forge/arma/server/docs/api-reference.md

Redis Client API Reference

Complete reference for raw Redis operations available in the Forge Server extension. This module returns native Redis values without JSON formatting.

Note

: This is a low-level data access layer. Higher-level game modules (actor, garage, etc.) will provide structured JSON responses for SQF consumption.

🏗️ Implementation

All Redis operations are implemented using the redis_operation! macro for:

• Consistent Error Handling: All functions return identical error formats
• Connection Management: Automatic pool and connection handling
• Synchronous Interface: Functions block until Redis operations complete
• Performance: Zero-cost abstraction with compile-time optimization

🔗 Command Structure

All redis client commands follow the pattern: "forge_server" callExtension ["redis:command", [parameters]]

📝 Common Operations

SET - Store a key-value pair

Command: redis:common:set Parameters: [key, value]

"forge_server" callExtension ["redis:common:set", ["player_name", "John"]]

Raw Response: "OK"

GET - Retrieve a value by key

Command: redis:common:get Parameters: [key]

"forge_server" callExtension ["redis:common:get", ["player_name"]]

Raw Response: "John" (the actual stored value)

INCR - Increment a numeric value

Command: redis:common:incr Parameters: [key, increment_amount]

"forge_server" callExtension ["redis:common:incr", ["player_score", 10]]

Raw Response: "110" (the new value as string)

DECR - Decrement a numeric value

Command: redis:common:decr Parameters: [key, decrement_amount]

"forge_server" callExtension ["redis:common:decr", ["player_lives", 1]]

Raw Response: "2" (the new value as string)

DEL - Delete a key

Command: redis:common:del Parameters: [key]

"forge_server" callExtension ["redis:common:del", ["temp_data"]]

Raw Response: "1" (number of keys deleted)

KEYS - List all keys matching pattern

Command: redis:common:keys Parameters: [] (currently returns all keys with "*" pattern)

"forge_server" callExtension ["redis:common:keys", []]

Raw Response: "player_name,player_score,mission_state" (comma-separated list)

🗂️ Hash Operations

HSET - Set hash field

Command: redis:hash:set Parameters: [hash_key, field, value]

"forge_server" callExtension ["redis:hash:set", ["player:123", "name", "John"]]

Raw Response: "1" (number of fields added)

HGET - Get hash field

Command: redis:hash:get Parameters: [hash_key, field]

"forge_server" callExtension ["redis:hash:get", ["player:123", "name"]]

Raw Response: "John" (the field value)

HMSET - Set multiple hash fields

Command: redis:hash:mset Parameters: [hash_key, [[field1, value1], [field2, value2], ...]]

"forge_server" callExtension ["redis:hash:mset", ["player:123", [["name", "John"], ["score", "100"]]]]

Raw Response: "OK"

HGETALL - Get all hash fields

Command: redis:hash:getall Parameters: [hash_key]

"forge_server" callExtension ["redis:hash:getall", ["player:123"]]

Raw Response: "name,John,score,100,level,5" (comma-separated key-value pairs)

HDEL - Delete hash field

Command: redis:hash:del Parameters: [hash_key, field]

"forge_server" callExtension ["redis:hash:del", ["player:123", "temp_field"]]

Raw Response: "1" (number of fields removed)

HKEYS - Get all hash field names

Command: redis:hash:keys Parameters: [hash_key]

"forge_server" callExtension ["redis:hash:keys", ["player:123"]]

Raw Response: "name,score,level" (comma-separated field names)

HVALS - Get all hash values

Command: redis:hash:vals Parameters: [hash_key]

"forge_server" callExtension ["redis:hash:vals", ["player:123"]]

Raw Response: "John,100,5" (comma-separated values)

HLEN - Get hash field count

Command: redis:hash:len Parameters: [hash_key]

"forge_server" callExtension ["redis:hash:len", ["player:123"]]

Raw Response: "3" (number of fields in hash)

📋 List Operations

LSET - Set list element by index

Command: redis:list:set Parameters: [list_key, index, value]

"forge_server" callExtension ["redis:list:set", ["mission_queue", 0, "patrol_alpha"]]

Raw Response: "OK"

LGET - Get list element by index

Command: redis:list:get Parameters: [list_key, index]

"forge_server" callExtension ["redis:list:get", ["mission_queue", 0]]

Raw Response: "patrol_alpha" (the element value)

LLEN - Get list length

Command: redis:list:len Parameters: [list_key]

"forge_server" callExtension ["redis:list:len", ["mission_queue"]]

Raw Response: "5" (list length)

LRANGE - Get list elements in range

Command: redis:list:range Parameters: [list_key, start_index, end_index]

"forge_server" callExtension ["redis:list:range", ["mission_queue", 0, 2]]

Raw Response: "patrol_alpha,escort_beta,defend_gamma" (comma-separated values)

LPUSH - Add element to list head

Command: redis:list:lpush Parameters: [list_key, value]

"forge_server" callExtension ["redis:list:lpush", ["recent_actions", "player_joined"]]

Raw Response: "6" (new list length)

RPUSH - Add element to list tail

Command: redis:list:rpush Parameters: [list_key, value]

"forge_server" callExtension ["redis:list:rpush", ["mission_queue", "new_objective"]]

Raw Response: "6" (new list length)

LPOP - Remove and return element from list head

Command: redis:list:lpop Parameters: [list_key, count]

"forge_server" callExtension ["redis:list:lpop", ["recent_actions", 1]]

Raw Response: "player_joined" (removed element) or "item1,item2" (if count > 1)

RPOP - Remove and return element from list tail

Command: redis:list:rpop Parameters: [list_key, count]

"forge_server" callExtension ["redis:list:rpop", ["mission_queue", 1]]

Raw Response: "new_objective" (removed element) or "item1,item2" (if count > 1)

LTRIM - Trim list to specified range

Command: redis:list:trim Parameters: [list_key, start_index, end_index]

"forge_server" callExtension ["redis:list:trim", ["recent_actions", 0, 9]]  // Keep only last 10 items

Raw Response: "OK"

LREM - Remove elements from list

Command: redis:list:del Parameters: [list_key, count, value]

"forge_server" callExtension ["redis:list:del", ["mission_queue", 1, "completed_mission"]]

Raw Response: "1" (number of elements removed)

🎯 Set Operations

SADD - Add element to set

Command: redis:set:add Parameters: [set_key, value]

"forge_server" callExtension ["redis:set:add", ["online_players", "player_123"]]

Raw Response: "1" (1 if element was added, 0 if already existed)

SMEMBERS - Get all set members

Command: redis:set:members Parameters: [set_key]

"forge_server" callExtension ["redis:set:members", ["online_players"]]

Raw Response: "player_123,player_456,player_789" (comma-separated members)

SCARD - Get set size

Command: redis:set:card Parameters: [set_key]

"forge_server" callExtension ["redis:set:card", ["online_players"]]

Raw Response: "3" (number of elements in set)

SREM - Remove element from set

Command: redis:set:del Parameters: [set_key, value]

"forge_server" callExtension ["redis:set:del", ["online_players", "player_456"]]

Raw Response: "1" (1 if element was removed, 0 if didn't exist)

SISMEMBER - Check if element is in set

Command: redis:set:ismember Parameters: [set_key, value]

"forge_server" callExtension ["redis:set:ismember", ["online_players", "player_123"]]

Raw Response: "1" (1 if member exists, 0 if not)

SPOP - Remove and return random element

Command: redis:set:pop Parameters: [set_key]

"forge_server" callExtension ["redis:set:pop", ["available_missions"]]

Raw Response: "mission_alpha" (the removed element)

SRANDMEMBER - Get random element without removing

Command: redis:set:randmember Parameters: [set_key]

"forge_server" callExtension ["redis:set:randmember", ["available_missions"]]

Raw Response: "mission_beta" (a random element)

SRANDMEMBER - Get multiple random elements

Command: redis:set:randmembers Parameters: [set_key, count]

"forge_server" callExtension ["redis:set:randmembers", ["available_missions", 3]]

Raw Response: "mission_alpha,mission_gamma,mission_delta" (comma-separated random elements)

⚠️ Error Responses

All commands may return error responses in this format:

Raw Error Response: "Error: <description>"

Common Error Types

• Pool not initialized: "Error: Redis pool not initialized"
• Connection failed: "Error: Connection refused (os error 61)"
• Key not found: "Error: key not found" (for operations on non-existent keys)
• Invalid type: "Error: WRONGTYPE Operation against a key holding the wrong kind of value"
• Index out of range: "Error: index out of range" (for list operations)

Error Handling in Game Modules

Higher-level game modules should check if the response starts with "Error: " to distinguish between successful responses and errors.

{
    "status": "error",
    "error": "Failed to connect to Redis server"
}

Common error types:

• Connection errors: Redis server unavailable
• Operation errors: Invalid data type for operation
• Parameter errors: Missing or invalid parameters
• Pool errors: Connection pool exhausted

📊 Response Fields

Common Fields

• status: Always present - "success" or "error"
• key: The Redis key being operated on
• error: Error message (only on error responses)

Success-Specific Fields

• data: The retrieved data (for GET operations)
• value: The stored value (for SET operations)
• was_new: Boolean indicating if operation created new data
• removed_count: Number of elements removed
• fields_set: Number of fields set in hash operations