package plugin import ( "context" "errors" "log" "sync" "github.com/zclconf/go-cty/cty" plugin "github.com/hashicorp/go-plugin" proto "github.com/hashicorp/terraform/internal/tfplugin5" "github.com/hashicorp/terraform/plugin/convert" "github.com/hashicorp/terraform/providers" ctyjson "github.com/zclconf/go-cty/cty/json" "github.com/zclconf/go-cty/cty/msgpack" "google.golang.org/grpc" ) // GRPCProviderPlugin implements plugin.GRPCPlugin for the go-plugin package. type GRPCProviderPlugin struct { plugin.Plugin GRPCProvider func() proto.ProviderServer } func (p *GRPCProviderPlugin) GRPCClient(ctx context.Context, broker *plugin.GRPCBroker, c *grpc.ClientConn) (interface{}, error) { return &GRPCProvider{ client: proto.NewProviderClient(c), ctx: ctx, }, nil } func (p *GRPCProviderPlugin) GRPCServer(broker *plugin.GRPCBroker, s *grpc.Server) error { proto.RegisterProviderServer(s, p.GRPCProvider()) return nil } // GRPCProvider handles the client, or core side of the plugin rpc connection. // The GRPCProvider methods are mostly a translation layer between the // terraform provioders types and the grpc proto types, directly converting // between the two. type GRPCProvider struct { // PluginClient provides a reference to the plugin.Client which controls the plugin process. // This allows the GRPCProvider a way to shutdown the plugin process. PluginClient *plugin.Client // TestServer contains a grpc.Server to close when the GRPCProvider is being // used in an end to end test of a provider. TestServer *grpc.Server // Proto client use to make the grpc service calls. client proto.ProviderClient // this context is created by the plugin package, and is canceled when the // plugin process ends. ctx context.Context // schema stores the schema for this provider. This is used to properly // serialize the state for requests. mu sync.Mutex schemas providers.GetSchemaResponse } // getSchema is used internally to get the saved provider schema. The schema // should have already been fetched from the provider, but we have to // synchronize access to avoid being called concurrently with GetSchema. func (p *GRPCProvider) getSchema() providers.GetSchemaResponse { p.mu.Lock() // unlock inline in case GetSchema needs to be called if p.schemas.Provider.Block != nil { p.mu.Unlock() return p.schemas } p.mu.Unlock() // the schema should have been fetched already, but give it another shot // just in case things are being called out of order. This may happen for // tests. schemas := p.GetSchema() if schemas.Diagnostics.HasErrors() { panic(schemas.Diagnostics.Err()) } return schemas } // getResourceSchema is a helper to extract the schema for a resource, and // panics if the schema is not available. func (p *GRPCProvider) getResourceSchema(name string) providers.Schema { schema := p.getSchema() resSchema, ok := schema.ResourceTypes[name] if !ok { panic("unknown resource type " + name) } return resSchema } // gettDatasourceSchema is a helper to extract the schema for a datasource, and // panics if that schema is not available. func (p *GRPCProvider) getDatasourceSchema(name string) providers.Schema { schema := p.getSchema() dataSchema, ok := schema.DataSources[name] if !ok { panic("unknown data source " + name) } return dataSchema } // getProviderMetaSchema is a helper to extract the schema for the meta info // defined for a provider, func (p *GRPCProvider) getProviderMetaSchema() providers.Schema { schema := p.getSchema() return schema.ProviderMeta } func (p *GRPCProvider) GetSchema() (resp providers.GetSchemaResponse) { log.Printf("[TRACE] GRPCProvider: GetSchema") p.mu.Lock() defer p.mu.Unlock() if p.schemas.Provider.Block != nil { return p.schemas } resp.ResourceTypes = make(map[string]providers.Schema) resp.DataSources = make(map[string]providers.Schema) // Some providers may generate quite large schemas, and the internal default // grpc response size limit is 4MB. 64MB should cover most any use case, and // if we get providers nearing that we may want to consider a finer-grained // API to fetch individual resource schemas. // Note: this option is marked as EXPERIMENTAL in the grpc API. const maxRecvSize = 64 << 20 protoResp, err := p.client.GetSchema(p.ctx, new(proto.GetProviderSchema_Request), grpc.MaxRecvMsgSizeCallOption{MaxRecvMsgSize: maxRecvSize}) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) if protoResp.Provider == nil { resp.Diagnostics = resp.Diagnostics.Append(errors.New("missing provider schema")) return resp } resp.Provider = convert.ProtoToProviderSchema(protoResp.Provider) if protoResp.ProviderMeta == nil { log.Printf("[TRACE] No provider meta schema returned") } else { resp.ProviderMeta = convert.ProtoToProviderSchema(protoResp.ProviderMeta) } for name, res := range protoResp.ResourceSchemas { resp.ResourceTypes[name] = convert.ProtoToProviderSchema(res) } for name, data := range protoResp.DataSourceSchemas { resp.DataSources[name] = convert.ProtoToProviderSchema(data) } p.schemas = resp return resp } func (p *GRPCProvider) PrepareProviderConfig(r providers.PrepareProviderConfigRequest) (resp providers.PrepareProviderConfigResponse) { log.Printf("[TRACE] GRPCProvider: PrepareProviderConfig") schema := p.getSchema() ty := schema.Provider.Block.ImpliedType() mp, err := msgpack.Marshal(r.Config, ty) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq := &proto.PrepareProviderConfig_Request{ Config: &proto.DynamicValue{Msgpack: mp}, } protoResp, err := p.client.PrepareProviderConfig(p.ctx, protoReq) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } config, err := decodeDynamicValue(protoResp.PreparedConfig, ty) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.PreparedConfig = config resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) return resp } func (p *GRPCProvider) ValidateResourceTypeConfig(r providers.ValidateResourceTypeConfigRequest) (resp providers.ValidateResourceTypeConfigResponse) { log.Printf("[TRACE] GRPCProvider: ValidateResourceTypeConfig") resourceSchema := p.getResourceSchema(r.TypeName) mp, err := msgpack.Marshal(r.Config, resourceSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq := &proto.ValidateResourceTypeConfig_Request{ TypeName: r.TypeName, Config: &proto.DynamicValue{Msgpack: mp}, } protoResp, err := p.client.ValidateResourceTypeConfig(p.ctx, protoReq) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) return resp } func (p *GRPCProvider) ValidateDataSourceConfig(r providers.ValidateDataSourceConfigRequest) (resp providers.ValidateDataSourceConfigResponse) { log.Printf("[TRACE] GRPCProvider: ValidateDataSourceConfig") dataSchema := p.getDatasourceSchema(r.TypeName) mp, err := msgpack.Marshal(r.Config, dataSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq := &proto.ValidateDataSourceConfig_Request{ TypeName: r.TypeName, Config: &proto.DynamicValue{Msgpack: mp}, } protoResp, err := p.client.ValidateDataSourceConfig(p.ctx, protoReq) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) return resp } func (p *GRPCProvider) UpgradeResourceState(r providers.UpgradeResourceStateRequest) (resp providers.UpgradeResourceStateResponse) { log.Printf("[TRACE] GRPCProvider: UpgradeResourceState") resSchema := p.getResourceSchema(r.TypeName) protoReq := &proto.UpgradeResourceState_Request{ TypeName: r.TypeName, Version: int64(r.Version), RawState: &proto.RawState{ Json: r.RawStateJSON, Flatmap: r.RawStateFlatmap, }, } protoResp, err := p.client.UpgradeResourceState(p.ctx, protoReq) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) ty := resSchema.Block.ImpliedType() resp.UpgradedState = cty.NullVal(ty) if protoResp.UpgradedState == nil { return resp } state, err := decodeDynamicValue(protoResp.UpgradedState, ty) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.UpgradedState = state return resp } func (p *GRPCProvider) Configure(r providers.ConfigureRequest) (resp providers.ConfigureResponse) { log.Printf("[TRACE] GRPCProvider: Configure") schema := p.getSchema() var mp []byte // we don't have anything to marshal if there's no config mp, err := msgpack.Marshal(r.Config, schema.Provider.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq := &proto.Configure_Request{ TerraformVersion: r.TerraformVersion, Config: &proto.DynamicValue{ Msgpack: mp, }, } protoResp, err := p.client.Configure(p.ctx, protoReq) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) return resp } func (p *GRPCProvider) Stop() error { log.Printf("[TRACE] GRPCProvider: Stop") resp, err := p.client.Stop(p.ctx, new(proto.Stop_Request)) if err != nil { return err } if resp.Error != "" { return errors.New(resp.Error) } return nil } func (p *GRPCProvider) ReadResource(r providers.ReadResourceRequest) (resp providers.ReadResourceResponse) { log.Printf("[TRACE] GRPCProvider: ReadResource") resSchema := p.getResourceSchema(r.TypeName) metaSchema := p.getProviderMetaSchema() mp, err := msgpack.Marshal(r.PriorState, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq := &proto.ReadResource_Request{ TypeName: r.TypeName, CurrentState: &proto.DynamicValue{Msgpack: mp}, Private: r.Private, } if metaSchema.Block != nil { metaMP, err := msgpack.Marshal(r.ProviderMeta, metaSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq.ProviderMeta = &proto.DynamicValue{Msgpack: metaMP} } protoResp, err := p.client.ReadResource(p.ctx, protoReq) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) state, err := decodeDynamicValue(protoResp.NewState, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.NewState = state resp.Private = protoResp.Private return resp } func (p *GRPCProvider) PlanResourceChange(r providers.PlanResourceChangeRequest) (resp providers.PlanResourceChangeResponse) { log.Printf("[TRACE] GRPCProvider: PlanResourceChange") resSchema := p.getResourceSchema(r.TypeName) metaSchema := p.getProviderMetaSchema() priorMP, err := msgpack.Marshal(r.PriorState, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } configMP, err := msgpack.Marshal(r.Config, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } propMP, err := msgpack.Marshal(r.ProposedNewState, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq := &proto.PlanResourceChange_Request{ TypeName: r.TypeName, PriorState: &proto.DynamicValue{Msgpack: priorMP}, Config: &proto.DynamicValue{Msgpack: configMP}, ProposedNewState: &proto.DynamicValue{Msgpack: propMP}, PriorPrivate: r.PriorPrivate, } if metaSchema.Block != nil { metaMP, err := msgpack.Marshal(r.ProviderMeta, metaSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq.ProviderMeta = &proto.DynamicValue{Msgpack: metaMP} } protoResp, err := p.client.PlanResourceChange(p.ctx, protoReq) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) state, err := decodeDynamicValue(protoResp.PlannedState, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.PlannedState = state for _, p := range protoResp.RequiresReplace { resp.RequiresReplace = append(resp.RequiresReplace, convert.AttributePathToPath(p)) } resp.PlannedPrivate = protoResp.PlannedPrivate resp.LegacyTypeSystem = protoResp.LegacyTypeSystem return resp } func (p *GRPCProvider) ApplyResourceChange(r providers.ApplyResourceChangeRequest) (resp providers.ApplyResourceChangeResponse) { log.Printf("[TRACE] GRPCProvider: ApplyResourceChange") resSchema := p.getResourceSchema(r.TypeName) metaSchema := p.getProviderMetaSchema() priorMP, err := msgpack.Marshal(r.PriorState, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } plannedMP, err := msgpack.Marshal(r.PlannedState, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } configMP, err := msgpack.Marshal(r.Config, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq := &proto.ApplyResourceChange_Request{ TypeName: r.TypeName, PriorState: &proto.DynamicValue{Msgpack: priorMP}, PlannedState: &proto.DynamicValue{Msgpack: plannedMP}, Config: &proto.DynamicValue{Msgpack: configMP}, PlannedPrivate: r.PlannedPrivate, } if metaSchema.Block != nil { metaMP, err := msgpack.Marshal(r.ProviderMeta, metaSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq.ProviderMeta = &proto.DynamicValue{Msgpack: metaMP} } protoResp, err := p.client.ApplyResourceChange(p.ctx, protoReq) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) resp.Private = protoResp.Private state, err := decodeDynamicValue(protoResp.NewState, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.NewState = state resp.LegacyTypeSystem = protoResp.LegacyTypeSystem return resp } func (p *GRPCProvider) ImportResourceState(r providers.ImportResourceStateRequest) (resp providers.ImportResourceStateResponse) { log.Printf("[TRACE] GRPCProvider: ImportResourceState") protoReq := &proto.ImportResourceState_Request{ TypeName: r.TypeName, Id: r.ID, } protoResp, err := p.client.ImportResourceState(p.ctx, protoReq) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) for _, imported := range protoResp.ImportedResources { resource := providers.ImportedResource{ TypeName: imported.TypeName, Private: imported.Private, } resSchema := p.getResourceSchema(resource.TypeName) state, err := decodeDynamicValue(imported.State, resSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resource.State = state resp.ImportedResources = append(resp.ImportedResources, resource) } return resp } func (p *GRPCProvider) ReadDataSource(r providers.ReadDataSourceRequest) (resp providers.ReadDataSourceResponse) { log.Printf("[TRACE] GRPCProvider: ReadDataSource") dataSchema := p.getDatasourceSchema(r.TypeName) metaSchema := p.getProviderMetaSchema() config, err := msgpack.Marshal(r.Config, dataSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq := &proto.ReadDataSource_Request{ TypeName: r.TypeName, Config: &proto.DynamicValue{ Msgpack: config, }, } if metaSchema.Block != nil { metaMP, err := msgpack.Marshal(r.ProviderMeta, metaSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } protoReq.ProviderMeta = &proto.DynamicValue{Msgpack: metaMP} } protoResp, err := p.client.ReadDataSource(p.ctx, protoReq) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.Diagnostics = resp.Diagnostics.Append(convert.ProtoToDiagnostics(protoResp.Diagnostics)) state, err := decodeDynamicValue(protoResp.State, dataSchema.Block.ImpliedType()) if err != nil { resp.Diagnostics = resp.Diagnostics.Append(err) return resp } resp.State = state return resp } // closing the grpc connection is final, and terraform will call it at the end of every phase. func (p *GRPCProvider) Close() error { log.Printf("[TRACE] GRPCProvider: Close") // Make sure to stop the server if we're not running within go-plugin. if p.TestServer != nil { p.TestServer.Stop() } // Check this since it's not automatically inserted during plugin creation. // It's currently only inserted by the command package, because that is // where the factory is built and is the only point with access to the // plugin.Client. if p.PluginClient == nil { log.Println("[DEBUG] provider has no plugin.Client") return nil } p.PluginClient.Kill() return nil } // Decode a DynamicValue from either the JSON or MsgPack encoding. func decodeDynamicValue(v *proto.DynamicValue, ty cty.Type) (cty.Value, error) { // always return a valid value var err error res := cty.NullVal(ty) if v == nil { return res, nil } switch { case len(v.Msgpack) > 0: res, err = msgpack.Unmarshal(v.Msgpack, ty) case len(v.Json) > 0: res, err = ctyjson.Unmarshal(v.Json, ty) } return res, err }