Changes for integration into proxy-wasm.

.github/workflows/cpp.yml

@@ -53,7 +53,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
 
     - name: Mount bazel cache
       uses: actions/cache@v1

BUILD

@@ -22,6 +22,7 @@ cc_library(
     copts = ["-DWITHOUT_ZLIB=1"],
     deps = [
         ":include",
+        "@com_google_protobuf//:protobuf_lite",
         "@proxy_wasm_cpp_sdk//:api_lib",
     ],
 )
@@ -45,6 +46,7 @@ cc_library(
         "@com_google_absl//absl/base",
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/types:optional",
+        "@com_google_protobuf//:protobuf_lite",
         "@proxy_wasm_cpp_sdk//:api_lib",
     ],
 )

WORKSPACE

@@ -3,13 +3,10 @@ workspace(name = "proxy_wasm_cpp_host")
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
 
-http_archive(
+git_repository(
     name = "proxy_wasm_cpp_sdk",
-    sha256 = "14f66f67e8f37ec81d28d7f5307be4407d206ac5f0daaf6d22fa5536797bcac1",
-    strip_prefix = "proxy-wasm-cpp-sdk-31f1fc5b7e09f231fa532d2d296e479a113c3e10",
-    urls = ["https://github.com/proxy-wasm/proxy-wasm-cpp-sdk/archive/31f1fc5b7e09f231fa532d2d296e479a113c3e10.tar.gz"],
-    patch_cmds = ["rm BUILD"],
-    build_file = '//bazel/external:proxy-wasm-cpp-sdk.BUILD',
+    remote = "https://github.com/proxy-wasm/proxy-wasm-cpp-sdk",
+    commit = "c12553951d01bb60cb1448ba1fcfeb8f843aad62",
 )
 
 http_archive(
@@ -20,7 +17,6 @@ http_archive(
     urls = ["https://github.com/abseil/abseil-cpp/archive/37dd2562ec830d547a1524bb306be313ac3f2556.tar.gz"],
 )
 
-
 # required by com_google_protobuf
 http_archive(
     name = "bazel_skylib",

include/proxy-wasm/context.h

@@ -36,7 +36,6 @@ class WasmVm;
 
 using Pairs = std::vector<std::pair<string_view, string_view>>;
 using PairsWithStringValues = std::vector<std::pair<string_view, std::string>>;
-using CallOnThreadFunction = std::function<void(std::function<void()>)>;
 
 struct BufferInterface {
   virtual ~BufferInterface() {}
@@ -50,9 +49,12 @@ struct BufferInterface {
    * @param size_ptr is the location in the VM address space to place the size of the newly
    * allocated memory block which contains the copied bytes (e.g. length).
    * @return true on success.
+   * Length is guarantteed to be > 0 and the bounds have already been checked.
    */
-  virtual bool copyTo(WasmBase *wasm, size_t start, size_t length, uint64_t ptr_ptr,
-                      uint64_t size_ptr) const = 0;
+  virtual WasmResult copyTo(WasmBase *wasm, size_t start, size_t length, uint64_t ptr_ptr,
+                            uint64_t size_ptr) const = 0;
+
+  virtual WasmResult copyFrom(size_t start, size_t length, string_view data) = 0;
 };
 
 // Opaque context object.
@@ -94,7 +96,7 @@ class ContextBase {
   uint32_t id() const { return id_; }
   bool isVmContext() const { return id_ == 0; }
   bool isRootContext() const { return root_context_id_ == 0; }
-  ContextBase *root_context() { return root_context_; }
+  ContextBase *root_context() const { return root_context_; }
   string_view root_id() const { return isRootContext() ? root_id_ : plugin_->root_id_; }
   string_view log_prefix() const {
     return isRootContext() ? root_log_prefix_ : plugin_->log_prefix();
@@ -104,76 +106,50 @@ class ContextBase {
   // Called before deleting the context.
   virtual void destroy();
 
-  //
   // VM level downcalls into the WASM code on Context(id == 0).
-  //
   virtual bool onStart(std::shared_ptr<PluginBase> plugin);
   virtual bool onConfigure(std::shared_ptr<PluginBase> plugin);
 
-  //
+  // Root Context downcalls into the WASM code Context(id != 0, root_context_id_ == 0);
+  virtual void onTick();
+
   // Stream downcalls on Context(id > 0).
   //
   // General stream downcall on a new stream.
   virtual void onCreate(uint32_t root_context_id);
+
   // Network
-  virtual FilterStatus onNetworkNewConnection() {
-    unimplemented();
-    return FilterStatus::Continue;
-  }
-  virtual FilterStatus onDownstreamData(int /* data_length */, bool /* end_of_stream */) {
-    unimplemented();
-    return FilterStatus::Continue;
-  }
-  virtual FilterStatus onUpstreamData(int /* data_length */, bool /* end_of_stream */) {
-    unimplemented();
-    return FilterStatus::Continue;
-  }
+  virtual FilterStatus onNetworkNewConnection();
+  virtual FilterStatus onDownstreamData(int data_length, bool end_of_stream);
+  virtual FilterStatus onUpstreamData(int data_length, bool end_of_stream);
   enum class PeerType : uint32_t {
     Unknown = 0,
     Local = 1,
     Remote = 2,
   };
-  virtual void onDownstreamConnectionClose(PeerType) { unimplemented(); }
-  virtual void onUpstreamConnectionClose(PeerType) { unimplemented(); }
+  virtual void onDownstreamConnectionClose(PeerType);
+  virtual void onUpstreamConnectionClose(PeerType);
   // HTTP Filter Stream Request Downcalls.
-  virtual FilterHeadersStatus onRequestHeaders() {
-    unimplemented();
-    return FilterHeadersStatus::Continue;
-  }
-  virtual FilterDataStatus onRequestBody(int /* body_buffer_length */, bool /* end_of_stream */) {
-    unimplemented();
-    return FilterDataStatus::Continue;
-  }
-  virtual FilterTrailersStatus onRequestTrailers() {
-    unimplemented();
-    return FilterTrailersStatus::Continue;
-  }
-  virtual FilterMetadataStatus onRequestMetadata() {
-    unimplemented();
-    return FilterMetadataStatus::Continue;
-  }
+  virtual FilterHeadersStatus onRequestHeaders(uint32_t headers);
+  virtual FilterDataStatus onRequestBody(uint32_t body_buffer_length, bool end_of_stream);
+  virtual FilterTrailersStatus onRequestTrailers(uint32_t trailers);
+  virtual FilterMetadataStatus onRequestMetadata(uint32_t elements);
   // HTTP Filter Stream Response Downcalls.
-  virtual FilterHeadersStatus onResponseHeaders() {
-    unimplemented();
-    return FilterHeadersStatus::Continue;
-  }
-  virtual FilterDataStatus onResponseBody(int /* body_buffer_length */, bool /* end_of_stream */) {
-    unimplemented();
-    return FilterDataStatus::Continue;
-  }
-  virtual FilterTrailersStatus onResponseTrailers() {
-    unimplemented();
-    return FilterTrailersStatus::Continue;
-  }
-  virtual FilterMetadataStatus onResponseMetadata() {
-    unimplemented();
-    return FilterMetadataStatus::Continue;
-  }
+  virtual FilterHeadersStatus onResponseHeaders(uint32_t headers);
+  virtual FilterDataStatus onResponseBody(uint32_t body_buffer_length, bool end_of_stream);
+  virtual FilterTrailersStatus onResponseTrailers(uint32_t trailers);
+  virtual FilterMetadataStatus onResponseMetadata(uint32_t elements);
   // Async call response.
-  virtual void onHttpCallResponse(uint32_t /* token */, uint32_t /* headers */,
-                                  uint32_t /* body_size */, uint32_t /* trailers */) {}
+  virtual void onHttpCallResponse(uint32_t token, uint32_t headers, uint32_t body_size,
+                                  uint32_t trailers);
+  // Grpc
+  virtual void onGrpcReceiveInitialMetadata(uint32_t token, uint32_t elements);
+  virtual void onGrpcReceiveTrailingMetadata(uint32_t token, uint32_t trailers);
+  virtual void onGrpcReceive(uint32_t token, uint32_t response_size);
+  virtual void onGrpcClose(uint32_t token, uint32_t status_code);
+
   // Inter-VM shared queue message arrival.
-  virtual void onQueueReady(uint32_t /* token */) { unimplemented(); }
+  virtual void onQueueReady(uint32_t /* token */);
   // General stream downcall when the stream/vm has ended.
   virtual bool onDone();
   // General stream downcall for logging. Occurs after onDone().
@@ -212,7 +188,7 @@ class ContextBase {
   }
 
   // Buffer
-  virtual const BufferInterface *getBuffer(WasmBufferType /* type */) {
+  virtual BufferInterface *getBuffer(WasmBufferType /* type */) {
     unimplemented();
     return nullptr;
   }
@@ -233,14 +209,16 @@ class ContextBase {
   // gRPC
   // Returns a token which will be used with the corresponding onGrpc and grpc calls.
   virtual WasmResult grpcCall(string_view /* grpc_service */, string_view /* service_name */,
-                              string_view /* method_name */, string_view /* request */,
+                              string_view /* method_name */, const Pairs & /* initial_metadata */,
+                              string_view /* request */,
                               const optional<std::chrono::milliseconds> & /* timeout */,
                               uint32_t * /* token_ptr */) {
     unimplemented();
     return WasmResult::Unimplemented;
   }
   virtual WasmResult grpcStream(string_view /* grpc_service */, string_view /* service_name */,
-                                string_view /* method_name */, uint32_t * /* token_ptr */) {
+                                string_view /* method_name */, const Pairs & /* initial_metadata */,
+                                uint32_t * /* token_ptr */) {
     unimplemented();
     return WasmResult::Unimplemented;
   }
@@ -342,7 +320,12 @@ class ContextBase {
 protected:
   friend class WasmBase;
 
-  virtual void initializeRoot(WasmBase *wasm, std::shared_ptr<PluginBase> plugin);
+  // NB: initializeRootBase is non-virtual and can be called in the constructor without ambiguity.
+  void initializeRootBase(WasmBase *wasm, std::shared_ptr<PluginBase> plugin);
+  // NB: initializeRoot is virtual and should be called only outside of the constructor.
+  virtual void initializeRoot(WasmBase *wasm, std::shared_ptr<PluginBase> plugin) {
+    initializeRootBase(wasm, plugin);
+  }
   std::string makeRootLogPrefix(string_view vm_id) const;
 
   WasmBase *wasm_{nullptr};

include/proxy-wasm/exports.h

@@ -48,6 +48,8 @@ Word enqueue_shared_queue(void *raw_context, Word token, Word data_ptr, Word dat
 Word get_buffer_bytes(void *raw_context, Word type, Word start, Word length, Word ptr_ptr,
                       Word size_ptr);
 Word get_buffer_status(void *raw_context, Word type, Word length_ptr, Word flags_ptr);
+Word set_buffer_bytes(void *raw_context, Word type, Word start, Word length, Word data_ptr,
+                      Word data_size);
 Word add_header_map_value(void *raw_context, Word type, Word key_ptr, Word key_size, Word value_ptr,
                           Word value_size);
 Word get_header_map_value(void *raw_context, Word type, Word key_ptr, Word key_size,
@@ -72,10 +74,11 @@ Word record_metric(void *raw_context, Word metric_id, uint64_t value);
 Word get_metric(void *raw_context, Word metric_id, Word result_uint64_ptr);
 Word grpc_call(void *raw_context, Word service_ptr, Word service_size, Word service_name_ptr,
                Word service_name_size, Word method_name_ptr, Word method_name_size,
-               Word request_ptr, Word request_size, Word timeout_milliseconds, Word token_ptr);
+               Word initial_metadata_ptr, Word initial_metadata_size, Word request_ptr,
+               Word request_size, Word timeout_milliseconds, Word token_ptr);
 Word grpc_stream(void *raw_context, Word service_ptr, Word service_size, Word service_name_ptr,
                  Word service_name_size, Word method_name_ptr, Word method_name_size,
-                 Word token_ptr);
+                 Word initial_metadata_ptr, Word initial_metadata_size, Word token_ptr);
 Word grpc_cancel(void *raw_context, Word token);
 Word grpc_close(void *raw_context, Word token);
 Word grpc_send(void *raw_context, Word token, Word message_ptr, Word message_size, Word end_stream);
@@ -92,8 +95,10 @@ Word call_foreign_function(void *raw_context, Word function_name, Word function_
 
 Word wasi_unstable_fd_write(void *raw_context, Word fd, Word iovs, Word iovs_len,
                             Word nwritten_ptr);
+Word wasi_unstable_fd_read(void *, Word, Word, Word, Word);
 Word wasi_unstable_fd_seek(void *, Word, int64_t, Word, Word);
 Word wasi_unstable_fd_close(void *, Word);
+Word wasi_unstable_fd_fdstat_get(void *, Word fd, Word statOut);
 Word wasi_unstable_environ_get(void *, Word, Word);
 Word wasi_unstable_environ_sizes_get(void *raw_context, Word count_ptr, Word buf_size_ptr);
 Word wasi_unstable_args_get(void *raw_context, Word argc_ptr, Word argv_buf_size_ptr);

include/proxy-wasm/null_plugin.h

@@ -99,7 +99,6 @@ class NullPlugin : public NullVmPlugin {
 
   void onGrpcReceive(uint64_t context_id, uint64_t token, size_t body_size);
   void onGrpcClose(uint64_t context_id, uint64_t token, uint64_t status_code);
-  void onGrpcCreateInitialMetadata(uint64_t context_id, uint64_t token, uint64_t headers);
   void onGrpcReceiveInitialMetadata(uint64_t context_id, uint64_t token, uint64_t headers);
   void onGrpcReceiveTrailingMetadata(uint64_t context_id, uint64_t token, uint64_t trailers);
 

include/proxy-wasm/wasm.h

@@ -34,19 +34,21 @@ namespace proxy_wasm {
 
 #include "proxy_wasm_common.h"
 
+class ContextBase;
 class WasmBase;
-class WasmHandle;
+class WasmHandleBase;
 
 using WasmForeignFunction =
     std::function<WasmResult(WasmBase &, string_view, std::function<void *(size_t size)>)>;
 using WasmVmFactory = std::function<std::unique_ptr<WasmVm>()>;
+using CallOnThreadFunction = std::function<void(std::function<void()>)>;
 
 // Wasm execution instance. Manages the host side of the Wasm interface.
 class WasmBase : public std::enable_shared_from_this<WasmBase> {
 public:
   WasmBase(std::unique_ptr<WasmVm> wasm_vm, string_view vm_id, string_view vm_configuration,
            string_view vm_key);
-  WasmBase(const std::shared_ptr<WasmHandle> &other, WasmVmFactory factory);
+  WasmBase(const std::shared_ptr<WasmHandleBase> &other, WasmVmFactory factory);
   virtual ~WasmBase();
 
   bool initialize(const std::string &code, bool allow_precompiled = false);
@@ -78,11 +80,17 @@ class WasmBase : public std::enable_shared_from_this<WasmBase> {
     unimplemented();
     return nullptr;
   }
+  // NB: if plugin is nullptr, then a VM Context is returned.
+  virtual ContextBase *createContext(std::shared_ptr<PluginBase> plugin) {
+    if (plugin)
+      return new ContextBase(this, plugin);
+    return new ContextBase(this);
+  }
 
-  void setTickPeriod(uint32_t /* root_context_id */, std::chrono::milliseconds /* tick_period */) {
-    unimplemented();
+  virtual void setTickPeriod(uint32_t root_context_id, std::chrono::milliseconds tick_period) {
+    tick_period_[root_context_id] = tick_period;
   }
-  void tickHandler(uint32_t /* root_context_idl */) { unimplemented(); }
+  void tick(uint32_t root_context_id);
   void queueReady(uint32_t root_context_id, uint32_t token);
 
   void startShutdown();
@@ -216,7 +224,7 @@ class WasmBase : public std::enable_shared_from_this<WasmBase> {
   WasmCallVoid<1> on_log_;
   WasmCallVoid<1> on_delete_;
 
-  std::shared_ptr<WasmHandle> base_wasm_handle_;
+  std::shared_ptr<WasmHandleBase> base_wasm_handle_;
 
   // Used by the base_wasm to enable non-clonable thread local Wasm(s) to be constructed.
   std::string code_;
@@ -235,43 +243,40 @@ class WasmBase : public std::enable_shared_from_this<WasmBase> {
   uint32_t next_gauge_metric_id_ = static_cast<uint32_t>(MetricType::Gauge);
   uint32_t next_histogram_metric_id_ = static_cast<uint32_t>(MetricType::Histogram);
 
-  // Foreign Functions.
-  std::unordered_map<std::string, WasmForeignFunction> foreign_functions_;
-
   // Actions to be done after the call into the VM returns.
   std::deque<std::function<void()>> after_vm_call_actions_;
 };
 
 // Handle which enables shutdown operations to run post deletion (e.g. post listener drain).
-class WasmHandle : public std::enable_shared_from_this<WasmHandle> {
+class WasmHandleBase : public std::enable_shared_from_this<WasmHandleBase> {
 public:
-  explicit WasmHandle(std::shared_ptr<WasmBase> wasm) : wasm_(wasm) {}
-  ~WasmHandle() { wasm_->startShutdown(); }
+  explicit WasmHandleBase(std::shared_ptr<WasmBase> wasm_base) : wasm_base_(wasm_base) {}
+  ~WasmHandleBase() { wasm_base_->startShutdown(); }
 
-  std::shared_ptr<WasmBase> &wasm() { return wasm_; }
+  std::shared_ptr<WasmBase> &wasm() { return wasm_base_; }
 
-private:
-  std::shared_ptr<WasmBase> wasm_;
+protected:
+  std::shared_ptr<WasmBase> wasm_base_;
 };
 
 std::string makeVmKey(string_view vm_id, string_view configuration, string_view code);
 
-using WasmHandleFactory = std::function<std::shared_ptr<WasmHandle>(string_view vm_id)>;
+using WasmHandleFactory = std::function<std::shared_ptr<WasmHandleBase>(string_view vm_id)>;
 using WasmHandleCloneFactory =
-    std::function<std::shared_ptr<WasmHandle>(std::shared_ptr<WasmHandle> wasm)>;
+    std::function<std::shared_ptr<WasmHandleBase>(std::shared_ptr<WasmHandleBase> wasm)>;
 
 // Returns nullptr on failure (i.e. initialization of the VM fails).
-std::shared_ptr<WasmHandle>
+std::shared_ptr<WasmHandleBase>
 createWasm(std::string vm_key, std::string code, std::shared_ptr<PluginBase> plugin,
            WasmHandleFactory factory, bool allow_precompiled,
            std::unique_ptr<ContextBase> root_context_for_testing = nullptr);
 // Get an existing ThreadLocal VM matching 'vm_id' or nullptr if there isn't one.
-std::shared_ptr<WasmHandle> getThreadLocalWasm(string_view vm_id);
+std::shared_ptr<WasmHandleBase> getThreadLocalWasm(string_view vm_id);
 // Get an existing ThreadLocal VM matching 'vm_id' or create one using 'base_wavm' by cloning or by
 // using it it as a template.
-std::shared_ptr<WasmHandle> getOrCreateThreadLocalWasm(std::shared_ptr<WasmHandle> &base_wasm,
-                                                       std::shared_ptr<PluginBase> plugin,
-                                                       WasmHandleCloneFactory factory);
+std::shared_ptr<WasmHandleBase>
+getOrCreateThreadLocalWasm(std::shared_ptr<WasmHandleBase> base_wasm,
+                           std::shared_ptr<PluginBase> plugin, WasmHandleCloneFactory factory);
 
 inline const std::string &WasmBase::vm_configuration() const {
   if (base_wasm_handle_)