Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
330 lines (256 sloc) 8.86 KB
package terraform
import (
"context"
"fmt"
"log"
"sync"
"github.com/hashicorp/terraform/plans"
"github.com/hashicorp/terraform/providers"
"github.com/hashicorp/terraform/provisioners"
"github.com/hashicorp/terraform/version"
"github.com/hashicorp/terraform/states"
"github.com/hashicorp/hcl2/hcl"
"github.com/hashicorp/terraform/configs/configschema"
"github.com/hashicorp/terraform/lang"
"github.com/hashicorp/terraform/tfdiags"
"github.com/hashicorp/terraform/addrs"
"github.com/zclconf/go-cty/cty"
)
// BuiltinEvalContext is an EvalContext implementation that is used by
// Terraform by default.
type BuiltinEvalContext struct {
// StopContext is the context used to track whether we're complete
StopContext context.Context
// PathValue is the Path that this context is operating within.
PathValue addrs.ModuleInstance
// Evaluator is used for evaluating expressions within the scope of this
// eval context.
Evaluator *Evaluator
// Schemas is a repository of all of the schemas we should need to
// decode configuration blocks and expressions. This must be constructed by
// the caller to include schemas for all of the providers, resource types,
// data sources and provisioners used by the given configuration and
// state.
//
// This must not be mutated during evaluation.
Schemas *Schemas
// VariableValues contains the variable values across all modules. This
// structure is shared across the entire containing context, and so it
// may be accessed only when holding VariableValuesLock.
// The keys of the first level of VariableValues are the string
// representations of addrs.ModuleInstance values. The second-level keys
// are variable names within each module instance.
VariableValues map[string]map[string]cty.Value
VariableValuesLock *sync.Mutex
Components contextComponentFactory
Hooks []Hook
InputValue UIInput
ProviderCache map[string]providers.Interface
ProviderInputConfig map[string]map[string]cty.Value
ProviderLock *sync.Mutex
ProvisionerCache map[string]provisioners.Interface
ProvisionerLock *sync.Mutex
ChangesValue *plans.ChangesSync
StateValue *states.SyncState
once sync.Once
}
// BuiltinEvalContext implements EvalContext
var _ EvalContext = (*BuiltinEvalContext)(nil)
func (ctx *BuiltinEvalContext) Stopped() <-chan struct{} {
// This can happen during tests. During tests, we just block forever.
if ctx.StopContext == nil {
return nil
}
return ctx.StopContext.Done()
}
func (ctx *BuiltinEvalContext) Hook(fn func(Hook) (HookAction, error)) error {
for _, h := range ctx.Hooks {
action, err := fn(h)
if err != nil {
return err
}
switch action {
case HookActionContinue:
continue
case HookActionHalt:
// Return an early exit error to trigger an early exit
log.Printf("[WARN] Early exit triggered by hook: %T", h)
return EvalEarlyExitError{}
}
}
return nil
}
func (ctx *BuiltinEvalContext) Input() UIInput {
return ctx.InputValue
}
func (ctx *BuiltinEvalContext) InitProvider(typeName string, addr addrs.ProviderConfig) (providers.Interface, error) {
ctx.once.Do(ctx.init)
absAddr := addr.Absolute(ctx.Path())
// If we already initialized, it is an error
if p := ctx.Provider(absAddr); p != nil {
return nil, fmt.Errorf("%s is already initialized", addr)
}
// Warning: make sure to acquire these locks AFTER the call to Provider
// above, since it also acquires locks.
ctx.ProviderLock.Lock()
defer ctx.ProviderLock.Unlock()
key := absAddr.String()
p, err := ctx.Components.ResourceProvider(typeName, key)
if err != nil {
return nil, err
}
log.Printf("[TRACE] BuiltinEvalContext: Initialized %q provider for %s", typeName, absAddr)
ctx.ProviderCache[key] = p
return p, nil
}
func (ctx *BuiltinEvalContext) Provider(addr addrs.AbsProviderConfig) providers.Interface {
ctx.once.Do(ctx.init)
ctx.ProviderLock.Lock()
defer ctx.ProviderLock.Unlock()
return ctx.ProviderCache[addr.String()]
}
func (ctx *BuiltinEvalContext) ProviderSchema(addr addrs.AbsProviderConfig) *ProviderSchema {
ctx.once.Do(ctx.init)
return ctx.Schemas.ProviderSchema(addr.ProviderConfig.Type)
}
func (ctx *BuiltinEvalContext) CloseProvider(addr addrs.ProviderConfig) error {
ctx.once.Do(ctx.init)
ctx.ProviderLock.Lock()
defer ctx.ProviderLock.Unlock()
key := addr.Absolute(ctx.Path()).String()
provider := ctx.ProviderCache[key]
if provider != nil {
delete(ctx.ProviderCache, key)
return provider.Close()
}
return nil
}
func (ctx *BuiltinEvalContext) ConfigureProvider(addr addrs.ProviderConfig, cfg cty.Value) tfdiags.Diagnostics {
var diags tfdiags.Diagnostics
absAddr := addr.Absolute(ctx.Path())
p := ctx.Provider(absAddr)
if p == nil {
diags = diags.Append(fmt.Errorf("%s not initialized", addr))
return diags
}
providerSchema := ctx.ProviderSchema(absAddr)
if providerSchema == nil {
diags = diags.Append(fmt.Errorf("schema for %s is not available", absAddr))
return diags
}
req := providers.ConfigureRequest{
TerraformVersion: version.String(),
Config: cfg,
}
resp := p.Configure(req)
return resp.Diagnostics
}
func (ctx *BuiltinEvalContext) ProviderInput(pc addrs.ProviderConfig) map[string]cty.Value {
ctx.ProviderLock.Lock()
defer ctx.ProviderLock.Unlock()
if !ctx.Path().IsRoot() {
// Only root module provider configurations can have input.
return nil
}
return ctx.ProviderInputConfig[pc.String()]
}
func (ctx *BuiltinEvalContext) SetProviderInput(pc addrs.ProviderConfig, c map[string]cty.Value) {
absProvider := pc.Absolute(ctx.Path())
if !ctx.Path().IsRoot() {
// Only root module provider configurations can have input.
log.Printf("[WARN] BuiltinEvalContext: attempt to SetProviderInput for non-root module")
return
}
// Save the configuration
ctx.ProviderLock.Lock()
ctx.ProviderInputConfig[absProvider.String()] = c
ctx.ProviderLock.Unlock()
}
func (ctx *BuiltinEvalContext) InitProvisioner(n string) (provisioners.Interface, error) {
ctx.once.Do(ctx.init)
// If we already initialized, it is an error
if p := ctx.Provisioner(n); p != nil {
return nil, fmt.Errorf("Provisioner '%s' already initialized", n)
}
// Warning: make sure to acquire these locks AFTER the call to Provisioner
// above, since it also acquires locks.
ctx.ProvisionerLock.Lock()
defer ctx.ProvisionerLock.Unlock()
key := PathObjectCacheKey(ctx.Path(), n)
p, err := ctx.Components.ResourceProvisioner(n, key)
if err != nil {
return nil, err
}
ctx.ProvisionerCache[key] = p
return p, nil
}
func (ctx *BuiltinEvalContext) Provisioner(n string) provisioners.Interface {
ctx.once.Do(ctx.init)
ctx.ProvisionerLock.Lock()
defer ctx.ProvisionerLock.Unlock()
key := PathObjectCacheKey(ctx.Path(), n)
return ctx.ProvisionerCache[key]
}
func (ctx *BuiltinEvalContext) ProvisionerSchema(n string) *configschema.Block {
ctx.once.Do(ctx.init)
return ctx.Schemas.ProvisionerConfig(n)
}
func (ctx *BuiltinEvalContext) CloseProvisioner(n string) error {
ctx.once.Do(ctx.init)
ctx.ProvisionerLock.Lock()
defer ctx.ProvisionerLock.Unlock()
key := PathObjectCacheKey(ctx.Path(), n)
prov := ctx.ProvisionerCache[key]
if prov != nil {
return prov.Close()
}
return nil
}
func (ctx *BuiltinEvalContext) EvaluateBlock(body hcl.Body, schema *configschema.Block, self addrs.Referenceable, keyData InstanceKeyEvalData) (cty.Value, hcl.Body, tfdiags.Diagnostics) {
var diags tfdiags.Diagnostics
scope := ctx.EvaluationScope(self, keyData)
body, evalDiags := scope.ExpandBlock(body, schema)
diags = diags.Append(evalDiags)
val, evalDiags := scope.EvalBlock(body, schema)
diags = diags.Append(evalDiags)
return val, body, diags
}
func (ctx *BuiltinEvalContext) EvaluateExpr(expr hcl.Expression, wantType cty.Type, self addrs.Referenceable) (cty.Value, tfdiags.Diagnostics) {
scope := ctx.EvaluationScope(self, EvalDataForNoInstanceKey)
return scope.EvalExpr(expr, wantType)
}
func (ctx *BuiltinEvalContext) EvaluationScope(self addrs.Referenceable, keyData InstanceKeyEvalData) *lang.Scope {
data := &evaluationStateData{
Evaluator: ctx.Evaluator,
ModulePath: ctx.PathValue,
InstanceKeyData: keyData,
Operation: ctx.Evaluator.Operation,
}
return ctx.Evaluator.Scope(data, self)
}
func (ctx *BuiltinEvalContext) Path() addrs.ModuleInstance {
return ctx.PathValue
}
func (ctx *BuiltinEvalContext) SetModuleCallArguments(n addrs.ModuleCallInstance, vals map[string]cty.Value) {
ctx.VariableValuesLock.Lock()
defer ctx.VariableValuesLock.Unlock()
childPath := n.ModuleInstance(ctx.PathValue)
key := childPath.String()
args := ctx.VariableValues[key]
if args == nil {
args = make(map[string]cty.Value)
ctx.VariableValues[key] = vals
return
}
for k, v := range vals {
args[k] = v
}
}
func (ctx *BuiltinEvalContext) Changes() *plans.ChangesSync {
return ctx.ChangesValue
}
func (ctx *BuiltinEvalContext) State() *states.SyncState {
return ctx.StateValue
}
func (ctx *BuiltinEvalContext) init() {
}
You can’t perform that action at this time.