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Statistics value item

This osmo_stat_item module adds instrumentation capabilities to gather measurement and statistical values in a similar fashion to what we have as osmo_counter_group. More...

## Files

file | stat_item.h

## Data Structures

struct | osmo_stat_item_desc
| Statistics item description. More...
struct | osmo_stat_item_group_desc
| Description of a statistics item group. More...
struct | osmo_stat_item_group
| One instance of a counter group class. More...
struct | osmo_stat_item_period
struct | osmo_stat_item
| data we keep for each actual item More...

## Macros

#define | OSMO_STAT_ITEM_NOVALUE_ID 0
#define | OSMO_STAT_ITEM_NO_UNIT NULL

## Typedefs

typedef int(* | osmo_stat_item_handler_t) (struct osmo_stat_item_group *, struct osmo_stat_item *, void *)
typedef int(* | osmo_stat_item_group_handler_t) (struct osmo_stat_item_group *, void *)

## Functions

struct osmo_stat_item_group * | osmo_stat_item_group_alloc (void *ctx, const struct osmo_stat_item_group_desc *group_desc, unsigned int idx)
| Allocate a new group of counters according to description.
static void | osmo_stat_item_group_udp_idx (struct osmo_stat_item_group *grp, unsigned int idx)
struct osmo_stat_item * | osmo_stat_item_group_get_item (struct osmo_stat_item_group *grp, unsigned int idx)
| Get statistics item from group, identified by index idx.
void | osmo_stat_item_group_set_name (struct osmo_stat_item_group *statg, const char *name)
| Set a name for the statistics item group to be used instead of index value at report time.
void | osmo_stat_item_group_free (struct osmo_stat_item_group *grp)
| Free the memory for the specified group of stat items.
void | osmo_stat_item_inc (struct osmo_stat_item *item, int32_t value)
| Increase the stat_item to the given value.
void | osmo_stat_item_dec (struct osmo_stat_item *item, int32_t value)
| Descrease the stat_item to the given value.
void | osmo_stat_item_set (struct osmo_stat_item *item, int32_t value)
| Set the a given stat_item to the given value.
int | osmo_stat_item_init (void *tall_ctx)
| Initialize the stat item module.
struct osmo_stat_item_group * | osmo_stat_item_get_group_by_name_idx (const char *name, const unsigned int idx)
| Search for item group based on group name and index.
struct osmo_stat_item_group * | osmo_stat_item_get_group_by_name_idxname (const char *group_name, const char *idx_name)
| Search for item group based on group name and index's name.
const struct osmo_stat_item * | osmo_stat_item_get_by_name (const struct osmo_stat_item_group *statg, const char *name)
| Search for item based on group + item name.
int32_t | osmo_stat_item_get_last (const struct osmo_stat_item *item)
| Get the last (freshest) value.
void | osmo_stat_item_flush (struct osmo_stat_item *item)
| Indicate that a reporting period has elapsed, and prepare the stat item for a new period of collecting min/max/avg.
int | osmo_stat_item_for_each_item (struct osmo_stat_item_group *statg, osmo_stat_item_handler_t handle_item, void *data)
| Iterate over all items in group, call user-supplied function on each.
int | osmo_stat_item_for_each_group (osmo_stat_item_group_handler_t handle_group, void *data)
| Iterate over all stat_item groups in system, call user-supplied function on each.
void | osmo_stat_item_reset (struct osmo_stat_item *item)
| Remove all values of a stat item.
void | osmo_stat_item_group_reset (struct osmo_stat_item_group *statg)
| Reset all osmo stat items in a group.
const struct osmo_stat_item_desc * | osmo_stat_item_get_desc (struct osmo_stat_item *item)
| Return the description for an osmo_stat_item.
static | LLIST_HEAD (osmo_stat_item_groups)
| global list of stat_item groups

## Variables

static void * | tall_stat_item_ctx
| talloc context from which we allocate

## Detailed Description

This osmo_stat_item module adds instrumentation capabilities to gather measurement and statistical values in a similar fashion to what we have as osmo_counter_group.

As opposed to counters, osmo_stat_item do not increment but consist of a configurable-sized FIFO, which can store not only the current (most recent) value, but also historic values.

The only supported value type is an int32_t.

Getting values from osmo_stat_item is usually done at a high level through the stats API (stats.c). It uses item->stats_next_id to store what has been sent to all enabled reporters. It is also possible to read from osmo_stat_item directly, without modifying its state, by storing next_id outside of osmo_stat_item.

Each value stored in the FIFO of an osmo_stat_item has an associated value_id. The value_id is increased with each value, so (until the counter wraps) more recent values will have higher values.

When a new value is set, the oldest value in the FIFO gets silently overwritten. Lost values are skipped when getting values from the item.

## Macro Definition Documentation

## OSMO_STAT_ITEM_NO_UNIT

#define OSMO_STAT_ITEM_NO_UNIT NULL

## OSMO_STAT_ITEM_NOVALUE_ID

#define OSMO_STAT_ITEM_NOVALUE_ID 0

## Typedef Documentation

## osmo_stat_item_group_handler_t

typedef int(* osmo_stat_item_group_handler_t) (struct osmo_stat_item_group *, void *)

## osmo_stat_item_handler_t

typedef int(* osmo_stat_item_handler_t) (struct osmo_stat_item_group *, struct osmo_stat_item *, void *)

## Function Documentation

## LLIST_HEAD()

LLIST_HEAD | ( | osmo_stat_item_groups |  | ) |

static

global list of stat_item groups

## osmo_stat_item_dec()

void osmo_stat_item_dec | ( | struct osmo_stat_item * | item,
|  | int32_t | value )

Descrease the stat_item to the given value.

This function adds a new value for the given stat_item at the end of the FIFO.

Parameters

  [in] | item | The stat_item whose value we want to set
  [in] | value | The numeric value we want to store at end of FIFO

References osmo_stat_item_period::last, osmo_stat_item_set(), and osmo_stat_item::value.

## osmo_stat_item_flush()

void osmo_stat_item_flush | ( | struct osmo_stat_item * | item | ) |

Indicate that a reporting period has elapsed, and prepare the stat item for a new period of collecting min/max/avg.

Parameters

  item | Stat item to flush.

References osmo_stat_item_period::last, osmo_stat_item_period::max, osmo_stat_item_period::min, osmo_stat_item_period::n, osmo_stat_item::reported, osmo_stat_item_period::sum, and osmo_stat_item::value.

Referenced by osmo_stat_item_handler().

## osmo_stat_item_for_each_group()

int osmo_stat_item_for_each_group | ( | osmo_stat_item_group_handler_t | handle_group,
|  | void * | data )

Iterate over all stat_item groups in system, call user-supplied function on each.

Parameters

  [in] | handle_group | Call-back function, aborts if rc < 0
  [in] | data | Private data handed through to handle_group

References osmo_stat_item_group::list, and llist_for_each_entry.

Referenced by osmo_stats_report().

## osmo_stat_item_for_each_item()

int osmo_stat_item_for_each_item | ( | struct osmo_stat_item_group * | statg,
|  | osmo_stat_item_handler_t | handle_item,
|  | void * | data )

Iterate over all items in group, call user-supplied function on each.

Parameters

  [in] | statg | stat_item group over whose items to iterate
  [in] | handle_item | Call-back function, aborts if rc < 0
  [in] | data | Private data handed through to handle_item

References osmo_stat_item_group::desc, osmo_stat_item_group::items, and osmo_stat_item_group_desc::num_items.

Referenced by osmo_stat_item_group_handler().

## osmo_stat_item_get_by_name()

const struct osmo_stat_item * osmo_stat_item_get_by_name | ( | const struct osmo_stat_item_group * | statg,
|  | const char * | name )

Search for item based on group + item name.

Parameters

  [in] | statg | group in which to search for the item
  [in] | name | name of item to search within statg

Returns
  pointer to item, if found; NULL otherwise

References osmo_stat_item_group::desc, osmo_stat_item_group_desc::item_desc, osmo_stat_item_group::items, name, osmo_stat_item_desc::name, and osmo_stat_item_group_desc::num_items.

## osmo_stat_item_get_desc()

const struct osmo_stat_item_desc * osmo_stat_item_get_desc | ( | struct osmo_stat_item * | item | ) |

Return the description for an osmo_stat_item.

References osmo_stat_item::desc.

## osmo_stat_item_get_group_by_name_idx()

struct osmo_stat_item_group * osmo_stat_item_get_group_by_name_idx | ( | const char * | name,
|  | const unsigned int | idx )

Search for item group based on group name and index.

Parameters

  [in] | name | Name of stats_item_group we want to find
  [in] | idx | Index of the group we want to find

Returns
  pointer to group, if found; NULL otherwise

References osmo_stat_item_group::desc, osmo_stat_item_group_desc::group_name_prefix, osmo_stat_item_group::idx, osmo_stat_item_group::list, llist_for_each_entry, and name.

## osmo_stat_item_get_group_by_name_idxname()

struct osmo_stat_item_group * osmo_stat_item_get_group_by_name_idxname | ( | const char * | group_name,
|  | const char * | idx_name )

Search for item group based on group name and index's name.

Parameters

  [in] | name | Name of stats_item_group we want to find.
  [in] | idx_name | Index of the group we want to find, by the index's name (osmo_stat_item_group->name).

Returns
  pointer to group, if found; NULL otherwise.

References osmo_stat_item_group::desc, osmo_stat_item_group_desc::group_name_prefix, osmo_stat_item_group::list, llist_for_each_entry, and osmo_stat_item_group::name.

## osmo_stat_item_get_last()

int32_t osmo_stat_item_get_last | ( | const struct osmo_stat_item * | item | ) |

Get the last (freshest) value.

References osmo_stat_item_period::last, and osmo_stat_item::value.

## osmo_stat_item_group_alloc()

struct osmo_stat_item_group * osmo_stat_item_group_alloc | ( | void * | ctx,
|  | const struct osmo_stat_item_group_desc * | group_desc,
|  | unsigned int | idx )

Allocate a new group of counters according to description.

Allocate a group of stat items described in desc from talloc context ctx, giving the new group the index idx.

Parameters

  [in] | ctx | talloc context
  [in] | desc | Statistics item group description
  [in] | idx | Index of new stat item group

References osmo_stat_item_desc::default_value, osmo_stat_item::desc, osmo_stat_item_group::desc, osmo_stat_item_group::idx, osmo_stat_item_group_desc::item_desc, osmo_stat_item_group::items, osmo_stat_item_group::list, llist_add(), osmo_stat_item_group_desc::num_items, OSMO_ASSERT, and tall_stat_item_ctx.

Referenced by fill_stats().

## osmo_stat_item_group_free()

void osmo_stat_item_group_free | ( | struct osmo_stat_item_group * | statg | ) |

Free the memory for the specified group of stat items.

References osmo_stat_item_group::list, and llist_del().

Referenced by osmo_stats_tcp_osmo_fd_unregister().

## osmo_stat_item_group_get_item()

struct osmo_stat_item * osmo_stat_item_group_get_item | ( | struct osmo_stat_item_group * | grp,
|  | unsigned int | idx )

Get statistics item from group, identified by index idx.

Parameters

  [in] | grp | Rate counter group
  [in] | idx | Index of the counter to retrieve

Returns
  rate counter requested

References osmo_stat_item_group::items.

Referenced by fill_stats().

## osmo_stat_item_group_reset()

void osmo_stat_item_group_reset | ( | struct osmo_stat_item_group * | statg | ) |

Reset all osmo stat items in a group.

Parameters

  [in] | statg | stat item group to reset

References osmo_stat_item_group::desc, osmo_stat_item_group::items, osmo_stat_item_group_desc::num_items, and osmo_stat_item_reset().

## osmo_stat_item_group_set_name()

void osmo_stat_item_group_set_name | ( | struct osmo_stat_item_group * | statg,
|  | const char * | name )

Set a name for the statistics item group to be used instead of index value at report time.

Parameters

  [in] | statg | Statistics item group
  [in] | name | Name identifier to assign to the statistics item group

References name, osmo_stat_item_group::name, and osmo_talloc_replace_string().

Referenced by fill_stats().

## osmo_stat_item_group_udp_idx()

void osmo_stat_item_group_udp_idx | ( | struct osmo_stat_item_group * | grp,
|  | unsigned int | idx )

inline static

References osmo_stat_item_group::idx.

## osmo_stat_item_inc()

void osmo_stat_item_inc | ( | struct osmo_stat_item * | item,
|  | int32_t | value )

Increase the stat_item to the given value.

This function adds a new value for the given stat_item at the end of the FIFO.

Parameters

  [in] | item | The stat_item whose value we want to set
  [in] | value | The numeric value we want to store at end of FIFO

References osmo_stat_item_period::last, osmo_stat_item_set(), and osmo_stat_item::value.

## osmo_stat_item_init()

int osmo_stat_item_init | ( | void * | tall_ctx | ) |

Initialize the stat item module.

Call this once from your program.

Parameters

  [in] | tall_ctx | Talloc context from which this module allocates

References tall_stat_item_ctx.

## osmo_stat_item_reset()

void osmo_stat_item_reset | ( | struct osmo_stat_item * | item | ) |

Remove all values of a stat item.

Parameters

  [in] | item | stat item to reset

References osmo_stat_item_desc::default_value, osmo_stat_item::desc, osmo_stat_item_period::last, osmo_stat_item_period::max, osmo_stat_item_period::min, osmo_stat_item_period::n, osmo_stat_item_period::sum, and osmo_stat_item::value.

Referenced by osmo_stat_item_group_reset().

## osmo_stat_item_set()

void osmo_stat_item_set | ( | struct osmo_stat_item * | item,
|  | int32_t | value )

Set the a given stat_item to the given value.

This function adds a new value for the given stat_item at the end of the FIFO.

Parameters

  [in] | item | The stat_item whose value we want to set
  [in] | value | The numeric value we want to store at end of FIFO

References osmo_stat_item_period::last, osmo_stat_item_period::max, osmo_stat_item_period::min, osmo_stat_item_period::n, OSMO_MAX, OSMO_MIN, osmo_stat_item_period::sum, and osmo_stat_item::value.

Referenced by fill_stats(), osmo_stat_item_dec(), and osmo_stat_item_inc().

## Variable Documentation

## tall_stat_item_ctx

void* tall_stat_item_ctx

static

talloc context from which we allocate

Referenced by osmo_stat_item_group_alloc(), and osmo_stat_item_init().