Replace protoc with buf and add build script for generating code from the protos (#174)

## Problem

The code generation using proto file was done using protoc and the
process was manual.

## Solution

Added a script to generate java classes using
[buf](https://buf.build/docs/generate/overview/).

## Type of Change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [X] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update
- [ ] Infrastructure change (CI configs, etc)
- [ ] Non-code change (docs, etc)
- [ ] None of the above: (explain here)

## Test Plan

Integration tests should run successfully.

Author: rohanshah18

build.gradle

@@ -52,7 +52,7 @@ dependencies {
     implementation 'com.google.code.gson:gson:2.9.1'
     implementation 'io.gsonfire:gson-fire:1.8.5'
     implementation 'org.openapitools:jackson-databind-nullable:0.2.6'
-    implementation 'com.google.protobuf:protobuf-java:3.25.2'
+    implementation 'com.google.protobuf:protobuf-java:4.29.3'
     compileOnly "org.apache.tomcat:annotations-api:6.0.53" // necessary for Java 9+
 
     testImplementation("com.squareup.okhttp3:mockwebserver:4.12.0")

codegen/apis

@@ -0,0 +1,6 @@
+version: v1
+plugins:
+  - name: java
+    out: gen/java
+  - name: grpc-java
+    out: gen/java

codegen/buf.gen.yaml

@@ -0,0 +1,6 @@
+# Generated by buf. DO NOT EDIT.
+version: v2
+deps:
+  - name: buf.build/googleapis/googleapis
+    commit: e93e34f48be043dab55be31b4b47f458
+    digest: b5:cebe5dfac5f7d67c55296f37ad9d368dba8d9862777e69d5d99eb1d72dc95fa68cd6323b483ca42cf70e66060002c1bc36e1f5f754b217a5c771c108eb243dbf

codegen/buf.lock

@@ -0,0 +1,12 @@
+# For details on buf.yaml configuration, visit https://buf.build/docs/configuration/v2/buf-yaml
+version: v2
+lint:
+  use:
+    - STANDARD
+breaking:
+  use:
+    - FILE
+deps:
+  - buf.build/googleapis/googleapis
+modules:
+  - path: apis/_build/2025-01

codegen/buf.yaml

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+set -eux -o pipefail
+version=$1 # e.g. 2024-07
+
+update_apis_repo() {
+	echo "Updating apis repo"
+	pushd codegen/apis
+		git fetch
+		git checkout main
+		git pull
+		just build
+	popd
+}
+
+update_buf_config() {
+    pushd codegen
+        # Update buf config to find correct proto version
+        sed -i '' "s/[0-9][0-9][0-9][0-9]-[0-1][0-9]/${version}/g" buf.yaml
+
+        # Clean before building
+        rm -rf gen
+
+        # Ensure path valid by running the buf build command
+        buf build
+    popd
+}
+
+buf_generate() {
+    pushd codegen
+        # Generate the java code
+        buf generate
+    popd
+}
+
+update_apis_repo
+update_buf_config
+buf_generate
+
+dest="src/main/java/io/pinecone/proto/"
+
+# Remove existing files in dest
+rm -rf "${dest}*.java"
+
+# Copy the new generated files to dest directory
+cp codegen/gen/java/io/pinecone/proto/*.java ${dest}
+
+# Cleanup the intermediate files that were generated
+rm -rf codegen/gen

codegen/build-grpc.sh

@@ -1,15 +1,10 @@
 package io.pinecone.helpers;
 
-import io.pinecone.clients.Index;
 import io.pinecone.clients.Pinecone;
-import io.pinecone.proto.DescribeIndexStatsResponse;
-import io.pinecone.proto.NamespaceSummary;
 import org.openapitools.db_control.client.model.*;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.*;
-
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.fail;
 

src/integration/java/io/pinecone/helpers/TestUtilities.java

@@ -5,9 +5,9 @@
 import io.pinecone.exceptions.PineconeException;
 import io.pinecone.exceptions.PineconeValidationException;
 import io.pinecone.helpers.RandomStringBuilder;
-import io.pinecone.proto.FetchResponse;
 import io.pinecone.helpers.TestResourcesManager;
 
+import io.pinecone.proto.FetchResponse;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Disabled;