diff options
Diffstat (limited to '')
| -rw-r--r-- | web/api/queries/query.c | 989 |
1 files changed, 989 insertions, 0 deletions
diff --git a/web/api/queries/query.c b/web/api/queries/query.c new file mode 100644 index 0000000..f841b65 --- /dev/null +++ b/web/api/queries/query.c @@ -0,0 +1,989 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "query.h" +#include "web/api/formatters/rrd2json.h" +#include "rrdr.h" + +#include "average/average.h" +#include "incremental_sum/incremental_sum.h" +#include "max/max.h" +#include "median/median.h" +#include "min/min.h" +#include "sum/sum.h" +#include "stddev/stddev.h" +#include "ses/ses.h" +#include "des/des.h" + +// ---------------------------------------------------------------------------- + +static struct { + const char *name; + uint32_t hash; + RRDR_GROUPING value; + + // One time initialization for the module. + // This is called once, when netdata starts. + void (*init)(void); + + // Allocate all required structures for a query. + // This is called once for each netdata query. + void *(*create)(struct rrdresult *r); + + // Cleanup collected values, but don't destroy the structures. + // This is called when the query engine switches dimensions, + // as part of the same query (so same chart, switching metric). + void (*reset)(struct rrdresult *r); + + // Free all resources allocated for the query. + void (*free)(struct rrdresult *r); + + // Add a single value into the calculation. + // The module may decide to cache it, or use it in the fly. + void (*add)(struct rrdresult *r, calculated_number value); + + // Generate a single result for the values added so far. + // More values and points may be requested later. + // It is up to the module to reset its internal structures + // when flushing it (so for a few modules it may be better to + // continue after a flush as if nothing changed, for others a + // cleanup of the internal structures may be required). + calculated_number (*flush)(struct rrdresult *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr); +} api_v1_data_groups[] = { + {.name = "average", + .hash = 0, + .value = RRDR_GROUPING_AVERAGE, + .init = NULL, + .create= grouping_create_average, + .reset = grouping_reset_average, + .free = grouping_free_average, + .add = grouping_add_average, + .flush = grouping_flush_average + }, + {.name = "mean", // alias on 'average' + .hash = 0, + .value = RRDR_GROUPING_AVERAGE, + .init = NULL, + .create= grouping_create_average, + .reset = grouping_reset_average, + .free = grouping_free_average, + .add = grouping_add_average, + .flush = grouping_flush_average + }, + {.name = "incremental_sum", + .hash = 0, + .value = RRDR_GROUPING_INCREMENTAL_SUM, + .init = NULL, + .create= grouping_create_incremental_sum, + .reset = grouping_reset_incremental_sum, + .free = grouping_free_incremental_sum, + .add = grouping_add_incremental_sum, + .flush = grouping_flush_incremental_sum + }, + {.name = "incremental-sum", + .hash = 0, + .value = RRDR_GROUPING_INCREMENTAL_SUM, + .init = NULL, + .create= grouping_create_incremental_sum, + .reset = grouping_reset_incremental_sum, + .free = grouping_free_incremental_sum, + .add = grouping_add_incremental_sum, + .flush = grouping_flush_incremental_sum + }, + {.name = "median", + .hash = 0, + .value = RRDR_GROUPING_MEDIAN, + .init = NULL, + .create= grouping_create_median, + .reset = grouping_reset_median, + .free = grouping_free_median, + .add = grouping_add_median, + .flush = grouping_flush_median + }, + {.name = "min", + .hash = 0, + .value = RRDR_GROUPING_MIN, + .init = NULL, + .create= grouping_create_min, + .reset = grouping_reset_min, + .free = grouping_free_min, + .add = grouping_add_min, + .flush = grouping_flush_min + }, + {.name = "max", + .hash = 0, + .value = RRDR_GROUPING_MAX, + .init = NULL, + .create= grouping_create_max, + .reset = grouping_reset_max, + .free = grouping_free_max, + .add = grouping_add_max, + .flush = grouping_flush_max + }, + {.name = "sum", + .hash = 0, + .value = RRDR_GROUPING_SUM, + .init = NULL, + .create= grouping_create_sum, + .reset = grouping_reset_sum, + .free = grouping_free_sum, + .add = grouping_add_sum, + .flush = grouping_flush_sum + }, + + // standard deviation + {.name = "stddev", + .hash = 0, + .value = RRDR_GROUPING_STDDEV, + .init = NULL, + .create= grouping_create_stddev, + .reset = grouping_reset_stddev, + .free = grouping_free_stddev, + .add = grouping_add_stddev, + .flush = grouping_flush_stddev + }, + {.name = "cv", // coefficient variation is calculated by stddev + .hash = 0, + .value = RRDR_GROUPING_CV, + .init = NULL, + .create= grouping_create_stddev, // not an error, stddev calculates this too + .reset = grouping_reset_stddev, // not an error, stddev calculates this too + .free = grouping_free_stddev, // not an error, stddev calculates this too + .add = grouping_add_stddev, // not an error, stddev calculates this too + .flush = grouping_flush_coefficient_of_variation + }, + {.name = "rsd", // alias of 'cv' + .hash = 0, + .value = RRDR_GROUPING_CV, + .init = NULL, + .create= grouping_create_stddev, // not an error, stddev calculates this too + .reset = grouping_reset_stddev, // not an error, stddev calculates this too + .free = grouping_free_stddev, // not an error, stddev calculates this too + .add = grouping_add_stddev, // not an error, stddev calculates this too + .flush = grouping_flush_coefficient_of_variation + }, + + /* + {.name = "mean", // same as average, no need to define it again + .hash = 0, + .value = RRDR_GROUPING_MEAN, + .setup = NULL, + .create= grouping_create_stddev, + .reset = grouping_reset_stddev, + .free = grouping_free_stddev, + .add = grouping_add_stddev, + .flush = grouping_flush_mean + }, + */ + + /* + {.name = "variance", // meaningless to offer + .hash = 0, + .value = RRDR_GROUPING_VARIANCE, + .setup = NULL, + .create= grouping_create_stddev, + .reset = grouping_reset_stddev, + .free = grouping_free_stddev, + .add = grouping_add_stddev, + .flush = grouping_flush_variance + }, + */ + + // single exponential smoothing + {.name = "ses", + .hash = 0, + .value = RRDR_GROUPING_SES, + .init = grouping_init_ses, + .create= grouping_create_ses, + .reset = grouping_reset_ses, + .free = grouping_free_ses, + .add = grouping_add_ses, + .flush = grouping_flush_ses + }, + {.name = "ema", // alias for 'ses' + .hash = 0, + .value = RRDR_GROUPING_SES, + .init = NULL, + .create= grouping_create_ses, + .reset = grouping_reset_ses, + .free = grouping_free_ses, + .add = grouping_add_ses, + .flush = grouping_flush_ses + }, + {.name = "ewma", // alias for ses + .hash = 0, + .value = RRDR_GROUPING_SES, + .init = NULL, + .create= grouping_create_ses, + .reset = grouping_reset_ses, + .free = grouping_free_ses, + .add = grouping_add_ses, + .flush = grouping_flush_ses + }, + + // double exponential smoothing + {.name = "des", + .hash = 0, + .value = RRDR_GROUPING_DES, + .init = grouping_init_des, + .create= grouping_create_des, + .reset = grouping_reset_des, + .free = grouping_free_des, + .add = grouping_add_des, + .flush = grouping_flush_des + }, + + // terminator + {.name = NULL, + .hash = 0, + .value = RRDR_GROUPING_UNDEFINED, + .init = NULL, + .create= grouping_create_average, + .reset = grouping_reset_average, + .free = grouping_free_average, + .add = grouping_add_average, + .flush = grouping_flush_average + } +}; + +void web_client_api_v1_init_grouping(void) { + int i; + + for(i = 0; api_v1_data_groups[i].name ; i++) { + api_v1_data_groups[i].hash = simple_hash(api_v1_data_groups[i].name); + + if(api_v1_data_groups[i].init) + api_v1_data_groups[i].init(); + } +} + +const char *group_method2string(RRDR_GROUPING group) { + int i; + + for(i = 0; api_v1_data_groups[i].name ; i++) { + if(api_v1_data_groups[i].value == group) { + return api_v1_data_groups[i].name; + } + } + + return "unknown-group-method"; +} + +RRDR_GROUPING web_client_api_request_v1_data_group(const char *name, RRDR_GROUPING def) { + int i; + + uint32_t hash = simple_hash(name); + for(i = 0; api_v1_data_groups[i].name ; i++) + if(unlikely(hash == api_v1_data_groups[i].hash && !strcmp(name, api_v1_data_groups[i].name))) + return api_v1_data_groups[i].value; + + return def; +} + +// ---------------------------------------------------------------------------- + +static void rrdr_disable_not_selected_dimensions(RRDR *r, RRDR_OPTIONS options, const char *dims) { + rrdset_check_rdlock(r->st); + + if(unlikely(!dims || !*dims || (dims[0] == '*' && dims[1] == '\0'))) return; + + int match_ids = 0, match_names = 0; + + if(unlikely(options & RRDR_OPTION_MATCH_IDS)) + match_ids = 1; + if(unlikely(options & RRDR_OPTION_MATCH_NAMES)) + match_names = 1; + + if(likely(!match_ids && !match_names)) + match_ids = match_names = 1; + + SIMPLE_PATTERN *pattern = simple_pattern_create(dims, ",|\t\r\n\f\v", SIMPLE_PATTERN_EXACT); + + RRDDIM *d; + long c, dims_selected = 0, dims_not_hidden_not_zero = 0; + for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) { + if( (match_ids && simple_pattern_matches(pattern, d->id)) + || (match_names && simple_pattern_matches(pattern, d->name)) + ) { + r->od[c] |= RRDR_DIMENSION_SELECTED; + if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) r->od[c] &= ~RRDR_DIMENSION_HIDDEN; + dims_selected++; + + // since the user needs this dimension + // make it appear as NONZERO, to return it + // even if the dimension has only zeros + // unless option non_zero is set + if(unlikely(!(options & RRDR_OPTION_NONZERO))) + r->od[c] |= RRDR_DIMENSION_NONZERO; + + // count the visible dimensions + if(likely(r->od[c] & RRDR_DIMENSION_NONZERO)) + dims_not_hidden_not_zero++; + } + else { + r->od[c] |= RRDR_DIMENSION_HIDDEN; + if(unlikely(r->od[c] & RRDR_DIMENSION_SELECTED)) r->od[c] &= ~RRDR_DIMENSION_SELECTED; + } + } + simple_pattern_free(pattern); + + // check if all dimensions are hidden + if(unlikely(!dims_not_hidden_not_zero && dims_selected)) { + // there are a few selected dimensions + // but they are all zero + // enable the selected ones + // to avoid returning an empty chart + for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) + if(unlikely(r->od[c] & RRDR_DIMENSION_SELECTED)) + r->od[c] |= RRDR_DIMENSION_NONZERO; + } +} + +// ---------------------------------------------------------------------------- +// helpers to find our way in RRDR + +static inline RRDR_VALUE_FLAGS *rrdr_line_options(RRDR *r, long rrdr_line) { + return &r->o[ rrdr_line * r->d ]; +} + +static inline calculated_number *rrdr_line_values(RRDR *r, long rrdr_line) { + return &r->v[ rrdr_line * r->d ]; +} + +static inline long rrdr_line_init(RRDR *r, time_t t, long rrdr_line) { + rrdr_line++; + + #ifdef NETDATA_INTERNAL_CHECKS + + if(unlikely(rrdr_line >= r->n)) + error("INTERNAL ERROR: requested to step above RRDR size for chart '%s'", r->st->name); + + if(unlikely(r->t[rrdr_line] != 0 && r->t[rrdr_line] != t)) + error("INTERNAL ERROR: overwriting the timestamp of RRDR line %zu from %zu to %zu, of chart '%s'", (size_t)rrdr_line, (size_t)r->t[rrdr_line], (size_t)t, r->st->name); + + #endif + + // save the time + r->t[rrdr_line] = t; + + return rrdr_line; +} + +static inline void rrdr_done(RRDR *r, long rrdr_line) { + r->rows = rrdr_line + 1; +} + + +// ---------------------------------------------------------------------------- +// fill RRDR for a single dimension + +static inline void do_dimension( + RRDR *r + , long points_wanted + , RRDDIM *rd + , long dim_id_in_rrdr + , long after_slot + , long before_slot + , time_t after_wanted + , time_t before_wanted +){ + (void) before_slot; + + RRDSET *st = r->st; + + time_t + now = after_wanted, + dt = st->update_every, + max_date = 0, + min_date = 0; + + long + slot = after_slot, + group_size = r->group, + points_added = 0, + values_in_group = 0, + values_in_group_non_zero = 0, + rrdr_line = -1, + entries = st->entries; + + RRDR_VALUE_FLAGS + group_value_flags = RRDR_VALUE_NOTHING; + + calculated_number min = r->min, max = r->max; + size_t db_points_read = 0; + for( ; points_added < points_wanted ; now += dt, slot++ ) { + if(unlikely(slot >= entries)) slot = 0; + + // make sure we return data in the proper time range + if(unlikely(now > before_wanted)) { + #ifdef NETDATA_INTERNAL_CHECKS + r->internal.log = "stopped, because attempted to access the db after 'wanted before'"; + #endif + break; + } + if(unlikely(now < after_wanted)) { + #ifdef NETDATA_INTERNAL_CHECKS + r->internal.log = "skipped, because attempted to access the db before 'wanted after'"; + #endif + continue; + } + + // read the value from the database + storage_number n = rd->values[slot]; + calculated_number value = NAN; + if(likely(does_storage_number_exist(n))) { + + value = unpack_storage_number(n); + if(likely(value != 0.0)) + values_in_group_non_zero++; + + if(unlikely(did_storage_number_reset(n))) + group_value_flags |= RRDR_VALUE_RESET; + + } + + // add this value for grouping + r->internal.grouping_add(r, value); + values_in_group++; + db_points_read++; + + if(unlikely(values_in_group == group_size)) { + rrdr_line = rrdr_line_init(r, now, rrdr_line); + + if(unlikely(!min_date)) min_date = now; + max_date = now; + + // find the place to store our values + RRDR_VALUE_FLAGS *rrdr_value_options_ptr = &r->o[rrdr_line * r->d + dim_id_in_rrdr]; + + // update the dimension options + if(likely(values_in_group_non_zero)) + r->od[dim_id_in_rrdr] |= RRDR_DIMENSION_NONZERO; + + // store the specific point options + *rrdr_value_options_ptr = group_value_flags; + + // store the value + calculated_number value = r->internal.grouping_flush(r, rrdr_value_options_ptr); + r->v[rrdr_line * r->d + dim_id_in_rrdr] = value; + + if(likely(points_added || dim_id_in_rrdr)) { + // find the min/max across all dimensions + + if(unlikely(value < min)) min = value; + if(unlikely(value > max)) max = value; + + } + else { + // runs only when dim_id_in_rrdr == 0 && points_added == 0 + // so, on the first point added for the query. + min = max = value; + } + + points_added++; + values_in_group = 0; + group_value_flags = RRDR_VALUE_NOTHING; + values_in_group_non_zero = 0; + } + } + + r->internal.db_points_read += db_points_read; + r->internal.result_points_generated += points_added; + + r->min = min; + r->max = max; + r->before = max_date; + r->after = min_date - (r->group - 1) * r->st->update_every; + rrdr_done(r, rrdr_line); + + #ifdef NETDATA_INTERNAL_CHECKS + if(unlikely(r->rows != points_added)) + error("INTERNAL ERROR: %s.%s added %zu rows, but RRDR says I added %zu.", r->st->name, rd->name, (size_t)points_added, (size_t)r->rows); + #endif +} + +// ---------------------------------------------------------------------------- +// fill RRDR for the whole chart + +#ifdef NETDATA_INTERNAL_CHECKS +static void rrd2rrdr_log_request_response_metdata(RRDR *r + , RRDR_GROUPING group_method + , int aligned + , long group + , long resampling_time + , long resampling_group + , time_t after_wanted + , time_t after_requested + , time_t before_wanted + , time_t before_requested + , long points_requested + , long points_wanted + , size_t after_slot + , size_t before_slot + , const char *msg + ) { + info("INTERNAL ERROR: rrd2rrdr() on %s update every %d with %s grouping %s (group: %ld, resampling_time: %ld, resampling_group: %ld), " + "after (got: %zu, want: %zu, req: %zu, db: %zu), " + "before (got: %zu, want: %zu, req: %zu, db: %zu), " + "duration (got: %zu, want: %zu, req: %zu, db: %zu), " + "slot (after: %zu, before: %zu, delta: %zu), " + "points (got: %ld, want: %ld, req: %ld, db: %ld), " + "%s" + , r->st->name + , r->st->update_every + + // grouping + , (aligned) ? "aligned" : "unaligned" + , group_method2string(group_method) + , group + , resampling_time + , resampling_group + + // after + , (size_t)r->after + , (size_t)after_wanted + , (size_t)after_requested + , (size_t)rrdset_first_entry_t(r->st) + + // before + , (size_t)r->before + , (size_t)before_wanted + , (size_t)before_requested + , (size_t)rrdset_last_entry_t(r->st) + + // duration + , (size_t)(r->before - r->after + r->st->update_every) + , (size_t)(before_wanted - after_wanted + r->st->update_every) + , (size_t)(before_requested - after_requested) + , (size_t)((rrdset_last_entry_t(r->st) - rrdset_first_entry_t(r->st)) + r->st->update_every) + + // slot + , after_slot + , before_slot + , (after_slot > before_slot) ? (r->st->entries - after_slot + before_slot) : (before_slot - after_slot) + + // points + , r->rows + , points_wanted + , points_requested + , r->st->entries + + // message + , msg + ); +} +#endif // NETDATA_INTERNAL_CHECKS + +RRDR *rrd2rrdr( + RRDSET *st + , long points_requested + , long long after_requested + , long long before_requested + , RRDR_GROUPING group_method + , long resampling_time_requested + , RRDR_OPTIONS options + , const char *dimensions +) { + int aligned = !(options & RRDR_OPTION_NOT_ALIGNED); + + int absolute_period_requested = -1; + + time_t first_entry_t = rrdset_first_entry_t(st); + time_t last_entry_t = rrdset_last_entry_t(st); + + if(before_requested == 0 && after_requested == 0) { + // dump the all the data + before_requested = last_entry_t; + after_requested = first_entry_t; + absolute_period_requested = 0; + } + + // allow relative for before (smaller than API_RELATIVE_TIME_MAX) + if(((before_requested < 0)?-before_requested:before_requested) <= API_RELATIVE_TIME_MAX) { + if(abs(before_requested) % st->update_every) { + // make sure it is multiple of st->update_every + if(before_requested < 0) before_requested = before_requested - st->update_every - before_requested % st->update_every; + else before_requested = before_requested + st->update_every - before_requested % st->update_every; + } + if(before_requested > 0) before_requested = first_entry_t + before_requested; + else before_requested = last_entry_t + before_requested; + absolute_period_requested = 0; + } + + // allow relative for after (smaller than API_RELATIVE_TIME_MAX) + if(((after_requested < 0)?-after_requested:after_requested) <= API_RELATIVE_TIME_MAX) { + if(after_requested == 0) after_requested = -st->update_every; + if(abs(after_requested) % st->update_every) { + // make sure it is multiple of st->update_every + if(after_requested < 0) after_requested = after_requested - st->update_every - after_requested % st->update_every; + else after_requested = after_requested + st->update_every - after_requested % st->update_every; + } + after_requested = before_requested + after_requested; + absolute_period_requested = 0; + } + + if(absolute_period_requested == -1) + absolute_period_requested = 1; + + // make sure they are within our timeframe + if(before_requested > last_entry_t) before_requested = last_entry_t; + if(before_requested < first_entry_t) before_requested = first_entry_t; + + if(after_requested > last_entry_t) after_requested = last_entry_t; + if(after_requested < first_entry_t) after_requested = first_entry_t; + + // check if they are reversed + if(after_requested > before_requested) { + time_t tmp = before_requested; + before_requested = after_requested; + after_requested = tmp; + } + + // the duration of the chart + time_t duration = before_requested - after_requested; + long available_points = duration / st->update_every; + + if(duration <= 0 || available_points <= 0) + return rrdr_create(st, 1); + + // check the number of wanted points in the result + if(unlikely(points_requested < 0)) points_requested = -points_requested; + if(unlikely(points_requested > available_points)) points_requested = available_points; + if(unlikely(points_requested == 0)) points_requested = available_points; + + // calculate the desired grouping of source data points + long group = available_points / points_requested; + if(unlikely(group <= 0)) group = 1; + if(unlikely(available_points % points_requested > points_requested / 2)) group++; // rounding to the closest integer + + // resampling_time_requested enforces a certain grouping multiple + calculated_number resampling_divisor = 1.0; + long resampling_group = 1; + if(unlikely(resampling_time_requested > st->update_every)) { + if (unlikely(resampling_time_requested > duration)) { + // group_time is above the available duration + + #ifdef NETDATA_INTERNAL_CHECKS + info("INTERNAL CHECK: %s: requested gtime %ld secs, is greater than the desired duration %ld secs", st->id, resampling_time_requested, duration); + #endif + + after_requested = before_requested - resampling_time_requested; + duration = before_requested - after_requested; + available_points = duration / st->update_every; + group = available_points / points_requested; + } + + // if the duration is not aligned to resampling time + // extend the duration to the past, to avoid a gap at the chart + // only when the missing duration is above 1/10th of a point + if(duration % resampling_time_requested) { + time_t delta = duration % resampling_time_requested; + if(delta > resampling_time_requested / 10) { + after_requested -= resampling_time_requested - delta; + duration = before_requested - after_requested; + available_points = duration / st->update_every; + group = available_points / points_requested; + } + } + + // the points we should group to satisfy gtime + resampling_group = resampling_time_requested / st->update_every; + if(unlikely(resampling_time_requested % st->update_every)) { + #ifdef NETDATA_INTERNAL_CHECKS + info("INTERNAL CHECK: %s: requested gtime %ld secs, is not a multiple of the chart's data collection frequency %d secs", st->id, resampling_time_requested, st->update_every); + #endif + + resampling_group++; + } + + // adapt group according to resampling_group + if(unlikely(group < resampling_group)) group = resampling_group; // do not allow grouping below the desired one + if(unlikely(group % resampling_group)) group += resampling_group - (group % resampling_group); // make sure group is multiple of resampling_group + + //resampling_divisor = group / resampling_group; + resampling_divisor = (calculated_number)(group * st->update_every) / (calculated_number)resampling_time_requested; + } + + // now that we have group, + // align the requested timeframe to fit it. + + if(aligned) { + // alignement has been requested, so align the values + before_requested -= (before_requested % group); + after_requested -= (after_requested % group); + } + + // we align the request on requested_before + time_t before_wanted = before_requested; + if(likely(before_wanted > last_entry_t)) { + #ifdef NETDATA_INTERNAL_CHECKS + error("INTERNAL ERROR: rrd2rrdr() on %s, before_wanted is after db max", st->name); + #endif + + before_wanted = last_entry_t - (last_entry_t % ( ((aligned)?group:1) * st->update_every )); + } + size_t before_slot = rrdset_time2slot(st, before_wanted); + + // we need to estimate the number of points, for having + // an integer number of values per point + long points_wanted = (before_wanted - after_requested) / (st->update_every * group); + + time_t after_wanted = before_wanted - (points_wanted * group * st->update_every) + st->update_every; + if(unlikely(after_wanted < first_entry_t)) { + // hm... we go to the past, calculate again points_wanted using all the db from before_wanted to the beginning + points_wanted = (before_wanted - first_entry_t) / group; + + // recalculate after wanted with the new number of points + after_wanted = before_wanted - (points_wanted * group * st->update_every) + st->update_every; + + if(unlikely(after_wanted < first_entry_t)) { + #ifdef NETDATA_INTERNAL_CHECKS + error("INTERNAL ERROR: rrd2rrdr() on %s, after_wanted is before db min", st->name); + #endif + + after_wanted = first_entry_t - (first_entry_t % ( ((aligned)?group:1) * st->update_every )) + ( ((aligned)?group:1) * st->update_every ); + } + } + size_t after_slot = rrdset_time2slot(st, after_wanted); + + // check if they are reversed + if(unlikely(after_wanted > before_wanted)) { + #ifdef NETDATA_INTERNAL_CHECKS + error("INTERNAL ERROR: rrd2rrdr() on %s, reversed wanted after/before", st->name); + #endif + time_t tmp = before_wanted; + before_wanted = after_wanted; + after_wanted = tmp; + } + + // recalculate points_wanted using the final time-frame + points_wanted = (before_wanted - after_wanted) / st->update_every / group + 1; + if(unlikely(points_wanted < 0)) { + #ifdef NETDATA_INTERNAL_CHECKS + error("INTERNAL ERROR: rrd2rrdr() on %s, points_wanted is %ld", st->name, points_wanted); + #endif + points_wanted = 0; + } + +#ifdef NETDATA_INTERNAL_CHECKS + duration = before_wanted - after_wanted; + + if(after_wanted < first_entry_t) + error("INTERNAL CHECK: after_wanted %u is too small, minimum %u", (uint32_t)after_wanted, (uint32_t)first_entry_t); + + if(after_wanted > last_entry_t) + error("INTERNAL CHECK: after_wanted %u is too big, maximum %u", (uint32_t)after_wanted, (uint32_t)last_entry_t); + + if(before_wanted < first_entry_t) + error("INTERNAL CHECK: before_wanted %u is too small, minimum %u", (uint32_t)before_wanted, (uint32_t)first_entry_t); + + if(before_wanted > last_entry_t) + error("INTERNAL CHECK: before_wanted %u is too big, maximum %u", (uint32_t)before_wanted, (uint32_t)last_entry_t); + + if(before_slot >= (size_t)st->entries) + error("INTERNAL CHECK: before_slot is invalid %zu, expected 0 to %ld", before_slot, st->entries - 1); + + if(after_slot >= (size_t)st->entries) + error("INTERNAL CHECK: after_slot is invalid %zu, expected 0 to %ld", after_slot, st->entries - 1); + + if(points_wanted > (before_wanted - after_wanted) / group / st->update_every + 1) + error("INTERNAL CHECK: points_wanted %ld is more than points %ld", points_wanted, (before_wanted - after_wanted) / group / st->update_every + 1); + + if(group < resampling_group) + error("INTERNAL CHECK: group %ld is less than the desired group points %ld", group, resampling_group); + + if(group > resampling_group && group % resampling_group) + error("INTERNAL CHECK: group %ld is not a multiple of the desired group points %ld", group, resampling_group); +#endif + + // ------------------------------------------------------------------------- + // initialize our result set + // this also locks the chart for us + + RRDR *r = rrdr_create(st, points_wanted); + if(unlikely(!r)) { + #ifdef NETDATA_INTERNAL_CHECKS + error("INTERNAL CHECK: Cannot create RRDR for %s, after=%u, before=%u, duration=%u, points=%ld", st->id, (uint32_t)after_wanted, (uint32_t)before_wanted, (uint32_t)duration, points_wanted); + #endif + return NULL; + } + + if(unlikely(!r->d || !points_wanted)) { + #ifdef NETDATA_INTERNAL_CHECKS + error("INTERNAL CHECK: Returning empty RRDR (no dimensions in RRDSET) for %s, after=%u, before=%u, duration=%zu, points=%ld", st->id, (uint32_t)after_wanted, (uint32_t)before_wanted, (size_t)duration, points_wanted); + #endif + return r; + } + + if(unlikely(absolute_period_requested == 1)) + r->result_options |= RRDR_RESULT_OPTION_ABSOLUTE; + else + r->result_options |= RRDR_RESULT_OPTION_RELATIVE; + + // find how many dimensions we have + long dimensions_count = r->d; + + // ------------------------------------------------------------------------- + // initialize RRDR + + r->group = group; + r->update_every = (int)group * st->update_every; + r->before = before_wanted; + r->after = after_wanted; + r->internal.points_wanted = points_wanted; + r->internal.resampling_group = resampling_group; + r->internal.resampling_divisor = resampling_divisor; + + + // ------------------------------------------------------------------------- + // assign the processor functions + + { + int i, found = 0; + for(i = 0; !found && api_v1_data_groups[i].name ;i++) { + if(api_v1_data_groups[i].value == group_method) { + r->internal.grouping_create= api_v1_data_groups[i].create; + r->internal.grouping_reset = api_v1_data_groups[i].reset; + r->internal.grouping_free = api_v1_data_groups[i].free; + r->internal.grouping_add = api_v1_data_groups[i].add; + r->internal.grouping_flush = api_v1_data_groups[i].flush; + found = 1; + } + } + if(!found) { + errno = 0; + #ifdef NETDATA_INTERNAL_CHECKS + error("INTERNAL ERROR: grouping method %u not found for chart '%s'. Using 'average'", (unsigned int)group_method, r->st->name); + #endif + r->internal.grouping_create= grouping_create_average; + r->internal.grouping_reset = grouping_reset_average; + r->internal.grouping_free = grouping_free_average; + r->internal.grouping_add = grouping_add_average; + r->internal.grouping_flush = grouping_flush_average; + } + } + + // allocate any memory required by the grouping method + r->internal.grouping_data = r->internal.grouping_create(r); + + + // ------------------------------------------------------------------------- + // disable the not-wanted dimensions + + rrdset_check_rdlock(st); + + if(dimensions) + rrdr_disable_not_selected_dimensions(r, options, dimensions); + + + // ------------------------------------------------------------------------- + // do the work for each dimension + + time_t max_after = 0, min_before = 0; + long max_rows = 0; + + RRDDIM *rd; + long c, dimensions_used = 0, dimensions_nonzero = 0; + for(rd = st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) { + + // if we need a percentage, we need to calculate all dimensions + if(unlikely(!(options & RRDR_OPTION_PERCENTAGE) && (r->od[c] & RRDR_DIMENSION_HIDDEN))) { + if(unlikely(r->od[c] & RRDR_DIMENSION_SELECTED)) r->od[c] &= ~RRDR_DIMENSION_SELECTED; + continue; + } + r->od[c] |= RRDR_DIMENSION_SELECTED; + + // reset the grouping for the new dimension + r->internal.grouping_reset(r); + + do_dimension( + r + , points_wanted + , rd + , c + , after_slot + , before_slot + , after_wanted + , before_wanted + ); + + if(r->od[c] & RRDR_DIMENSION_NONZERO) + dimensions_nonzero++; + + // verify all dimensions are aligned + if(unlikely(!dimensions_used)) { + min_before = r->before; + max_after = r->after; + max_rows = r->rows; + } + else { + if(r->after != max_after) { + #ifdef NETDATA_INTERNAL_CHECKS + error("INTERNAL ERROR: 'after' mismatch between dimensions for chart '%s': max is %zu, dimension '%s' has %zu", + st->name, (size_t)max_after, rd->name, (size_t)r->after); + #endif + r->after = (r->after > max_after) ? r->after : max_after; + } + + if(r->before != min_before) { + #ifdef NETDATA_INTERNAL_CHECKS + error("INTERNAL ERROR: 'before' mismatch between dimensions for chart '%s': max is %zu, dimension '%s' has %zu", + st->name, (size_t)min_before, rd->name, (size_t)r->before); + #endif + r->before = (r->before < min_before) ? r->before : min_before; + } + + if(r->rows != max_rows) { + #ifdef NETDATA_INTERNAL_CHECKS + error("INTERNAL ERROR: 'rows' mismatch between dimensions for chart '%s': max is %zu, dimension '%s' has %zu", + st->name, (size_t)max_rows, rd->name, (size_t)r->rows); + #endif + r->rows = (r->rows > max_rows) ? r->rows : max_rows; + } + } + + dimensions_used++; + } + + #ifdef NETDATA_INTERNAL_CHECKS + + if(r->internal.log) + rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, r->internal.log); + + if(r->rows != points_wanted) + rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "got 'points' is not wanted 'points'"); + + if(aligned && (r->before % group) != 0) + rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "'before' is not aligned but alignment is required"); + + // 'after' should not be aligned, since we start inside the first group + //if(aligned && (r->after % group) != 0) + // rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "'after' is not aligned but alignment is required"); + + if(r->before != before_requested) + rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "chart is not aligned to requested 'before'"); + + if(r->before != before_wanted) + rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "got 'before' is not wanted 'before'"); + + // reported 'after' varies, depending on group + if(r->after != after_wanted) + rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "got 'after' is not wanted 'after'"); + + #endif + + // free all resources used by the grouping method + r->internal.grouping_free(r); + + // when all the dimensions are zero, we should return all of them + if(unlikely(options & RRDR_OPTION_NONZERO && !dimensions_nonzero)) { + // all the dimensions are zero + // mark them as NONZERO to send them all + for(rd = st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) { + if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue; + r->od[c] |= RRDR_DIMENSION_NONZERO; + } + } + + rrdr_query_completed(r->internal.db_points_read, r->internal.result_points_generated); + return r; +} |