aboutsummaryrefslogtreecommitdiff
path: root/src/statdict.c
blob: e87123b7fa4530342570cd3d9422f536ff9f40c5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/* This file is part of varnish-mib
   Copyright (C) 2018 Sergey Poznyakoff

   Varnish-mib is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   Varnish-mib is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with varnish-mib.  If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <inttypes.h>
#include <string.h>
#include <vapi/vsc.h>
#include <vapi/vsm.h>
#include <vas.h>
#include <vcli.h>
#include "backend.h"

static size_t hash_size[] = {
	7, 17, 37, 101, 229, 487, 1009, 2039, 4091, 8191, 16411
};
static size_t hash_num = 0;
static struct VSC_point **dict;

#define SIZE_T_MAX ((size_t)-1)

static inline size_t
rotl(size_t x, int n)
{
	return ((x << n) | (x >> ((CHAR_BIT * sizeof x) - n))) & SIZE_T_MAX;
}

static size_t
hash(const char *str)
{
	size_t value = 0;
	unsigned char ch;
	
	while ((ch = *str++))
		value = ch + rotl(value, 7);
	return value % hash_size[hash_num];
}

struct VSC_point **lookup(const char *name, int install);

static void
rehash(void)
{
	struct VSC_point **old_dict = dict;
	size_t old_size = hash_size[hash_num];
	size_t i;
	
	++hash_num;
	AN(hash_num < sizeof(hash_size) / sizeof(hash_size[0]));
	dict = calloc(hash_size[hash_num], sizeof(dict[0]));
	AN(dict);
	
	for (i = 0; i < old_size; i++) {
		if (old_dict[i])
			*lookup(old_dict[i]->name, 1) = old_dict[i];
	}
	free(old_dict);
}

struct VSC_point **
lookup(const char *name, int install)
{
	size_t i, pos;

	if (!dict) {
		if (install) {
			dict = calloc(hash_size[hash_num], sizeof(dict[0]));
			AN(dict);
		} else
			return NULL;
	}
	
	pos = hash(name);

	for (i = pos; dict[i];) {
		if (strcmp(dict[i]->name, name) == 0) {
			return &dict[i];
		}

		if (++i >= hash_size[hash_num])
			i = 0;
		if (i == pos)
			break;
	}

        if (!install)
		return NULL;

	if (!dict[i])
		return &dict[i];

	rehash();
	return lookup(name, install);
}

int
dict_lookup(char const *key, uint64_t *val)
{
	struct VSC_point **ent;

	ent = lookup(key, 0);
	if (!ent) {
		fprintf(stderr, "%s NOT FOUND\n", key);
	}
	if (!ent)
		return -1;
	*val = *(uint64_t*)(*ent)->ptr;
	return 0;
}

void
dict_clear(void)
{
	if (dict) {
		size_t i;
		for (i = 0; i < hash_size[hash_num]; i++)
			if (dict[i])
				VSC_Destroy_Point(&dict[i]);
	}
}

struct VSC_point const *
dict_install(struct VSC_point const *pt)
{
	struct VSC_point **ent;

	ent = lookup(pt->name, 1);
	AN(ent);
	if (*ent)
		VSC_Destroy_Point(ent);
	*ent = VSC_Clone_Point(pt);
	return *ent;
}

static int
load_cb(void *priv, const struct VSC_point *vpt)
{
	AZ(strcmp(vpt->ctype, "uint64_t"));
	vpt = dict_install(vpt);
	if (strncmp(vpt->name, "VBE.", 4) == 0) {
		char const *name = vpt->name + 4;
		char *p = strrchr(name, '.');
		if (p) {
			backend_register(name, p - name, p + 1, vpt);
		}
	}
	return 0;
}

void
dict_load(struct vsc *vsc)
{
	struct vsm_fantom fantom = VSM_FANTOM_NULL;
	dict_clear();
	backend_clear();
	VSC_Iter(vsc, &fantom, load_cb, NULL);
	backend_collect_addr();
}

Return to:

Send suggestions and report system problems to the System administrator.