X-Git-Url: https://git.tokkee.org/?p=sysdb.git;a=blobdiff_plain;f=src%2Fcore%2Fstore_json.c;fp=src%2Fcore%2Fstore_json.c;h=d9fc37c4b30d498b3340fce1b238b177f57ad95d;hp=0000000000000000000000000000000000000000;hb=7e192f00497c9837856530d2ca5559ec86715502;hpb=794d7a5a42401a5bf0645b36162c3d05fbd81a99 diff --git a/src/core/store_json.c b/src/core/store_json.c new file mode 100644 index 0000000..d9fc37c --- /dev/null +++ b/src/core/store_json.c @@ -0,0 +1,241 @@ +/* + * SysDB - src/core/store_json.c + * Copyright (C) 2013-2014 Sebastian 'tokkee' Harl + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * This module implements JSON support. + */ + +#if HAVE_CONFIG_H +# include "config.h" +#endif /* HAVE_CONFIG_H */ + +#include "sysdb.h" +#include "core/store-private.h" +#include "utils/error.h" + +#include + +#include + +/* + * private data types + */ + +struct sdb_store_json_formatter { + sdb_strbuf_t *buf; + + /* The context describes the state of the formatter through + * the path pointing to the current object */ + int context[8]; + size_t current; +}; + +/* + * private helper functions + */ + +static int +json_emit(sdb_store_json_formatter_t *f, sdb_store_obj_t *obj) +{ + char time_str[64]; + char interval_str[64]; + size_t i; + + assert(f && obj); + + sdb_strbuf_append(f->buf, "{\"name\": \"%s\", ", SDB_OBJ(obj)->name); + if (obj->type == SDB_ATTRIBUTE) { + char tmp[sdb_data_strlen(&ATTR(obj)->value) + 1]; + if (sdb_data_format(&ATTR(obj)->value, tmp, sizeof(tmp), + SDB_DOUBLE_QUOTED) < 0) + snprintf(tmp, sizeof(tmp), ""); + sdb_strbuf_append(f->buf, "\"value\": %s, ", tmp); + } + + /* TODO: make time and interval formats configurable */ + if (! sdb_strftime(time_str, sizeof(time_str), + "%F %T %z", obj->last_update)) + snprintf(time_str, sizeof(time_str), ""); + time_str[sizeof(time_str) - 1] = '\0'; + + if (! sdb_strfinterval(interval_str, sizeof(interval_str), + obj->interval)) + snprintf(interval_str, sizeof(interval_str), ""); + interval_str[sizeof(interval_str) - 1] = '\0'; + + sdb_strbuf_append(f->buf, "\"last_update\": \"%s\", " + "\"update_interval\": \"%s\", \"backends\": [", + time_str, interval_str); + + for (i = 0; i < obj->backends_num; ++i) { + sdb_strbuf_append(f->buf, "\"%s\"", obj->backends[i]); + if (i < obj->backends_num - 1) + sdb_strbuf_append(f->buf, ","); + } + sdb_strbuf_append(f->buf, "]"); + return 0; +} /* json_emit */ + +/* + * public API + */ + +sdb_store_json_formatter_t * +sdb_store_json_formatter(sdb_strbuf_t *buf) +{ + sdb_store_json_formatter_t *f; + + if (! buf) + return NULL; + + f = calloc(1, sizeof(*f)); + if (! f) + return NULL; + + f->buf = buf; + f->context[0] = 0; + f->current = 0; + return f; +} /* sdb_store_json_formatter */ + +int +sdb_store_json_emit(sdb_store_json_formatter_t *f, sdb_store_obj_t *obj) +{ + if ((! f) || (! obj)) + return -1; + + /* first host */ + if (! f->context[0]) { + assert(f->current == 0); + f->context[0] = SDB_HOST; + return json_emit(f, obj); + } + + if (obj->type == f->context[f->current]) { + /* new entry of the same type */ + sdb_strbuf_append(f->buf, "},"); + } + else if ((f->context[f->current] == SDB_HOST) + || (obj->type == SDB_ATTRIBUTE)) { + assert(obj->type != SDB_HOST); + /* all object types may be children of a host; + * attributes may be children of any type */ + sdb_strbuf_append(f->buf, ", \"%ss\": [", + SDB_STORE_TYPE_TO_NAME(obj->type)); + ++f->current; + } + else if (f->current >= 1) { + /* new entry of a previous type or a new type on the same level + * -> rewind to the right state and then handle the new object */ + assert(obj->type != SDB_ATTRIBUTE); + while (f->current > 0) { + if (f->context[f->current] == obj->type) + break; + assert(f->context[f->current] != SDB_HOST); + sdb_strbuf_append(f->buf, "}]"); + --f->current; + } + return sdb_store_json_emit(f, obj); + } + else { + sdb_log(SDB_LOG_ERR, "store: Unexpected object of type %s " + "on level %zu during JSON serialization", + SDB_STORE_TYPE_TO_NAME(obj->type), f->current); + return -1; + } + + json_emit(f, obj); + assert(f->current < SDB_STATIC_ARRAY_LEN(f->context)); + f->context[f->current] = obj->type; + return 0; +} /* sdb_store_json_emit */ + +int +sdb_store_json_emit_full(sdb_store_json_formatter_t *f, sdb_store_obj_t *obj, + sdb_store_matcher_t *filter) +{ + sdb_avltree_t *trees[] = { NULL, NULL, NULL }; + size_t i; + + if (sdb_store_json_emit(f, obj)) + return -1; + + if (obj->type == SDB_HOST) { + trees[0] = HOST(obj)->attributes; + trees[1] = HOST(obj)->metrics; + trees[2] = HOST(obj)->services; + } + else if (obj->type == SDB_SERVICE) + trees[0] = SVC(obj)->attributes; + else if (obj->type == SDB_METRIC) + trees[0] = METRIC(obj)->attributes; + else if (obj->type == SDB_ATTRIBUTE) + return 0; + else + return -1; + + for (i = 0; i < SDB_STATIC_ARRAY_LEN(trees); ++i) { + sdb_avltree_iter_t *iter; + + if (! trees[i]) + continue; + + iter = sdb_avltree_get_iter(trees[i]); + while (sdb_avltree_iter_has_next(iter)) { + sdb_store_obj_t *child; + child = STORE_OBJ(sdb_avltree_iter_get_next(iter)); + + if (filter && (! sdb_store_matcher_matches(filter, child, NULL))) + continue; + + if (sdb_store_json_emit_full(f, child, filter)) { + sdb_avltree_iter_destroy(iter); + return -1; + } + } + sdb_avltree_iter_destroy(iter); + } + return 0; +} /* sdb_store_json_emit_full */ + +int +sdb_store_json_finish(sdb_store_json_formatter_t *f) +{ + if (! f) + return -1; + + while (f->current > 0) { + sdb_strbuf_append(f->buf, "}]"); + --f->current; + } + if (f->context[0]) + sdb_strbuf_append(f->buf, "}"); + return 0; +} /* sdb_store_json_finish */ + +/* vim: set tw=78 sw=4 ts=4 noexpandtab : */ +