[collectd] [PATCH] Ceph plugin
Yves Mettier
ymettier at free.fr
Tue Oct 16 09:15:02 CEST 2012
Hello,
If you are talking about https://github.com/json-c/json-c/wiki, I
already did it for my jsonrpc plugin (very recent).
Have a look here :
https://github.com/ymettier/collectd/blob/ym/jsonrpc/configure.in
Don't forget to update your src/Makefile.am (see
https://github.com/ymettier/collectd/blob/ym/jsonrpc/src/Makefile.am and
the JSONRPC block)
I have done it for jsonrpc, but it can probably be more generic if you
also need it. Tell me.
For your information, I would like to check the libjson version (0.10
needed because of a bug in 0.9). This is not done yet.
Regards,
Yves
Le 16.10.2012 02:46, Sage Weil a écrit :
> Hi,
>
> We've had this code sitting around for ages and keep porting it when
> debian updates their packages. I finally spent some time to make it
> work
> with the current git master.
>
> The only thing missing here that I know of is some configure.in magic
> to
> check for libjson. I'm not sure what the "right" way to detect a
> library
> that is only need for a single plugin is... any help there would be
> appreciated!
>
> Thanks-
> sage
>
> ----
>
> From 4cc5bfe8e696e9740b691d623c064200ea4530fb Mon Sep 17 00:00:00
> 2001
> From: Sage Weil <sage at inktank.com>
> Date: Mon, 15 Oct 2012 17:44:48 -0700
> Subject: [PATCH] Add ceph plugin
>
> This plugin will read from the socket associated with a Ceph daemon
> and
> gather the performance metrics exposed there. It will first issue a
> 'get schema' command to discover what metrics are available, and will
> then
> slurp them up at regular intervals.
>
> Most of the original code was written by Colin Patrick McCabe
> <cmccabe at alumni.cmu.edu>, and then modified by <sage at inktank.com>.
>
> Signed-off-by: Sage Weil <sage at inktank.com>
> ---
> configure.in | 4 +
> src/Makefile.am | 9 +
> src/ceph.c | 810
> ++++++++++++++++++++++++++++++++++++++++++++++++++
> src/collectd.conf.in | 1 +
> 4 files changed, 824 insertions(+), 0 deletions(-)
> create mode 100644 src/ceph.c
>
> diff --git a/configure.in b/configure.in
> index 2a187b2..1745d37 100644
> --- a/configure.in
> +++ b/configure.in
> @@ -4544,6 +4544,7 @@ dependency_error="no"
> plugin_ascent="no"
> plugin_battery="no"
> plugin_bind="no"
> +plugin_ceph="no"
> plugin_conntrack="no"
> plugin_contextswitch="no"
> plugin_cpu="no"
> @@ -4585,6 +4586,7 @@ plugin_zfs_arc="no"
> if test "x$ac_system" = "xLinux"
> then
> plugin_battery="yes"
> + plugin_ceph="yes"
> plugin_conntrack="yes"
> plugin_contextswitch="yes"
> plugin_cpu="yes"
> @@ -4860,6 +4862,7 @@ AC_PLUGIN([apple_sensors], [$with_libiokit],
> [Apple's hardware sensors])
> AC_PLUGIN([ascent], [$plugin_ascent], [AscentEmu player
> statistics])
> AC_PLUGIN([battery], [$plugin_battery], [Battery statistics])
> AC_PLUGIN([bind], [$plugin_bind], [ISC Bind nameserver
> statistics])
> +AC_PLUGIN([ceph], [$plugin_ceph], [Ceph daemon
> statistics])
> AC_PLUGIN([conntrack], [$plugin_conntrack], [nf_conntrack
> statistics])
> AC_PLUGIN([contextswitch], [$plugin_contextswitch], [context switch
> statistics])
> AC_PLUGIN([cpufreq], [$plugin_cpufreq], [CPU frequency
> statistics])
> @@ -5192,6 +5195,7 @@ Configuration:
> ascent . . . . . . . $enable_ascent
> battery . . . . . . . $enable_battery
> bind . . . . . . . . $enable_bind
> + ceph . . . . . . . . $enable_ceph
> conntrack . . . . . . $enable_conntrack
> contextswitch . . . . $enable_contextswitch
> cpu . . . . . . . . . $enable_cpu
> diff --git a/src/Makefile.am b/src/Makefile.am
> index 5bfe930..82972c1 100644
> --- a/src/Makefile.am
> +++ b/src/Makefile.am
> @@ -201,6 +201,15 @@ collectd_LDADD += "-dlopen" bind.la
> collectd_DEPENDENCIES += bind.la
> endif
>
> +if BUILD_PLUGIN_CEPH
> +pkglib_LTLIBRARIES += ceph.la
> +ceph_la_SOURCES = ceph.c
> +ceph_la_LDFLAGS = -module -avoid-version
> +ceph_la_LIBADD = -ljson
> +collectd_LDADD += "-dlopen" ceph.la
> +collectd_DEPENDENCIES += ceph.la
> +endif
> +
> if BUILD_PLUGIN_CONNTRACK
> pkglib_LTLIBRARIES += conntrack.la
> conntrack_la_SOURCES = conntrack.c
> diff --git a/src/ceph.c b/src/ceph.c
> new file mode 100644
> index 0000000..59d9f12
> --- /dev/null
> +++ b/src/ceph.c
> @@ -0,0 +1,810 @@
> +/**
> + * collectd - src/ceph.c
> + * Copyright (C) 2011 New Dream Network
> + *
> + * This program 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; only version 2 of the License is
> applicable.
> + *
> + * This program 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 this program; if not, write to the Free Software Foundation,
> Inc.,
> + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
> + *
> + * Authors:
> + * Colin McCabe <cmccabe at alumni.cmu.edu>
> + **/
> +
> +#define _BSD_SOURCE
> +
> +#include "collectd.h"
> +#include "common.h"
> +#include "plugin.h"
> +
> +#include <arpa/inet.h>
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <json/json.h>
> +#include <json/json_object_private.h> /* need for struct
> json_object_iter */
> +#include <limits.h>
> +#include <poll.h>
> +#include <stdint.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <strings.h>
> +#include <sys/socket.h>
> +#include <sys/time.h>
> +#include <sys/types.h>
> +#include <sys/un.h>
> +#include <unistd.h>
> +
> +#define RETRY_ON_EINTR(ret, expr) \
> + while(1) { \
> + ret = expr; \
> + if (ret >= 0) \
> + break; \
> + ret = -errno; \
> + if (ret != -EINTR) \
> + break; \
> + }
> +
> +/** Timeout interval in seconds */
> +#define CEPH_TIMEOUT_INTERVAL 1
> +
> +/** Maximum path length for a UNIX domain socket on this system */
> +#define UNIX_DOMAIN_SOCK_PATH_MAX (sizeof(((struct
> sockaddr_un*)0)->sun_path))
> +
> +
> +
> +static void submit_values(const char *plugin_instance,
> + const char *type, const char *type_instance,
> + value_t *values, int num)
> +{
> + value_list_t vl = VALUE_LIST_INIT;
> +
> + DEBUG("submit_values %s/%s/%s num=%d)",
> + plugin_instance, type, type_instance, num);
> + vl.values = values;
> + vl.values_len = num;
> + sstrncpy (vl.host, hostname_g, sizeof (vl.host));
> + sstrncpy (vl.plugin, "ceph", sizeof (vl.plugin));
> + if (plugin_instance != NULL)
> + sstrncpy (vl.plugin_instance, plugin_instance,
> + sizeof (vl.plugin_instance));
> + sstrncpy (vl.type, type, sizeof (vl.type));
> + if (type_instance != NULL)
> + sstrncpy (vl.type_instance, type_instance,
> + sizeof (vl.type_instance));
> +
> + plugin_dispatch_values (&vl);
> +}
> +
> +
> +/******* ceph_daemon *******/
> +struct ceph_daemon
> +{
> + /** Version of the admin_socket interface */
> + uint32_t version;
> +
> + /** Path to the socket that we use to talk to the ceph daemon */
> + char asok_path[UNIX_DOMAIN_SOCK_PATH_MAX];
> +
> + /** instance name **/
> + char name[DATA_MAX_NAME_LEN];
> +
> + /** our types **/
> + int num_types;
> + struct data_set_s *dsets;
> + int *pc_types;
> +};
> +
> +enum perfcounter_type_d {
> + PERFCOUNTER_LONGRUNAVG = 0x4,
> + PERFCOUNTER_COUNTER = 0x8,
> +};
> +
> +/** Array of daemons to monitor */
> +static struct ceph_daemon **g_daemons = NULL;
> +
> +/** Number of elements in g_daemons */
> +static int g_num_daemons = 0;
> +
> +static void ceph_daemon_print(const struct ceph_daemon *d)
> +{
> + DEBUG("name=%s, asok_path=%s", d->name, d->asok_path);
> +}
> +
> +static void ceph_daemons_print(void)
> +{
> + int i;
> + for (i = 0; i < g_num_daemons; ++i) {
> + ceph_daemon_print(g_daemons[i]);
> + }
> +}
> +
> +static void ceph_daemon_free(struct ceph_daemon *d)
> +{
> + int i;
> +
> + for (i = 0; i < d->num_types; i++)
> + plugin_unregister_data_set(d->dsets[i].type);
> + sfree(d->dsets);
> + sfree(d->pc_types);
> + sfree(d);
> +}
> +
> +static int ceph_daemon_add_ds_entry(struct ceph_daemon *d,
> + const char *group, const char *rawkey,
> + int pc_type)
> +{
> + struct data_set_s *dset;
> + int idx;
> + int ret;
> +
> + if (strlen(rawkey) + 6 > DATA_MAX_NAME_LEN)
> + return -ENAMETOOLONG;
> +
> + idx = d->num_types++;
> + d->dsets = realloc(d->dsets, sizeof(*d->dsets) * d->num_types);
> + if (!d->dsets)
> + return -ENOMEM;
> + d->pc_types = realloc(d->pc_types, sizeof(*d->pc_types) *
> d->num_types);
> + if (!d->pc_types)
> + return -ENOMEM;
> +
> + dset = &d->dsets[idx];
> + d->pc_types[idx] = pc_type;
> + snprintf(dset->type, sizeof(dset->type), "ceph_%s", rawkey);
> +
> + if (pc_type & PERFCOUNTER_LONGRUNAVG) {
> + dset->ds_num = 2;
> + dset->ds = malloc(sizeof(*dset->ds) * dset->ds_num);
> + if (!dset->ds)
> + return -ENOMEM;
> + dset->ds[0].type = DS_TYPE_COUNTER;
> + strncpy(dset->ds[0].name, "sum", sizeof(dset->ds[0].name));
> + dset->ds[0].min = NAN;
> + dset->ds[0].max = NAN;
> + dset->ds[1].type = DS_TYPE_COUNTER;
> + strncpy(dset->ds[1].name, "count", sizeof(dset->ds[0].name));
> + dset->ds[1].min = NAN;
> + dset->ds[1].max = NAN;
> + }
> + else {
> + dset->ds_num = 1;
> + dset->ds = malloc(sizeof(*dset->ds) * dset->ds_num);
> + if (!dset->ds)
> + return -ENOMEM;
> + if (pc_type & PERFCOUNTER_COUNTER)
> + dset->ds[0].type = DS_TYPE_COUNTER;
> + else
> + dset->ds[0].type = DS_TYPE_GAUGE;
> + strncpy(dset->ds[0].name, "value", sizeof(dset->ds[0].name));
> + dset->ds[0].min = NAN;
> + dset->ds[0].max = NAN;
> + }
> +
> + ret = plugin_unregister_data_set(dset->type);
> + ret = plugin_register_data_set(dset);
> + DEBUG("plugin_register_data_set %s type %d ds_num %d returned %d",
> + rawkey, pc_type, dset->ds_num, ret);
> + return ret;
> +}
> +
> +/******* ceph_config *******/
> +static int cc_handle_str(struct oconfig_item_s *item, char *dest,
> int dest_len)
> +{
> + const char *val;
> + if (item->values_num != 1) {
> + return -ENOTSUP;
> + }
> + if (item->values[0].type != OCONFIG_TYPE_STRING) {
> + return -ENOTSUP;
> + }
> + val = item->values[0].value.string;
> + if (snprintf(dest, dest_len, "%s", val) > (dest_len - 1)) {
> + ERROR("ceph plugin: configuration parameter '%s' is too long.\n",
> + item->key);
> + return -ENAMETOOLONG;
> + }
> + return 0;
> +}
> +
> +static int ceph_config(oconfig_item_t *ci)
> +{
> + int ret, i;
> + struct ceph_daemon *array, *nd, cd;
> + memset(&cd, 0, sizeof(struct ceph_daemon));
> +
> + for (i = 0; i < ci->children_num; ++i) {
> + oconfig_item_t *child = ci->children + i;
> + if (strcasecmp("Name", child->key) == 0) {
> + ret = cc_handle_str(child, cd.name, DATA_MAX_NAME_LEN);
> + if (ret)
> + return ret;
> + }
> + else if (strcasecmp("SocketPath", child->key) == 0) {
> + ret = cc_handle_str(child, cd.asok_path,
> + sizeof(cd.asok_path));
> + if (ret)
> + return ret;
> + }
> + else {
> + WARNING("ceph plugin: ignoring unknown option %s",
> + child->key);
> + }
> + }
> + if (cd.name[0] == '\0') {
> + ERROR("ceph plugin: you must configure a daemon name.\n");
> + return -EINVAL;
> + }
> + else if (cd.asok_path[0] == '\0') {
> + ERROR("ceph plugin(name=%s): you must configure an administrative
> "
> + "socket path.\n", cd.name);
> + return -EINVAL;
> + }
> + else if (!((cd.asok_path[0] == '/') ||
> + (cd.asok_path[0] == '.' && cd.asok_path[1] == '/'))) {
> + ERROR("ceph plugin(name=%s): administrative socket paths must
> begin with "
> + "'/' or './' Can't parse: '%s'\n",
> + cd.name, cd.asok_path);
> + return -EINVAL;
> + }
> +
> + /* . -> _ in name */
> + for (i = 0; cd.name[i]; ++i)
> + if (cd.name[i] == '.')
> + cd.name[i] = '_';
> +
> + array = realloc(g_daemons,
> + sizeof(struct ceph_daemon *) * (g_num_daemons + 1));
> + if (array == NULL) {
> + /* The positive return value here indicates that this is a
> + * runtime error, not a configuration error. */
> + return ENOMEM;
> + }
> + g_daemons = (struct ceph_daemon**)array;
> + nd = malloc(sizeof(struct ceph_daemon));
> + if (!nd)
> + return ENOMEM;
> + memcpy(nd, &cd, sizeof(struct ceph_daemon));
> + g_daemons[g_num_daemons++] = nd;
> + return 0;
> +}
> +
> +/******* JSON parsing *******/
> +typedef int (*node_handler_t)(void*, const char *, const char*,
> json_object*);
> +
> +static int traverse_json(const char *json,
> + node_handler_t handler, void *handler_arg)
> +{
> + struct json_object_iter ia, ib;
> + json_object *root;
> + int ret;
> +
> + root = json_tokener_parse(json);
> +
> + ret = -EDOM;
> + if (!root)
> + goto out;
> + if (json_object_get_type(root) != json_type_object)
> + goto out;
> +
> + json_object_object_foreachC(root, ia) {
> + json_object_object_foreachC(ia.val, ib) {
> + ret = handler(handler_arg, ia.key, ib.key, ib.val);
> + if (ret < 0)
> + goto out;
> + }
> + }
> + ret = 0;
> +
> +out:
> + json_object_put(root);
> + return ret;
> +}
> +
> +static int node_handler_define_schema(void *arg,
> + const char *group, const char *key,
> + json_object *jo)
> +{
> + struct json_object_iter iter;
> + struct ceph_daemon *d = (struct ceph_daemon *)arg;
> + int pc_type;
> +
> + if (json_object_get_type(jo) != json_type_object)
> + return -EDOM;
> +
> + json_object_object_foreachC(jo, iter) {
> + if (strcmp(iter.key, "type"))
> + return -EDOM;
> + if (json_object_get_type(iter.val) != json_type_int)
> + return -EDOM;
> + pc_type = json_object_get_int(iter.val);
> + DEBUG(" got type d=%s group=%s key=%s pc_type=%04x",
> + d->name, group, key, pc_type);
> + return ceph_daemon_add_ds_entry(d, group, key, pc_type);
> + }
> + return -EDOM;
> +}
> +
> +static int node_handler_fetch_data(void *arg,
> + const char *group, const char *rawkey,
> + json_object *jo)
> +{
> + struct ceph_daemon *d = (struct ceph_daemon *)arg;
> + char key[80];
> + int idx;
> + value_t v[2];
> +
> + snprintf(key, sizeof(key), "ceph_%s", rawkey);
> + DEBUG("fetch_data %s/%s", group, key);
> +
> + for (idx = 0; idx < d->num_types; ++idx)
> + if (strcmp(d->dsets[idx].type, key) == 0)
> + break;
> + if (idx == d->num_types) {
> + DEBUG("couldn't find '%s'", key);
> + return 0;
> + }
> +
> + if (d->pc_types[idx] & PERFCOUNTER_LONGRUNAVG) {
> + json_object *avgcount, *sum;
> + if (json_object_get_type(jo) != json_type_object)
> + return -EINVAL;
> + avgcount = json_object_object_get(jo, "avgcount");
> + sum = json_object_object_get(jo, "sum");
> + if ((!avgcount) || (!sum))
> + return -EINVAL;
> + v[0].counter = json_object_get_int(sum);
> + v[1].counter = json_object_get_int(avgcount);
> + submit_values(group, key, d->name, v, 2);
> + }
> + else if (d->pc_types[idx] & PERFCOUNTER_COUNTER) {
> + /* We use json_object_get_double here because anything > 32
> + * bits may get truncated by json_object_get_int */
> + v[0].counter = json_object_get_double(jo);
> + submit_values(group, key, d->name, v, 1);
> + }
> + else {
> + v[0].gauge = json_object_get_double(jo);
> + submit_values(group, key, d->name, v, 1);
> + }
> + return 0;
> +}
> +
> +
> +
> +/******* network I/O *******/
> +enum cstate_t {
> + CSTATE_UNCONNECTED = 0,
> + CSTATE_WRITE_REQUEST,
> + CSTATE_READ_VERSION,
> + CSTATE_READ_AMT,
> + CSTATE_READ_JSON,
> +};
> +
> +enum request_type_t {
> + ASOK_REQ_VERSION = 0,
> + ASOK_REQ_DATA = 1,
> + ASOK_REQ_SCHEMA = 2,
> + ASOK_REQ_NONE = 1000,
> +};
> +
> +struct cconn
> +{
> + /** The Ceph daemon that we're talking to */
> + struct ceph_daemon *d;
> +
> + /** Request type */
> + uint32_t request_type;
> +
> + /** The connection state */
> + enum cstate_t state;
> +
> + /** The socket we use to talk to this daemon */
> + int asok;
> +
> + /** The amount of data remaining to read / write. */
> + uint32_t amt;
> +
> + /** Length of the JSON to read */
> + uint32_t json_len;
> +
> + /** Buffer containing JSON data */
> + char *json;
> +};
> +
> +static int cconn_connect(struct cconn *io)
> +{
> + struct sockaddr_un address;
> + int flags, fd, err;
> + if (io->state != CSTATE_UNCONNECTED) {
> + ERROR("cconn_connect: io->state != CSTATE_UNCONNECTED");
> + return -EDOM;
> + }
> + fd = socket(PF_UNIX, SOCK_STREAM, 0);
> + if (fd < 0) {
> + int err = -errno;
> + ERROR("cconn_connect: socket(PF_UNIX, SOCK_STREAM, 0) failed: "
> + "error %d", err);
> + return err;
> + }
> + memset(&address, 0, sizeof(struct sockaddr_un));
> + address.sun_family = AF_UNIX;
> + snprintf(address.sun_path, sizeof(address.sun_path),
> + "%s", io->d->asok_path);
> + RETRY_ON_EINTR(err, connect(fd, (struct sockaddr *) &address,
> + sizeof(struct sockaddr_un)));
> + if (err < 0) {
> + ERROR("cconn_connect: connect(%d) failed: error %d", fd, err);
> + return err;
> + }
> +
> + flags = fcntl(fd, F_GETFL, 0);
> + if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) != 0) {
> + err = -errno;
> + ERROR("cconn_connect: fcntl(%d, O_NONBLOCK) error %d", fd, err);
> + return err;
> + }
> + io->asok = fd;
> + io->state = CSTATE_WRITE_REQUEST;
> + io->amt = 0;
> + io->json_len = 0;
> + io->json = NULL;
> + return 0;
> +}
> +
> +static void cconn_close(struct cconn *io)
> +{
> + io->state = CSTATE_UNCONNECTED;
> + if (io->asok != -1) {
> + int res;
> + RETRY_ON_EINTR(res, close(io->asok));
> + }
> + io->asok = -1;
> + io->amt = 0;
> + io->json_len = 0;
> + sfree(io->json);
> + io->json = NULL;
> +}
> +
> +/* Process incoming JSON counter data */
> +static int cconn_process_json(struct cconn *io)
> +{
> + switch (io->request_type) {
> + case ASOK_REQ_DATA:
> + return traverse_json(io->json, node_handler_fetch_data, io->d);
> + case ASOK_REQ_SCHEMA:
> + return traverse_json(io->json, node_handler_define_schema,
> + io->d);
> + default:
> + return -EDOM;
> + }
> +}
> +
> +static int cconn_validate_revents(struct cconn *io, int revents)
> +{
> + if (revents & POLLERR) {
> + ERROR("cconn_validate_revents(name=%s): got POLLERR",
> + io->d->name);
> + return -EIO;
> + }
> + switch (io->state) {
> + case CSTATE_WRITE_REQUEST:
> + return (revents & POLLOUT) ? 0 : -EINVAL;
> + case CSTATE_READ_VERSION:
> + case CSTATE_READ_AMT:
> + case CSTATE_READ_JSON:
> + return (revents & POLLIN) ? 0 : -EINVAL;
> + return (revents & POLLIN) ? 0 : -EINVAL;
> + default:
> + ERROR("cconn_validate_revents(name=%s) got to illegal state on
> line %d",
> + io->d->name, __LINE__);
> + return -EDOM;
> + }
> +}
> +
> +/** Handle a network event for a connection */
> +static int cconn_handle_event(struct cconn *io)
> +{
> + int ret;
> + switch (io->state) {
> + case CSTATE_UNCONNECTED:
> + ERROR("cconn_handle_event(name=%s) got to illegal state on line
> %d",
> + io->d->name, __LINE__);
> + return -EDOM;
> + case CSTATE_WRITE_REQUEST: {
> + uint32_t cmd = htonl(io->request_type);
> + RETRY_ON_EINTR(ret, write(io->asok, ((char*)&cmd) + io->amt,
> + sizeof(cmd) - io->amt));
> + DEBUG("cconn_handle_event(name=%s,state=%d,amt=%d,ret=%d)",
> + io->d->name, io->state, io->amt, ret);
> + if (ret < 0)
> + return ret;
> + io->amt += ret;
> + if (io->amt >= sizeof(cmd)) {
> + io->amt = 0;
> + switch (io->request_type) {
> + case ASOK_REQ_VERSION:
> + io->state = CSTATE_READ_VERSION;
> + break;
> + default:
> + io->state = CSTATE_READ_AMT;
> + break;
> + }
> + }
> + return 0;
> + }
> + case CSTATE_READ_VERSION: {
> + RETRY_ON_EINTR(ret, read(io->asok,
> + ((char*)(&io->d->version)) + io->amt,
> + sizeof(io->d->version) - io->amt));
> + DEBUG("cconn_handle_event(name=%s,state=%d,ret=%d)",
> + io->d->name, io->state, ret);
> + if (ret < 0)
> + return ret;
> + io->amt += ret;
> + if (io->amt >= sizeof(io->d->version)) {
> + io->d->version = ntohl(io->d->version);
> + if (io->d->version != 1) {
> + ERROR("cconn_handle_event(name=%s) not "
> + "expecting version %d!",
> + io->d->name, io->d->version);
> + return -ENOTSUP;
> + }
> + DEBUG("cconn_handle_event(name=%s): identified as "
> + "version %d", io->d->name, io->d->version);
> + io->amt = 0;
> + cconn_close(io);
> + io->request_type = ASOK_REQ_SCHEMA;
> + }
> + return 0;
> + }
> + case CSTATE_READ_AMT: {
> + RETRY_ON_EINTR(ret, read(io->asok,
> + ((char*)(&io->json_len)) + io->amt,
> + sizeof(io->json_len) - io->amt));
> + DEBUG("cconn_handle_event(name=%s,state=%d,ret=%d)",
> + io->d->name, io->state, ret);
> + if (ret < 0)
> + return ret;
> + io->amt += ret;
> + if (io->amt >= sizeof(io->json_len)) {
> + io->json_len = ntohl(io->json_len);
> + io->amt = 0;
> + io->state = CSTATE_READ_JSON;
> + io->json = calloc(1, io->json_len + 1);
> + if (!io->json)
> + return -ENOMEM;
> + }
> + return 0;
> + }
> + case CSTATE_READ_JSON: {
> + RETRY_ON_EINTR(ret, read(io->asok, io->json + io->amt,
> + io->json_len - io->amt));
> + DEBUG("cconn_handle_event(name=%s,state=%d,ret=%d)",
> + io->d->name, io->state, ret);
> + if (ret < 0)
> + return ret;
> + io->amt += ret;
> + if (io->amt >= io->json_len) {
> + DEBUG("raw ceph json is %s", io->json);
> + ret = cconn_process_json(io);
> + if (ret)
> + return ret;
> + cconn_close(io);
> + io->request_type = ASOK_REQ_NONE;
> + }
> + return 0;
> + }
> + default:
> + ERROR("cconn_handle_event(name=%s) got to illegal state on "
> + "line %d", io->d->name, __LINE__);
> + return -EDOM;
> + }
> +}
> +
> +static int cconn_prepare(struct cconn *io, struct pollfd* fds)
> +{
> + int ret;
> + if (io->request_type == ASOK_REQ_NONE) {
> + /* The request has already been serviced. */
> + return 0;
> + }
> + else if ((io->request_type == ASOK_REQ_DATA) &&
> + (io->d->num_types == 0)) {
> + /* If there are no counters to report on, don't bother
> + * connecting */
> + return 0;
> + }
> +
> + switch (io->state) {
> + case CSTATE_UNCONNECTED:
> + ret = cconn_connect(io);
> + if (ret > 0)
> + return -ret;
> + else if (ret < 0)
> + return ret;
> + fds->fd = io->asok;
> + fds->events = POLLOUT;
> + return 1;
> + case CSTATE_WRITE_REQUEST:
> + fds->fd = io->asok;
> + fds->events = POLLOUT;
> + return 1;
> + case CSTATE_READ_VERSION:
> + case CSTATE_READ_AMT:
> + case CSTATE_READ_JSON:
> + fds->fd = io->asok;
> + fds->events = POLLIN;
> + return 1;
> + default:
> + ERROR("cconn_prepare(name=%s) got to illegal state on line %d",
> + io->d->name, __LINE__);
> + return -EDOM;
> + }
> +}
> +
> +/** Returns the difference between two struct timevals in
> milliseconds.
> + * On overflow, we return max/min int.
> + */
> +static int milli_diff(const struct timeval *t1, const struct timeval
> *t2)
> +{
> + int64_t ret;
> + int sec_diff = t1->tv_sec - t2->tv_sec;
> + int usec_diff = t1->tv_usec - t2->tv_usec;
> + ret = usec_diff / 1000;
> + ret += (sec_diff * 1000);
> + if (ret > INT_MAX)
> + return INT_MAX;
> + else if (ret < INT_MIN)
> + return INT_MIN;
> + return (int)ret;
> +}
> +
> +/** This handles the actual network I/O to talk to the Ceph daemons.
> + */
> +static int cconn_main_loop(uint32_t request_type)
> +{
> + int i, ret, some_unreachable = 0;
> + struct timeval end_tv;
> + struct cconn io_array[g_num_daemons];
> +
> + DEBUG("entering cconn_main_loop(request_type = %d)", request_type);
> +
> + /* create cconn array */
> + memset(io_array, 0, sizeof(io_array));
> + for (i = 0; i < g_num_daemons; ++i) {
> + io_array[i].d = g_daemons[i];
> + io_array[i].request_type = request_type;
> + io_array[i].state = CSTATE_UNCONNECTED;
> + }
> +
> + /** Calculate the time at which we should give up */
> + gettimeofday(&end_tv, NULL);
> + end_tv.tv_sec += CEPH_TIMEOUT_INTERVAL;
> +
> + while (1) {
> + int nfds, diff;
> + struct timeval tv;
> + struct cconn *polled_io_array[g_num_daemons];
> + struct pollfd fds[g_num_daemons];
> + memset(fds, 0, sizeof(fds));
> + nfds = 0;
> + for (i = 0; i < g_num_daemons; ++i) {
> + struct cconn *io = io_array + i;
> + ret = cconn_prepare(io, fds + nfds);
> + if (ret < 0) {
> + WARNING("ERROR: cconn_prepare(name=%s,i=%d,st=%d)=%d",
> + io->d->name, i, io->state, ret);
> + cconn_close(io);
> + io->request_type = ASOK_REQ_NONE;
> + some_unreachable = 1;
> + }
> + else if (ret == 1) {
> + DEBUG("did cconn_prepare(name=%s,i=%d,st=%d)",
> + io->d->name, i, io->state);
> + polled_io_array[nfds++] = io_array + i;
> + }
> + }
> + if (nfds == 0) {
> + /* finished */
> + ret = 0;
> + DEBUG("cconn_main_loop: no more cconn to manage.");
> + goto done;
> + }
> + gettimeofday(&tv, NULL);
> + diff = milli_diff(&end_tv, &tv);
> + if (diff <= 0) {
> + /* Timed out */
> + ret = -ETIMEDOUT;
> + WARNING("ERROR: cconn_main_loop: timed out.\n");
> + goto done;
> + }
> + RETRY_ON_EINTR(ret, poll(fds, nfds, diff));
> + if (ret < 0) {
> + ERROR("poll(2) error: %d", ret);
> + goto done;
> + }
> + for (i = 0; i < nfds; ++i) {
> + struct cconn *io = polled_io_array[i];
> + int revents = fds[i].revents;
> + if (revents == 0) {
> + /* do nothing */
> + }
> + else if (cconn_validate_revents(io, revents)) {
> + WARNING("ERROR: cconn(name=%s,i=%d,st=%d): "
> + "revents validation error: "
> + "revents=0x%08x", io->d->name, i,
> + io->state, revents);
> + cconn_close(io);
> + io->request_type = ASOK_REQ_NONE;
> + some_unreachable = 1;
> + }
> + else {
> + int ret = cconn_handle_event(io);
> + if (ret) {
> + WARNING("ERROR: cconn_handle_event(name=%s,"
> + "i=%d,st=%d): error %d",
> + io->d->name, i,
> + io->state, ret);
> + cconn_close(io);
> + io->request_type = ASOK_REQ_NONE;
> + some_unreachable = 1;
> + }
> + }
> + }
> + }
> +done:
> + for (i = 0; i < g_num_daemons; ++i) {
> + cconn_close(io_array + i);
> + }
> + if (some_unreachable) {
> + DEBUG("cconn_main_loop: some Ceph daemons were unreachable.");
> + }
> + else {
> + DEBUG("cconn_main_loop: reached all Ceph daemons :)");
> + }
> + return ret;
> +}
> +
> +static int ceph_read(void)
> +{
> + return cconn_main_loop(ASOK_REQ_DATA);
> +}
> +
> +/******* lifecycle *******/
> +static int ceph_init(void)
> +{
> + DEBUG("ceph_init");
> + ceph_daemons_print();
> +
> + return cconn_main_loop(ASOK_REQ_VERSION);
> +}
> +
> +static int ceph_shutdown(void)
> +{
> + int i;
> + for (i = 0; i < g_num_daemons; ++i) {
> + ceph_daemon_free(g_daemons[i]);
> + }
> + sfree(g_daemons);
> + g_daemons = NULL;
> + g_num_daemons = 0;
> + DEBUG("finished ceph_shutdown");
> + return 0;
> +}
> +
> +void module_register(void)
> +{
> + plugin_register_complex_config("ceph", ceph_config);
> + plugin_register_init("ceph", ceph_init);
> + plugin_register_read("ceph", ceph_read);
> + plugin_register_shutdown("ceph", ceph_shutdown);
> +}
> diff --git a/src/collectd.conf.in b/src/collectd.conf.in
> index 37aceaf..badcaeb 100644
> --- a/src/collectd.conf.in
> +++ b/src/collectd.conf.in
> @@ -59,6 +59,7 @@
> #@BUILD_PLUGIN_ASCENT_TRUE at LoadPlugin ascent
> #@BUILD_PLUGIN_BATTERY_TRUE at LoadPlugin battery
> #@BUILD_PLUGIN_BIND_TRUE at LoadPlugin bind
> +#@BUILD_PLUGIN_CEPH_TRUE at LoadPlugin ceph
> #@BUILD_PLUGIN_CONNTRACK_TRUE at LoadPlugin conntrack
> #@BUILD_PLUGIN_CONTEXTSWITCH_TRUE at LoadPlugin contextswitch
> @BUILD_PLUGIN_CPU_TRUE@@BUILD_PLUGIN_CPU_TRUE at LoadPlugin cpu
--
- Homepage - http://ymettier.free.fr
-
- GPG key - http://ymettier.free.fr/gpg.txt
-
- C en action - http://ymettier.free.fr/livres/C_en_action_ed2.html
-
- Guide Survie C - http://www.pearson.fr/livre/?GCOI=27440100673730
-
More information about the collectd
mailing list