1 files changed, 81 insertions, 0 deletions

diff --git a/vendor/github.com/hashicorp/terraform/terraform/resource_provider.go b/vendor/github.com/hashicorp/terraform/terraform/resource_provider.go
index 1a68c86..7d78f67 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/resource_provider.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/resource_provider.go
@@ -1,5 +1,12 @@
 package terraform
 
+import (
+        "fmt"
+
+        multierror "github.com/hashicorp/go-multierror"
+        "github.com/hashicorp/terraform/plugin/discovery"
+)
+
 // ResourceProvider is an interface that must be implemented by any
 // resource provider: the thing that creates and manages the resources in
 // a Terraform configuration.
@@ -154,6 +161,18 @@ type ResourceProvider interface {
         ReadDataApply(*InstanceInfo, *InstanceDiff) (*InstanceState, error)
 }
 
+// ResourceProviderError may be returned when creating a Context if the
+// required providers cannot be satisfied. This error can then be used to
+// format a more useful message for the user.
+type ResourceProviderError struct {
+        Errors []error
+}
+
+func (e *ResourceProviderError) Error() string {
+        // use multierror to format the default output
+        return multierror.Append(nil, e.Errors...).Error()
+}
+
 // ResourceProviderCloser is an interface that providers that can close
 // connections that aren't needed anymore must implement.
 type ResourceProviderCloser interface {
@@ -171,6 +190,50 @@ type DataSource struct {
         Name string
 }
 
+// ResourceProviderResolver is an interface implemented by objects that are
+// able to resolve a given set of resource provider version constraints
+// into ResourceProviderFactory callbacks.
+type ResourceProviderResolver interface {
+        // Given a constraint map, return a ResourceProviderFactory for each
+        // requested provider. If some or all of the constraints cannot be
+        // satisfied, return a non-nil slice of errors describing the problems.
+        ResolveProviders(reqd discovery.PluginRequirements) (map[string]ResourceProviderFactory, []error)
+}
+
+// ResourceProviderResolverFunc wraps a callback function and turns it into
+// a ResourceProviderResolver implementation, for convenience in situations
+// where a function and its associated closure are sufficient as a resolver
+// implementation.
+type ResourceProviderResolverFunc func(reqd discovery.PluginRequirements) (map[string]ResourceProviderFactory, []error)
+
+// ResolveProviders implements ResourceProviderResolver by calling the
+// wrapped function.
+func (f ResourceProviderResolverFunc) ResolveProviders(reqd discovery.PluginRequirements) (map[string]ResourceProviderFactory, []error) {
+        return f(reqd)
+}
+
+// ResourceProviderResolverFixed returns a ResourceProviderResolver that
+// has a fixed set of provider factories provided by the caller. The returned
+// resolver ignores version constraints entirely and just returns the given
+// factory for each requested provider name.
+//
+// This function is primarily used in tests, to provide mock providers or
+// in-process providers under test.
+func ResourceProviderResolverFixed(factories map[string]ResourceProviderFactory) ResourceProviderResolver {
+        return ResourceProviderResolverFunc(func(reqd discovery.PluginRequirements) (map[string]ResourceProviderFactory, []error) {
+                ret := make(map[string]ResourceProviderFactory, len(reqd))
+                var errs []error
+                for name := range reqd {
+                        if factory, exists := factories[name]; exists {
+                                ret[name] = factory
+                        } else {
+                                errs = append(errs, fmt.Errorf("provider %q is not available", name))
+                        }
+                }
+                return ret, errs
+        })
+}
+
 // ResourceProviderFactory is a function type that creates a new instance
 // of a resource provider.
 type ResourceProviderFactory func() (ResourceProvider, error)
@@ -202,3 +265,21 @@ func ProviderHasDataSource(p ResourceProvider, n string) bool {
 
         return false
 }
+
+// resourceProviderFactories matches available plugins to the given version
+// requirements to produce a map of compatible provider plugins if possible,
+// or an error if the currently-available plugins are insufficient.
+//
+// This should be called only with configurations that have passed calls
+// to config.Validate(), which ensures that all of the given version
+// constraints are valid. It will panic if any invalid constraints are present.
+func resourceProviderFactories(resolver ResourceProviderResolver, reqd discovery.PluginRequirements) (map[string]ResourceProviderFactory, error) {
+        ret, errs := resolver.ResolveProviders(reqd)
+        if errs != nil {
+                return nil, &ResourceProviderError{
+                        Errors: errs,
+                }
+        }
+
+        return ret, nil
+}