Update bootstrap string for certificate providers

src/core/ext/xds/certificate_provider_factory.h

@@ -39,6 +39,8 @@ class CertificateProviderFactory {
     // Name of the type of the CertificateProvider. Unique to each type of
     // config.
     virtual const char* name() const = 0;
+
+    virtual std::string ToString() const = 0;
   };
 
   virtual ~CertificateProviderFactory() = default;

src/core/ext/xds/google_mesh_ca_certificate_provider_factory.cc

@@ -164,6 +164,11 @@ const char* GoogleMeshCaCertificateProviderFactory::Config::name() const {
   return kMeshCaPlugin;
 }
 
+std::string GoogleMeshCaCertificateProviderFactory::Config::ToString() const {
+  // TODO(yashykt): To be filled
+  return "{}";
+}
+
 std::vector<grpc_error*>
 GoogleMeshCaCertificateProviderFactory::Config::ParseJsonObjectStsService(
     const Json::Object& sts_service) {

src/core/ext/xds/google_mesh_ca_certificate_provider_factory.h

@@ -46,6 +46,8 @@ class GoogleMeshCaCertificateProviderFactory
 
     const char* name() const override;
 
+    std::string ToString() const override;
+
     const std::string& endpoint() const { return endpoint_; }
 
     const StsConfig& sts_config() const { return sts_config_; }

src/core/ext/xds/xds_bootstrap.cc

@@ -116,7 +116,18 @@ std::string BootstrapString(const XdsBootstrap& bootstrap) {
         "    server_features=[",
         absl::StrJoin(bootstrap.server().server_features, ", "), "],\n"));
   }
-  parts.push_back("  }\n]");
+  parts.push_back("  }\n],\n");
+  parts.push_back("certificate_providers={\n");
+  for (const auto& entry : bootstrap.certificate_providers()) {
+    parts.push_back(
+        absl::StrFormat("  %s={\n"
+                        "    plugin_name=%s\n"
+                        "    config=%s\n"
+                        "  },\n",
+                        entry.first, entry.second.plugin_name,
+                        entry.second.config->ToString()));
+  }
+  parts.push_back("}");
   return absl::StrJoin(parts, "");
 }
 

test/core/xds/certificate_provider_store_test.cc

@@ -50,6 +50,8 @@ class FakeCertificateProviderFactory1 : public CertificateProviderFactory {
   class Config : public CertificateProviderFactory::Config {
    public:
     const char* name() const override { return "fake1"; }
+
+    std::string ToString() const override { return "{}"; }
   };
 
   const char* name() const override { return "fake1"; }
@@ -71,6 +73,8 @@ class FakeCertificateProviderFactory2 : public CertificateProviderFactory {
   class Config : public CertificateProviderFactory::Config {
    public:
     const char* name() const override { return "fake2"; }
+
+    std::string ToString() const override { return "{}"; }
   };
 
   const char* name() const override { return "fake2"; }

test/core/xds/xds_bootstrap_test.cc

@@ -17,6 +17,7 @@
 #include <regex>
 
 #include "absl/strings/numbers.h"
+#include "absl/strings/str_format.h"
 
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
@@ -433,6 +434,14 @@ class FakeCertificateProviderFactory : public CertificateProviderFactory {
 
     const char* name() const override { return "fake"; }
 
+    std::string ToString() const override {
+      return absl::StrFormat(
+          "{\n"
+          "  value=%d"
+          "}",
+          value_);
+    }
+
    private:
     int value_;
   };