Remove default implementations from headers. (proxy-wasm#273)

Signed-off-by: chaoqin-li1123 <[email protected]>

Author: chaoqin-li1123

include/proxy-wasm/context.h

@@ -237,12 +237,17 @@ class ContextBase : public RootInterface,
   WasmResult log(uint32_t /* level */, std::string_view /* message */) override {
     return unimplemented();
   }
-  uint32_t getLogLevel() override { return static_cast<uint32_t>(LogLevel::info); }
+  uint32_t getLogLevel() override {
+    unimplemented();
+    return 0;
+  }
   uint64_t getCurrentTimeNanoseconds() override {
-    return std::chrono::system_clock::now().time_since_epoch().count();
+    unimplemented();
+    return 0;
   }
   uint64_t getMonotonicTimeNanoseconds() override {
-    return std::chrono::steady_clock::now().time_since_epoch().count();
+    unimplemented();
+    return 0;
   }
   std::string_view getConfiguration() override {
     unimplemented();

test/utility.h

@@ -98,6 +98,17 @@ class TestContext : public ContextBase {
 
   bool isLogged(std::string_view message) { return log_.find(message) != std::string::npos; }
 
+  uint64_t getCurrentTimeNanoseconds() override {
+    return std::chrono::duration_cast<std::chrono::nanoseconds>(
+               std::chrono::system_clock::now().time_since_epoch())
+        .count();
+  }
+  uint64_t getMonotonicTimeNanoseconds() override {
+    return std::chrono::duration_cast<std::chrono::nanoseconds>(
+               std::chrono::steady_clock::now().time_since_epoch())
+        .count();
+  }
+
 private:
   std::string log_;
 };