feat: add multi proto grpc app (#188)

* feat: add multi proto grpc app

Signed-off-by: gouravkrosx <gouravgreatkr@gmail.com>

* fix: path

Signed-off-by: gouravkrosx <gouravgreatkr@gmail.com>

---------

Signed-off-by: gouravkrosx <gouravgreatkr@gmail.com>

Author: gouravkrosx

grpc-apps/multi-proto/README.md

@@ -0,0 +1,140 @@
+# Multi-Proto gRPC Application
+
+A gRPC server application demonstrating multiple protocol buffer files with complex data types including strings, integers, booleans, nested objects, maps, repeated fields, and timestamp usage.
+
+## Purpose
+
+This sample app helps Keploy verify whether the Protoscope-to-JSON feature is functioning correctly.
+
+## Prerequisites
+
+Before you begin, ensure you have Go installed on your system.
+
+## Generate Go Files from Proto Definitions
+
+### 1. Install Required Tools
+
+Install the Protocol Buffer compiler and Go plugins:
+
+```bash
+# Install protoc-gen-go
+go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+
+# Install protoc-gen-go-grpc
+go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+
+# Ensure the protoc compiler is installed
+# For macOS:
+brew install protobuf
+
+# For Linux (Ubuntu/Debian):
+sudo apt update
+sudo apt install -y protobuf-compiler
+```
+
+Make sure `$GOPATH/bin` is in your PATH:
+
+```bash
+export PATH="$PATH:$(go env GOPATH)/bin"
+```
+
+### 2. Generate Go Code
+
+Navigate to the protos directory and run the generation script:
+
+```bash
+cd protos
+chmod +x generate.sh
+./generate.sh
+```
+
+This will generate Go code for all proto files in the `svc/v1` directory.
+
+## Install grpcurl
+
+grpcurl is a command-line tool for interacting with gRPC servers.
+
+### Installation
+
+```bash
+# Install grpcurl using Go
+go install github.com/fullstorydev/grpcurl/cmd/grpcurl@latest
+```
+
+### Set PATH
+
+Ensure `grpcurl` is in your PATH:
+
+```bash
+# Add this to your ~/.bashrc, ~/.zshrc, or equivalent
+export PATH="$PATH:$(go env GOPATH)/bin"
+
+# Reload your shell configuration
+source ~/.bashrc  # or source ~/.zshrc
+```
+
+Verify installation:
+
+```bash
+grpcurl --version
+```
+
+## Run the Application
+
+### 1. Install Dependencies
+
+Navigate to the server directory and install dependencies:
+
+```bash
+cd server
+go mod tidy
+```
+
+### 2. Start the Server
+
+```bash
+go run main.go
+```
+
+The server will start listening on port `50051`.
+
+## Test with grpcurl
+
+### GetSimpleData API
+
+```bash
+grpcurl -plaintext -d '{"id": "123"}' localhost:50051 svc.v1.DataService/GetSimpleData
+```
+
+Expected response:
+```json
+{
+  "message": "Simple data retrieved successfully",
+  "code": 200,
+  "success": true,
+  "value": 123.45,
+  "items": ["item1", "item2", "item3"],
+  "metadata": {
+    "key1": "value1",
+    "key2": "value2"
+  },
+  "timestamp": "2025-11-26T..."
+}
+```
+
+### GetComplexData API
+
+```bash
+grpcurl -plaintext -d '{"query": "test", "limit": 10}' localhost:50051 svc.v1.DataService/GetComplexData
+```
+
+Expected response includes users, products, statistics, and metadata with timestamps.
+
+## List Available Services
+
+To see all available services and methods:
+
+```bash
+grpcurl -plaintext localhost:50051 list
+grpcurl -plaintext localhost:50051 list svc.v1.DataService
+```

grpc-apps/multi-proto/protos/generate.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Exit on error
+set -e
+
+echo "Generating Go code from proto files..."
+
+# Generate Go code for svc/v1 proto files
+# -I. includes the current directory (protos/)
+# -I../third_party includes the third_party directory at multi-proto root
+protoc --go_out=. --go_opt=paths=source_relative \
+    --go-grpc_out=. --go-grpc_opt=paths=source_relative \
+    -I. \
+    -I../third_party \
+    svc/v1/*.proto
+
+echo "✓ Proto files generated successfully!"

grpc-apps/multi-proto/protos/go.mod

@@ -0,0 +1,16 @@
+module github.com/keploy/samples-go/grpc-apps/multi-proto/protos
+
+go 1.21
+
+require (
+	google.golang.org/grpc v1.59.0
+	google.golang.org/protobuf v1.31.0
+)
+
+require (
+	github.com/golang/protobuf v1.5.3 // indirect
+	golang.org/x/net v0.18.0 // indirect
+	golang.org/x/sys v0.14.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20231106174013-bbf56f31fb17 // indirect
+)