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1 // SPDX-License-Identifier: GPL-3.0-or-later
2
3 #ifndef NETDATA_MCP_TOOLS_EXECUTE_FUNCTION_REGISTRY_H
4 #define NETDATA_MCP_TOOLS_EXECUTE_FUNCTION_REGISTRY_H
5
6 #include "mcp.h"
7 #include "mcp-tools-execute-function-internal.h"
8
9 // Registry entry TTL in seconds (10 minutes)
10 #define MCP_FUNCTIONS_REGISTRY_TTL 600
11
12 // Parameter type enumeration
13 typedef enum mcp_required_params_type {
14 MCP_REQUIRED_PARAMS_TYPE_SELECT = 0,
15 MCP_REQUIRED_PARAMS_TYPE_MULTISELECT
16 } MCP_REQUIRED_PARAMS_TYPE;
17
18 ENUM_STR_DEFINE_FUNCTIONS_EXTERN(MCP_REQUIRED_PARAMS_TYPE)
19 ENUM_STR_DEFINE_FUNCTIONS_EXTERN(MCP_PAGINATION_UNITS)
20
21 // Parameter option structure
22 typedef struct mcp_function_param_option {
23 STRING *id;
24 STRING *name;
25 STRING *info; // Additional information about the option (e.g., file count, size, coverage)
26 } MCP_FUNCTION_PARAM_OPTION;
27
28 // Parameter structure
29 typedef struct mcp_function_param {
30 STRING *id;
31 STRING *name;
32 STRING *help;
33 MCP_REQUIRED_PARAMS_TYPE type;
34 bool unique_view;
35 size_t options_count;
36 MCP_FUNCTION_PARAM_OPTION *options;
37 } MCP_FUNCTION_PARAM;
38
39 // Pagination structure for MCP-compliant cursor-based pagination
40 typedef struct mcp_function_pagination {
41 bool enabled; // whether pagination is supported
42 STRING *key; // parameter name for pagination (e.g., "anchor")
43 STRING *column; // column name in data (e.g., "timestamp")
44 MCP_PAGINATION_UNITS units; // units of the column - only known types supported
45 } MCP_FUNCTION_PAGINATION;
46
47 // Registry entry structure
48 typedef struct mcp_function_registry_entry {
49 RW_SPINLOCK spinlock; // Read/write lock for thread-safe access
50 SPINLOCK update_spinlock; // Spinlock to coordinate updates without blocking readers
51 MCP_FUNCTION_TYPE type; // Function type (table, table with history, etc.)
52 bool has_history; // whether the function supports history
53 int update_every; // update interval in seconds
54 STRING *help; // help text
55 int version; // Function version (v3+ supports POST)
56 bool supports_post; // true if version >= 3
57 size_t required_params_count; // number of required parameters
58 MCP_FUNCTION_PARAM *required_params; // array of required parameters
59 // Supported optional parameters (detected from accepted_params)
60 bool has_timeframe; // supports after, before parameters
61 bool has_last; // supports last parameter (row limit)
62 bool has_data_only; // supports data_only parameter
63 bool has_direction; // supports direction parameter
64 bool has_query; // supports query parameter for full-text search
65 bool has_slice; // supports slice parameter for database-level filtering
66 MCP_FUNCTION_PAGINATION pagination; // MCP-compliant cursor pagination support
67 time_t last_update; // timestamp of last info update
68 time_t expires; // expiration timestamp
69 } MCP_FUNCTION_REGISTRY_ENTRY;
70
71 // Initialize the functions registry
72 void mcp_functions_registry_init(void);
73
74 // Cleanup the functions registry
75 void mcp_functions_registry_cleanup(void);
76
77 // Get a registry entry for a function (read-locked)
78 // This will fetch info if the entry doesn't exist or has expired
79 // The returned entry is read-locked and MUST be released with mcp_functions_registry_release()
80 // Returns NULL on error (with error details in the error buffer)
81 MCP_FUNCTION_REGISTRY_ENTRY *mcp_functions_registry_get(RRDHOST *host, const char *function_name, BUFFER *error);
82
83 // Release a registry entry (unlocks the read lock)
84 // MUST be called after mcp_functions_registry_get() as soon as possible
85 void mcp_functions_registry_release(MCP_FUNCTION_REGISTRY_ENTRY *entry);
86
87 #endif // NETDATA_MCP_TOOLS_EXECUTE_FUNCTION_REGISTRY_H