herodb/examples/simple_demo.sh

#!/bin/bash

# Simple HeroDB Demo - Basic Redis Commands
# This script demonstrates basic Redis functionality that's currently implemented

set -e  # Exit on any error

# Configuration
REDIS_HOST="localhost"
REDIS_PORT="6381"
REDIS_CLI="redis-cli -h $REDIS_HOST -p $REDIS_PORT"

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
BLUE='\033[0;34m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

# Function to print colored output
print_header() {
    echo -e "${BLUE}=== $1 ===${NC}"
}

print_success() {
    echo -e "${GREEN}✓ $1${NC}"
}

print_info() {
    echo -e "${YELLOW}ℹ $1${NC}"
}

print_error() {
    echo -e "${RED}✗ $1${NC}"
}

# Function to check if HeroDB is running
check_herodb() {
    print_info "Checking if HeroDB is running on port $REDIS_PORT..."
    if ! $REDIS_CLI ping > /dev/null 2>&1; then
        print_error "HeroDB is not running on port $REDIS_PORT"
        print_info "Please start HeroDB with: cargo run -- --port $REDIS_PORT"
        exit 1
    fi
    print_success "HeroDB is running and responding"
}

# Function to execute Redis command with error handling
execute_cmd() {
    local cmd="$1"
    local description="$2"
    
    echo -e "${YELLOW}Command:${NC} $cmd"
    if result=$($REDIS_CLI $cmd 2>&1); then
        echo -e "${GREEN}Result:${NC} $result"
        return 0
    else
        print_error "Failed: $description"
        echo "Error: $result"
        return 1
    fi
}

# Main demo function
main() {
    clear
    print_header "HeroDB Basic Functionality Demo"
    echo "This demo shows basic Redis commands that are currently implemented"
    echo "HeroDB runs on port $REDIS_PORT (instead of Redis default 6379)"
    echo

    # Check if HeroDB is running
    check_herodb
    echo

    print_header "Step 1: Basic Key-Value Operations"
    
    execute_cmd "SET greeting 'Hello HeroDB!'" "Setting a simple key-value pair"
    echo
    execute_cmd "GET greeting" "Getting the value"
    echo
    execute_cmd "SET counter 42" "Setting a numeric value"
    echo
    execute_cmd "INCR counter" "Incrementing the counter"
    echo
    execute_cmd "GET counter" "Getting the incremented value"
    echo

    print_header "Step 2: Hash Operations"
    
    execute_cmd "HSET user:1 name 'John Doe' email 'john@example.com' age 30" "Setting hash fields"
    echo
    execute_cmd "HGET user:1 name" "Getting a specific field"
    echo
    execute_cmd "HGETALL user:1" "Getting all fields"
    echo
    execute_cmd "HLEN user:1" "Getting hash length"
    echo

    print_header "Step 3: List Operations"
    
    execute_cmd "LPUSH tasks 'Write code' 'Test code' 'Deploy code'" "Adding items to list"
    echo
    execute_cmd "LLEN tasks" "Getting list length"
    echo
    execute_cmd "LRANGE tasks 0 -1" "Getting all list items"
    echo
    execute_cmd "LPOP tasks" "Popping from left"
    echo
    execute_cmd "LRANGE tasks 0 -1" "Checking remaining items"
    echo

    print_header "Step 4: Key Management"
    
    execute_cmd "KEYS *" "Listing all keys"
    echo
    execute_cmd "EXISTS greeting" "Checking if key exists"
    echo
    execute_cmd "TYPE user:1" "Getting key type"
    echo
    execute_cmd "DBSIZE" "Getting database size"
    echo

    print_header "Step 5: Expiration"
    
    execute_cmd "SET temp_key 'temporary value'" "Setting temporary key"
    echo
    execute_cmd "EXPIRE temp_key 5" "Setting 5 second expiration"
    echo
    execute_cmd "TTL temp_key" "Checking time to live"
    echo
    print_info "Waiting 2 seconds..."
    sleep 2
    execute_cmd "TTL temp_key" "Checking TTL again"
    echo

    print_header "Step 6: Multiple Operations"
    
    execute_cmd "MSET key1 'value1' key2 'value2' key3 'value3'" "Setting multiple keys"
    echo
    execute_cmd "MGET key1 key2 key3" "Getting multiple values"
    echo
    execute_cmd "DEL key1 key2" "Deleting multiple keys"
    echo
    execute_cmd "EXISTS key1 key2 key3" "Checking existence of multiple keys"
    echo

    print_header "Step 7: Search Commands (Placeholder)"
    print_info "Testing FT.CREATE command (currently returns placeholder response)"
    
    execute_cmd "FT.CREATE test_index SCHEMA title TEXT description TEXT" "Creating search index"
    echo

    print_header "Step 8: Server Information"
    
    execute_cmd "INFO" "Getting server information"
    echo
    execute_cmd "CONFIG GET dir" "Getting configuration"
    echo

    print_header "Step 9: Cleanup"
    
    execute_cmd "FLUSHDB" "Clearing database"
    echo
    execute_cmd "DBSIZE" "Confirming database is empty"
    echo

    print_header "Demo Summary"
    echo "This demonstration showed:"
    echo "• Basic key-value operations (GET, SET, INCR)"
    echo "• Hash operations (HSET, HGET, HGETALL)"
    echo "• List operations (LPUSH, LPOP, LRANGE)"
    echo "• Key management (KEYS, EXISTS, TYPE, DEL)"
    echo "• Expiration handling (EXPIRE, TTL)"
    echo "• Multiple key operations (MSET, MGET)"
    echo "• Server information commands"
    echo
    print_success "HeroDB basic functionality demo completed successfully!"
    echo
    print_info "Note: Full-text search (FT.*) commands are defined but not yet fully implemented"
    print_info "To run HeroDB server: cargo run -- --port 6381"
    print_info "To connect with redis-cli: redis-cli -h localhost -p 6381"
}

# Run the demo
main "$@"