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bson-metrics.c
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bson-metrics.c
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/*
* Copyright 2014 MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* This program will scan each BSON document contained in the provided files
* and print metrics to STDOUT.
*/
#include <bson.h>
#include <stdio.h>
#include <math.h>
#define MAX_RECURSION 100
static double
dtimeofday (void)
{
struct timeval timeval;
bson_gettimeofday(&timeval);
return (timeval.tv_sec + timeval.tv_usec * 0.000001);
}
typedef struct
{
uint64_t count;
char *description;
} bson_type_metrics_t;
typedef struct
{
uint64_t doc_count;
uint64_t element_count;
uint64_t doc_size_max;
uint64_t key_size_tally;
uint64_t utf8_size_tally;
uint32_t depth;
bson_type_metrics_t bson_type_metrics[256];
} bson_metrics_state_t;
static bson_metrics_state_t initial_state = {
0L, 0L, 0L, 0L, 0L, 0L,
{
{ /* BSON_TYPE_EOD = 0x00 */ 0L, "End of document" },
{ /* BSON_TYPE_DOUBLE = 0x01 */ 0L, "Floating point" },
{ /* BSON_TYPE_UTF8 = 0x02 */ 0L, "UTF-8 string" },
{ /* BSON_TYPE_DOCUMENT = 0x03 */ 0L, "Embedded document" },
{ /* BSON_TYPE_ARRAY = 0x04 */ 0L, "Array" },
{ /* BSON_TYPE_BINARY = 0x05 */ 0L, "Binary data" },
{ /* BSON_TYPE_UNDEFINED = 0x06 */ 0L, "Undefined - Deprecated" },
{ /* BSON_TYPE_OID = 0x07 */ 0L, "ObjectId" },
{ /* BSON_TYPE_BOOL = 0x08 */ 0L, "Boolean" },
{ /* BSON_TYPE_DATE_TIME = 0x09 */ 0L, "UTC datetime" },
{ /* BSON_TYPE_NULL = 0x0A */ 0L, "Null value" },
{ /* BSON_TYPE_REGEX = 0x0B */ 0L, "Regular expression" },
{ /* BSON_TYPE_DBPOINTER = 0x0C */ 0L, "DBPointer - Deprecated" },
{ /* BSON_TYPE_CODE = 0x0D */ 0L, "JavaScript code" },
{ /* BSON_TYPE_SYMBOL = 0x0E */ 0L, "Symbol - Deprecated" },
{ /* BSON_TYPE_CODEWSCOPE = 0x0F */ 0L, "JavaScript code w/ scope" },
{ /* BSON_TYPE_INT32 = 0x10 */ 0L, "32-bit Integer" },
{ /* BSON_TYPE_TIMESTAMP = 0x11 */ 0L, "Timestamp" },
{ /* BSON_TYPE_INT64 = 0x12 */ 0L, "64-bit Integer" },
{ 0L, NULL }
}
};
static bson_metrics_state_t state;
static int
compar_bson_type_metrics (const void *a,
const void *b)
{
return (((bson_type_metrics_t*)b)->count - ((bson_type_metrics_t*)a)->count);
}
/*
* Forward declarations.
*/
static bool bson_metrics_visit_array (const bson_iter_t *iter,
const char *key,
const bson_t *v_array,
void *data);
static bool bson_metrics_visit_document (const bson_iter_t *iter,
const char *key,
const bson_t *v_document,
void *data);
static bool
bson_metrics_visit_utf8 (const bson_iter_t *iter,
const char *key,
size_t v_utf8_len,
const char *v_utf8,
void *data)
{
bson_metrics_state_t *state = data;
state->utf8_size_tally += v_utf8_len;
return false;
}
static bool
bson_metrics_visit_before (const bson_iter_t *iter,
const char *key,
void *data)
{
bson_metrics_state_t *state = data;
bson_type_t btype;
++state->element_count;
state->key_size_tally += strlen(key); /* TODO - filter out array keys(?) */
btype = bson_iter_type (iter);
++state->bson_type_metrics[btype].count;
return false;
}
static const bson_visitor_t bson_metrics_visitors = {
bson_metrics_visit_before,
NULL, /* visit_after */
NULL, /* visit_corrupt */
NULL, /* visit_double */
bson_metrics_visit_utf8,
bson_metrics_visit_document,
bson_metrics_visit_array,
NULL, /* visit_binary */
NULL, /* visit_undefined */
NULL, /* visit_oid */
NULL, /* visit_bool */
NULL, /* visit_date_time */
NULL, /* visit_null */
NULL, /* visit_regex */
NULL, /* visit_dbpointer */
NULL, /* visit_code */
NULL, /* visit_symbol */
NULL, /* visit_codewscope */
NULL, /* visit_int32 */
NULL, /* visit_timestamp */
NULL, /* visit_int64 */
NULL, /* visit_maxkey */
NULL, /* visit_minkey */
};
static bool
bson_metrics_visit_document (const bson_iter_t *iter,
const char *key,
const bson_t *v_document,
void *data)
{
bson_metrics_state_t *state = data;
bson_iter_t child;
if (state->depth >= MAX_RECURSION) {
fprintf (stderr, "Invalid document, max recursion reached.\n");
return true;
}
if (bson_iter_init (&child, v_document)) {
state->depth++;
bson_iter_visit_all (&child, &bson_metrics_visitors, data);
state->depth--;
}
return false;
}
static bool
bson_metrics_visit_array (const bson_iter_t *iter,
const char *key,
const bson_t *v_array,
void *data)
{
bson_metrics_state_t *state = data;
bson_iter_t child;
if (state->depth >= MAX_RECURSION) {
fprintf (stderr, "Invalid document, max recursion reached.\n");
return true;
}
if (bson_iter_init (&child, v_array)) {
state->depth++;
bson_iter_visit_all (&child, &bson_metrics_visitors, data);
state->depth--;
}
return false;
}
static void
bson_metrics (const bson_t *bson,
size_t *length,
void *data)
{
bson_metrics_state_t *state = data;
++state->doc_count;
bson_iter_t iter;
if (bson_iter_init (&iter, bson)) {
bson_iter_visit_all (&iter, &bson_metrics_visitors, data);
}
}
int
main (int argc,
char *argv[])
{
bson_reader_t *reader;
const bson_t *b;
bson_error_t error;
const char *filename;
int i, j;
double dtime_before, dtime_after, dtime_delta;
uint64_t aggregate_count;
off_t mark;
/*
* Print program usage if no arguments are provided.
*/
if (argc == 1) {
fprintf(stderr, "usage: %s FILE...\n", argv[0]);
return 1;
}
/*
* Process command line arguments expecting each to be a filename.
*/
printf("[");
for (i = 1; i < argc; i++) {
if (i > 1) printf(",");
filename = argv[i];
/*
* Initialize a new reader for this file descriptor.
*/
if (!(reader = bson_reader_new_from_file (filename, &error))) {
fprintf (stderr, "Failed to open \"%s\": %s\n",
filename, error.message);
continue;
}
state = initial_state;
dtime_before = dtimeofday();
mark = 0;
while ((b = bson_reader_read (reader, NULL))) {
off_t pos = bson_reader_tell(reader);
state.doc_size_max = MAX(pos - mark, state.doc_size_max);
mark = pos;
bson_metrics(b, NULL, &state);
}
dtime_after = dtimeofday();
dtime_delta = MAX(dtime_after - dtime_before, 0.000001);
state.bson_type_metrics[BSON_TYPE_MAXKEY].description = "Max key";
state.bson_type_metrics[BSON_TYPE_MINKEY].description = "Min key";
aggregate_count = state.bson_type_metrics[BSON_TYPE_DOCUMENT].count + state.bson_type_metrics[BSON_TYPE_ARRAY].count;
qsort(state.bson_type_metrics, 256, sizeof(bson_type_metrics_t), compar_bson_type_metrics);
printf("\n {\n");
printf(" \"file\": \"%s\",\n", filename);
printf(" \"secs\": %.2f,\n", dtime_delta);
printf(" \"docs_per_sec\": %"PRIu64",\n", (uint64_t)round(state.doc_count/dtime_delta));
printf(" \"docs\": %"PRIu64",\n", state.doc_count);
printf(" \"elements\": %"PRIu64",\n", state.element_count);
printf(" \"elements_per_doc\": %"PRIu64",\n", (uint64_t)round((double)state.element_count/(double)MAX(state.doc_count, 1)));
printf(" \"aggregates\": %"PRIu64",\n", aggregate_count);
printf(" \"aggregates_per_doc\": %"PRIu64",\n", (uint64_t)round((double)aggregate_count/(double)MAX(state.doc_count, 1)));
printf(" \"degree\": %"PRIu64",\n", (uint64_t)round((double)state.element_count/((double)MAX(state.doc_count + aggregate_count, 1))));
printf(" \"doc_size_max\": %"PRIu64",\n", state.doc_size_max);
printf(" \"doc_size_average\": %"PRIu64",\n", (uint64_t)round((double)bson_reader_tell(reader)/(double)MAX(state.doc_count, 1)));
printf(" \"key_size_average\": %"PRIu64",\n", (uint64_t)round((double)state.key_size_tally/(double)MAX(state.element_count, 1)));
printf(" \"string_size_average\": %"PRIu64",\n", (uint64_t)round((double)state.utf8_size_tally/(double)MAX(state.bson_type_metrics[BSON_TYPE_UTF8].count, 1)));
printf(" \"percent_by_type\": {\n");
for (j = 0; state.bson_type_metrics[j].count > 0; j++) {
bson_type_metrics_t bson_type_metrics = state.bson_type_metrics[j];
printf(" \"%s\": %"PRIu64",\n", bson_type_metrics.description, (uint64_t)round((double)bson_type_metrics.count*100.0/(double)MAX(state.element_count, 1)));
}
printf(" }\n");
printf(" }");
/*
* Cleanup after our reader, which closes the file descriptor.
*/
bson_reader_destroy (reader);
}
printf("\n]\n");
return 0;
}