terraform/helper/plugin/grpc_provider.go

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package plugin
import (
"encoding/json"
"errors"
"strconv"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/msgpack"
context "golang.org/x/net/context"
"github.com/hashicorp/terraform/config/hcl2shim"
"github.com/hashicorp/terraform/configs/configschema"
"github.com/hashicorp/terraform/helper/schema"
"github.com/hashicorp/terraform/plugin/convert"
"github.com/hashicorp/terraform/plugin/proto"
"github.com/hashicorp/terraform/terraform"
)
// NewGRPCProviderServerShim wraps a terraform.ResourceProvider in a
// proto.ProviderServer implementation. If the provided provider is not a
// *schema.Provider, this will return nil,
func NewGRPCProviderServerShim(p terraform.ResourceProvider) *GRPCProviderServer {
sp, ok := p.(*schema.Provider)
if !ok {
return nil
}
return &GRPCProviderServer{
provider: sp,
}
}
// GRPCProviderServer handles the server, or plugin side of the rpc connection.
type GRPCProviderServer struct {
provider *schema.Provider
}
func (s *GRPCProviderServer) GetSchema(_ context.Context, req *proto.GetProviderSchema_Request) (*proto.GetProviderSchema_Response, error) {
resp := &proto.GetProviderSchema_Response{
ResourceSchemas: make(map[string]*proto.Schema),
DataSourceSchemas: make(map[string]*proto.Schema),
}
resp.Provider = &proto.Schema{
Block: convert.ConfigSchemaToProto(s.getProviderSchemaBlock()),
}
for typ, res := range s.provider.ResourcesMap {
resp.ResourceSchemas[typ] = &proto.Schema{
Version: int64(res.SchemaVersion),
Block: convert.ConfigSchemaToProto(res.CoreConfigSchema()),
}
}
for typ, dat := range s.provider.DataSourcesMap {
resp.DataSourceSchemas[typ] = &proto.Schema{
Version: int64(dat.SchemaVersion),
Block: convert.ConfigSchemaToProto(dat.CoreConfigSchema()),
}
}
return resp, nil
}
func (s *GRPCProviderServer) getProviderSchemaBlock() *configschema.Block {
return schema.InternalMap(s.provider.Schema).CoreConfigSchema()
}
func (s *GRPCProviderServer) getResourceSchemaBlock(name string) *configschema.Block {
res := s.provider.ResourcesMap[name]
return res.CoreConfigSchema()
}
func (s *GRPCProviderServer) getDatasourceSchemaBlock(name string) *configschema.Block {
dat := s.provider.DataSourcesMap[name]
return dat.CoreConfigSchema()
}
func (s *GRPCProviderServer) ValidateProviderConfig(_ context.Context, req *proto.ValidateProviderConfig_Request) (*proto.ValidateProviderConfig_Response, error) {
resp := &proto.ValidateProviderConfig_Response{}
block := s.getProviderSchemaBlock()
configVal, err := msgpack.Unmarshal(req.Config.Msgpack, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
config := terraform.NewResourceConfigShimmed(configVal, block)
warns, errs := s.provider.Validate(config)
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, convert.WarnsAndErrsToProto(warns, errs))
return resp, nil
}
func (s *GRPCProviderServer) ValidateResourceTypeConfig(_ context.Context, req *proto.ValidateResourceTypeConfig_Request) (*proto.ValidateResourceTypeConfig_Response, error) {
resp := &proto.ValidateResourceTypeConfig_Response{}
block := s.getResourceSchemaBlock(req.TypeName)
configVal, err := msgpack.Unmarshal(req.Config.Msgpack, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
config := terraform.NewResourceConfigShimmed(configVal, block)
warns, errs := s.provider.ValidateResource(req.TypeName, config)
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, convert.WarnsAndErrsToProto(warns, errs))
return resp, nil
}
func (s *GRPCProviderServer) ValidateDataSourceConfig(_ context.Context, req *proto.ValidateDataSourceConfig_Request) (*proto.ValidateDataSourceConfig_Response, error) {
resp := &proto.ValidateDataSourceConfig_Response{}
block := s.getDatasourceSchemaBlock(req.TypeName)
configVal, err := msgpack.Unmarshal(req.Config.Msgpack, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
config := terraform.NewResourceConfigShimmed(configVal, block)
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warns, errs := s.provider.ValidateDataSource(req.TypeName, config)
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, convert.WarnsAndErrsToProto(warns, errs))
return resp, nil
}
func (s *GRPCProviderServer) UpgradeResourceState(_ context.Context, req *proto.UpgradeResourceState_Request) (*proto.UpgradeResourceState_Response, error) {
resp := &proto.UpgradeResourceState_Response{}
res := s.provider.ResourcesMap[req.TypeName]
block := res.CoreConfigSchema()
version := int(req.Version)
var jsonMap map[string]interface{}
var err error
// if there's a JSON state, we need to decode it.
if req.RawState.Json != nil {
err = json.Unmarshal(req.RawState.Json, &jsonMap)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
}
// We first need to upgrade a flatmap state if it exists.
// There should never be both a JSON and Flatmap state in the request.
if req.RawState.Flatmap != nil {
jsonMap, version, err = s.upgradeFlatmapState(version, req.RawState.Flatmap, res)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
}
// complete the upgrade of the JSON states
jsonMap, err = s.upgradeJSONState(version, jsonMap, res)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
// now we need to turn the state into the default json representation, so
// that it can be re-decoded using the actual schema.
val, err := schema.JSONMapToStateValue(jsonMap, block)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
// encode the final state to the expected msgpack format
newStateMP, err := msgpack.Marshal(val, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
resp.UpgradedState = &proto.DynamicValue{Msgpack: newStateMP}
return resp, nil
}
// upgradeFlatmapState takes a legacy flatmap state, upgrades it using Migrate
// state if necessary, and converts it to the new JSON state format decoded as a
// map[string]interface{}.
// upgradeFlatmapState returns the json map along with the corresponding schema
// version.
func (s *GRPCProviderServer) upgradeFlatmapState(version int, m map[string]string, res *schema.Resource) (map[string]interface{}, int, error) {
// this will be the version we've upgraded so, defaulting to the given
// version in case no migration was called.
upgradedVersion := version
// first determine if we need to call the legacy MigrateState func
requiresMigrate := version < res.SchemaVersion
schemaType := res.CoreConfigSchema().ImpliedType()
// if there are any StateUpgraders, then we need to only compare
// against the first version there
if len(res.StateUpgraders) > 0 {
requiresMigrate = version < res.StateUpgraders[0].Version
}
if requiresMigrate {
if res.MigrateState == nil {
return nil, 0, errors.New("cannot upgrade state, missing MigrateState function")
}
is := &terraform.InstanceState{
ID: m["id"],
Attributes: m,
Meta: map[string]interface{}{
"schema_version": strconv.Itoa(version),
},
}
is, err := res.MigrateState(version, is, s.provider.Meta())
if err != nil {
return nil, 0, err
}
// re-assign the map in case there was a copy made, making sure to keep
// the ID
m := is.Attributes
m["id"] = is.ID
// if there are further upgraders, then we've only updated that far
if len(res.StateUpgraders) > 0 {
schemaType = res.StateUpgraders[0].Type
upgradedVersion = res.StateUpgraders[0].Version
}
} else {
// the schema version may be newer than the MigrateState functions
// handled and older than the current, but still stored in the flatmap
// form. If that's the case, we need to find the correct schema type to
// convert the state.
for _, upgrader := range res.StateUpgraders {
if upgrader.Version == version {
schemaType = upgrader.Type
break
}
}
}
// now we know the state is up to the latest version that handled the
// flatmap format state. Now we can upgrade the format and continue from
// there.
newConfigVal, err := hcl2shim.HCL2ValueFromFlatmap(m, schemaType)
if err != nil {
return nil, 0, err
}
jsonMap, err := schema.StateValueToJSONMap(newConfigVal, schemaType)
return jsonMap, upgradedVersion, err
}
func (s *GRPCProviderServer) upgradeJSONState(version int, m map[string]interface{}, res *schema.Resource) (map[string]interface{}, error) {
var err error
for _, upgrader := range res.StateUpgraders {
if version != upgrader.Version {
continue
}
m, err = upgrader.Upgrade(m, s.provider.Meta())
if err != nil {
return nil, err
}
version++
}
return m, nil
}
func (s *GRPCProviderServer) Stop(_ context.Context, _ *proto.Stop_Request) (*proto.Stop_Response, error) {
resp := &proto.Stop_Response{}
err := s.provider.Stop()
if err != nil {
resp.Error = err.Error()
}
return resp, nil
}
func (s *GRPCProviderServer) Configure(_ context.Context, req *proto.Configure_Request) (*proto.Configure_Response, error) {
resp := &proto.Configure_Response{}
block := s.getProviderSchemaBlock()
configVal, err := msgpack.Unmarshal(req.Config.Msgpack, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
config := terraform.NewResourceConfigShimmed(configVal, block)
err = s.provider.Configure(config)
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
func (s *GRPCProviderServer) ReadResource(_ context.Context, req *proto.ReadResource_Request) (*proto.ReadResource_Response, error) {
resp := &proto.ReadResource_Response{}
res := s.provider.ResourcesMap[req.TypeName]
block := res.CoreConfigSchema()
stateVal, err := msgpack.Unmarshal(req.CurrentState.Msgpack, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
instanceState := schema.InstanceStateFromStateValue(stateVal, res.SchemaVersion)
newInstanceState, err := res.RefreshWithoutUpgrade(instanceState, s.provider.Meta())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
if newInstanceState == nil || newInstanceState.ID == "" {
// The old provider API used an empty id to signal that the remote
// object appears to have been deleted, but our new protocol expects
// to see a null value (in the cty sense) in that case.
newConfigMP, err := msgpack.Marshal(cty.NullVal(block.ImpliedType()), block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
}
resp.NewState = &proto.DynamicValue{
Msgpack: newConfigMP,
}
return resp, nil
}
// helper/schema should always copy the ID over, but do it again just to be safe
newInstanceState.Attributes["id"] = newInstanceState.ID
newConfigVal, err := hcl2shim.HCL2ValueFromFlatmap(newInstanceState.Attributes, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
newConfigMP, err := msgpack.Marshal(newConfigVal, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
resp.NewState = &proto.DynamicValue{
Msgpack: newConfigMP,
}
return resp, nil
}
func (s *GRPCProviderServer) PlanResourceChange(_ context.Context, req *proto.PlanResourceChange_Request) (*proto.PlanResourceChange_Response, error) {
resp := &proto.PlanResourceChange_Response{}
res := s.provider.ResourcesMap[req.TypeName]
block := res.CoreConfigSchema()
priorStateVal, err := msgpack.Unmarshal(req.PriorState.Msgpack, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
proposedNewStateVal, err := msgpack.Unmarshal(req.ProposedNewState.Msgpack, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
info := &terraform.InstanceInfo{
Type: req.TypeName,
}
priorState := schema.InstanceStateFromStateValue(priorStateVal, res.SchemaVersion)
// turn the propsed state into a legacy configuration
config := terraform.NewResourceConfigShimmed(proposedNewStateVal, block)
diff, err := s.provider.Diff(info, priorState, config)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
if diff == nil {
// schema.Provider.Diff returns nil if it ends up making a diff with
// no changes, but our new interface wants us to return an actual
// change description that _shows_ there are no changes, so we need
// to synthesize one here.
resp.PlannedState = req.PriorState
return resp, nil
}
// now we need to apply the diff to the prior state, so get the planned state
plannedStateVal, err := schema.ApplyDiff(priorStateVal, diff, block)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
plannedMP, err := msgpack.Marshal(plannedStateVal, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
resp.PlannedState = &proto.DynamicValue{
Msgpack: plannedMP,
}
// the Meta field gets encoded into PlannedPrivate
plannedPrivate, err := json.Marshal(diff.Meta)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
resp.PlannedPrivate = plannedPrivate
// collect the attributes that require instance replacement, and convert
// them to cty.Paths.
var requiresNew []string
for attr, d := range diff.Attributes {
if d.RequiresNew {
requiresNew = append(requiresNew, attr)
}
}
requiresReplace, err := hcl2shim.RequiresReplace(requiresNew, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
// convert these to the protocol structures
for _, p := range requiresReplace {
resp.RequiresReplace = append(resp.RequiresReplace, pathToAttributePath(p))
}
return resp, nil
}
func (s *GRPCProviderServer) ApplyResourceChange(_ context.Context, req *proto.ApplyResourceChange_Request) (*proto.ApplyResourceChange_Response, error) {
resp := &proto.ApplyResourceChange_Response{}
res := s.provider.ResourcesMap[req.TypeName]
block := res.CoreConfigSchema()
priorStateVal, err := msgpack.Unmarshal(req.PriorState.Msgpack, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
plannedStateVal, err := msgpack.Unmarshal(req.PlannedState.Msgpack, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
info := &terraform.InstanceInfo{
Type: req.TypeName,
}
priorState := schema.InstanceStateFromStateValue(priorStateVal, res.SchemaVersion)
var private map[string]interface{}
if err := json.Unmarshal(req.PlannedPrivate, &private); err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
diff, err := schema.DiffFromValues(priorStateVal, plannedStateVal, res)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
newInstanceState, err := s.provider.Apply(info, priorState, diff)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
newStateVal, err := schema.StateValueFromInstanceState(newInstanceState, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
newStateMP, err := msgpack.Marshal(newStateVal, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
resp.NewState = &proto.DynamicValue{
Msgpack: newStateMP,
}
meta, err := json.Marshal(newInstanceState.Meta)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
resp.Private = meta
return resp, nil
}
func (s *GRPCProviderServer) ImportResourceState(_ context.Context, req *proto.ImportResourceState_Request) (*proto.ImportResourceState_Response, error) {
resp := &proto.ImportResourceState_Response{}
block := s.getResourceSchemaBlock(req.TypeName)
info := &terraform.InstanceInfo{
Type: req.TypeName,
}
newInstanceStates, err := s.provider.ImportState(info, req.Id)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
for _, is := range newInstanceStates {
// copy the ID again just to be sure it wasn't missed
is.Attributes["id"] = is.ID
newStateVal, err := hcl2shim.HCL2ValueFromFlatmap(is.Attributes, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
newStateMP, err := msgpack.Marshal(newStateVal, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
meta, err := json.Marshal(is.Meta)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
// the legacy implementation could only import one type at a time
importedResource := &proto.ImportResourceState_ImportedResource{
TypeName: req.TypeName,
State: &proto.DynamicValue{
Msgpack: newStateMP,
},
Private: meta,
}
resp.ImportedResources = append(resp.ImportedResources, importedResource)
}
return resp, nil
}
func (s *GRPCProviderServer) ReadDataSource(_ context.Context, req *proto.ReadDataSource_Request) (*proto.ReadDataSource_Response, error) {
resp := &proto.ReadDataSource_Response{}
res := s.provider.DataSourcesMap[req.TypeName]
block := res.CoreConfigSchema()
configVal, err := msgpack.Unmarshal(req.Config.Msgpack, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
info := &terraform.InstanceInfo{
Type: req.TypeName,
}
config := terraform.NewResourceConfigShimmed(configVal, block)
// we need to still build the diff separately with the Read method to match
// the old behavior
diff, err := s.provider.ReadDataDiff(info, config)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
// now we can get the new complete data source
newInstanceState, err := s.provider.ReadDataApply(info, diff)
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
newStateVal, err := schema.StateValueFromInstanceState(newInstanceState, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
newStateMP, err := msgpack.Marshal(newStateVal, block.ImpliedType())
if err != nil {
resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, err)
return resp, nil
}
resp.State = &proto.DynamicValue{
Msgpack: newStateMP,
}
return resp, nil
}
func pathToAttributePath(path cty.Path) *proto.AttributePath {
var steps []*proto.AttributePath_Step
for _, step := range path {
switch s := step.(type) {
case cty.GetAttrStep:
steps = append(steps, &proto.AttributePath_Step{
Selector: &proto.AttributePath_Step_AttributeName{
AttributeName: s.Name,
},
})
case cty.IndexStep:
ty := s.Key.Type()
switch ty {
case cty.Number:
i, _ := s.Key.AsBigFloat().Int64()
steps = append(steps, &proto.AttributePath_Step{
Selector: &proto.AttributePath_Step_ElementKeyInt{
ElementKeyInt: i,
},
})
case cty.String:
steps = append(steps, &proto.AttributePath_Step{
Selector: &proto.AttributePath_Step_ElementKeyString{
ElementKeyString: s.Key.AsString(),
},
})
}
}
}
return &proto.AttributePath{Steps: steps}
}