AC10-0800200C9A66"

UnknownVariableValue is a sentinel value that can be used to denote that the value of a variable is unknown at this time. RawConfig uses this information to build up data about unknown keys.

Variables

var NameRegexp = regexp.MustCompile(`\A[A-Za-z0-9\-\_]+\z`)

NameRegexp is the regular expression that all names (modules, providers, resources, etc.) must follow.

func Funcs

func Funcs() map[string]ast.Function

Funcs is the mapping of built-in functions for configuration.

func IsEmptyDir

func IsEmptyDir(root string) (bool, error)

IsEmptyDir returns true if the directory given has no Terraform configuration files.

func IsStringList

func IsStringList(s string) bool

Determines if a given string represents a StringList

func ProviderConfigName

func ProviderConfigName(t string, pcs []*ProviderConfig) string

ProviderConfigName returns the name of the provider configuration in the given mapping that maps to the proper provider configuration for this resource.

type AtlasConfig

type AtlasConfig struct {
	Name    string
	Include []string
	Exclude []string
}

AtlasConfig is the configuration for building in HashiCorp's Atlas.

type Config

type Config struct {
	// Dir is the path to the directory where this configuration was
	// loaded from. If it is blank, this configuration wasn't loaded from
	// any meaningful directory.
	Dir string

	Atlas           *AtlasConfig
	Modules         []*Module
	ProviderConfigs []*ProviderConfig
	Resources       []*Resource
	Variables       []*Variable
	Outputs         []*Output
	// contains filtered or unexported fields
}

Config is the configuration that comes from loading a collection of Terraform templates.

func Append

func Append(c1, c2 *Config) (*Config, error)

Append appends one configuration to another.

Append assumes that both configurations will not have conflicting variables, resources, etc. If they do, the problems will be caught in the validation phase.

It is possible that c1, c2 on their own are not valid. For example, a resource in c2 may reference a variable in c1. But together, they would be valid.

func LoadDir

func LoadDir(root string) (*Config, error)

LoadDir loads all the Terraform configuration files in a single directory and appends them together.

Special files known as "override files" can also be present, which are merged into the loaded configuration. That is, the non-override files are loaded first to create the configuration. Then, the overrides are merged into the configuration to create the final configuration.

Files are loaded in lexical order.

func LoadFile

func LoadFile(path string) (*Config, error)

LoadFile loads the Terraform configuration from a given file.

This file can be any format that Terraform recognizes, and import any other format that Terraform recognizes.

func LoadJSON

func LoadJSON(raw json.RawMessage) (*Config, error)

LoadJSON loads a single Terraform configuration from a given JSON document.

The document must be a complete Terraform configuration. This function will NOT try to load any additional modules so only the given document is loaded.

func Merge

func Merge(c1, c2 *Config) (*Config, error)

Merge merges two configurations into a single configuration.

Merge allows for the two configurations to have duplicate resources, because the resources will be merged. This differs from a single Config which must only have unique resources.

func (*Config) InterpolatedVariables

func (c *Config) InterpolatedVariables() map[string][]InterpolatedVariable

InterpolatedVariables is a helper that returns a mapping of all the interpolated variables within the configuration. This is used to verify references are valid in the Validate step.

func (*Config) TestString

func (c *Config) TestString() string

TestString is a Stringer-like function that outputs a string that can be used to easily compare multiple Config structures in unit tests.

This function has no practical use outside of unit tests and debugging.

func (*Config) Validate

func (c *Config) Validate() error

Validate does some basic semantic checking of the configuration.

type CountValueType

type CountValueType byte

CountValueType is the type of the count variable that is referenced.

const (
	CountValueInvalid CountValueType = iota
	CountValueIndex
)

type CountVariable

type CountVariable struct {
	Type CountValueType
	// contains filtered or unexported fields
}

CountVariable is a variable for referencing information about the count.

func NewCountVariable

func NewCountVariable(key string) (*CountVariable, error)

func (*CountVariable) FullKey

func (c *CountVariable) FullKey() string

type InterpolatedVariable

type InterpolatedVariable interface {
	FullKey() string
}

An InterpolatedVariable is a variable reference within an interpolation.

Implementations of this interface represents various sources where variables can come from: user variables, resources, etc.

func DetectVariables

func DetectVariables(root ast.Node) ([]InterpolatedVariable, error)

DetectVariables takes an AST root and returns all the interpolated variables that are detected in the AST tree.

func NewInterpolatedVariable

func NewInterpolatedVariable(v string) (InterpolatedVariable, error)

type Module

type Module struct {
	Name      string
	Source    string
	RawConfig *RawConfig
}

Module is a module used within a configuration.

This does not represent a module itself, this represents a module call-site within an existing configuration.

func (*Module) Id

func (r *Module) Id() string

A unique identifier for this module.

type ModuleVariable

type ModuleVariable struct {
	Name  string
	Field string
	// contains filtered or unexported fields
}

A ModuleVariable is a variable that is referencing the output of a module, such as "${module.foo.bar}"

func NewModuleVariable

func NewModuleVariable(key string) (*ModuleVariable, error)

func (*ModuleVariable) FullKey

func (v *ModuleVariable) FullKey() string

type Output

type Output struct {
	Name      string
	RawConfig *RawConfig
}

Output is an output defined within the configuration. An output is resulting data that is highlighted by Terraform when finished.

type PathValueType

type PathValueType byte
const (
	PathValueInvalid PathValueType = iota
	PathValueCwd
	PathValueModule
	PathValueRoot
)

type PathVariable

type PathVariable struct {
	Type PathValueType
	// contains filtered or unexported fields
}

A PathVariable is a variable that references path information about the module.

func NewPathVariable

func NewPathVariable(key string) (*PathVariable, error)

func (*PathVariable) FullKey

func (v *PathVariable) FullKey() string

type ProviderConfig

type ProviderConfig struct {
	Name      string
	Alias     string
	RawConfig *RawConfig
}

ProviderConfig is the configuration for a resource provider.

For example, Terraform needs to set the AWS access keys for the AWS resource provider.

func (*ProviderConfig) FullName

func (c *ProviderConfig) FullName() string

func (*ProviderConfig) GoString

func (c *ProviderConfig) GoString() string

type Provisioner

type Provisioner struct {
	Type      string
	RawConfig *RawConfig
	ConnInfo  *RawConfig
}

Provisioner is a configured provisioner step on a resource.

func (*Provisioner) Copy

func (p *Provisioner) Copy() *Provisioner

Copy returns a copy of this Provisioner

type RawConfig

type RawConfig struct {
	Key            string
	Raw            map[string]interface{}
	Interpolations []ast.Node
	Variables      map[string]InterpolatedVariable
	// contains filtered or unexported fields
}

RawConfig is a structure that holds a piece of configuration where te overall structure is unknown since it will be used to configure a plugin or some other similar external component.

RawConfigs can be interpolated with variables that come from other resources, user variables, etc.

RawConfig supports a query-like interface to request information from deep within the structure.

func NewRawConfig

func NewRawConfig(raw map[string]interface{}) (*RawConfig, error)

NewRawConfig creates a new RawConfig structure and populates the publicly readable struct fields.

func (*RawConfig) Config

func (r *RawConfig) Config() map[string]interface{}

Config returns the entire configuration with the variables interpolated from any call to Interpolate.

If any interpolated variables are unknown (value set to UnknownVariableValue), the first non-container (map, slice, etc.) element will be removed from the config. The keys of unknown variables can be found using the UnknownKeys function.

By pruning out unknown keys from the configuration, the raw structure will always successfully decode into its ultimate structure using something like mapstructure.

func (*RawConfig) Copy

func (r *RawConfig) Copy() *RawConfig

Copy returns a copy of this RawConfig, uninterpolated.

func (*RawConfig) GobDecode

func (r *RawConfig) GobDecode(b []byte) error

See GobEncode

func (*RawConfig) GobEncode

func (r *RawConfig) GobEncode() ([]byte, error)

GobEncode is a custom Gob encoder to use so that we only include the raw configuration. Interpolated variables and such are lost and the tree of interpolated variables is recomputed on decode, since it is referentially transparent.

func (*RawConfig) Interpolate

func (r *RawConfig) Interpolate(vs map[string]ast.Variable) error

Interpolate uses the given mapping of variable values and uses those as the values to replace any variables in this raw configuration.

Any prior calls to Interpolate are replaced with this one.

If a variable key is missing, this will panic.

func (*RawConfig) Merge

func (r *RawConfig) Merge(other *RawConfig) *RawConfig

Merge merges another RawConfig into this one (overriding any conflicting values in this config) and returns a new config. The original config is not modified.

func (*RawConfig) UnknownKeys

func (r *RawConfig) UnknownKeys() []string

UnknownKeys returns the keys of the configuration that are unknown because they had interpolated variables that must be computed.

func (*RawConfig) Value

func (r *RawConfig) Value() interface{}

Value returns the value of the configuration if this configuration has a Key set. If this does not have a Key set, nil will be returned.

type Resource

type Resource struct {
	Name         string
	Type         string
	RawCount     *RawConfig
	RawConfig    *RawConfig
	Provisioners []*Provisioner
	Provider     string
	DependsOn    []string
	Lifecycle    ResourceLifecycle
}

A resource represents a single Terraform resource in the configuration. A Terraform resource is something that represents some component that can be created and managed, and has some properties associated with it.

func (*Resource) Copy

func (r *Resource) Copy() *Resource

Copy returns a copy of this Resource. Helpful for avoiding shared config pointers across multiple pieces of the graph that need to do interpolation.

func (*Resource) Count

func (r *Resource) Count() (int, error)

Count returns the count of this resource.

func (*Resource) Id

func (r *Resource) Id() string

A unique identifier for this resource.

type ResourceLifecycle

type ResourceLifecycle struct {
	CreateBeforeDestroy bool     `mapstructure:"create_before_destroy"`
	PreventDestroy      bool     `mapstructure:"prevent_destroy"`
	IgnoreChanges       []string `mapstructure:"ignore_changes"`
}

ResourceLifecycle is used to store the lifecycle tuning parameters to allow customized behavior

func (*ResourceLifecycle) Copy

func (r *ResourceLifecycle) Copy() *ResourceLifecycle

Copy returns a copy of this ResourceLifecycle

type ResourceVariable

type ResourceVariable struct {
	Type  string // Resource type, i.e. "aws_instance"
	Name  string // Resource name
	Field string // Resource field

	Multi bool // True if multi-variable: aws_instance.foo.*.id
	Index int  // Index for multi-variable: aws_instance.foo.1.id == 1
	// contains filtered or unexported fields
}

A ResourceVariable is a variable that is referencing the field of a resource, such as "${aws_instance.foo.ami}"

func NewResourceVariable

func NewResourceVariable(key string) (*ResourceVariable, error)

func (*ResourceVariable) FullKey

func (v *ResourceVariable) FullKey() string

func (*ResourceVariable) ResourceId

func (v *ResourceVariable) ResourceId() string

type SelfVariable

type SelfVariable struct {
	Field string
	// contains filtered or unexported fields
}

SelfVariable is a variable that is referencing the same resource it is running on: "${self.address}"

func NewSelfVariable

func NewSelfVariable(key string) (*SelfVariable, error)

func (*SelfVariable) FullKey

func (v *SelfVariable) FullKey() string

func (*SelfVariable) GoString

func (v *SelfVariable) GoString() string

type SimpleVariable

type SimpleVariable struct {
	Key string
}

SimpleVariable is an unprefixed variable, which can show up when users have strings they are passing down to resources that use interpolation internally. The template_file resource is an example of this.

func NewSimpleVariable

func NewSimpleVariable(key string) (*SimpleVariable, error)

func (*SimpleVariable) FullKey

func (v *SimpleVariable) FullKey() string

func (*SimpleVariable) GoString

func (v *SimpleVariable) GoString() string

type StringList

type StringList string

StringList represents the "poor man's list" that terraform uses internally

func NewStringList

func NewStringList(parts []string) StringList

Build a StringList from a slice

func (StringList) Compact

func (sl StringList) Compact() StringList

Takes a Stringlist and returns one without empty strings in it

func (StringList) Element

func (sl StringList) Element(index int) string

Returns an element at the index, wrapping around the length of the string when index > list length

func (StringList) Length

func (sl StringList) Length() int

Returns the length of the StringList

func (StringList) Slice

func (sl StringList) Slice() []string

Returns a slice of strings as represented by this StringList

func (StringList) String

func (sl StringList) String() string

type UserVariable

type UserVariable struct {
	Name string
	Elem string
	// contains filtered or unexported fields
}

A UserVariable is a variable that is referencing a user variable that is inputted from outside the configuration. This looks like "${var.foo}"

func NewUserVariable

func NewUserVariable(key string) (*UserVariable, error)

func (*UserVariable) FullKey

func (v *UserVariable) FullKey() string

func (*UserVariable) GoString

func (v *UserVariable) GoString() string

type Variable

type Variable struct {
	Name         string
	DeclaredType string `mapstructure:"type"`
	Default      interface{}
	Description  string
}

Variable is a variable defined within the configuration.

func (*Variable) DefaultsMap

func (v *Variable) DefaultsMap() map[string]string

DefaultsMap returns a map of default values for this variable.

func (*Variable) Merge

func (v *Variable) Merge(v2 *Variable) *Variable

Merge merges two variables to create a new third variable.

func (*Variable) Required

func (v *Variable) Required() bool

Required tests whether a variable is required or not.

func (*Variable) Type

func (v *Variable) Type() VariableType

Type returns the type of variable this is.

func (*Variable) ValidateTypeAndDefault

func (v *Variable) ValidateTypeAndDefault() error

ValidateTypeAndDefault ensures that default variable value is compatible with the declared type (if one exists), and that the type is one which is known to Terraform

type VariableType

type VariableType byte

VariableType is the type of value a variable is holding, and returned by the Type() function on variables.

const (
	VariableTypeUnknown VariableType = iota
	VariableTypeString
	VariableTypeMap
)

Package Files

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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