GCOV - Varnish Cache


/*-
 * Copyright (c) 2013-2015 Varnish Software AS
 * Copyright 2019 UPLEX - Nils Goroll Systemoptimierung
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@FreeBSD.org>
 * Author: Nils Goroll <nils.goroll@uplex.de>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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 AUTHOR 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 AUTHOR 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.
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>

#include "cache/cache.h"

#include "vbm.h"
#include "vcl.h"
#include "vsb.h"

#include "vcc_directors_if.h"

#include "vmod_directors.h"

VCL_BACKEND
VPFX(lookup)(VRT_CTX, VCL_STRING name)
{
        AN(ctx->method & VCL_MET_TASK_H);
        return (VRT_LookupDirector(ctx, name));
}

static void
vdir_expand(struct vdir *vd, unsigned n)
{
        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);

        vd->backend = realloc(vd->backend, n * sizeof *vd->backend);
        AN(vd->backend);
        vd->weight = realloc(vd->weight, n * sizeof *vd->weight);
        AN(vd->weight);
        if (n > vd->healthy->nbits)
                vbit_expand(vd->healthy, n);
        AN(vd->healthy);
        vd->l_backend = n;
}

void
vdir_new(VRT_CTX, struct vdir **vdp, const char *vcl_name,
    const struct vdi_methods *m, void *priv)
{
        struct vdir *vd;

        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(m, VDI_METHODS_MAGIC);
        AN(vcl_name);
        AN(vdp);
        AZ(*vdp);
        ALLOC_OBJ(vd, VDIR_MAGIC);
        AN(vd);
        *vdp = vd;
        PTOK(pthread_rwlock_init(&vd->mtx, NULL));
        vd->dir = VRT_AddDirector(ctx, m, priv, "%s", vcl_name);
        vd->healthy = vbit_new(8);
        AN(vd->healthy);
}

void
vdir_release(struct vdir *vd)
{
        unsigned u;

        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);

        vdir_wrlock(vd);
        for (u = 0; u < vd->n_backend; u++)
                VRT_Assign_Backend(&vd->backend[u], NULL);
        vd->n_backend = 0;
        vdir_unlock(vd);
}

void
vdir_delete(struct vdir **vdp)
{
        struct vdir *vd;

        TAKE_OBJ_NOTNULL(vd, vdp, VDIR_MAGIC);

        AZ(vd->dir);
        AZ(vd->n_backend);
        free(vd->backend);
        free(vd->weight);
        PTOK(pthread_rwlock_destroy(&vd->mtx));
        vbit_destroy(vd->healthy);
        FREE_OBJ(vd);
}

void
vdir_rdlock(struct vdir *vd)
{
        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
        PTOK(pthread_rwlock_rdlock(&vd->mtx));
}

void
vdir_wrlock(struct vdir *vd)
{
        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
        PTOK(pthread_rwlock_wrlock(&vd->mtx));
}

void
vdir_unlock(struct vdir *vd)
{
        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
        PTOK(pthread_rwlock_unlock(&vd->mtx));
}


void
vdir_add_backend(VRT_CTX, struct vdir *vd, VCL_BACKEND be, double weight)
{
        unsigned u;

        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
        if (be == NULL) {
                VRT_fail(ctx, "%s: None backend cannot be added",
                    VRT_BACKEND_string(vd->dir));
                return;
        }
        AN(be);
        vdir_wrlock(vd);
        if (vd->n_backend >= vd->l_backend)
                vdir_expand(vd, vd->l_backend + 16);
        assert(vd->n_backend < vd->l_backend);
        u = vd->n_backend++;
        vd->backend[u] = NULL;
        VRT_Assign_Backend(&vd->backend[u], be);
        vd->weight[u] = weight;
        vdir_unlock(vd);
}

void
vdir_remove_backend(VRT_CTX, struct vdir *vd, VCL_BACKEND be, unsigned *cur)
{
        unsigned u, n;

        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
        if (be == NULL) {
                VRT_fail(ctx, "%s: None backend cannot be removed",
                    VRT_BACKEND_string(vd->dir));
                return;
        }
        CHECK_OBJ(be, DIRECTOR_MAGIC);
        vdir_wrlock(vd);
        for (u = 0; u < vd->n_backend; u++)
                if (vd->backend[u] == be)
                        break;
        if (u == vd->n_backend) {
                vdir_unlock(vd);
                return;
        }
        VRT_Assign_Backend(&vd->backend[u], NULL);
        n = (vd->n_backend - u) - 1;
        vmemmove(&vd->backend[u], &vd->backend[u + 1],
                 n * sizeof(vd->backend[0]));
        vmemmove(&vd->weight[u], &vd->weight[u + 1],
                 n * sizeof(vd->weight[0]));
        vd->n_backend--;

        if (cur) {
                assert(*cur <= vd->n_backend);
                if (u < *cur)
                        (*cur)--;
                else if (*cur == vd->n_backend)
                        *cur = 0;
        }
        vdir_unlock(vd);
}

VCL_BOOL
vdir_any_healthy(VRT_CTX, struct vdir *vd, VCL_TIME *changed)
{
        unsigned retval = 0;
        VCL_BACKEND be;
        unsigned u;
        vtim_real c;

        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
        vdir_rdlock(vd);
        if (changed != NULL)
                *changed = 0;
        for (u = 0; u < vd->n_backend; u++) {
                be = vd->backend[u];
                CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
                retval = VRT_Healthy(ctx, be, &c);
                if (changed != NULL && c > *changed)
                        *changed = c;
                if (retval)
                        break;
        }
        vdir_unlock(vd);
        return (retval);
}

void
vdir_list(VRT_CTX, struct vdir *vd, struct vsb *vsb, int pflag, int jflag,
    int weight)
{
        VCL_BACKEND be;
        VCL_BOOL h;
        unsigned u, nh;
        double w;

        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);

        if (pflag) {
                if (jflag) {
                        VSB_cat(vsb, "{\n");
                        VSB_indent(vsb, 2);
                        if (weight)
                                VSB_printf(vsb, "\"total_weight\": %f,\n",
                                    vd->total_weight);
                        VSB_cat(vsb, "\"backends\": {\n");
                        VSB_indent(vsb, 2);
                } else {
                        VSB_cat(vsb, "\n\n\tBackend\tWeight\tHealth\n");
                }
        }

        vdir_rdlock(vd);
        vdir_update_health(ctx, vd);
        for (u = 0; pflag && u < vd->n_backend; u++) {
                be = vd->backend[u];
                CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);

                h = vbit_test(vd->healthy, u);

                w = h ? vd->weight[u] : 0.0;

                if (jflag) {
                        if (u)
                                VSB_cat(vsb, ",\n");
                        VSB_printf(vsb, "\"%s\": {\n", be->vcl_name);
                        VSB_indent(vsb, 2);

                        if (weight)
                                VSB_printf(vsb, "\"weight\": %f,\n", w);

                        if (h)
                                VSB_cat(vsb, "\"health\": \"healthy\"\n");
                        else
                                VSB_cat(vsb, "\"health\": \"sick\"\n");

                        VSB_indent(vsb, -2);
                        VSB_cat(vsb, "}");
                } else {
                        VSB_cat(vsb, "\t");
                        VSB_cat(vsb, be->vcl_name);
                        if (weight)
                                VSB_printf(vsb, "\t%6.2f%%\t",
                                    100 * w / vd->total_weight);
                        else
                                VSB_cat(vsb, "\t-\t");
                        VSB_cat(vsb, h ? "healthy" : "sick");
                        VSB_cat(vsb, "\n");
                }
        }
        nh = vd->n_healthy;
        u = vd->n_backend;
        vdir_unlock(vd);

        if (jflag && (pflag)) {
                VSB_cat(vsb, "\n");
                VSB_indent(vsb, -2);
                VSB_cat(vsb, "}\n");
                VSB_indent(vsb, -2);
                VSB_cat(vsb, "},\n");
        }

        if (pflag)
                return;

        if (jflag)
                VSB_printf(vsb, "[%u, %u, \"%s\"]", nh, u,
                    nh ? "healthy" : "sick");
        else
                VSB_printf(vsb, "%u/%u\t%s", nh, u, nh ? "healthy" : "sick");
}

/*
 * iterate backends and update
 * - healthy bitmap
 * - number of healthy backends
 * - total_weight
 * - last change time of the VCL_BACKEND
 *
 * must be called under the vdir lock (read or write).
 *
 * A write lock is required if consistency between the individual attributes is
 * a must, e.g. when total_weight is required to be the exact sum of the weights
 *
 * The read lock is safe because add_backend expands the healthy bitmap and all
 * other members are atomic and may be used if consistency is not required.
 */
void
vdir_update_health(VRT_CTX, struct vdir *vd)
{
        VCL_TIME c, changed = 0;
        VCL_BOOL h;
        VCL_BACKEND be;
        unsigned u, nh = 0;
        double tw = 0.0;
        struct vbitmap *healthy;

        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
        healthy = vd->healthy;
        for (u = 0; u < vd->n_backend; u++) {
                be = vd->backend[u];
                CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
                c = 0;
                h = VRT_Healthy(ctx, be, &c);
                if (h) {
                        nh++;
                        tw += vd->weight[u];
                }
                if (c > changed)
                        changed = c;
                if (h != vbit_test(healthy, u)) {
                        if (h)
                                vbit_set(healthy, u);
                        else
                                vbit_clr(healthy, u);
                }
        }
        VRT_SetChanged(vd->dir, changed);
        vd->total_weight = tw;
        vd->n_healthy = nh;
}

static unsigned
vdir_pick_by_weight(const struct vdir *vd, double w)
{
        const struct vbitmap *healthy = vd->healthy;
        double a = 0.0;
        unsigned u;

        AN(healthy);
        for (u = 0; u < vd->n_backend; u++) {
                if (! vbit_test(healthy, u))
                        continue;
                a += vd->weight[u];
                if (w < a)
                        return (u);
        }
        WRONG("");
}

VCL_BACKEND
vdir_pick_be(VRT_CTX, struct vdir *vd, double w)
{
        unsigned u;
        VCL_BACKEND be = NULL;

        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
        CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
        vdir_wrlock(vd);
        vdir_update_health(ctx, vd);
        if (vd->total_weight > 0.0) {
                u = vdir_pick_by_weight(vd, w * vd->total_weight);
                assert(u < vd->n_backend);
                be = vd->backend[u];
                CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
        }
        vdir_unlock(vd);
        return (be);
}

		vinyl-cache/vmod/vmod_directors.c
0		/*-
1		* Copyright (c) 2013-2015 Varnish Software AS
2		* Copyright 2019 UPLEX - Nils Goroll Systemoptimierung
3		* All rights reserved.
4		*
5		* Author: Poul-Henning Kamp <phk@FreeBSD.org>
6		* Author: Nils Goroll <nils.goroll@uplex.de>
7		*
8		* SPDX-License-Identifier: BSD-2-Clause
9		*
10		* Redistribution and use in source and binary forms, with or without
11		* modification, are permitted provided that the following conditions
12		* are met:
13		* 1. Redistributions of source code must retain the above copyright
14		* notice, this list of conditions and the following disclaimer.
15		* 2. Redistributions in binary form must reproduce the above copyright
16		* notice, this list of conditions and the following disclaimer in the
17		* documentation and/or other materials provided with the distribution.
18		*
19		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
23		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29		* SUCH DAMAGE.
30		*/
31
32		#include "config.h"
33
34		#include <stdlib.h>
35		#include <stdio.h>
36
37		#include "cache/cache.h"
38
39		#include "vbm.h"
40		#include "vcl.h"
41		#include "vsb.h"
42
43		#include "vcc_directors_if.h"
44
45		#include "vmod_directors.h"
46
47		VCL_BACKEND
48	4	VPFX(lookup)(VRT_CTX, VCL_STRING name)
49		{
50	4	AN(ctx->method & VCL_MET_TASK_H);
51	4	return (VRT_LookupDirector(ctx, name));
52		}
53
54		static void
55	132	vdir_expand(struct vdir *vd, unsigned n)
56		{
57	132	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
58
59	132	vd->backend = realloc(vd->backend, n * sizeof *vd->backend);
60	132	AN(vd->backend);
61	132	vd->weight = realloc(vd->weight, n * sizeof *vd->weight);
62	132	AN(vd->weight);
63	132	if (n > vd->healthy->nbits)
64	0	vbit_expand(vd->healthy, n);
65	132	AN(vd->healthy);
66	132	vd->l_backend = n;
67	132	}
68
69		void
70	144	vdir_new(VRT_CTX, struct vdir *vdp, const char vcl_name,
71		const struct vdi_methods m, void priv)
72		{
73		struct vdir *vd;
74
75	144	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
76	144	CHECK_OBJ_NOTNULL(m, VDI_METHODS_MAGIC);
77	144	AN(vcl_name);
78	144	AN(vdp);
79	144	AZ(*vdp);
80	144	ALLOC_OBJ(vd, VDIR_MAGIC);
81	144	AN(vd);
82	144	*vdp = vd;
83	144	PTOK(pthread_rwlock_init(&vd->mtx, NULL));
84	144	vd->dir = VRT_AddDirector(ctx, m, priv, "%s", vcl_name);
85	144	vd->healthy = vbit_new(8);
86	144	AN(vd->healthy);
87	144	}
88
89		void
90	32	vdir_release(struct vdir *vd)
91		{
92		unsigned u;
93
94	32	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
95
96	32	vdir_wrlock(vd);
97	80	for (u = 0; u < vd->n_backend; u++)
98	48	VRT_Assign_Backend(&vd->backend[u], NULL);
99	32	vd->n_backend = 0;
100	32	vdir_unlock(vd);
101	32	}
102
103		void
104	32	vdir_delete(struct vdir **vdp)
105		{
106		struct vdir *vd;
107
108	32	TAKE_OBJ_NOTNULL(vd, vdp, VDIR_MAGIC);
109
110	32	AZ(vd->dir);
111	32	AZ(vd->n_backend);
112	32	free(vd->backend);
113	32	free(vd->weight);
114	32	PTOK(pthread_rwlock_destroy(&vd->mtx));
115	32	vbit_destroy(vd->healthy);
116	32	FREE_OBJ(vd);
117	32	}
118
119		void
120	628	vdir_rdlock(struct vdir *vd)
121		{
122	628	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
123	628	PTOK(pthread_rwlock_rdlock(&vd->mtx));
124	628	}
125
126		void
127	724	vdir_wrlock(struct vdir *vd)
128		{
129	724	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
130	724	PTOK(pthread_rwlock_wrlock(&vd->mtx));
131	724	}
132
133		void
134	1352	vdir_unlock(struct vdir *vd)
135		{
136	1352	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
137	1352	PTOK(pthread_rwlock_unlock(&vd->mtx));
138	1352	}
139
140
141		void
142	360	vdir_add_backend(VRT_CTX, struct vdir *vd, VCL_BACKEND be, double weight)
143		{
144		unsigned u;
145
146	360	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
147	360	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
148	360	if (be == NULL) {
149	24	VRT_fail(ctx, "%s: None backend cannot be added",
150	12	VRT_BACKEND_string(vd->dir));
151	12	return;
152		}
153	348	AN(be);
154	348	vdir_wrlock(vd);
155	348	if (vd->n_backend >= vd->l_backend)
156	132	vdir_expand(vd, vd->l_backend + 16);
157	348	assert(vd->n_backend < vd->l_backend);
158	348	u = vd->n_backend++;
159	348	vd->backend[u] = NULL;
160	348	VRT_Assign_Backend(&vd->backend[u], be);
161	348	vd->weight[u] = weight;
162	348	vdir_unlock(vd);
163	360	}
164
165		void
166	48	vdir_remove_backend(VRT_CTX, struct vdir vd, VCL_BACKEND be, unsigned cur)
167		{
168		unsigned u, n;
169
170	48	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
171	48	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
172	48	if (be == NULL) {
173	0	VRT_fail(ctx, "%s: None backend cannot be removed",
174	0	VRT_BACKEND_string(vd->dir));
175	0	return;
176		}
177	48	CHECK_OBJ(be, DIRECTOR_MAGIC);
178	48	vdir_wrlock(vd);
179	68	for (u = 0; u < vd->n_backend; u++)
180	68	if (vd->backend[u] == be)
181	48	break;
182	48	if (u == vd->n_backend) {
183	0	vdir_unlock(vd);
184	0	return;
185		}
186	48	VRT_Assign_Backend(&vd->backend[u], NULL);
187	48	n = (vd->n_backend - u) - 1;
188	48	vmemmove(&vd->backend[u], &vd->backend[u + 1],
189		n * sizeof(vd->backend[0]));
190	48	vmemmove(&vd->weight[u], &vd->weight[u + 1],
191		n * sizeof(vd->weight[0]));
192	48	vd->n_backend--;
193
194	48	if (cur) {
195	16	assert(*cur <= vd->n_backend);
196	16	if (u < *cur)
197	4	(*cur)--;
198	12	else if (*cur == vd->n_backend)
199	4	*cur = 0;
200	16	}
201	48	vdir_unlock(vd);
202	48	}
203
204		VCL_BOOL
205	196	vdir_any_healthy(VRT_CTX, struct vdir vd, VCL_TIME changed)
206		{
207	196	unsigned retval = 0;
208		VCL_BACKEND be;
209		unsigned u;
210		vtim_real c;
211
212	196	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
213	196	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
214	196	vdir_rdlock(vd);
215	196	if (changed != NULL)
216	40	*changed = 0;
217	280	for (u = 0; u < vd->n_backend; u++) {
218	252	be = vd->backend[u];
219	252	CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
220	252	retval = VRT_Healthy(ctx, be, &c);
221	252	if (changed != NULL && c > *changed)
222	52	*changed = c;
223	252	if (retval)
224	168	break;
225	84	}
226	196	vdir_unlock(vd);
227	196	return (retval);
228		}
229
230		void
231	208	vdir_list(VRT_CTX, struct vdir vd, struct vsb vsb, int pflag, int jflag,
232		int weight)
233		{
234		VCL_BACKEND be;
235		VCL_BOOL h;
236		unsigned u, nh;
237		double w;
238
239	208	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
240	208	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
241
242	208	if (pflag) {
243	32	if (jflag) {
244	16	VSB_cat(vsb, "{\n");
245	16	VSB_indent(vsb, 2);
246	16	if (weight)
247	8	VSB_printf(vsb, "\"total_weight\": %f,\n",
248	4	vd->total_weight);
249	16	VSB_cat(vsb, "\"backends\": {\n");
250	16	VSB_indent(vsb, 2);
251	16	} else {
252	16	VSB_cat(vsb, "\n\n\tBackend\tWeight\tHealth\n");
253		}
254	32	}
255
256	208	vdir_rdlock(vd);
257	208	vdir_update_health(ctx, vd);
258	296	for (u = 0; pflag && u < vd->n_backend; u++) {
259	88	be = vd->backend[u];
260	88	CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
261
262	88	h = vbit_test(vd->healthy, u);
263
264	88	w = h ? vd->weight[u] : 0.0;
265
266	88	if (jflag) {
267	44	if (u)
268	28	VSB_cat(vsb, ",\n");
269	44	VSB_printf(vsb, "\"%s\": {\n", be->vcl_name);
270	44	VSB_indent(vsb, 2);
271
272	44	if (weight)
273	16	VSB_printf(vsb, "\"weight\": %f,\n", w);
274
275	44	if (h)
276	32	VSB_cat(vsb, "\"health\": \"healthy\"\n");
277		else
278	12	VSB_cat(vsb, "\"health\": \"sick\"\n");
279
280	44	VSB_indent(vsb, -2);
281	44	VSB_cat(vsb, "}");
282	44	} else {
283	44	VSB_cat(vsb, "\t");
284	44	VSB_cat(vsb, be->vcl_name);
285	44	if (weight)
286	32	VSB_printf(vsb, "\t%6.2f%%\t",
287	16	100 * w / vd->total_weight);
288		else
289	28	VSB_cat(vsb, "\t-\t");
290	44	VSB_cat(vsb, h ? "healthy" : "sick");
291	44	VSB_cat(vsb, "\n");
292		}
293	88	}
294	208	nh = vd->n_healthy;
295	208	u = vd->n_backend;
296	208	vdir_unlock(vd);
297
298	208	if (jflag && (pflag)) {
299	16	VSB_cat(vsb, "\n");
300	16	VSB_indent(vsb, -2);
301	16	VSB_cat(vsb, "}\n");
302	16	VSB_indent(vsb, -2);
303	16	VSB_cat(vsb, "},\n");
304	16	}
305
306	208	if (pflag)
307	32	return;
308
309	176	if (jflag)
310	80	VSB_printf(vsb, "[%u, %u, \"%s\"]", nh, u,
311	40	nh ? "healthy" : "sick");
312		else
313	136	VSB_printf(vsb, "%u/%u\t%s", nh, u, nh ? "healthy" : "sick");
314	208	}
315
316		/*
317		* iterate backends and update
318		* - healthy bitmap
319		* - number of healthy backends
320		* - total_weight
321		* - last change time of the VCL_BACKEND
322		*
323		* must be called under the vdir lock (read or write).
324		*
325		* A write lock is required if consistency between the individual attributes is
326		* a must, e.g. when total_weight is required to be the exact sum of the weights
327		*
328		* The read lock is safe because add_backend expands the healthy bitmap and all
329		* other members are atomic and may be used if consistency is not required.
330		*/
331		void
332	448	vdir_update_health(VRT_CTX, struct vdir *vd)
333		{
334	448	VCL_TIME c, changed = 0;
335		VCL_BOOL h;
336		VCL_BACKEND be;
337	448	unsigned u, nh = 0;
338	448	double tw = 0.0;
339		struct vbitmap *healthy;
340
341	448	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
342	448	healthy = vd->healthy;
343	1496	for (u = 0; u < vd->n_backend; u++) {
344	1048	be = vd->backend[u];
345	1048	CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
346	1048	c = 0;
347	1048	h = VRT_Healthy(ctx, be, &c);
348	1048	if (h) {
349	812	nh++;
350	812	tw += vd->weight[u];
351	812	}
352	1048	if (c > changed)
353	1008	changed = c;
354	1048	if (h != vbit_test(healthy, u)) {
355	536	if (h)
356	528	vbit_set(healthy, u);
357		else
358	8	vbit_clr(healthy, u);
359	536	}
360	1048	}
361	448	VRT_SetChanged(vd->dir, changed);
362	448	vd->total_weight = tw;
363	448	vd->n_healthy = nh;
364	448	}
365
366		static unsigned
367	184	vdir_pick_by_weight(const struct vdir *vd, double w)
368		{
369	184	const struct vbitmap *healthy = vd->healthy;
370	184	double a = 0.0;
371		unsigned u;
372
373	184	AN(healthy);
374	280	for (u = 0; u < vd->n_backend; u++) {
375	280	if (! vbit_test(healthy, u))
376	16	continue;
377	264	a += vd->weight[u];
378	264	if (w < a)
379	184	return (u);
380	80	}
381	0	WRONG("");
382		}
383
384		VCL_BACKEND
385	188	vdir_pick_be(VRT_CTX, struct vdir *vd, double w)
386		{
387		unsigned u;
388	188	VCL_BACKEND be = NULL;
389
390	188	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
391	188	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
392	188	vdir_wrlock(vd);
393	188	vdir_update_health(ctx, vd);
394	188	if (vd->total_weight > 0.0) {
395	184	u = vdir_pick_by_weight(vd, w * vd->total_weight);
396	184	assert(u < vd->n_backend);
397	184	be = vd->backend[u];
398	184	CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
399	184	}
400	188	vdir_unlock(vd);
401	188	return (be);
402		}