Re-add protobuf dependency.

This was incorrectly removed in #170, but it's needed by NullVM plugins
that make gRPC calls (built with -DPROXY_WASM_PROTOBUF).

Signed-off-by: Piotr Sikora <[email protected]>

Author: PiotrSikora

BUILD

@@ -79,6 +79,7 @@ cc_library(
     defines = ["PROXY_WASM_HAS_RUNTIME_NULL"],
     deps = [
         ":headers",
+        "@com_google_protobuf//:protobuf_lite",
         "@proxy_wasm_cpp_sdk//:api_lib",
     ],
 )

bazel/repositories.bzl

@@ -17,9 +17,9 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 def proxy_wasm_cpp_host_repositories():
     http_archive(
         name = "proxy_wasm_cpp_sdk",
-        sha256 = "489768fb95ede507543ee5982610b541a2c5b57216695a9e5c2eb8c83c9d20a3",
-        strip_prefix = "proxy-wasm-cpp-sdk-9af5ac0145a8790f62ca501c43f6fa1ea24d2d93",
-        urls = ["https://github.com/proxy-wasm/proxy-wasm-cpp-sdk/archive/9af5ac0145a8790f62ca501c43f6fa1ea24d2d93.tar.gz"],
+        sha256 = "fb62d0db7a5e94b2bf0bfab72bb967b1d4549d75be81a457dad48d4a22430947",
+        strip_prefix = "proxy-wasm-cpp-sdk-7bf94c86800773ee762be09fb84dcc2972da0b37",
+        urls = ["https://github.com/proxy-wasm/proxy-wasm-cpp-sdk/archive/7bf94c86800773ee762be09fb84dcc2972da0b37.tar.gz"],
     )
 
     http_archive(
@@ -77,6 +77,13 @@ def proxy_wasm_cpp_host_repositories():
         url = "https://github.com/bazelbuild/rules_rust/archive/96d5118f03411f80182fd45426e259eedf809d7a.tar.gz",
     )
 
+    http_archive(
+        name = "com_google_protobuf",
+        sha256 = "77ad26d3f65222fd96ccc18b055632b0bfedf295cb748b712a98ba1ac0b704b2",
+        strip_prefix = "protobuf-3.17.3",
+        url = "https://github.com/protocolbuffers/protobuf/releases/download/v3.17.3/protobuf-all-3.17.3.tar.gz",
+    )
+
     http_archive(
         name = "rules_foreign_cc",
         sha256 = "d54742ffbdc6924f222d2179f0e10e911c5c659c4ae74158e9fe827aad862ac6",

include/proxy-wasm/wasm_api_impl.h

@@ -17,6 +17,10 @@
 
 // Required by "proxy_wasm_api.h" included within null_plugin namespace.
 
+#ifdef PROXY_WASM_PROTOBUF
+#include "google/protobuf/message_lite.h"
+#endif
+
 #include <cstring>
 #include <functional>
 #include <memory>