Update with respect to review branches.

.bazelrc

@@ -0,0 +1 @@
+build --cxxopt="-std=c++17"

.clang-format

@@ -0,0 +1,16 @@
+---
+Language: Cpp
+ColumnLimit: 100
+AccessModifierOffset: -2
+DerivePointerAlignment: false
+PointerAlignment: Right
+SortIncludes: false
+...
+
+---
+Language: Proto
+ColumnLimit: 100
+AllowShortFunctionsOnASingleLine: false
+ReflowComments: false
+SpacesInContainerLiterals: false
+...

BUILD

@@ -5,50 +5,76 @@ package(default_visibility = ["//visibility:public"])
 cc_library(
     name = "include",
     hdrs = [
-        "include/proxy-wasm/context.h",
         "include/proxy-wasm/compat.h",
-        "include/proxy-wasm/exports.h",
-        "include/proxy-wasm/null.h",
-        "include/proxy-wasm/null_plugin.h",
-        "include/proxy-wasm/null_vm.h",
-        "include/proxy-wasm/null_vm_plugin.h",
-        "include/proxy-wasm/v8.h",
-        "include/proxy-wasm/wasm.h",
+        "include/proxy-wasm/context.h",
         "include/proxy-wasm/wasm_vm.h",
-        "include/proxy-wasm/wasm_api_impl.h",
         "include/proxy-wasm/word.h",
     ],
-    copts = ["-std=c++14"],
     deps = [
         "@proxy_wasm_cpp_sdk//:common_lib",
     ],
 )
 
+# TODO: remove when dependent projects have been upgraded.
 cc_library(
-    name = "lib",
-    srcs = [
-        "src/exports.cc",
-        "src/foreign.cc",
-        "src/context.cc",
-        "src/wasm.cc",
-        "src/base64.cc",
-        "src/base64.h",
-        "src/v8/v8.cc",
-        "src/null/null.cc",
-        "src/null/null_plugin.cc",
-        "src/null/null_vm.cc",
+    name = "include14",
+    hdrs = [
+        "include/proxy-wasm/compat.h",
+        "include/proxy-wasm/context.h",
+        "include/proxy-wasm/wasm_vm.h",
+        "include/proxy-wasm/word.h",
     ],
-    copts = ["-std=c++14"],
     deps = [
-        ":include",
-        "@proxy_wasm_cpp_sdk//:api_lib",
         "@proxy_wasm_cpp_sdk//:common_lib",
-        "@envoy//external:abseil_flat_hash_map",
-        "@envoy//external:abseil_strings",
-        "@envoy//external:abseil_optional",
-        "@envoy//external:zlib",
-        "@boringssl//:ssl",
-        "@envoy//external:wee8",
-        "@envoy//external:protobuf",
+    ],
+)
+
+cc_test(
+    name = "wasm_vm_test",
+    srcs = ["wasm_vm_test.cc"],
+    copts = ["-std=c++17"],
+    deps = [
+        ":include",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "context_test",
+    srcs = ["context_test.cc"],
+    deps = [
+        ":include",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+# TODO: remove when dependent projects have been upgraded.
+cc_test(
+    name = "wasm_vm_14_test",
+    srcs = ["wasm_vm_test.cc"],
+    copts = ["-std=c++14"],
+    deps = [
+        ":include14",
+        "@com_google_absl//absl/base",
+        "@com_google_absl//absl/strings:strings",
+        "@com_google_absl//absl/types:optional",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "context_14_test",
+    srcs = ["context_test.cc"],
+    copts = ["-std=c++14"],
+    deps = [
+        ":include14",
+        "@com_google_absl//absl/base",
+        "@com_google_absl//absl/strings:strings",
+        "@com_google_absl//absl/types:optional",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
     ],
 )

WORKSPACE

@@ -1 +1,25 @@
 workspace(name = "proxy_wasm_cpp_host")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    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"],
+)
+
+http_archive(
+    name = "com_google_absl",
+    sha256 = "19391fb4882601a65cb648d638c11aa301ce5f525ef02da1a9eafd22f72d7c59",
+    strip_prefix = "abseil-cpp-37dd2562ec830d547a1524bb306be313ac3f2556",
+    # 2020-01-29
+    urls = ["https://github.com/abseil/abseil-cpp/archive/37dd2562ec830d547a1524bb306be313ac3f2556.tar.gz"],
+)
+
+http_archive(
+    name = "com_google_googletest",
+    sha256 = "9dc9157a9a1551ec7a7e43daea9a694a0bb5fb8bec81235d8a1e6ef64c716dcb",
+    strip_prefix = "googletest-release-1.10.0",
+    urls = ["https://github.com/google/googletest/archive/release-1.10.0.tar.gz"],
+)

context_test.cc

@@ -0,0 +1,20 @@
+#include "include/proxy-wasm/context.h"
+
+#include "gtest/gtest.h"
+
+namespace proxy_wasm {
+namespace {
+
+class Context : public ContextBase {
+public:
+  Context(std::function<void(string_view s)> error_function) : error_function_(error_function) {}
+  void error(string_view message) { error_function_(message); }
+
+private:
+  std::function<void(string_view s)> error_function_;
+};
+
+TEST(Context, IncludeParses) {}
+
+} // namespace
+} // namespace proxy_wasm

include/proxy-wasm/compat.h

@@ -14,28 +14,33 @@
 
 #pragma once
 
-// #ifdef PROXY_WASM_USE_ABSL
-#ifndef __cpp_lib_optional
-#include "absl/types/optional.h"
-#include "absl/strings/string_view.h"
-#else
+// Provide compatibiliby for projects which have not yet moved to C++17.
+// TODO: remove this when all dependent projects have upgraded.
+
+#if __cplusplus >= 201703L
 #include <optional>
 #include <string_view>
+#else
+#include "absl/types/optional.h"
+#include "absl/strings/string_view.h"
 #endif
 
 namespace proxy_wasm {
-// #ifdef PROXY_WASM_USE_ABSL
 #ifndef __cpp_lib_optional
-using string_view = absl::string_view;
 template <typename T> using optional = absl::optional<T>;
 // Only available in C++17
 // inline constexpr absl::nullopt_t nullopt = absl::nullopt;
 #define PROXY_WASM_NULLOPT absl::nullopt
 #else
-using string_view = std::string_view;
 template <typename T> using optional = std::optional<T>;
 // Only available in C++17
 // inline constexpr std::nullopt_t nullopt = std::nullopt;
 #define PROXY_WASM_NULLOPT std::nullopt
 #endif
+
+#ifndef __cpp_lib_string_view
+using string_view = absl::string_view;
+#else
+using string_view = std::string_view;
+#endif
 } // namespace proxy_wasm

include/proxy-wasm/context.h

@@ -19,6 +19,8 @@
 
 #include <time.h>
 #include <atomic>
+#include <chrono>
+#include <functional>
 #include <iostream>
 #include <map>
 #include <memory>
@@ -39,7 +41,16 @@ using CallOnThreadFunction = std::function<void(std::function<void()>)>;
 struct BufferInterface {
   virtual ~BufferInterface() {}
   virtual size_t size() const = 0;
-  // Returns true on success.
+  /**
+   * Copy bytes from the buffer into the Wasm VM corresponding to 'wasm'.
+   * @param start is the first buffer byte to copy.
+   * @param length is the length of sequence of buffer bytes to copy.
+   * @param ptr_ptr is the location in the VM address space to place the address of the newly
+   * allocated memory block which contains the copied bytes.
+   * @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.
+   */
   virtual bool copyTo(WasmBase *wasm, size_t start, size_t length, uint64_t ptr_ptr,
                       uint64_t size_ptr) const = 0;
 };

include/proxy-wasm/wasm_vm.h

@@ -17,6 +17,7 @@
 
 #include "include/proxy-wasm/compat.h"
 
+#include <functional>
 #include <memory>
 
 #include "include/proxy-wasm/word.h"

include/proxy-wasm/word.h

@@ -24,6 +24,7 @@ namespace proxy_wasm {
 struct Word {
   Word(uint64_t w) : u64_(w) {} // Implicit conversion into Word.
   uint32_t u32() const { return static_cast<uint32_t>(u64_); }
+  operator uint64_t() const { return u64_; }
   uint64_t u64_;
 };
 

wasm_vm_test.cc

@@ -0,0 +1,31 @@
+#include "include/proxy-wasm/wasm_vm.h"
+
+#include "gtest/gtest.h"
+
+namespace proxy_wasm {
+namespace {
+
+TEST(WasmVm, Compat) {
+  string_view foo = "foo";
+  std::string bar = "bar";
+
+  EXPECT_NE(foo, bar);
+  EXPECT_EQ(foo, "foo");
+
+  optional<int> o = PROXY_WASM_NULLOPT;
+  EXPECT_FALSE(o);
+
+  o = 1;
+  EXPECT_TRUE(o);
+}
+
+TEST(WasmVm, Word) {
+  Word w(1);
+  EXPECT_EQ(w.u32(), 1);
+  EXPECT_EQ(sizeof(w.u32()), sizeof(uint32_t));
+  EXPECT_EQ(w, 1);
+  EXPECT_EQ(sizeof(w), sizeof(uint64_t));
+}
+
+} // namespace
+} // namespace proxy_wasm