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;
        memmove(&vd->backend[u], &vd->backend[u+1], n * sizeof(vd->backend[0]));
        memmove(&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, vd->backend[u], &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);
}

		varnish-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	25	VPFX(lookup)(VRT_CTX, VCL_STRING name)
49		{
50	25	AN(ctx->method & VCL_MET_TASK_H);
51	25	return (VRT_LookupDirector(ctx, name));
52		}
53
54		static void
55	825	vdir_expand(struct vdir *vd, unsigned n)
56		{
57	825	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
58
59	825	vd->backend = realloc(vd->backend, n * sizeof *vd->backend);
60	825	AN(vd->backend);
61	825	vd->weight = realloc(vd->weight, n * sizeof *vd->weight);
62	825	AN(vd->weight);
63	825	if (n > vd->healthy->nbits)
64	0	vbit_expand(vd->healthy, n);
65	825	AN(vd->healthy);
66	825	vd->l_backend = n;
67	825	}
68
69		void
70	900	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	900	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
76	900	CHECK_OBJ_NOTNULL(m, VDI_METHODS_MAGIC);
77	900	AN(vcl_name);
78	900	AN(vdp);
79	900	AZ(*vdp);
80	900	ALLOC_OBJ(vd, VDIR_MAGIC);
81	900	AN(vd);
82	900	*vdp = vd;
83	900	PTOK(pthread_rwlock_init(&vd->mtx, NULL));
84	900	vd->dir = VRT_AddDirector(ctx, m, priv, "%s", vcl_name);
85	900	vd->healthy = vbit_new(8);
86	900	AN(vd->healthy);
87	900	}
88
89		void
90	200	vdir_release(struct vdir *vd)
91		{
92		unsigned u;
93
94	200	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
95
96	200	vdir_wrlock(vd);
97	500	for (u = 0; u < vd->n_backend; u++)
98	300	VRT_Assign_Backend(&vd->backend[u], NULL);
99	200	vd->n_backend = 0;
100	200	vdir_unlock(vd);
101	200	}
102
103		void
104	200	vdir_delete(struct vdir **vdp)
105		{
106		struct vdir *vd;
107
108	200	TAKE_OBJ_NOTNULL(vd, vdp, VDIR_MAGIC);
109
110	200	AZ(vd->dir);
111	200	AZ(vd->n_backend);
112	200	free(vd->backend);
113	200	free(vd->weight);
114	200	PTOK(pthread_rwlock_destroy(&vd->mtx));
115	200	vbit_destroy(vd->healthy);
116	200	FREE_OBJ(vd);
117	200	}
118
119		void
120	3925	vdir_rdlock(struct vdir *vd)
121		{
122	3925	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
123	3925	PTOK(pthread_rwlock_rdlock(&vd->mtx));
124	3925	}
125
126		void
127	4525	vdir_wrlock(struct vdir *vd)
128		{
129	4525	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
130	4525	PTOK(pthread_rwlock_wrlock(&vd->mtx));
131	4525	}
132
133		void
134	8450	vdir_unlock(struct vdir *vd)
135		{
136	8450	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
137	8450	PTOK(pthread_rwlock_unlock(&vd->mtx));
138	8450	}
139
140
141		void
142	2250	vdir_add_backend(VRT_CTX, struct vdir *vd, VCL_BACKEND be, double weight)
143		{
144		unsigned u;
145
146	2250	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
147	2250	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
148	2250	if (be == NULL) {
149	150	VRT_fail(ctx, "%s: None backend cannot be added",
150	75	VRT_BACKEND_string(vd->dir));
151	75	return;
152		}
153	2175	AN(be);
154	2175	vdir_wrlock(vd);
155	2175	if (vd->n_backend >= vd->l_backend)
156	825	vdir_expand(vd, vd->l_backend + 16);
157	2175	assert(vd->n_backend < vd->l_backend);
158	2175	u = vd->n_backend++;
159	2175	vd->backend[u] = NULL;
160	2175	VRT_Assign_Backend(&vd->backend[u], be);
161	2175	vd->weight[u] = weight;
162	2175	vdir_unlock(vd);
163	2250	}
164
165		void
166	300	vdir_remove_backend(VRT_CTX, struct vdir vd, VCL_BACKEND be, unsigned cur)
167		{
168		unsigned u, n;
169
170	300	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
171	300	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
172	300	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	300	CHECK_OBJ(be, DIRECTOR_MAGIC);
178	300	vdir_wrlock(vd);
179	425	for (u = 0; u < vd->n_backend; u++)
180	425	if (vd->backend[u] == be)
181	300	break;
182	300	if (u == vd->n_backend) {
183	0	vdir_unlock(vd);
184	0	return;
185		}
186	300	VRT_Assign_Backend(&vd->backend[u], NULL);
187	300	n = (vd->n_backend - u) - 1;
188	300	memmove(&vd->backend[u], &vd->backend[u+1], n * sizeof(vd->backend[0]));
189	300	memmove(&vd->weight[u], &vd->weight[u+1], n * sizeof(vd->weight[0]));
190	300	vd->n_backend--;
191
192	300	if (cur) {
193	100	assert(*cur <= vd->n_backend);
194	100	if (u < *cur)
195	25	(*cur)--;
196	75	else if (*cur == vd->n_backend)
197	25	*cur = 0;
198	100	}
199	300	vdir_unlock(vd);
200	300	}
201
202		VCL_BOOL
203	1225	vdir_any_healthy(VRT_CTX, struct vdir vd, VCL_TIME changed)
204		{
205	1225	unsigned retval = 0;
206		VCL_BACKEND be;
207		unsigned u;
208		vtim_real c;
209
210	1225	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
211	1225	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
212	1225	vdir_rdlock(vd);
213	1225	if (changed != NULL)
214	250	*changed = 0;
215	1750	for (u = 0; u < vd->n_backend; u++) {
216	1575	be = vd->backend[u];
217	1575	CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
218	1575	retval = VRT_Healthy(ctx, be, &c);
219	1575	if (changed != NULL && c > *changed)
220	325	*changed = c;
221	1575	if (retval)
222	1050	break;
223	525	}
224	1225	vdir_unlock(vd);
225	1225	return (retval);
226		}
227
228		void
229	1300	vdir_list(VRT_CTX, struct vdir vd, struct vsb vsb, int pflag, int jflag,
230		int weight)
231		{
232		VCL_BACKEND be;
233		VCL_BOOL h;
234		unsigned u, nh;
235		double w;
236
237	1300	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
238	1300	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
239
240	1300	if (pflag) {
241	200	if (jflag) {
242	100	VSB_cat(vsb, "{\n");
243	100	VSB_indent(vsb, 2);
244	100	if (weight)
245	50	VSB_printf(vsb, "\"total_weight\": %f,\n",
246	25	vd->total_weight);
247	100	VSB_cat(vsb, "\"backends\": {\n");
248	100	VSB_indent(vsb, 2);
249	100	} else {
250	100	VSB_cat(vsb, "\n\n\tBackend\tWeight\tHealth\n");
251		}
252	200	}
253
254	1300	vdir_rdlock(vd);
255	1300	vdir_update_health(ctx, vd);
256	1850	for (u = 0; pflag && u < vd->n_backend; u++) {
257	550	be = vd->backend[u];
258	550	CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
259
260	550	h = vbit_test(vd->healthy, u);
261
262	550	w = h ? vd->weight[u] : 0.0;
263
264	550	if (jflag) {
265	275	if (u)
266	175	VSB_cat(vsb, ",\n");
267	275	VSB_printf(vsb, "\"%s\": {\n", be->vcl_name);
268	275	VSB_indent(vsb, 2);
269
270	275	if (weight)
271	100	VSB_printf(vsb, "\"weight\": %f,\n", w);
272
273	275	if (h)
274	200	VSB_cat(vsb, "\"health\": \"healthy\"\n");
275		else
276	75	VSB_cat(vsb, "\"health\": \"sick\"\n");
277
278	275	VSB_indent(vsb, -2);
279	275	VSB_cat(vsb, "}");
280	275	} else {
281	275	VSB_cat(vsb, "\t");
282	275	VSB_cat(vsb, be->vcl_name);
283	275	if (weight)
284	200	VSB_printf(vsb, "\t%6.2f%%\t",
285	100	100 * w / vd->total_weight);
286		else
287	175	VSB_cat(vsb, "\t-\t");
288	275	VSB_cat(vsb, h ? "healthy" : "sick");
289	275	VSB_cat(vsb, "\n");
290		}
291	550	}
292	1300	nh = vd->n_healthy;
293	1300	u = vd->n_backend;
294	1300	vdir_unlock(vd);
295
296	1300	if (jflag && (pflag)) {
297	100	VSB_cat(vsb, "\n");
298	100	VSB_indent(vsb, -2);
299	100	VSB_cat(vsb, "}\n");
300	100	VSB_indent(vsb, -2);
301	100	VSB_cat(vsb, "},\n");
302	100	}
303
304	1300	if (pflag)
305	200	return;
306
307	1100	if (jflag)
308	500	VSB_printf(vsb, "[%u, %u, \"%s\"]", nh, u,
309	250	nh ? "healthy" : "sick");
310		else
311	850	VSB_printf(vsb, "%u/%u\t%s", nh, u, nh ? "healthy" : "sick");
312	1300	}
313
314		/*
315		* iterate backends and update
316		* - healthy bitmap
317		* - number of healthy backends
318		* - total_weight
319		* - last change time of the VCL_BACKEND
320		*
321		* must be called under the vdir lock (read or write).
322		*
323		* A write lock is required if consistency between the individual attributes is
324		* a must, e.g. when total_weight is required to be the exact sum of the weights
325		*
326		* The read lock is safe because add_backend expands the healthy bitmap and all
327		* other members are atomic and may be used if consistency is not required.
328		*/
329		void
330	2800	vdir_update_health(VRT_CTX, struct vdir *vd)
331		{
332	2800	VCL_TIME c, changed = 0;
333		VCL_BOOL h;
334		VCL_BACKEND be;
335	2800	unsigned u, nh = 0;
336	2800	double tw = 0.0;
337		struct vbitmap *healthy;
338
339	2800	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
340	2800	healthy = vd->healthy;
341	9350	for (u = 0; u < vd->n_backend; u++) {
342	6550	be = vd->backend[u];
343	6550	CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
344	6550	c = 0;
345	6550	h = VRT_Healthy(ctx, vd->backend[u], &c);
346	6550	if (h) {
347	5075	nh++;
348	5075	tw += vd->weight[u];
349	5075	}
350	6550	if (c > changed)
351	6300	changed = c;
352	6550	if (h != vbit_test(healthy, u)) {
353	3350	if (h)
354	3300	vbit_set(healthy, u);
355		else
356	50	vbit_clr(healthy, u);
357	3350	}
358	6550	}
359	2800	VRT_SetChanged(vd->dir, changed);
360	2800	vd->total_weight = tw;
361	2800	vd->n_healthy = nh;
362	2800	}
363
364		static unsigned
365	1150	vdir_pick_by_weight(const struct vdir *vd, double w)
366		{
367	1150	const struct vbitmap *healthy = vd->healthy;
368	1150	double a = 0.0;
369		unsigned u;
370
371	1150	AN(healthy);
372	1751	for (u = 0; u < vd->n_backend; u++) {
373	1751	if (! vbit_test(healthy, u))
374	100	continue;
375	1651	a += vd->weight[u];
376	1651	if (w < a)
377	1150	return (u);
378	501	}
379	0	WRONG("");
380		}
381
382		VCL_BACKEND
383	1175	vdir_pick_be(VRT_CTX, struct vdir *vd, double w)
384		{
385		unsigned u;
386	1175	VCL_BACKEND be = NULL;
387
388	1175	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
389	1175	CHECK_OBJ_NOTNULL(vd, VDIR_MAGIC);
390	1175	vdir_wrlock(vd);
391	1175	vdir_update_health(ctx, vd);
392	1175	if (vd->total_weight > 0.0) {
393	1150	u = vdir_pick_by_weight(vd, w * vd->total_weight);
394	1150	assert(u < vd->n_backend);
395	1150	be = vd->backend[u];
396	1150	CHECK_OBJ_NOTNULL(be, DIRECTOR_MAGIC);
397	1150	}
398	1175	vdir_unlock(vd);
399	1175	return (be);
400		}