terraform

package
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 Go to latest Published: Jul 29, 2014 License: MPL-2.0 Imports: 16 Imported by: 0

Documentation

Index

Constants

View Source 
const GraphRootNode = "root"

GraphRootNode is the name of the root node in the Terraform resource graph. This node is just a placemarker and has no associated functionality.

Variables

This section is empty.

Functions

func Graph 

func Graph(opts *GraphOpts) (*depgraph.Graph, error)

Graph builds a dependency graph of all the resources for infrastructure change.

This dependency graph shows the correct order that any resources need to be operated on.

The Meta field of a graph Noun can contain one of the follow types. A description is next to each type to explain what it is. 

*GraphNodeResource - A resource. See the documentation of this
  struct for more details.
*GraphNodeResourceProvider - A resource provider that needs to be
  configured at this point.

func GraphDot 

func GraphDot(g *depgraph.Graph) string

GraphDot returns the dot formatting of a visual representation of the given Terraform graph.

func ProviderSatisfies 

func ProviderSatisfies(p ResourceProvider, n string) bool

func WriteDiff 

func WriteDiff(d *Diff, dst io.Writer) error

WriteDiff writes a diff somewhere in a binary format.

func WritePlan 

func WritePlan(d *Plan, dst io.Writer) error

WritePlan writes a plan somewhere in a binary format.

func WriteState 

func WriteState(d *State, dst io.Writer) error

WriteState writes a state somewhere in a binary format.

Types

type Context 

type Context struct {
	// contains filtered or unexported fields
}

Context represents all the context that Terraform needs in order to perform operations on infrastructure. This structure is built using ContextOpts and NewContext. See the documentation for those.

Additionally, a context can be created from a Plan using Plan.Context.

func NewContext 

func NewContext(opts *ContextOpts) *Context

NewContext creates a new context.

Once a context is created, the pointer values within ContextOpts should not be mutated in any way, since the pointers are copied, not the values themselves.

func (*Context) Apply 

func (c *Context) Apply() (*State, error)

Apply applies the changes represented by this context and returns the resulting state.

In addition to returning the resulting state, this context is updated with the latest state.

func (*Context) Graph 

func (c *Context) Graph() (*depgraph.Graph, error)

Graph returns the graph for this context.

func (*Context) Plan 

func (c *Context) Plan(opts *PlanOpts) (*Plan, error)

Plan generates an execution plan for the given context.

The execution plan encapsulates the context and can be stored in order to reinstantiate a context later for Apply.

Plan also updates the diff of this context to be the diff generated by the plan, so Apply can be called after.

func (*Context) Refresh 

func (c *Context) Refresh() (*State, error)

Refresh goes through all the resources in the state and refreshes them to their latest state. This will update the state that this context works with, along with returning it.

Even in the case an error is returned, the state will be returned and will potentially be partially updated.

func (*Context) Stop 

func (c *Context) Stop()

Stop stops the running task.

Stop will block until the task completes.

func (*Context) Validate 

func (c *Context) Validate() ([]string, []error)

Validate validates the configuration and returns any warnings or errors.

type ContextOpts 

type ContextOpts struct {
	Config       *config.Config
	Diff         *Diff
	Hooks        []Hook
	Parallelism  int
	State        *State
	Providers    map[string]ResourceProviderFactory
	Provisioners map[string]ResourceProvisionerFactory
	Variables    map[string]string
}

ContextOpts are the user-creatable configuration structure to create a context with NewContext.

type Diff 

type Diff struct {
	Resources map[string]*ResourceDiff
	// contains filtered or unexported fields
}

Diff tracks the differences between resources to apply.

func ReadDiff 

func ReadDiff(src io.Reader) (*Diff, error)

ReadDiff reads a diff structure out of a reader in the format that was written by WriteDiff.

func (*Diff) Empty 

func (d *Diff) Empty() bool

Empty returns true if the diff has no changes.

func (*Diff) String 

func (d *Diff) String() string

String outputs the diff in a long but command-line friendly output format that users can read to quickly inspect a diff.

type DiffAttrType 

type DiffAttrType byte

DiffAttrType is an enum type that says whether a resource attribute diff is an input attribute (comes from the configuration) or an output attribute (comes as a result of applying the configuration). An example input would be "ami" for AWS and an example output would be "private_ip". 

const (
	DiffAttrUnknown DiffAttrType = iota
	DiffAttrInput
	DiffAttrOutput
)

type GraphNodeResource 

type GraphNodeResource struct {
	Index              int
	Type               string
	Config             *config.Resource
	Orphan             bool
	Resource           *Resource
	ResourceProviderID string
}

GraphNodeResource is a node type in the graph that represents a resource that will be created or managed. Unlike the GraphNodeResourceMeta node, this represents a _single_, _resource_ to be managed, not a set of resources or a component of a resource.

type GraphNodeResourceMeta 

type GraphNodeResourceMeta struct {
	ID    string
	Name  string
	Type  string
	Count int
}

GraphNodeResourceMeta is a node type in the graph that represents the metadata for a resource. There will be one meta node for every resource in the configuration.

type GraphNodeResourceProvider 

type GraphNodeResourceProvider struct {
	ID           string
	Providers    map[string]ResourceProvider
	ProviderKeys []string
	Config       *config.ProviderConfig
}

GraphNodeResourceProvider is a node type in the graph that represents the configuration for a resource provider.

type GraphOpts 

type GraphOpts struct {
	// Config is the configuration from which to build the basic graph.
	// This is the only required item.
	Config *config.Config

	// Diff of changes that will be applied to the given state. This will
	// associate a ResourceDiff with applicable resources. Additionally,
	// new resource nodes representing resource destruction may be inserted
	// into the graph.
	Diff *Diff

	// State, if present, will make the ResourceState available on each
	// resource node. Additionally, any orphans will be added automatically
	// to the graph.
	State *State

	// Providers is a mapping of prefixes to a resource provider. If given,
	// resource providers will be found, initialized, and associated to the
	// resources in the graph.
	//
	// This will also potentially insert new nodes into the graph for
	// the configuration of resource providers.
	Providers map[string]ResourceProviderFactory

	// Provisioners is a mapping of names to a resource provisioner.
	// These must be provided to support resource provisioners.
	Provisioners map[string]ResourceProvisionerFactory
}

GraphOpts are options used to create the resource graph that Terraform walks to make changes to infrastructure.

Depending on what options are set, the resulting graph will come in varying degrees of completeness.

type Hook 

type Hook interface {
	// PreApply and PostApply are called before and after a single
	// resource is applied. The error argument in PostApply is the
	// error, if any, that was returned from the provider Apply call itself.
	PreApply(string, *ResourceState, *ResourceDiff) (HookAction, error)
	PostApply(string, *ResourceState, error) (HookAction, error)

	// PreDiff and PostDiff are called before and after a single resource
	// resource is diffed.
	PreDiff(string, *ResourceState) (HookAction, error)
	PostDiff(string, *ResourceDiff) (HookAction, error)

	// Provisioning hooks
	PreProvisionResource(string, *ResourceState) (HookAction, error)
	PostProvisionResource(string, *ResourceState) (HookAction, error)
	PreProvision(string, string) (HookAction, error)
	PostProvision(string, string) (HookAction, error)

	// PreRefresh and PostRefresh are called before and after a single
	// resource state is refreshed, respectively.
	PreRefresh(string, *ResourceState) (HookAction, error)
	PostRefresh(string, *ResourceState) (HookAction, error)
}

Hook is the interface that must be implemented to hook into various parts of Terraform, allowing you to inspect or change behavior at runtime.

There are MANY hook points into Terraform. If you only want to implement some hook points, but not all (which is the likely case), then embed the NilHook into your struct, which implements all of the interface but does nothing. Then, override only the functions you want to implement.

type HookAction 

type HookAction byte

HookAction is an enum of actions that can be taken as a result of a hook callback. This allows you to modify the behavior of Terraform at runtime. 

const (
	// HookActionContinue continues with processing as usual.
	HookActionContinue HookAction = iota

	// HookActionHalt halts immediately: no more hooks are processed
	// and the action that Terraform was about to take is cancelled.
	HookActionHalt
)

type MockHook 

type MockHook struct {
	PreApplyCalled bool
	PreApplyId     string
	PreApplyDiff   *ResourceDiff
	PreApplyState  *ResourceState
	PreApplyReturn HookAction
	PreApplyError  error

	PostApplyCalled      bool
	PostApplyId          string
	PostApplyState       *ResourceState
	PostApplyError       error
	PostApplyReturn      HookAction
	PostApplyReturnError error

	PreDiffCalled bool
	PreDiffId     string
	PreDiffState  *ResourceState
	PreDiffReturn HookAction
	PreDiffError  error

	PostDiffCalled bool
	PostDiffId     string
	PostDiffDiff   *ResourceDiff
	PostDiffReturn HookAction
	PostDiffError  error

	PreProvisionResourceCalled bool
	PreProvisionResourceId     string
	PreProvisionResourceState  *ResourceState
	PreProvisionResourceReturn HookAction
	PreProvisionResourceError  error

	PostProvisionResourceCalled bool
	PostProvisionResourceId     string
	PostProvisionResourceState  *ResourceState
	PostProvisionResourceReturn HookAction
	PostProvisionResourceError  error

	PreProvisionCalled        bool
	PreProvisionId            string
	PreProvisionProvisionerId string
	PreProvisionReturn        HookAction
	PreProvisionError         error

	PostProvisionCalled        bool
	PostProvisionId            string
	PostProvisionProvisionerId string
	PostProvisionReturn        HookAction
	PostProvisionError         error

	PostRefreshCalled bool
	PostRefreshId     string
	PostRefreshState  *ResourceState
	PostRefreshReturn HookAction
	PostRefreshError  error

	PreRefreshCalled bool
	PreRefreshId     string
	PreRefreshState  *ResourceState
	PreRefreshReturn HookAction
	PreRefreshError  error
}

MockHook is an implementation of Hook that can be used for tests. It records all of its function calls.

func (*MockHook) PostApply 

func (h *MockHook) PostApply(n string, s *ResourceState, e error) (HookAction, error)

func (*MockHook) PostDiff 

func (h *MockHook) PostDiff(n string, d *ResourceDiff) (HookAction, error)

func (*MockHook) PostProvision 

func (h *MockHook) PostProvision(id, provId string) (HookAction, error)

func (*MockHook) PostProvisionResource 

func (h *MockHook) PostProvisionResource(id string, s *ResourceState) (HookAction, error)

func (*MockHook) PostRefresh 

func (h *MockHook) PostRefresh(n string, s *ResourceState) (HookAction, error)

func (*MockHook) PreApply 

func (h *MockHook) PreApply(n string, s *ResourceState, d *ResourceDiff) (HookAction, error)

func (*MockHook) PreDiff 

func (h *MockHook) PreDiff(n string, s *ResourceState) (HookAction, error)

func (*MockHook) PreProvision 

func (h *MockHook) PreProvision(id, provId string) (HookAction, error)

func (*MockHook) PreProvisionResource 

func (h *MockHook) PreProvisionResource(id string, s *ResourceState) (HookAction, error)

func (*MockHook) PreRefresh 

func (h *MockHook) PreRefresh(n string, s *ResourceState) (HookAction, error)

type MockResourceProvider 

type MockResourceProvider struct {
	sync.Mutex

	// Anything you want, in case you need to store extra data with the mock.
	Meta interface{}

	ApplyCalled                  bool
	ApplyState                   *ResourceState
	ApplyDiff                    *ResourceDiff
	ApplyFn                      func(*ResourceState, *ResourceDiff) (*ResourceState, error)
	ApplyReturn                  *ResourceState
	ApplyReturnError             error
	ConfigureCalled              bool
	ConfigureConfig              *ResourceConfig
	ConfigureReturnError         error
	DiffCalled                   bool
	DiffState                    *ResourceState
	DiffDesired                  *ResourceConfig
	DiffFn                       func(*ResourceState, *ResourceConfig) (*ResourceDiff, error)
	DiffReturn                   *ResourceDiff
	DiffReturnError              error
	RefreshCalled                bool
	RefreshState                 *ResourceState
	RefreshFn                    func(*ResourceState) (*ResourceState, error)
	RefreshReturn                *ResourceState
	RefreshReturnError           error
	ResourcesCalled              bool
	ResourcesReturn              []ResourceType
	ValidateCalled               bool
	ValidateConfig               *ResourceConfig
	ValidateReturnWarns          []string
	ValidateReturnErrors         []error
	ValidateResourceFn           func(string, *ResourceConfig) ([]string, []error)
	ValidateResourceCalled       bool
	ValidateResourceType         string
	ValidateResourceConfig       *ResourceConfig
	ValidateResourceReturnWarns  []string
	ValidateResourceReturnErrors []error
}

MockResourceProvider implements ResourceProvider but mocks out all the calls for testing purposes.

func (*MockResourceProvider) Apply 

func (p *MockResourceProvider) Apply(
	state *ResourceState,
	diff *ResourceDiff) (*ResourceState, error)

func (*MockResourceProvider) Configure 

func (p *MockResourceProvider) Configure(c *ResourceConfig) error

func (*MockResourceProvider) Diff 

func (p *MockResourceProvider) Diff(
	state *ResourceState,
	desired *ResourceConfig) (*ResourceDiff, error)

func (*MockResourceProvider) Refresh 

func (p *MockResourceProvider) Refresh(
	s *ResourceState) (*ResourceState, error)

func (*MockResourceProvider) Resources 

func (p *MockResourceProvider) Resources() []ResourceType

func (*MockResourceProvider) Validate 

func (p *MockResourceProvider) Validate(c *ResourceConfig) ([]string, []error)

func (*MockResourceProvider) ValidateResource 

func (p *MockResourceProvider) ValidateResource(t string, c *ResourceConfig) ([]string, []error)

type MockResourceProvisioner 

type MockResourceProvisioner struct {
	// Anything you want, in case you need to store extra data with the mock.
	Meta interface{}

	ApplyCalled      bool
	ApplyState       *ResourceState
	ApplyConfig      *ResourceConfig
	ApplyFn          func(*ResourceState, *ResourceConfig) error
	ApplyReturnError error

	ValidateCalled       bool
	ValidateConfig       *ResourceConfig
	ValidateFn           func(c *ResourceConfig) ([]string, []error)
	ValidateReturnWarns  []string
	ValidateReturnErrors []error
}

MockResourceProvisioner implements ResourceProvisioner but mocks out all the calls for testing purposes.

func (*MockResourceProvisioner) Apply 

func (p *MockResourceProvisioner) Apply(state *ResourceState, c *ResourceConfig) error

func (*MockResourceProvisioner) Validate 

func (p *MockResourceProvisioner) Validate(c *ResourceConfig) ([]string, []error)

type NilHook 

type NilHook struct{}

NilHook is a Hook implementation that does nothing. It exists only to simplify implementing hooks. You can embed this into your Hook implementation and only implement the functions you are interested in.

func (*NilHook) PostApply 

func (*NilHook) PostApply(string, *ResourceState, error) (HookAction, error)

func (*NilHook) PostDiff 

func (*NilHook) PostDiff(string, *ResourceDiff) (HookAction, error)

func (*NilHook) PostProvision 

func (*NilHook) PostProvision(string, string) (HookAction, error)

func (*NilHook) PostProvisionResource 

func (*NilHook) PostProvisionResource(string, *ResourceState) (HookAction, error)

func (*NilHook) PostRefresh 

func (*NilHook) PostRefresh(string, *ResourceState) (HookAction, error)

func (*NilHook) PreApply 

func (*NilHook) PreApply(string, *ResourceState, *ResourceDiff) (HookAction, error)

func (*NilHook) PreDiff 

func (*NilHook) PreDiff(string, *ResourceState) (HookAction, error)

func (*NilHook) PreProvision 

func (*NilHook) PreProvision(string, string) (HookAction, error)

func (*NilHook) PreProvisionResource 

func (*NilHook) PreProvisionResource(string, *ResourceState) (HookAction, error)

func (*NilHook) PreRefresh 

func (*NilHook) PreRefresh(string, *ResourceState) (HookAction, error)

type Plan 

type Plan struct {
	Config *config.Config
	Diff   *Diff
	State  *State
	Vars   map[string]string
	// contains filtered or unexported fields
}

Plan represents a single Terraform execution plan, which contains all the information necessary to make an infrastructure change.

func ReadPlan 

func ReadPlan(src io.Reader) (*Plan, error)

ReadPlan reads a plan structure out of a reader in the format that was written by WritePlan.

func (*Plan) Context 

func (p *Plan) Context(opts *ContextOpts) *Context

Context returns a Context with the data encapsulated in this plan.

The following fields in opts are overridden by the plan: Config, Diff, State, Variables.

func (*Plan) String 

func (p *Plan) String() string

type PlanOpts 

type PlanOpts struct {
	// If set to true, then the generated plan will destroy all resources
	// that are created. Otherwise, it will move towards the desired state
	// specified in the configuration.
	Destroy bool
}

PlanOpts are the options used to generate an execution plan for Terraform.

type Resource 

type Resource struct {
	Id           string
	Config       *ResourceConfig
	Diff         *ResourceDiff
	Provider     ResourceProvider
	State        *ResourceState
	Provisioners []*ResourceProvisionerConfig
	Tainted      bool
}

Resource encapsulates a resource, its configuration, its provider, its current state, and potentially a desired diff from the state it wants to reach.

func (*Resource) Vars 

func (r *Resource) Vars() map[string]string

Vars returns the mapping of variables that should be replaced in configuration based on the attributes of this resource.

type ResourceAttrDiff 

type ResourceAttrDiff struct {
	Old         string      // Old Value
	New         string      // New Value
	NewComputed bool        // True if new value is computed (unknown currently)
	NewRemoved  bool        // True if this attribute is being removed
	NewExtra    interface{} // Extra information for the provider
	RequiresNew bool        // True if change requires new resource
	Type        DiffAttrType
}

ResourceAttrDiff is the diff of a single attribute of a resource.

func (*ResourceAttrDiff) GoString 

func (d *ResourceAttrDiff) GoString() string

type ResourceConfig 

type ResourceConfig struct {
	ComputedKeys []string
	Raw          map[string]interface{}
	Config       map[string]interface{}
	// contains filtered or unexported fields
}

ResourceConfig holds the configuration given for a resource. This is done instead of a raw `map[string]interface{}` type so that rich methods can be added to it to make dealing with it easier.

func NewResourceConfig 

func NewResourceConfig(c *config.RawConfig) *ResourceConfig

NewResourceConfig creates a new ResourceConfig from a config.RawConfig.

func (*ResourceConfig) CheckSet 

func (c *ResourceConfig) CheckSet(keys []string) []error

CheckSet checks that the given list of configuration keys is properly set. If not, errors are returned for each unset key.

This is useful to be called in the Validate method of a ResourceProvider.

func (*ResourceConfig) Get 

func (c *ResourceConfig) Get(k string) (interface{}, bool)

Get looks up a configuration value by key and returns the value.

The second return value is true if the get was successful. Get will not succeed if the value is being computed.

func (*ResourceConfig) IsSet 

func (c *ResourceConfig) IsSet(k string) bool

IsSet checks if the key in the configuration is set. A key is set if it has a value or the value is being computed (is unknown currently).

This function should be used rather than checking the keys of the raw configuration itself, since a key may be omitted from the raw configuration if it is being computed.

type ResourceDependency 

type ResourceDependency struct {
	// ID of the resource that we depend on. This ID should map
	// directly to another ResourceState's ID.
	ID string
}

ResourceDependency maps a resource to another resource that it depends on to remain intact and uncorrupted.

type ResourceDiff 

type ResourceDiff struct {
	Attributes map[string]*ResourceAttrDiff
	Destroy    bool
	// contains filtered or unexported fields
}

ResourceDiff is the diff of a resource from some state to another.

func (*ResourceDiff) Empty 

func (d *ResourceDiff) Empty() bool

Empty returns true if this diff encapsulates no changes.

func (*ResourceDiff) RequiresNew 

func (d *ResourceDiff) RequiresNew() bool

RequiresNew returns true if the diff requires the creation of a new resource (implying the destruction of the old).

func (*ResourceDiff) Same 

func (d *ResourceDiff) Same(d2 *ResourceDiff) bool

Same checks whether or not to ResourceDiffs are the "same." When we say "same", it is not necessarily exactly equal. Instead, it is just checking that the same attributes are changing, a destroy isn't suddenly happening, etc.

type ResourceProvider 

type ResourceProvider interface {
	// Validate is called once at the beginning with the raw configuration
	// (no interpolation done) and can return a list of warnings and/or
	// errors.
	//
	// This is called once with the provider configuration only. It may not
	// be called at all if no provider configuration is given.
	//
	// This should not assume that any values of the configurations are valid.
	// The primary use case of this call is to check that required keys are
	// set.
	Validate(*ResourceConfig) ([]string, []error)

	// ValidateResource is called once at the beginning with the raw
	// configuration (no interpolation done) and can return a list of warnings
	// and/or errors.
	//
	// This is called once per resource.
	//
	// This should not assume any of the values in the resource configuration
	// are valid since it is possible they have to be interpolated still.
	// The primary use case of this call is to check that the required keys
	// are set and that the general structure is correct.
	ValidateResource(string, *ResourceConfig) ([]string, []error)

	// Configure configures the provider itself with the configuration
	// given. This is useful for setting things like access keys.
	//
	// This won't be called at all if no provider configuration is given.
	//
	// Configure returns an error if it occurred.
	Configure(*ResourceConfig) error

	// Resources returns all the available resource types that this provider
	// knows how to manage.
	Resources() []ResourceType

	// Apply applies a diff to a specific resource and returns the new
	// resource state along with an error.
	//
	// If the resource state given has an empty ID, then a new resource
	// is expected to be created.
	Apply(
		*ResourceState,
		*ResourceDiff) (*ResourceState, error)

	// Diff diffs a resource versus a desired state and returns
	// a diff.
	Diff(
		*ResourceState,
		*ResourceConfig) (*ResourceDiff, error)

	// Refresh refreshes a resource and updates all of its attributes
	// with the latest information.
	Refresh(*ResourceState) (*ResourceState, error)
}

ResourceProvider is an interface that must be implemented by any resource provider: the thing that creates and manages the resources in a Terraform configuration.

type ResourceProviderFactory 

type ResourceProviderFactory func() (ResourceProvider, error)

ResourceProviderFactory is a function type that creates a new instance of a resource provider.

func ResourceProviderFactoryFixed 

func ResourceProviderFactoryFixed(p ResourceProvider) ResourceProviderFactory

ResourceProviderFactoryFixed is a helper that creates a ResourceProviderFactory that just returns some fixed provider.

type ResourceProvisioner 

type ResourceProvisioner interface {
	// Validate is called once at the beginning with the raw
	// configuration (no interpolation done) and can return a list of warnings
	// and/or errors.
	//
	// This is called once per resource.
	//
	// This should not assume any of the values in the resource configuration
	// are valid since it is possible they have to be interpolated still.
	// The primary use case of this call is to check that the required keys
	// are set and that the general structure is correct.
	Validate(*ResourceConfig) ([]string, []error)

	// Apply runs the provisioner on a specific resource and returns the new
	// resource state along with an error. Instead of a diff, the ResourceConfig
	// is provided since provisioners only run after a resource has been
	// newly created.
	Apply(*ResourceState, *ResourceConfig) error
}

ResourceProvisioner is an interface that must be implemented by any resource provisioner: the thing that initializes resources in a Terraform configuration.

type ResourceProvisionerConfig 

type ResourceProvisionerConfig struct {
	Type        string
	Provisioner ResourceProvisioner
	Config      *ResourceConfig
	RawConfig   *config.RawConfig
	ConnInfo    *config.RawConfig
}

ResourceProvisionerConfig is used to pair a provisioner with it's provided configuration. This allows us to use singleton instances of each ResourceProvisioner and to keep the relevant configuration instead of instantiating a new Provisioner for each resource.

type ResourceProvisionerFactory 

type ResourceProvisionerFactory func() (ResourceProvisioner, error)

ResourceProvisionerFactory is a function type that creates a new instance of a resource provisioner.

type ResourceState 

type ResourceState struct {
	// This is filled in and managed by Terraform, and is the resource
	// type itself such as "mycloud_instance". If a resource provider sets
	// this value, it won't be persisted.
	Type string

	// A unique ID for this resource. This is opaque to Terraform
	// and is only meant as a lookup mechanism for the providers.
	ID string

	// Attributes are basic information about the resource. Any keys here
	// are accessible in variable format within Terraform configurations:
	// ${resourcetype.name.attribute}.
	Attributes map[string]string

	// ConnInfo is used for the providers to export information which is
	// used to connect to the resource for provisioning. For example,
	// this could contain SSH or WinRM credentials.
	ConnInfo map[string]string

	// Extra information that the provider can store about a resource.
	// This data is opaque, never shown to the user, and is sent back to
	// the provider as-is for whatever purpose appropriate.
	Extra map[string]interface{}

	// Dependencies are a list of things that this resource relies on
	// existing to remain intact. For example: an AWS instance might
	// depend on a subnet (which itself might depend on a VPC, and so
	// on).
	//
	// Terraform uses this information to build valid destruction
	// orders and to warn the user if they're destroying a resource that
	// another resource depends on.
	//
	// Things can be put into this list that may not be managed by
	// Terraform. If Terraform doesn't find a matching ID in the
	// overall state, then it assumes it isn't managed and doesn't
	// worry about it.
	Dependencies []ResourceDependency
}

ResourceState holds the state of a resource that is used so that a provider can find and manage an existing resource as well as for storing attributes that are uesd to populate variables of child resources.

Attributes has attributes about the created resource that are queryable in interpolation: "${type.id.attr}"

Extra is just extra data that a provider can return that we store for later, but is not exposed in any way to the user.

func (*ResourceState) MergeDiff 

func (s *ResourceState) MergeDiff(d *ResourceDiff) *ResourceState

MergeDiff takes a ResourceDiff and merges the attributes into this resource state in order to generate a new state. This new state can be used to provide updated attribute lookups for variable interpolation.

If the diff attribute requires computing the value, and hence won't be available until apply, the value is replaced with the computeID.

type ResourceType 

type ResourceType struct {
	Name string
}

ResourceType is a type of resource that a resource provider can manage.

type State 

type State struct {
	Outputs   map[string]string
	Resources map[string]*ResourceState
	Tainted   map[string]struct{}
	// contains filtered or unexported fields
}

State keeps track of a snapshot state-of-the-world that Terraform can use to keep track of what real world resources it is actually managing.

func ReadState 

func ReadState(src io.Reader) (*State, error)

ReadState reads a state structure out of a reader in the format that was written by WriteState.

func (*State) Orphans 

func (s *State) Orphans(c *config.Config) []string

Orphans returns a list of keys of resources that are in the State but aren't present in the configuration itself. Hence, these keys represent the state of resources that are orphans.

func (*State) String 

func (s *State) String() string

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