Remove GrpcService, define REST api based objects

.gitignore

@@ -1,9 +1,16 @@
 .protoc-version
 .idea/*
-build/*
+*.ipr
+*.iws
+.settings/*
+.project
 .gradle/*
 gradle/*
 gradlew*
-*.ipr
-*.iws
+build/*
+app/build/*
+app/bin/*
+app/.classpath
+app/.project
+app/.settings
 

README.md

@@ -1,2 +1,2 @@
-# ess-server
-Encrypted Storage Service
+# vss-server
+Versioned Storage Service

build.gradle → app/build.gradle

@@ -1,15 +1,15 @@
 buildscript {
     ext.gradleVersion = '7.5.1'
     ext.protobufPlugInVersion = '0.8.12'
-    ext.protobufVersion = '3.21.6'
-    ext.grpcVersion = '1.49.1'
-
-    ext.junitVersion = '5.8.1'
+    ext.protobufVersion = '3.21.7'
+    ext.jerseyVersion = '3.1.0'
+    ext.junitVersion = '5.9.0'
 }
 
 plugins {
     id 'java'
     id 'com.google.protobuf' version "${protobufPlugInVersion}"
+    id 'war'
     id 'idea'
 }
 
@@ -23,21 +23,12 @@ idea {
     }
 }
 
-group 'org.ess'
-version '1.0-SNAPSHOT'
+group 'org.vss'
+version '1.0'
 
-wrapper {
-    gradleVersion = "$gradleVersion"
-}
 
 dependencies {
-    // grpc and protobuf
     implementation "com.google.protobuf:protobuf-java:$protobufVersion"
-    implementation "io.grpc:grpc-protobuf:$grpcVersion"
-    implementation "io.grpc:grpc-stub:$grpcVersion"
-    implementation "io.grpc:grpc-netty-shaded:$grpcVersion"
-    implementation "org.apache.tomcat:annotations-api:6.0.53" //Required for Java9+
-
 
     testImplementation "org.junit.jupiter:junit-jupiter-api:$junitVersion"
     testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion"

src/main/proto/ess.proto → app/src/main/proto/vss.proto

@@ -1,12 +1,6 @@
 syntax = "proto3";
 option java_multiple_files = true;
-package org.ess;
-
-service EncryptedStorageService {
-  rpc get(GetObjectRequest) returns (GetObjectResponse);
-  rpc put(PutObjectRequest) returns (PutObjectResponse);
-  //TODO: Add getKeysSummary (Gives version numbers for all keys in a store) and list by prefix APIs
-}
+package org.vss;
 
 message GetObjectRequest {
   /*
@@ -19,11 +13,7 @@ message GetObjectRequest {
   string key = 2;
 }
 message GetObjectResponse {
-  bool success = 1;
   KeyValue value = 2;
-
-  // Optional, only present when success = false
-  optional ErrorResponse errorResponse = 3;
 }
 
 message PutObjectRequest {
@@ -55,24 +45,32 @@ message PutObjectRequest {
 }
 
 message PutObjectResponse {
-  bool success = 1;
-  optional ErrorResponse errorResponse = 2;
 }
 
+/*
+  When HttpStatusCode is not ok(200), response `content` contains serialized ErrorResponse.
+ */
 message ErrorResponse{
   ErrorCode errorCode = 1;
   string message = 2;
 }
+/*
+  ErrorCodes along with corresponding HttpStatusCodes used in response
+ */
 enum ErrorCode{
   Unknown = 0;
-  ConflictException = 2;
-  InvalidRequestException = 3;
-  InternalServerException = 4;
+  ConflictException = 409;
+  InvalidRequestException = 400;
+  InternalServerException = 500;
 }
 
 message KeyValue {
   string key = 1;
 
+  /*
+    For first write of store, version should be '0'. If write succeeds, clients must increment
+    their corresponding key version(on device) by 1.
+   */
   int64 version = 2;
 
   bytes value = 3;

settings.gradle

@@ -1,2 +1,2 @@
-rootProject.name = 'ess-server'
-
+rootProject.name = 'vss-server'
+include 'app'