Clean up language and resource providers in query

The @pulumi/pulumi TypScript SDK exposes `streamInvoke`, which returns a
(potentially infinite) stream of responses. This currently is _assumed_
to be infinite, in that there is no way to signal cancellation, and
prevents Pulumi from being able to clean up when we're finished using
the results of the `streamInvoke`.

This commit will introduce a `StreamInvokeResult` type, which is an
`AsyncIterable` that also exposes a `cancel` function, whih does just
this.

Use it like this:

    // `streamInvoke` to retrieve all updates to any `Deployment`, enumerate 0
    // updates from the stream, then `cancel` giving the Kubernetes provider to
    // clean up and close gracefully.
    const deployments = await streamInvoke("kubernetes:kubernetes:watch", {
        group: "apps", version: "v1", kind: "Deployment",
        break;
    });
    deployments.cancel();

CHANGELOG.md

@@ -28,6 +28,9 @@ CHANGELOG
 - Support for lists and maps in config.
   [#3342](https://github.com/pulumi/pulumi/pull/3342)
 
+- `ResourceProvider#StreamInvoke` implemented, will be the basis for streaming
+  APIs in `pulumi query`. [#3424](https://github.com/pulumi/pulumi/pull/3424)
+
 ## 1.4.0 (2019-10-24)
 
 - `FileAsset` in the Python SDK now accepts anything implementing `os.PathLike` in addition to `str`.
@@ -72,7 +75,7 @@ CHANGELOG
 
 - Support renaming stack projects via `pulumi stack rename`.
   [#3292](https://github.com/pulumi/pulumi/pull/3292)
-  
+
 - Add `helm` to `pulumi/pulumi` Dockerhub container
   [#3294](https://github.com/pulumi/pulumi/pull/3294)
 

pkg/engine/query.go

@@ -75,6 +75,7 @@ func Query(ctx *Context, q QueryInfo, opts UpdateOptions) result.Result {
 	if err != nil {
 		return result.FromError(err)
 	}
+	defer plugctx.Close()
 
 	return query(ctx, q, QueryOptions{
 		Events:      emitter,

pkg/resource/deploy/builtins.go

@@ -158,6 +158,13 @@ func (p *builtinProvider) Invoke(tok tokens.ModuleMember,
 	return outs, nil, nil
 }
 
+func (p *builtinProvider) StreamInvoke(
+	tok tokens.ModuleMember, args resource.PropertyMap,
+	onNext func(resource.PropertyMap) error) ([]plugin.CheckFailure, error) {
+
+	return nil, fmt.Errorf("the builtin provider does not implement streaming invokes")
+}
+
 func (p *builtinProvider) GetPluginInfo() (workspace.PluginInfo, error) {
 	// return an error: this should not be called for the builtin provider
 	return workspace.PluginInfo{}, errors.New("the builtin provider does not report plugin info")

pkg/resource/deploy/deploytest/provider.go

@@ -15,6 +15,8 @@
 package deploytest
 
 import (
+	"fmt"
+
 	"github.com/blang/semver"
 	uuid "github.com/satori/go.uuid"
 
@@ -155,3 +157,10 @@ func (prov *Provider) Invoke(tok tokens.ModuleMember,
 	}
 	return prov.InvokeF(tok, args)
 }
+
+func (prov *Provider) StreamInvoke(
+	tok tokens.ModuleMember, args resource.PropertyMap,
+	onNext func(resource.PropertyMap) error) ([]plugin.CheckFailure, error) {
+
+	return nil, fmt.Errorf("not implemented")
+}

pkg/resource/deploy/providers/registry.go

@@ -384,6 +384,13 @@ func (r *Registry) Invoke(tok tokens.ModuleMember,
 	return nil, nil, errors.New("the provider registry is not invokable")
 }
 
+func (r *Registry) StreamInvoke(
+	tok tokens.ModuleMember, args resource.PropertyMap,
+	onNext func(resource.PropertyMap) error) ([]plugin.CheckFailure, error) {
+
+	return nil, fmt.Errorf("the provider registry does not implement streaming invokes")
+}
+
 func (r *Registry) GetPluginInfo() (workspace.PluginInfo, error) {
 	// return an error: this should not be called for the provider registry
 	return workspace.PluginInfo{}, errors.New("the provider registry does not report plugin info")

pkg/resource/deploy/providers/registry_test.go

@@ -15,6 +15,7 @@
 package providers
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/blang/semver"
@@ -142,6 +143,12 @@ func (prov *testProvider) Invoke(tok tokens.ModuleMember,
 	args resource.PropertyMap) (resource.PropertyMap, []plugin.CheckFailure, error) {
 	return nil, nil, errors.New("unsupported")
 }
+func (prov *testProvider) StreamInvoke(
+	tok tokens.ModuleMember, args resource.PropertyMap,
+	onNext func(resource.PropertyMap) error) ([]plugin.CheckFailure, error) {
+
+	return nil, fmt.Errorf("not implemented")
+}
 func (prov *testProvider) GetPluginInfo() (workspace.PluginInfo, error) {
 	return workspace.PluginInfo{
 		Name:    "testProvider",

pkg/resource/deploy/source_eval.go

@@ -579,6 +579,12 @@ func (rm *resmon) Invoke(ctx context.Context, req *pulumirpc.InvokeRequest) (*pu
 	return &pulumirpc.InvokeResponse{Return: mret, Failures: chkfails}, nil
 }
 
+func (rm *resmon) StreamInvoke(
+	req *pulumirpc.InvokeRequest, stream pulumirpc.ResourceMonitor_StreamInvokeServer) error {
+
+	return fmt.Errorf("the resource monitor does not implement streaming invokes")
+}
+
 // ReadResource reads the current state associated with a resource from its provider plugin.
 func (rm *resmon) ReadResource(ctx context.Context,
 	req *pulumirpc.ReadResourceRequest) (*pulumirpc.ReadResourceResponse, error) {

pkg/resource/deploy/source_query.go

@@ -105,7 +105,6 @@ type querySource struct {
 func (src *querySource) Close() error {
 	// Cancel the monitor and reclaim any associated resources.
 	src.done = true
-	close(src.langPluginFinChan)
 	return src.mon.Cancel()
 }
 
@@ -341,6 +340,53 @@ func (rm *queryResmon) Invoke(ctx context.Context, req *pulumirpc.InvokeRequest)
 	return &pulumirpc.InvokeResponse{Return: mret, Failures: chkfails}, nil
 }
 
+func (rm *queryResmon) StreamInvoke(
+	req *pulumirpc.InvokeRequest, stream pulumirpc.ResourceMonitor_StreamInvokeServer) error {
+
+	tok := tokens.ModuleMember(req.GetTok())
+	label := fmt.Sprintf("QueryResourceMonitor.StreamInvoke(%s)", tok)
+
+	providerReq, err := parseProviderRequest(tok.Package(), req.GetVersion())
+	if err != nil {
+		return err
+	}
+	prov, err := getProviderFromSource(rm.reg, rm.defaultProviders, providerReq, req.GetProvider())
+	if err != nil {
+		return err
+	}
+
+	args, err := plugin.UnmarshalProperties(
+		req.GetArgs(), plugin.MarshalOptions{Label: label, KeepUnknowns: true})
+	if err != nil {
+		return errors.Wrapf(err, "failed to unmarshal %v args", tok)
+	}
+
+	// Synchronously do the StreamInvoke and then return the arguments. This will block until the
+	// streaming operation completes!
+	logging.V(5).Infof("ResourceMonitor.StreamInvoke received: tok=%v #args=%v", tok, len(args))
+	failures, err := prov.StreamInvoke(tok, args, func(event resource.PropertyMap) error {
+		mret, err := plugin.MarshalProperties(event, plugin.MarshalOptions{Label: label, KeepUnknowns: true})
+		if err != nil {
+			return errors.Wrapf(err, "failed to marshal return")
+		}
+
+		return stream.Send(&pulumirpc.InvokeResponse{Return: mret})
+	})
+	if err != nil {
+		return errors.Wrapf(err, "streaming invocation of %v returned an error", tok)
+	}
+
+	var chkfails []*pulumirpc.CheckFailure
+	for _, failure := range failures {
+		chkfails = append(chkfails, &pulumirpc.CheckFailure{
+			Property: string(failure.Property),
+			Reason:   failure.Reason,
+		})
+	}
+
+	return stream.Send(&pulumirpc.InvokeResponse{Failures: chkfails})
+}
+
 // ReadResource reads the current state associated with a resource from its provider plugin.
 func (rm *queryResmon) ReadResource(ctx context.Context,
 	req *pulumirpc.ReadResourceRequest) (*pulumirpc.ReadResourceResponse, error) {

pkg/resource/plugin/provider.go

@@ -71,6 +71,12 @@ type Provider interface {
 	Delete(urn resource.URN, id resource.ID, props resource.PropertyMap, timeout float64) (resource.Status, error)
 	// Invoke dynamically executes a built-in function in the provider.
 	Invoke(tok tokens.ModuleMember, args resource.PropertyMap) (resource.PropertyMap, []CheckFailure, error)
+	// StreamInvoke dynamically executes a built-in function in the provider, which returns a stream
+	// of responses.
+	StreamInvoke(
+		tok tokens.ModuleMember,
+		args resource.PropertyMap,
+		onNext func(resource.PropertyMap) error) ([]CheckFailure, error)
 	// GetPluginInfo returns this plugin's information.
 	GetPluginInfo() (workspace.PluginInfo, error)
 

pkg/resource/plugin/provider_plugin.go

@@ -16,6 +16,7 @@ package plugin
 
 import (
 	"fmt"
+	"io"
 	"strings"
 
 	"github.com/blang/semver"
@@ -954,6 +955,81 @@ func (p *provider) Invoke(tok tokens.ModuleMember, args resource.PropertyMap) (r
 	return ret, failures, nil
 }
 
+// StreamInvoke dynamically executes a built-in function in the provider, which returns a stream of
+// responses.
+func (p *provider) StreamInvoke(
+	tok tokens.ModuleMember,
+	args resource.PropertyMap,
+	onNext func(resource.PropertyMap) error) ([]CheckFailure, error) {
+
+	contract.Assert(tok != "")
+
+	label := fmt.Sprintf("%s.StreamInvoke(%s)", p.label(), tok)
+	logging.V(7).Infof("%s executing (#args=%d)", label, len(args))
+
+	// Get the RPC client and ensure it's configured.
+	client, err := p.getClient()
+	if err != nil {
+		return nil, err
+	}
+
+	// If the provider is not fully configured, return an empty property map.
+	if !p.cfgknown {
+		return nil, onNext(resource.PropertyMap{})
+	}
+
+	margs, err := MarshalProperties(args, MarshalOptions{
+		Label:       fmt.Sprintf("%s.args", label),
+		KeepSecrets: p.acceptSecrets,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	streamClient, err := client.StreamInvoke(
+		p.ctx.Request(), &pulumirpc.InvokeRequest{Tok: string(tok), Args: margs})
+	if err != nil {
+		rpcError := rpcerror.Convert(err)
+		logging.V(7).Infof("%s failed: %v", label, rpcError.Message())
+		return nil, rpcError
+	}
+
+	for {
+		in, err := streamClient.Recv()
+		if err == io.EOF {
+			return nil, nil
+		}
+		if err != nil {
+			return nil, err
+		}
+
+		// Unmarshal response.
+		ret, err := UnmarshalProperties(in.GetReturn(), MarshalOptions{
+			Label:          fmt.Sprintf("%s.returns", label),
+			RejectUnknowns: true,
+			KeepSecrets:    true,
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		// Check properties that failed verification.
+		var failures []CheckFailure
+		for _, failure := range in.GetFailures() {
+			failures = append(failures, CheckFailure{resource.PropertyKey(failure.Property), failure.Reason})
+		}
+
+		if len(failures) > 0 {
+			return failures, nil
+		}
+
+		// Send stream message back to whoever is consuming the stream.
+		if err := onNext(ret); err != nil {
+			return nil, err
+		}
+	}
+}
+
 // GetPluginInfo returns this plugin's information.
 func (p *provider) GetPluginInfo() (workspace.PluginInfo, error) {
 	label := fmt.Sprintf("%s.GetPluginInfo()", p.label())

sdk/nodejs/cmd/pulumi-language-nodejs/proxy.go

@@ -191,6 +191,29 @@ func (p *monitorProxy) Invoke(
 	return p.target.Invoke(ctx, req)
 }
 
+func (p *monitorProxy) StreamInvoke(
+	req *pulumirpc.InvokeRequest, server pulumirpc.ResourceMonitor_StreamInvokeServer) error {
+
+	client, err := p.target.StreamInvoke(context.Background(), req)
+	if err != nil {
+		return err
+	}
+
+	for {
+		in, err := client.Recv()
+		if err == io.EOF {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+
+		if err := server.Send(in); err != nil {
+			return err
+		}
+	}
+}
+
 func (p *monitorProxy) ReadResource(
 	ctx context.Context, req *pulumirpc.ReadResourceRequest) (*pulumirpc.ReadResourceResponse, error) {
 	return p.target.ReadResource(ctx, req)

sdk/nodejs/package.json

@@ -5,11 +5,13 @@
     "license": "Apache-2.0",
     "repository": {
         "type": "git",
-        "url" : "https://github.com/pulumi/pulumi.git",
+        "url": "https://github.com/pulumi/pulumi.git",
         "directory": "sdk/nodejs"
     },
     "dependencies": {
         "@pulumi/query": "^0.3.0",
+        "callback-to-async-iterator": "^1.1.1",
+        "deasync": "^0.1.15",
         "google-protobuf": "^3.5.0",
         "grpc": "1.21.1",
         "minimist": "^1.2.0",
@@ -21,17 +23,16 @@
         "source-map-support": "^0.4.16",
         "ts-node": "^7.0.0",
         "typescript": "^3.0.0",
-        "upath": "^1.1.0",
-        "deasync": "^0.1.15"
+        "upath": "^1.1.0"
     },
     "devDependencies": {
+        "@types/deasync": "^0.1.0",
         "@types/minimist": "^1.2.0",
         "@types/mocha": "^2.2.42",
         "@types/node": "^12.0.0",
         "@types/normalize-package-data": "^2.4.0",
         "@types/read-package-tree": "^5.2.0",
         "@types/semver": "^5.5.0",
-        "@types/deasync": "^0.1.0",
         "istanbul": "^0.4.5",
         "mocha": "^3.5.0",
         "node-gyp": "^3.6.2",

sdk/nodejs/proto/provider_grpc_pb.js

@@ -261,6 +261,19 @@ var ResourceProviderService = exports.ResourceProviderService = {
     responseSerialize: serialize_pulumirpc_InvokeResponse,
     responseDeserialize: deserialize_pulumirpc_InvokeResponse,
   },
+  // StreamInvoke dynamically executes a built-in function in the provider, which returns a stream
+  // of responses.
+  streamInvoke: {
+    path: '/pulumirpc.ResourceProvider/StreamInvoke',
+    requestStream: false,
+    responseStream: true,
+    requestType: provider_pb.InvokeRequest,
+    responseType: provider_pb.InvokeResponse,
+    requestSerialize: serialize_pulumirpc_InvokeRequest,
+    requestDeserialize: deserialize_pulumirpc_InvokeRequest,
+    responseSerialize: serialize_pulumirpc_InvokeResponse,
+    responseDeserialize: deserialize_pulumirpc_InvokeResponse,
+  },
   // Check validates that the given property bag is valid for a resource of the given type and returns the inputs
   // that should be passed to successive calls to Diff, Create, or Update for this resource. As a rule, the provider
   // inputs returned by a call to Check should preserve the original representation of the properties as present in

sdk/nodejs/proto/resource_grpc_pb.js

@@ -157,6 +157,17 @@ var ResourceMonitorService = exports.ResourceMonitorService = {
     responseSerialize: serialize_pulumirpc_InvokeResponse,
     responseDeserialize: deserialize_pulumirpc_InvokeResponse,
   },
+  streamInvoke: {
+    path: '/pulumirpc.ResourceMonitor/StreamInvoke',
+    requestStream: false,
+    responseStream: true,
+    requestType: provider_pb.InvokeRequest,
+    responseType: provider_pb.InvokeResponse,
+    requestSerialize: serialize_pulumirpc_InvokeRequest,
+    requestDeserialize: deserialize_pulumirpc_InvokeRequest,
+    responseSerialize: serialize_pulumirpc_InvokeResponse,
+    responseDeserialize: deserialize_pulumirpc_InvokeResponse,
+  },
   readResource: {
     path: '/pulumirpc.ResourceMonitor/ReadResource',
     requestStream: false,

sdk/nodejs/runtime/invoke.ts

@@ -12,8 +12,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+const asyncify = require("callback-to-async-iterator");
+import { AsyncIterable } from "@pulumi/query/interfaces";
 import * as fs from "fs";
 import * as grpc from "grpc";
+
 import * as asset from "../asset";
 import { InvokeOptions } from "../invoke";
 import * as log from "../log";
@@ -78,6 +81,61 @@ export function invoke(tok: string, props: Inputs, opts: InvokeOptions = {}): Pr
     return invokeSync(tok, props, opts, syncInvokes);
 }
 
+export async function streamInvoke(
+    tok: string,
+    props: Inputs,
+    opts: InvokeOptions = {},
+): Promise<StreamInvokeResponse<any>> {
+    const label = `StreamInvoking function: tok=${tok} asynchronously`;
+    log.debug(label + (excessiveDebugOutput ? `, props=${JSON.stringify(props)}` : ``));
+
+    // Wait for all values to be available, and then perform the RPC.
+    const done = rpcKeepAlive();
+    try {
+        const serialized = await serializeProperties(`streamInvoke:${tok}`, props);
+        log.debug(
+            `StreamInvoke RPC prepared: tok=${tok}` + excessiveDebugOutput
+                ? `, obj=${JSON.stringify(serialized)}`
+                : ``,
+        );
+
+        // Fetch the monitor and make an RPC request.
+        const monitor: any = getMonitor();
+
+        const provider = await ProviderResource.register(getProvider(tok, opts));
+        const req = createInvokeRequest(tok, serialized, provider, opts);
+
+        // Call `streamInvoke`.
+        const call = monitor.streamInvoke(req, {});
+
+        // Transform the callback-oriented `streamInvoke` result into a plain-old (potentially
+        // infinite) `AsyncIterable`.
+        const listenForWatchEvents = (callback: (obj: any) => void) => {
+            return new Promise(resolve => {
+                call.on("data", function(thing: any) {
+                    const live = deserializeResponse(tok, thing);
+                    callback(live);
+                });
+                call.on("error", (err: any) => {
+                    if (err.code === 1 && err.details === "Cancelled") {
+                        return;
+                    }
+                    throw err;
+                });
+                // Infinite stream, never call `resolve`.
+            });
+        };
+        const stream: AsyncIterable<any> = asyncify.default(listenForWatchEvents);
+
+        // Return a cancellable handle to the stream.
+        return new StreamInvokeResponse(
+            stream,
+            () => call.cancel());
+    } finally {
+        done();
+    }
+}
+
 export function invokeFallbackToAsync(tok: string, props: Inputs, opts: InvokeOptions): Promise<any> {
     const asyncResult = invokeAsync(tok, props, opts);
     const syncResult = utils.promiseResult(asyncResult);
@@ -178,6 +236,24 @@ For more details see: https://www.pulumi.com/docs/troubleshooting/#synchronous-c
     }
 }
 
+// StreamInvokeResponse represents a (potentially infinite) streaming response to `streamInvoke`,
+// with facilities to gracefully cancel and clean up the stream.
+export class StreamInvokeResponse<T> implements AsyncIterable<T> {
+    constructor(
+        private source: AsyncIterable<T>,
+        private cancelSource: () => void,
+    ) {}
+
+    // cancel signals the `streamInvoke` should be cancelled and cleaned up gracefully.
+    public cancel() {
+        this.cancelSource();
+    }
+
+    [Symbol.asyncIterator]() {
+        return this.source[Symbol.asyncIterator]();
+    }
+}
+
 // Expose the properties of the actual result of invoke directly on the promise itself. Note this
 // doesn't actually involve any asynchrony.  The promise will be created synchronously and the
 // values copied to it can be used immediately.  We simply make a Promise so that any consumers that

sdk/proto/go/provider.pb.go

@@ -57,7 +57,7 @@ func (x PropertyDiff_Kind) String() string {
 	return proto.EnumName(PropertyDiff_Kind_name, int32(x))
 }
 func (PropertyDiff_Kind) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{9, 0}
+	return fileDescriptor_provider_766486f54fa2871e, []int{9, 0}
 }
 
 type DiffResponse_DiffChanges int32
@@ -83,7 +83,7 @@ func (x DiffResponse_DiffChanges) String() string {
 	return proto.EnumName(DiffResponse_DiffChanges_name, int32(x))
 }
 func (DiffResponse_DiffChanges) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{10, 0}
+	return fileDescriptor_provider_766486f54fa2871e, []int{10, 0}
 }
 
 type ConfigureRequest struct {
@@ -99,7 +99,7 @@ func (m *ConfigureRequest) Reset()         { *m = ConfigureRequest{} }
 func (m *ConfigureRequest) String() string { return proto.CompactTextString(m) }
 func (*ConfigureRequest) ProtoMessage()    {}
 func (*ConfigureRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{0}
+	return fileDescriptor_provider_766486f54fa2871e, []int{0}
 }
 func (m *ConfigureRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ConfigureRequest.Unmarshal(m, b)
@@ -151,7 +151,7 @@ func (m *ConfigureResponse) Reset()         { *m = ConfigureResponse{} }
 func (m *ConfigureResponse) String() string { return proto.CompactTextString(m) }
 func (*ConfigureResponse) ProtoMessage()    {}
 func (*ConfigureResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{1}
+	return fileDescriptor_provider_766486f54fa2871e, []int{1}
 }
 func (m *ConfigureResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ConfigureResponse.Unmarshal(m, b)
@@ -190,7 +190,7 @@ func (m *ConfigureErrorMissingKeys) Reset()         { *m = ConfigureErrorMissing
 func (m *ConfigureErrorMissingKeys) String() string { return proto.CompactTextString(m) }
 func (*ConfigureErrorMissingKeys) ProtoMessage()    {}
 func (*ConfigureErrorMissingKeys) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{2}
+	return fileDescriptor_provider_766486f54fa2871e, []int{2}
 }
 func (m *ConfigureErrorMissingKeys) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ConfigureErrorMissingKeys.Unmarshal(m, b)
@@ -229,7 +229,7 @@ func (m *ConfigureErrorMissingKeys_MissingKey) Reset()         { *m = ConfigureE
 func (m *ConfigureErrorMissingKeys_MissingKey) String() string { return proto.CompactTextString(m) }
 func (*ConfigureErrorMissingKeys_MissingKey) ProtoMessage()    {}
 func (*ConfigureErrorMissingKeys_MissingKey) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{2, 0}
+	return fileDescriptor_provider_766486f54fa2871e, []int{2, 0}
 }
 func (m *ConfigureErrorMissingKeys_MissingKey) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ConfigureErrorMissingKeys_MissingKey.Unmarshal(m, b)
@@ -277,7 +277,7 @@ func (m *InvokeRequest) Reset()         { *m = InvokeRequest{} }
 func (m *InvokeRequest) String() string { return proto.CompactTextString(m) }
 func (*InvokeRequest) ProtoMessage()    {}
 func (*InvokeRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{3}
+	return fileDescriptor_provider_766486f54fa2871e, []int{3}
 }
 func (m *InvokeRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_InvokeRequest.Unmarshal(m, b)
@@ -337,7 +337,7 @@ func (m *InvokeResponse) Reset()         { *m = InvokeResponse{} }
 func (m *InvokeResponse) String() string { return proto.CompactTextString(m) }
 func (*InvokeResponse) ProtoMessage()    {}
 func (*InvokeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{4}
+	return fileDescriptor_provider_766486f54fa2871e, []int{4}
 }
 func (m *InvokeResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_InvokeResponse.Unmarshal(m, b)
@@ -384,7 +384,7 @@ func (m *CheckRequest) Reset()         { *m = CheckRequest{} }
 func (m *CheckRequest) String() string { return proto.CompactTextString(m) }
 func (*CheckRequest) ProtoMessage()    {}
 func (*CheckRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{5}
+	return fileDescriptor_provider_766486f54fa2871e, []int{5}
 }
 func (m *CheckRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CheckRequest.Unmarshal(m, b)
@@ -437,7 +437,7 @@ func (m *CheckResponse) Reset()         { *m = CheckResponse{} }
 func (m *CheckResponse) String() string { return proto.CompactTextString(m) }
 func (*CheckResponse) ProtoMessage()    {}
 func (*CheckResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{6}
+	return fileDescriptor_provider_766486f54fa2871e, []int{6}
 }
 func (m *CheckResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CheckResponse.Unmarshal(m, b)
@@ -483,7 +483,7 @@ func (m *CheckFailure) Reset()         { *m = CheckFailure{} }
 func (m *CheckFailure) String() string { return proto.CompactTextString(m) }
 func (*CheckFailure) ProtoMessage()    {}
 func (*CheckFailure) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{7}
+	return fileDescriptor_provider_766486f54fa2871e, []int{7}
 }
 func (m *CheckFailure) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CheckFailure.Unmarshal(m, b)
@@ -532,7 +532,7 @@ func (m *DiffRequest) Reset()         { *m = DiffRequest{} }
 func (m *DiffRequest) String() string { return proto.CompactTextString(m) }
 func (*DiffRequest) ProtoMessage()    {}
 func (*DiffRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{8}
+	return fileDescriptor_provider_766486f54fa2871e, []int{8}
 }
 func (m *DiffRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DiffRequest.Unmarshal(m, b)
@@ -599,7 +599,7 @@ func (m *PropertyDiff) Reset()         { *m = PropertyDiff{} }
 func (m *PropertyDiff) String() string { return proto.CompactTextString(m) }
 func (*PropertyDiff) ProtoMessage()    {}
 func (*PropertyDiff) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{9}
+	return fileDescriptor_provider_766486f54fa2871e, []int{9}
 }
 func (m *PropertyDiff) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_PropertyDiff.Unmarshal(m, b)
@@ -680,7 +680,7 @@ func (m *DiffResponse) Reset()         { *m = DiffResponse{} }
 func (m *DiffResponse) String() string { return proto.CompactTextString(m) }
 func (*DiffResponse) ProtoMessage()    {}
 func (*DiffResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{10}
+	return fileDescriptor_provider_766486f54fa2871e, []int{10}
 }
 func (m *DiffResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DiffResponse.Unmarshal(m, b)
@@ -762,7 +762,7 @@ func (m *CreateRequest) Reset()         { *m = CreateRequest{} }
 func (m *CreateRequest) String() string { return proto.CompactTextString(m) }
 func (*CreateRequest) ProtoMessage()    {}
 func (*CreateRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{11}
+	return fileDescriptor_provider_766486f54fa2871e, []int{11}
 }
 func (m *CreateRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CreateRequest.Unmarshal(m, b)
@@ -815,7 +815,7 @@ func (m *CreateResponse) Reset()         { *m = CreateResponse{} }
 func (m *CreateResponse) String() string { return proto.CompactTextString(m) }
 func (*CreateResponse) ProtoMessage()    {}
 func (*CreateResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{12}
+	return fileDescriptor_provider_766486f54fa2871e, []int{12}
 }
 func (m *CreateResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_CreateResponse.Unmarshal(m, b)
@@ -863,7 +863,7 @@ func (m *ReadRequest) Reset()         { *m = ReadRequest{} }
 func (m *ReadRequest) String() string { return proto.CompactTextString(m) }
 func (*ReadRequest) ProtoMessage()    {}
 func (*ReadRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{13}
+	return fileDescriptor_provider_766486f54fa2871e, []int{13}
 }
 func (m *ReadRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ReadRequest.Unmarshal(m, b)
@@ -924,7 +924,7 @@ func (m *ReadResponse) Reset()         { *m = ReadResponse{} }
 func (m *ReadResponse) String() string { return proto.CompactTextString(m) }
 func (*ReadResponse) ProtoMessage()    {}
 func (*ReadResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{14}
+	return fileDescriptor_provider_766486f54fa2871e, []int{14}
 }
 func (m *ReadResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ReadResponse.Unmarshal(m, b)
@@ -981,7 +981,7 @@ func (m *UpdateRequest) Reset()         { *m = UpdateRequest{} }
 func (m *UpdateRequest) String() string { return proto.CompactTextString(m) }
 func (*UpdateRequest) ProtoMessage()    {}
 func (*UpdateRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{15}
+	return fileDescriptor_provider_766486f54fa2871e, []int{15}
 }
 func (m *UpdateRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_UpdateRequest.Unmarshal(m, b)
@@ -1054,7 +1054,7 @@ func (m *UpdateResponse) Reset()         { *m = UpdateResponse{} }
 func (m *UpdateResponse) String() string { return proto.CompactTextString(m) }
 func (*UpdateResponse) ProtoMessage()    {}
 func (*UpdateResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{16}
+	return fileDescriptor_provider_766486f54fa2871e, []int{16}
 }
 func (m *UpdateResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_UpdateResponse.Unmarshal(m, b)
@@ -1095,7 +1095,7 @@ func (m *DeleteRequest) Reset()         { *m = DeleteRequest{} }
 func (m *DeleteRequest) String() string { return proto.CompactTextString(m) }
 func (*DeleteRequest) ProtoMessage()    {}
 func (*DeleteRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{17}
+	return fileDescriptor_provider_766486f54fa2871e, []int{17}
 }
 func (m *DeleteRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_DeleteRequest.Unmarshal(m, b)
@@ -1159,7 +1159,7 @@ func (m *ErrorResourceInitFailed) Reset()         { *m = ErrorResourceInitFailed
 func (m *ErrorResourceInitFailed) String() string { return proto.CompactTextString(m) }
 func (*ErrorResourceInitFailed) ProtoMessage()    {}
 func (*ErrorResourceInitFailed) Descriptor() ([]byte, []int) {
-	return fileDescriptor_provider_31a5eda36dbe30f0, []int{18}
+	return fileDescriptor_provider_766486f54fa2871e, []int{18}
 }
 func (m *ErrorResourceInitFailed) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ErrorResourceInitFailed.Unmarshal(m, b)
@@ -1253,6 +1253,9 @@ type ResourceProviderClient interface {
 	Configure(ctx context.Context, in *ConfigureRequest, opts ...grpc.CallOption) (*ConfigureResponse, error)
 	// Invoke dynamically executes a built-in function in the provider.
 	Invoke(ctx context.Context, in *InvokeRequest, opts ...grpc.CallOption) (*InvokeResponse, error)
+	// StreamInvoke dynamically executes a built-in function in the provider, which returns a stream
+	// of responses.
+	StreamInvoke(ctx context.Context, in *InvokeRequest, opts ...grpc.CallOption) (ResourceProvider_StreamInvokeClient, error)
 	// Check validates that the given property bag is valid for a resource of the given type and returns the inputs
 	// that should be passed to successive calls to Diff, Create, or Update for this resource. As a rule, the provider
 	// inputs returned by a call to Check should preserve the original representation of the properties as present in
@@ -1321,6 +1324,38 @@ func (c *resourceProviderClient) Invoke(ctx context.Context, in *InvokeRequest,
 	return out, nil
 }
 
+func (c *resourceProviderClient) StreamInvoke(ctx context.Context, in *InvokeRequest, opts ...grpc.CallOption) (ResourceProvider_StreamInvokeClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_ResourceProvider_serviceDesc.Streams[0], c.cc, "/pulumirpc.ResourceProvider/StreamInvoke", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &resourceProviderStreamInvokeClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type ResourceProvider_StreamInvokeClient interface {
+	Recv() (*InvokeResponse, error)
+	grpc.ClientStream
+}
+
+type resourceProviderStreamInvokeClient struct {
+	grpc.ClientStream
+}
+
+func (x *resourceProviderStreamInvokeClient) Recv() (*InvokeResponse, error) {
+	m := new(InvokeResponse)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
 func (c *resourceProviderClient) Check(ctx context.Context, in *CheckRequest, opts ...grpc.CallOption) (*CheckResponse, error) {
 	out := new(CheckResponse)
 	err := grpc.Invoke(ctx, "/pulumirpc.ResourceProvider/Check", in, out, c.cc, opts...)
@@ -1404,6 +1439,9 @@ type ResourceProviderServer interface {
 	Configure(context.Context, *ConfigureRequest) (*ConfigureResponse, error)
 	// Invoke dynamically executes a built-in function in the provider.
 	Invoke(context.Context, *InvokeRequest) (*InvokeResponse, error)
+	// StreamInvoke dynamically executes a built-in function in the provider, which returns a stream
+	// of responses.
+	StreamInvoke(*InvokeRequest, ResourceProvider_StreamInvokeServer) error
 	// Check validates that the given property bag is valid for a resource of the given type and returns the inputs
 	// that should be passed to successive calls to Diff, Create, or Update for this resource. As a rule, the provider
 	// inputs returned by a call to Check should preserve the original representation of the properties as present in
@@ -1504,6 +1542,27 @@ func _ResourceProvider_Invoke_Handler(srv interface{}, ctx context.Context, dec
 	return interceptor(ctx, in, info, handler)
 }
 
+func _ResourceProvider_StreamInvoke_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(InvokeRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(ResourceProviderServer).StreamInvoke(m, &resourceProviderStreamInvokeServer{stream})
+}
+
+type ResourceProvider_StreamInvokeServer interface {
+	Send(*InvokeResponse) error
+	grpc.ServerStream
+}
+
+type resourceProviderStreamInvokeServer struct {
+	grpc.ServerStream
+}
+
+func (x *resourceProviderStreamInvokeServer) Send(m *InvokeResponse) error {
+	return x.ServerStream.SendMsg(m)
+}
+
 func _ResourceProvider_Check_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(CheckRequest)
 	if err := dec(in); err != nil {
@@ -1701,88 +1760,95 @@ var _ResourceProvider_serviceDesc = grpc.ServiceDesc{
 			Handler:    _ResourceProvider_GetPluginInfo_Handler,
 		},
 	},
-	Streams:  []grpc.StreamDesc{},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "StreamInvoke",
+			Handler:       _ResourceProvider_StreamInvoke_Handler,
+			ServerStreams: true,
+		},
+	},
 	Metadata: "provider.proto",
 }
 
-func init() { proto.RegisterFile("provider.proto", fileDescriptor_provider_31a5eda36dbe30f0) }
+func init() { proto.RegisterFile("provider.proto", fileDescriptor_provider_766486f54fa2871e) }
 
-var fileDescriptor_provider_31a5eda36dbe30f0 = []byte{
-	// 1207 bytes of a gzipped FileDescriptorProto
+var fileDescriptor_provider_766486f54fa2871e = []byte{
+	// 1221 bytes of a gzipped FileDescriptorProto
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+	0x18, 0x7f, 0x0f, 0x00, 0x00,
 }

sdk/proto/go/resource.pb.go

@@ -38,7 +38,7 @@ func (m *SupportsFeatureRequest) Reset()         { *m = SupportsFeatureRequest{}
 func (m *SupportsFeatureRequest) String() string { return proto.CompactTextString(m) }
 func (*SupportsFeatureRequest) ProtoMessage()    {}
 func (*SupportsFeatureRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_resource_0e7314448ddfd7ea, []int{0}
+	return fileDescriptor_resource_a4a41d1ddbd1f936, []int{0}
 }
 func (m *SupportsFeatureRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SupportsFeatureRequest.Unmarshal(m, b)
@@ -76,7 +76,7 @@ func (m *SupportsFeatureResponse) Reset()         { *m = SupportsFeatureResponse
 func (m *SupportsFeatureResponse) String() string { return proto.CompactTextString(m) }
 func (*SupportsFeatureResponse) ProtoMessage()    {}
 func (*SupportsFeatureResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_resource_0e7314448ddfd7ea, []int{1}
+	return fileDescriptor_resource_a4a41d1ddbd1f936, []int{1}
 }
 func (m *SupportsFeatureResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_SupportsFeatureResponse.Unmarshal(m, b)
@@ -125,7 +125,7 @@ func (m *ReadResourceRequest) Reset()         { *m = ReadResourceRequest{} }
 func (m *ReadResourceRequest) String() string { return proto.CompactTextString(m) }
 func (*ReadResourceRequest) ProtoMessage()    {}
 func (*ReadResourceRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_resource_0e7314448ddfd7ea, []int{2}
+	return fileDescriptor_resource_a4a41d1ddbd1f936, []int{2}
 }
 func (m *ReadResourceRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ReadResourceRequest.Unmarshal(m, b)
@@ -235,7 +235,7 @@ func (m *ReadResourceResponse) Reset()         { *m = ReadResourceResponse{} }
 func (m *ReadResourceResponse) String() string { return proto.CompactTextString(m) }
 func (*ReadResourceResponse) ProtoMessage()    {}
 func (*ReadResourceResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_resource_0e7314448ddfd7ea, []int{3}
+	return fileDescriptor_resource_a4a41d1ddbd1f936, []int{3}
 }
 func (m *ReadResourceResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ReadResourceResponse.Unmarshal(m, b)
@@ -298,7 +298,7 @@ func (m *RegisterResourceRequest) Reset()         { *m = RegisterResourceRequest
 func (m *RegisterResourceRequest) String() string { return proto.CompactTextString(m) }
 func (*RegisterResourceRequest) ProtoMessage()    {}
 func (*RegisterResourceRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_resource_0e7314448ddfd7ea, []int{4}
+	return fileDescriptor_resource_a4a41d1ddbd1f936, []int{4}
 }
 func (m *RegisterResourceRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_RegisterResourceRequest.Unmarshal(m, b)
@@ -460,7 +460,7 @@ func (m *RegisterResourceRequest_PropertyDependencies) String() string {
 }
 func (*RegisterResourceRequest_PropertyDependencies) ProtoMessage() {}
 func (*RegisterResourceRequest_PropertyDependencies) Descriptor() ([]byte, []int) {
-	return fileDescriptor_resource_0e7314448ddfd7ea, []int{4, 0}
+	return fileDescriptor_resource_a4a41d1ddbd1f936, []int{4, 0}
 }
 func (m *RegisterResourceRequest_PropertyDependencies) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_RegisterResourceRequest_PropertyDependencies.Unmarshal(m, b)
@@ -503,7 +503,7 @@ func (m *RegisterResourceRequest_CustomTimeouts) Reset() {
 func (m *RegisterResourceRequest_CustomTimeouts) String() string { return proto.CompactTextString(m) }
 func (*RegisterResourceRequest_CustomTimeouts) ProtoMessage()    {}
 func (*RegisterResourceRequest_CustomTimeouts) Descriptor() ([]byte, []int) {
-	return fileDescriptor_resource_0e7314448ddfd7ea, []int{4, 1}
+	return fileDescriptor_resource_a4a41d1ddbd1f936, []int{4, 1}
 }
 func (m *RegisterResourceRequest_CustomTimeouts) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_RegisterResourceRequest_CustomTimeouts.Unmarshal(m, b)
@@ -561,7 +561,7 @@ func (m *RegisterResourceResponse) Reset()         { *m = RegisterResourceRespon
 func (m *RegisterResourceResponse) String() string { return proto.CompactTextString(m) }
 func (*RegisterResourceResponse) ProtoMessage()    {}
 func (*RegisterResourceResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_resource_0e7314448ddfd7ea, []int{5}
+	return fileDescriptor_resource_a4a41d1ddbd1f936, []int{5}
 }
 func (m *RegisterResourceResponse) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_RegisterResourceResponse.Unmarshal(m, b)
@@ -629,7 +629,7 @@ func (m *RegisterResourceOutputsRequest) Reset()         { *m = RegisterResource
 func (m *RegisterResourceOutputsRequest) String() string { return proto.CompactTextString(m) }
 func (*RegisterResourceOutputsRequest) ProtoMessage()    {}
 func (*RegisterResourceOutputsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_resource_0e7314448ddfd7ea, []int{6}
+	return fileDescriptor_resource_a4a41d1ddbd1f936, []int{6}
 }
 func (m *RegisterResourceOutputsRequest) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_RegisterResourceOutputsRequest.Unmarshal(m, b)
@@ -689,6 +689,7 @@ const _ = grpc.SupportPackageIsVersion4
 type ResourceMonitorClient interface {
 	SupportsFeature(ctx context.Context, in *SupportsFeatureRequest, opts ...grpc.CallOption) (*SupportsFeatureResponse, error)
 	Invoke(ctx context.Context, in *InvokeRequest, opts ...grpc.CallOption) (*InvokeResponse, error)
+	StreamInvoke(ctx context.Context, in *InvokeRequest, opts ...grpc.CallOption) (ResourceMonitor_StreamInvokeClient, error)
 	ReadResource(ctx context.Context, in *ReadResourceRequest, opts ...grpc.CallOption) (*ReadResourceResponse, error)
 	RegisterResource(ctx context.Context, in *RegisterResourceRequest, opts ...grpc.CallOption) (*RegisterResourceResponse, error)
 	RegisterResourceOutputs(ctx context.Context, in *RegisterResourceOutputsRequest, opts ...grpc.CallOption) (*empty.Empty, error)
@@ -720,6 +721,38 @@ func (c *resourceMonitorClient) Invoke(ctx context.Context, in *InvokeRequest, o
 	return out, nil
 }
 
+func (c *resourceMonitorClient) StreamInvoke(ctx context.Context, in *InvokeRequest, opts ...grpc.CallOption) (ResourceMonitor_StreamInvokeClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_ResourceMonitor_serviceDesc.Streams[0], c.cc, "/pulumirpc.ResourceMonitor/StreamInvoke", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &resourceMonitorStreamInvokeClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type ResourceMonitor_StreamInvokeClient interface {
+	Recv() (*InvokeResponse, error)
+	grpc.ClientStream
+}
+
+type resourceMonitorStreamInvokeClient struct {
+	grpc.ClientStream
+}
+
+func (x *resourceMonitorStreamInvokeClient) Recv() (*InvokeResponse, error) {
+	m := new(InvokeResponse)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
 func (c *resourceMonitorClient) ReadResource(ctx context.Context, in *ReadResourceRequest, opts ...grpc.CallOption) (*ReadResourceResponse, error) {
 	out := new(ReadResourceResponse)
 	err := grpc.Invoke(ctx, "/pulumirpc.ResourceMonitor/ReadResource", in, out, c.cc, opts...)
@@ -752,6 +785,7 @@ func (c *resourceMonitorClient) RegisterResourceOutputs(ctx context.Context, in
 type ResourceMonitorServer interface {
 	SupportsFeature(context.Context, *SupportsFeatureRequest) (*SupportsFeatureResponse, error)
 	Invoke(context.Context, *InvokeRequest) (*InvokeResponse, error)
+	StreamInvoke(*InvokeRequest, ResourceMonitor_StreamInvokeServer) error
 	ReadResource(context.Context, *ReadResourceRequest) (*ReadResourceResponse, error)
 	RegisterResource(context.Context, *RegisterResourceRequest) (*RegisterResourceResponse, error)
 	RegisterResourceOutputs(context.Context, *RegisterResourceOutputsRequest) (*empty.Empty, error)
@@ -797,6 +831,27 @@ func _ResourceMonitor_Invoke_Handler(srv interface{}, ctx context.Context, dec f
 	return interceptor(ctx, in, info, handler)
 }
 
+func _ResourceMonitor_StreamInvoke_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(InvokeRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(ResourceMonitorServer).StreamInvoke(m, &resourceMonitorStreamInvokeServer{stream})
+}
+
+type ResourceMonitor_StreamInvokeServer interface {
+	Send(*InvokeResponse) error
+	grpc.ServerStream
+}
+
+type resourceMonitorStreamInvokeServer struct {
+	grpc.ServerStream
+}
+
+func (x *resourceMonitorStreamInvokeServer) Send(m *InvokeResponse) error {
+	return x.ServerStream.SendMsg(m)
+}
+
 func _ResourceMonitor_ReadResource_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(ReadResourceRequest)
 	if err := dec(in); err != nil {
@@ -876,65 +931,72 @@ var _ResourceMonitor_serviceDesc = grpc.ServiceDesc{
 			Handler:    _ResourceMonitor_RegisterResourceOutputs_Handler,
 		},
 	},
-	Streams:  []grpc.StreamDesc{},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "StreamInvoke",
+			Handler:       _ResourceMonitor_StreamInvoke_Handler,
+			ServerStreams: true,
+		},
+	},
 	Metadata: "resource.proto",
 }
 
-func init() { proto.RegisterFile("resource.proto", fileDescriptor_resource_0e7314448ddfd7ea) }
+func init() { proto.RegisterFile("resource.proto", fileDescriptor_resource_a4a41d1ddbd1f936) }
 
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+	0x19, 0xbc, 0x14, 0xa9, 0xc1, 0x5d, 0xef, 0x54, 0x96, 0xc1, 0xdd, 0x59, 0x7c, 0xf7, 0x38, 0x2b,
+	0xfc, 0x3d, 0x80, 0x47, 0x1b, 0xc5, 0x65, 0x46, 0xc0, 0x15, 0x2e, 0xfd, 0x08, 0xb8, 0xc2, 0x25,
+	0x79, 0x0d, 0xf7, 0xaf, 0x59, 0x5e, 0x62, 0xd5, 0xfd, 0x4f, 0xff, 0xa7, 0x76, 0x63, 0x97, 0xe5,
+	0xd3, 0xde, 0xb3, 0x20, 0xfa, 0x2b, 0x00, 0xda, 0xde, 0xbb, 0x71, 0x08, 0xb9, 0xb7, 0xa0, 0xb7,
+	0x7a, 0x0b, 0xfe, 0xed, 0xf3, 0xfe, 0xdd, 0xfa, 0x7c, 0x02, 0x03, 0xa5, 0xd9, 0x79, 0x8e, 0x7e,
+	0x60, 0x38, 0xcb, 0x28, 0xcc, 0xad, 0xcc, 0x8b, 0x60, 0x15, 0x56, 0x99, 0x11, 0xc2, 0x51, 0xf3,
+	0x80, 0x95, 0x2c, 0xfd, 0x10, 0x6b, 0x1f, 0xf3, 0x09, 0x6c, 0xf3, 0x4a, 0xd9, 0xb7, 0x0c, 0x4a,
+	0x1f, 0x77, 0xfa, 0xc7, 0x16, 0xec, 0xf9, 0xfc, 0xaf, 0x79, 0x91, 0x69, 0x2e, 0xc9, 0x4f, 0xb0,
+	0xd7, 0x78, 0x4c, 0xc9, 0x7b, 0x6b, 0x9c, 0x77, 0x3f, 0xc9, 0x61, 0x74, 0x53, 0x88, 0x63, 0x36,
+	0xba, 0x47, 0xbe, 0x80, 0xc1, 0xab, 0xe2, 0x9a, 0x5f, 0x21, 0xa1, 0x6b, 0xf1, 0x0e, 0xf2, 0x99,
+	0x1e, 0x75, 0x78, 0x56, 0x09, 0xbe, 0x86, 0xdd, 0x33, 0x2d, 0x91, 0x2d, 0xde, 0x28, 0xcd, 0xe3,
+	0x80, 0x7c, 0x07, 0xbb, 0xeb, 0x4f, 0x10, 0x39, 0xaa, 0xc9, 0xaa, 0xf5, 0x3f, 0x10, 0xbe, 0xbb,
+	0xd1, 0xbf, 0x3a, 0xdb, 0xcf, 0xb0, 0xdf, 0xac, 0x19, 0x89, 0x6e, 0x57, 0x6b, 0xf8, 0xfe, 0x8d,
+	0x31, 0xab, 0xf4, 0xbf, 0xb4, 0x1f, 0x34, 0x3f, 0xa9, 0x3e, 0xbc, 0x21, 0x43, 0x5d, 0x36, 0xe1,
+	0xa4, 0xa5, 0x89, 0x97, 0xe6, 0x07, 0x2d, 0xba, 0x77, 0x3e, 0xb0, 0xc8, 0xc7, 0xff, 0x04, 0x00,
+	0x00, 0xff, 0xff, 0x48, 0xe1, 0x9e, 0xa4, 0xdd, 0x09, 0x00, 0x00,
 }

sdk/proto/provider.proto

@@ -33,6 +33,10 @@ service ResourceProvider {
     // Invoke dynamically executes a built-in function in the provider.
     rpc Invoke(InvokeRequest) returns (InvokeResponse) {}
 
+    // StreamInvoke dynamically executes a built-in function in the provider, which returns a stream
+    // of responses.
+    rpc StreamInvoke(InvokeRequest) returns (stream InvokeResponse) {}
+
     // Check validates that the given property bag is valid for a resource of the given type and returns the inputs
     // that should be passed to successive calls to Diff, Create, or Update for this resource. As a rule, the provider
     // inputs returned by a call to Check should preserve the original representation of the properties as present in

sdk/proto/resource.proto

@@ -24,6 +24,7 @@ package pulumirpc;
 service ResourceMonitor {
     rpc SupportsFeature(SupportsFeatureRequest) returns (SupportsFeatureResponse) {}
     rpc Invoke(InvokeRequest) returns (InvokeResponse) {}
+    rpc StreamInvoke(InvokeRequest) returns (stream InvokeResponse) {}
     rpc ReadResource(ReadResourceRequest) returns (ReadResourceResponse) {}
     rpc RegisterResource(RegisterResourceRequest) returns (RegisterResourceResponse) {}
     rpc RegisterResourceOutputs(RegisterResourceOutputsRequest) returns (google.protobuf.Empty) {}

sdk/python/lib/pulumi/runtime/proto/provider_pb2_grpc.py

@@ -37,6 +37,11 @@ class ResourceProviderStub(object):
         request_serializer=provider__pb2.InvokeRequest.SerializeToString,
         response_deserializer=provider__pb2.InvokeResponse.FromString,
         )
+    self.StreamInvoke = channel.unary_stream(
+        '/pulumirpc.ResourceProvider/StreamInvoke',
+        request_serializer=provider__pb2.InvokeRequest.SerializeToString,
+        response_deserializer=provider__pb2.InvokeResponse.FromString,
+        )
     self.Check = channel.unary_unary(
         '/pulumirpc.ResourceProvider/Check',
         request_serializer=provider__pb2.CheckRequest.SerializeToString,
@@ -112,6 +117,14 @@ class ResourceProviderServicer(object):
     context.set_details('Method not implemented!')
     raise NotImplementedError('Method not implemented!')
 
+  def StreamInvoke(self, request, context):
+    """StreamInvoke dynamically executes a built-in function in the provider, which returns a stream
+    of responses.
+    """
+    context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+    context.set_details('Method not implemented!')
+    raise NotImplementedError('Method not implemented!')
+
   def Check(self, request, context):
     """Check validates that the given property bag is valid for a resource of the given type and returns the inputs
     that should be passed to successive calls to Diff, Create, or Update for this resource. As a rule, the provider
@@ -197,6 +210,11 @@ def add_ResourceProviderServicer_to_server(servicer, server):
           request_deserializer=provider__pb2.InvokeRequest.FromString,
           response_serializer=provider__pb2.InvokeResponse.SerializeToString,
       ),
+      'StreamInvoke': grpc.unary_stream_rpc_method_handler(
+          servicer.StreamInvoke,
+          request_deserializer=provider__pb2.InvokeRequest.FromString,
+          response_serializer=provider__pb2.InvokeResponse.SerializeToString,
+      ),
       'Check': grpc.unary_unary_rpc_method_handler(
           servicer.Check,
           request_deserializer=provider__pb2.CheckRequest.FromString,

sdk/python/lib/pulumi/runtime/proto/resource_pb2.py

@@ -23,7 +23,7 @@ DESCRIPTOR = _descriptor.FileDescriptor(
   package='pulumirpc',
   syntax='proto3',
   serialized_options=None,
-  serialized_pb=_b('\n\x0eresource.proto\x12\tpulumirpc\x1a\x1bgoogle/protobuf/empty.proto\x1a\x1cgoogle/protobuf/struct.proto\x1a\x0eprovider.proto\"$\n\x16SupportsFeatureRequest\x12\n\n\x02id\x18\x01 \x01(\t\"-\n\x17SupportsFeatureResponse\x12\x12\n\nhasSupport\x18\x01 \x01(\x08\"\xfc\x01\n\x13ReadResourceRequest\x12\n\n\x02id\x18\x01 \x01(\t\x12\x0c\n\x04type\x18\x02 \x01(\t\x12\x0c\n\x04name\x18\x03 \x01(\t\x12\x0e\n\x06parent\x18\x04 \x01(\t\x12+\n\nproperties\x18\x05 \x01(\x0b\x32\x17.google.protobuf.Struct\x12\x14\n\x0c\x64\x65pendencies\x18\x06 \x03(\t\x12\x10\n\x08provider\x18\x07 \x01(\t\x12\x0f\n\x07version\x18\x08 \x01(\t\x12\x15\n\racceptSecrets\x18\t \x01(\x08\x12\x1f\n\x17\x61\x64\x64itionalSecretOutputs\x18\n \x03(\t\x12\x0f\n\x07\x61liases\x18\x0b \x03(\t\"P\n\x14ReadResourceResponse\x12\x0b\n\x03urn\x18\x01 \x01(\t\x12+\n\nproperties\x18\x02 \x01(\x0b\x32\x17.google.protobuf.Struct\"\x80\x06\n\x17RegisterResourceRequest\x12\x0c\n\x04type\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12\x0e\n\x06parent\x18\x03 \x01(\t\x12\x0e\n\x06\x63ustom\x18\x04 \x01(\x08\x12\'\n\x06object\x18\x05 \x01(\x0b\x32\x17.google.protobuf.Struct\x12\x0f\n\x07protect\x18\x06 \x01(\x08\x12\x14\n\x0c\x64\x65pendencies\x18\x07 \x03(\t\x12\x10\n\x08provider\x18\x08 \x01(\t\x12Z\n\x14propertyDependencies\x18\t \x03(\x0b\x32<.pulumirpc.RegisterResourceRequest.PropertyDependenciesEntry\x12\x1b\n\x13\x64\x65leteBeforeReplace\x18\n \x01(\x08\x12\x0f\n\x07version\x18\x0b \x01(\t\x12\x15\n\rignoreChanges\x18\x0c \x03(\t\x12\x15\n\racceptSecrets\x18\r \x01(\x08\x12\x1f\n\x17\x61\x64\x64itionalSecretOutputs\x18\x0e \x03(\t\x12\x0f\n\x07\x61liases\x18\x0f \x03(\t\x12\x10\n\x08importId\x18\x10 \x01(\t\x12I\n\x0e\x63ustomTimeouts\x18\x11 \x01(\x0b\x32\x31.pulumirpc.RegisterResourceRequest.CustomTimeouts\x12\"\n\x1a\x64\x65leteBeforeReplaceDefined\x18\x12 \x01(\x08\x1a$\n\x14PropertyDependencies\x12\x0c\n\x04urns\x18\x01 \x03(\t\x1a@\n\x0e\x43ustomTimeouts\x12\x0e\n\x06\x63reate\x18\x01 \x01(\t\x12\x0e\n\x06update\x18\x02 \x01(\t\x12\x0e\n\x06\x64\x65lete\x18\x03 \x01(\t\x1at\n\x19PropertyDependenciesEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\x46\n\x05value\x18\x02 \x01(\x0b\x32\x37.pulumirpc.RegisterResourceRequest.PropertyDependencies:\x02\x38\x01\"}\n\x18RegisterResourceResponse\x12\x0b\n\x03urn\x18\x01 \x01(\t\x12\n\n\x02id\x18\x02 \x01(\t\x12\'\n\x06object\x18\x03 \x01(\x0b\x32\x17.google.protobuf.Struct\x12\x0e\n\x06stable\x18\x04 \x01(\x08\x12\x0f\n\x07stables\x18\x05 \x03(\t\"W\n\x1eRegisterResourceOutputsRequest\x12\x0b\n\x03urn\x18\x01 \x01(\t\x12(\n\x07outputs\x18\x02 \x01(\x0b\x32\x17.google.protobuf.Struct2\xc0\x03\n\x0fResourceMonitor\x12Z\n\x0fSupportsFeature\x12!.pulumirpc.SupportsFeatureRequest\x1a\".pulumirpc.SupportsFeatureResponse\"\x00\x12?\n\x06Invoke\x12\x18.pulumirpc.InvokeRequest\x1a\x19.pulumirpc.InvokeResponse\"\x00\x12Q\n\x0cReadResource\x12\x1e.pulumirpc.ReadResourceRequest\x1a\x1f.pulumirpc.ReadResourceResponse\"\x00\x12]\n\x10RegisterResource\x12\".pulumirpc.RegisterResourceRequest\x1a#.pulumirpc.RegisterResourceResponse\"\x00\x12^\n\x17RegisterResourceOutputs\x12).pulumirpc.RegisterResourceOutputsRequest\x1a\x16.google.protobuf.Empty\"\x00\x62\x06proto3')
+  serialized_pb=_b('\n\x0eresource.proto\x12\tpulumirpc\x1a\x1bgoogle/protobuf/empty.proto\x1a\x1cgoogle/protobuf/struct.proto\x1a\x0eprovider.proto\"$\n\x16SupportsFeatureRequest\x12\n\n\x02id\x18\x01 \x01(\t\"-\n\x17SupportsFeatureResponse\x12\x12\n\nhasSupport\x18\x01 \x01(\x08\"\xfc\x01\n\x13ReadResourceRequest\x12\n\n\x02id\x18\x01 \x01(\t\x12\x0c\n\x04type\x18\x02 \x01(\t\x12\x0c\n\x04name\x18\x03 \x01(\t\x12\x0e\n\x06parent\x18\x04 \x01(\t\x12+\n\nproperties\x18\x05 \x01(\x0b\x32\x17.google.protobuf.Struct\x12\x14\n\x0c\x64\x65pendencies\x18\x06 \x03(\t\x12\x10\n\x08provider\x18\x07 \x01(\t\x12\x0f\n\x07version\x18\x08 \x01(\t\x12\x15\n\racceptSecrets\x18\t \x01(\x08\x12\x1f\n\x17\x61\x64\x64itionalSecretOutputs\x18\n \x03(\t\x12\x0f\n\x07\x61liases\x18\x0b \x03(\t\"P\n\x14ReadResourceResponse\x12\x0b\n\x03urn\x18\x01 \x01(\t\x12+\n\nproperties\x18\x02 \x01(\x0b\x32\x17.google.protobuf.Struct\"\x80\x06\n\x17RegisterResourceRequest\x12\x0c\n\x04type\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12\x0e\n\x06parent\x18\x03 \x01(\t\x12\x0e\n\x06\x63ustom\x18\x04 \x01(\x08\x12\'\n\x06object\x18\x05 \x01(\x0b\x32\x17.google.protobuf.Struct\x12\x0f\n\x07protect\x18\x06 \x01(\x08\x12\x14\n\x0c\x64\x65pendencies\x18\x07 \x03(\t\x12\x10\n\x08provider\x18\x08 \x01(\t\x12Z\n\x14propertyDependencies\x18\t \x03(\x0b\x32<.pulumirpc.RegisterResourceRequest.PropertyDependenciesEntry\x12\x1b\n\x13\x64\x65leteBeforeReplace\x18\n \x01(\x08\x12\x0f\n\x07version\x18\x0b \x01(\t\x12\x15\n\rignoreChanges\x18\x0c \x03(\t\x12\x15\n\racceptSecrets\x18\r \x01(\x08\x12\x1f\n\x17\x61\x64\x64itionalSecretOutputs\x18\x0e \x03(\t\x12\x0f\n\x07\x61liases\x18\x0f \x03(\t\x12\x10\n\x08importId\x18\x10 \x01(\t\x12I\n\x0e\x63ustomTimeouts\x18\x11 \x01(\x0b\x32\x31.pulumirpc.RegisterResourceRequest.CustomTimeouts\x12\"\n\x1a\x64\x65leteBeforeReplaceDefined\x18\x12 \x01(\x08\x1a$\n\x14PropertyDependencies\x12\x0c\n\x04urns\x18\x01 \x03(\t\x1a@\n\x0e\x43ustomTimeouts\x12\x0e\n\x06\x63reate\x18\x01 \x01(\t\x12\x0e\n\x06update\x18\x02 \x01(\t\x12\x0e\n\x06\x64\x65lete\x18\x03 \x01(\t\x1at\n\x19PropertyDependenciesEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\x46\n\x05value\x18\x02 \x01(\x0b\x32\x37.pulumirpc.RegisterResourceRequest.PropertyDependencies:\x02\x38\x01\"}\n\x18RegisterResourceResponse\x12\x0b\n\x03urn\x18\x01 \x01(\t\x12\n\n\x02id\x18\x02 \x01(\t\x12\'\n\x06object\x18\x03 \x01(\x0b\x32\x17.google.protobuf.Struct\x12\x0e\n\x06stable\x18\x04 \x01(\x08\x12\x0f\n\x07stables\x18\x05 \x03(\t\"W\n\x1eRegisterResourceOutputsRequest\x12\x0b\n\x03urn\x18\x01 \x01(\t\x12(\n\x07outputs\x18\x02 \x01(\x0b\x32\x17.google.protobuf.Struct2\x89\x04\n\x0fResourceMonitor\x12Z\n\x0fSupportsFeature\x12!.pulumirpc.SupportsFeatureRequest\x1a\".pulumirpc.SupportsFeatureResponse\"\x00\x12?\n\x06Invoke\x12\x18.pulumirpc.InvokeRequest\x1a\x19.pulumirpc.InvokeResponse\"\x00\x12G\n\x0cStreamInvoke\x12\x18.pulumirpc.InvokeRequest\x1a\x19.pulumirpc.InvokeResponse\"\x00\x30\x01\x12Q\n\x0cReadResource\x12\x1e.pulumirpc.ReadResourceRequest\x1a\x1f.pulumirpc.ReadResourceResponse\"\x00\x12]\n\x10RegisterResource\x12\".pulumirpc.RegisterResourceRequest\x1a#.pulumirpc.RegisterResourceResponse\"\x00\x12^\n\x17RegisterResourceOutputs\x12).pulumirpc.RegisterResourceOutputsRequest\x1a\x16.google.protobuf.Empty\"\x00\x62\x06proto3')
   ,
   dependencies=[google_dot_protobuf_dot_empty__pb2.DESCRIPTOR,google_dot_protobuf_dot_struct__pb2.DESCRIPTOR,provider__pb2.DESCRIPTOR,])
 
@@ -691,7 +691,7 @@ _RESOURCEMONITOR = _descriptor.ServiceDescriptor(
   index=0,
   serialized_options=None,
   serialized_start=1514,
-  serialized_end=1962,
+  serialized_end=2035,
   methods=[
   _descriptor.MethodDescriptor(
     name='SupportsFeature',
@@ -711,10 +711,19 @@ _RESOURCEMONITOR = _descriptor.ServiceDescriptor(
     output_type=provider__pb2._INVOKERESPONSE,
     serialized_options=None,
   ),
+  _descriptor.MethodDescriptor(
+    name='StreamInvoke',
+    full_name='pulumirpc.ResourceMonitor.StreamInvoke',
+    index=2,
+    containing_service=None,
+    input_type=provider__pb2._INVOKEREQUEST,
+    output_type=provider__pb2._INVOKERESPONSE,
+    serialized_options=None,
+  ),
   _descriptor.MethodDescriptor(
     name='ReadResource',
     full_name='pulumirpc.ResourceMonitor.ReadResource',
-    index=2,
+    index=3,
     containing_service=None,
     input_type=_READRESOURCEREQUEST,
     output_type=_READRESOURCERESPONSE,
@@ -723,7 +732,7 @@ _RESOURCEMONITOR = _descriptor.ServiceDescriptor(
   _descriptor.MethodDescriptor(
     name='RegisterResource',
     full_name='pulumirpc.ResourceMonitor.RegisterResource',
-    index=3,
+    index=4,
     containing_service=None,
     input_type=_REGISTERRESOURCEREQUEST,
     output_type=_REGISTERRESOURCERESPONSE,
@@ -732,7 +741,7 @@ _RESOURCEMONITOR = _descriptor.ServiceDescriptor(
   _descriptor.MethodDescriptor(
     name='RegisterResourceOutputs',
     full_name='pulumirpc.ResourceMonitor.RegisterResourceOutputs',
-    index=4,
+    index=5,
     containing_service=None,
     input_type=_REGISTERRESOURCEOUTPUTSREQUEST,
     output_type=google_dot_protobuf_dot_empty__pb2._EMPTY,

sdk/python/lib/pulumi/runtime/proto/resource_pb2_grpc.py

@@ -26,6 +26,11 @@ class ResourceMonitorStub(object):
         request_serializer=provider__pb2.InvokeRequest.SerializeToString,
         response_deserializer=provider__pb2.InvokeResponse.FromString,
         )
+    self.StreamInvoke = channel.unary_stream(
+        '/pulumirpc.ResourceMonitor/StreamInvoke',
+        request_serializer=provider__pb2.InvokeRequest.SerializeToString,
+        response_deserializer=provider__pb2.InvokeResponse.FromString,
+        )
     self.ReadResource = channel.unary_unary(
         '/pulumirpc.ResourceMonitor/ReadResource',
         request_serializer=resource__pb2.ReadResourceRequest.SerializeToString,
@@ -61,6 +66,13 @@ class ResourceMonitorServicer(object):
     context.set_details('Method not implemented!')
     raise NotImplementedError('Method not implemented!')
 
+  def StreamInvoke(self, request, context):
+    # missing associated documentation comment in .proto file
+    pass
+    context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+    context.set_details('Method not implemented!')
+    raise NotImplementedError('Method not implemented!')
+
   def ReadResource(self, request, context):
     # missing associated documentation comment in .proto file
     pass
@@ -95,6 +107,11 @@ def add_ResourceMonitorServicer_to_server(servicer, server):
           request_deserializer=provider__pb2.InvokeRequest.FromString,
           response_serializer=provider__pb2.InvokeResponse.SerializeToString,
       ),
+      'StreamInvoke': grpc.unary_stream_rpc_method_handler(
+          servicer.StreamInvoke,
+          request_deserializer=provider__pb2.InvokeRequest.FromString,
+          response_serializer=provider__pb2.InvokeResponse.SerializeToString,
+      ),
       'ReadResource': grpc.unary_unary_rpc_method_handler(
           servicer.ReadResource,
           request_deserializer=resource__pb2.ReadResourceRequest.FromString,