[virt-tools-list] [vhostmd 4/5] Add virtio support to vm-dump-metrics
Jim Fehlig
jfehlig at suse.com
Wed Sep 26 22:41:48 UTC 2018
On 8/30/18 4:11 AM, Michael Trapp wrote:
> virtio functions are available in libmetrics
> and in libserialclient (with minimal dependencies).
>
> ---
>
> We would like to have the serialclient code available in a library without
> additional dependencies, because linking against libmetrics requires libxml2.
Makes sense.
I haven't looked at this or 5/5 closely, but they look ok beyond the whitespace
nits and compilation issues I've mentioned in the other patches.
Can you fix all these issues and post a V2 of this series? I'd like to test your
patches once the compilation errors are fixed :-).
Regards,
Jim
>
> libmetrics/Makefile.am | 19 ++++-
> libmetrics/libmetrics.c | 10 +++
> libmetrics/libmetrics.h | 6 ++
> libmetrics/libserialclient.c | 167 +++++++++++++++++++++++++++++++++++++++++++
> libmetrics/libserialclient.h | 30 ++++++++
> vm-dump-metrics/main.c | 18 +++--
> 6 files changed, 243 insertions(+), 7 deletions(-)
> create mode 100644 libmetrics/libserialclient.c
> create mode 100644 libmetrics/libserialclient.h
>
> diff --git a/libmetrics/Makefile.am b/libmetrics/Makefile.am
> index 28490ee..38d635c 100644
> --- a/libmetrics/Makefile.am
> +++ b/libmetrics/Makefile.am
> @@ -6,7 +6,7 @@ if WITH_XENSTORE
> AM_CFLAGS += -DWITH_XENSTORE
> endif
>
> -lib_LTLIBRARIES=libmetrics.la
> +lib_LTLIBRARIES=libmetrics.la libserialclient.la
>
> libmetricsincdir=$(includedir)/vhostmd
> libmetricsinc_HEADERS = libmetrics.h
> @@ -15,8 +15,21 @@ libmetrics_la_SOURCES = \
> libmetrics.c \
> vm_metrics.c \
> host_metrics.c \
> - libmetrics.h
> + libmetrics.h \
> + libserialclient.c
>
> libmetrics_la_DEPENDENCIES = \
> - libmetrics.h
> + libmetrics.h \
> + libserialclient.h
> +
> +
> +libserialclientincdir=
> +libserialclientinc_HEADERS = libserialclient.h
> +
> +libserialclient_la_SOURCES = \
> + libserialclient.c \
> + libserialclient.h
> +
> +libserialclient_la_DEPENDENCIES = \
> + libserialclient.h
>
> diff --git a/libmetrics/libmetrics.c b/libmetrics/libmetrics.c
> index 81f4d1a..12cfed5 100644
> --- a/libmetrics/libmetrics.c
> +++ b/libmetrics/libmetrics.c
> @@ -63,6 +63,16 @@ typedef struct _private_metric
> metric_type type;
> }private_metric;
>
> +typedef struct _virtio_buffer {
> + char uuid[256];
> + char *virtio_name;
> + char *buffer;
> + uint32_t sum;
> + uint32_t length;
> + xmlParserCtxtPtr pctxt;
> + xmlDocPtr doc;
> +} virtio_buffer;
> +
> #define MDISK_SIGNATURE 0x6d766264 /* 'mvbd' */
> #define SYS_BLOCK "/sys/block"
> #define HOST_CONTEXT "host"
> diff --git a/libmetrics/libmetrics.h b/libmetrics/libmetrics.h
> index 717bc73..1908de8 100644
> --- a/libmetrics/libmetrics.h
> +++ b/libmetrics/libmetrics.h
> @@ -100,4 +100,10 @@ int dump_metrics(const char *dest_file);
> /* dump metrics from xenstore to xml formatted file */
> int dump_xenstore_metrics(const char *dest_file);
>
> +/* dump metrics from virtio serial port to xml formatted file */
> +int dump_virtio_metrics(const char *dest_file);
> +
> +/* dump metrics from virtio serial port to buffer */
> +const char *get_virtio_metrics(const char *dev_name);
> +
> #endif
> diff --git a/libmetrics/libserialclient.c b/libmetrics/libserialclient.c
> new file mode 100644
> index 0000000..9a197f2
> --- /dev/null
> +++ b/libmetrics/libserialclient.c
> @@ -0,0 +1,167 @@
> +/*
> + * Copyright (C) 2018 SAP SE
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * This library 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
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + *
> + * Author: Michael Trapp <michael.trapp at sap.com>
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <time.h>
> +#include <string.h>
> +#include <fcntl.h>
> +#include <unistd.h>
> +#include <errno.h>
> +
> +#include "libserialclient.h"
> +
> +
> +/*
> + * dump metrics from virtio serial port to xml formatted file
> + */
> +int dump_virtio_metrics(const char *dest_file)
> +{
> + FILE *fp = stdout;
> + char *response;
> + int len;
> +
> + response = (char*) get_virtio_metrics(NULL);
> + if (response == NULL)
> + goto error;
> +
> + len = strlen(response);
> +
> + if (dest_file) {
> + fp = fopen(dest_file, "w");
> + if (fp == NULL) {
> + fprintf(stderr,"LIB_SERIALCLIENT: Error, unable to dump metrics: fopen(%s) %s\n",
> + dest_file, strerror(errno));
> + goto error;
> + }
> + }
> +
> + if (fwrite(response, 1, len, fp) != len) {
> + fprintf(stderr,"LIB_SERIALCLIENT: Error, unable to export metrics to file:%s - error:%s\n",
> + dest_file ? dest_file : "STDOUT", strerror(errno));
> + goto error;
> + }
> +
> + if (response)
> + free(response);
> +
> + return 0;
> +
> + error:
> + if (dest_file && fp)
> + fclose(fp);
> +
> + if (response)
> + free(response);
> +
> + return -1;
> +}
> +
> +/*
> + * dump metrics from virtio serial port to buffer
> + */
> +const char *get_virtio_metrics(const char *dev_name)
> +{
> + const char request[] = "GET /metrics/XML\n\n",
> + end_token[] = "\n\n",
> + *dev;
> + char *response = NULL;
> + int fd = -1, pos, buf_size = (1 << 16);
> + const int req_len = strlen(request);
> + const time_t start_time = time(NULL);
> +
> + if (dev_name)
> + dev = dev_name;
> + else
> + dev = "/dev/virtio-ports/vhostmd";
> +
> + response = calloc(1, buf_size);
> + if (response == NULL)
> + goto error;
> +
> + fd = open(dev, O_RDWR | O_NONBLOCK);
> +
> + if (fd < 0) {
> + fprintf(stderr,"LIB_SERIALCLIENT: Error, unable to dump metrics: open(%s) %s\n",
> + dev, strerror(errno));
> + goto error;
> + }
> +
> + pos = 0;
> + while (pos < req_len) {
> + int len = write(fd, &request[pos], req_len - pos);
> + if (len > 0)
> + pos += len;
> + else {
> + if (errno == EAGAIN)
> + usleep(10000);
> + else
> + goto error;
> + }
> + }
> +
> + pos = 0;
> + do {
> + int len = read(fd, &response[pos], buf_size - pos - 1);
> + if (len > 0) {
> + pos += len;
> + response[pos] = 0;
> +
> + if ((pos + 1) >= buf_size) {
> + buf_size = buf_size << 1; // increase response buffer
> + if (buf_size > (1 << 24)) // max 16MB
> + goto error;
> +
> + response = realloc(response, buf_size);
> + if (response == NULL)
> + goto error;
> +
> + memset(&response[pos], 0, buf_size - pos);
> + }
> + }
> + else {
> + if (errno == EAGAIN) {
> + usleep(10000);
> + if (time(NULL) > (start_time + 30)) {
> + fprintf(stderr,"LIB_SERIALCLIENT: Error, unable to read metrics"
> + " - timeout after 30s\n");
> + goto error;
> + }
> + }
> + else
> + goto error;
> + }
> + } while ((pos < strlen(end_token) ||
> + strcmp(end_token, &response[pos - strlen(end_token)]) != 0) &&
> + pos < buf_size);
> +
> + if (fd >= 0)
> + close(fd);
> +
> + return response;
> +
> + error:
> + if (fd >= 0)
> + close(fd);
> + if (response)
> + free(response);
> +
> + return NULL;
> +}
> diff --git a/libmetrics/libserialclient.h b/libmetrics/libserialclient.h
> new file mode 100644
> index 0000000..d0327ea
> --- /dev/null
> +++ b/libmetrics/libserialclient.h
> @@ -0,0 +1,30 @@
> +/*
> + * Copyright (C) 2018 SAP SE
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * This library 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
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + *
> + * Author: Michael Trapp <michael.trapp at sap.com>
> + */
> +
> +#ifndef __LIBSERIALCLIENT_H__
> +#define __LIBSERIALCLIENT_H__
> +
> +/* dump metrics from virtio serial port to xml formatted file */
> +int dump_virtio_metrics(const char *dest_file);
> +
> +/* dump metrics from virtio serial port to buffer */
> +const char *get_virtio_metrics(const char *dev_name);
> +
> +#endif
> diff --git a/vm-dump-metrics/main.c b/vm-dump-metrics/main.c
> index f48a615..af35703 100644
> --- a/vm-dump-metrics/main.c
> +++ b/vm-dump-metrics/main.c
> @@ -33,6 +33,7 @@ static void usage(const char *argv0)
> -v | --verbose Verbose messages.\n\
> -d | --dest Metrics destination file .\n\
> -b | --vbd Get metrics from vbd.\n\
> + -i | --virtio Get metrics from virtio channel.\n\
> -x | --xenstore Get metrics from xenstore.\n";
> #else
> char *options_str = "Options:\n\
> @@ -54,6 +55,7 @@ int main(int argc, char *argv[])
> int verbose = 0;
> #ifdef WITH_XENSTORE
> int vbd = 0;
> + int virtio = 0;
> int xenstore = 0;
> #endif
> const char *dfile = NULL;
> @@ -62,6 +64,7 @@ int main(int argc, char *argv[])
> { "verbose", no_argument, &verbose, 1},
> #ifdef WITH_XENSTORE
> { "vbd", no_argument, &vbd, 1},
> + { "virtio", no_argument, &virtio, 1},
> { "xenstore", no_argument, &xenstore, 1},
> #endif
> { "help", no_argument, NULL, '?' },
> @@ -74,9 +77,9 @@ int main(int argc, char *argv[])
> int c;
>
> #ifdef WITH_XENSTORE
> - c = getopt_long(argc, argv, "d:vbx", opts, &optidx);
> + c = getopt_long(argc, argv, "d:vibx", opts, &optidx);
> #else
> - c = getopt_long(argc, argv, "d:v", opts, &optidx);
> + c = getopt_long(argc, argv, "d:vi", opts, &optidx);
> #endif
>
> if (c == -1)
> @@ -97,6 +100,9 @@ int main(int argc, char *argv[])
> xenstore = 1;
> break;
> #endif
> + case 'i':
> + virtio = 1;
> + break;
> case 'd':
> dfile = optarg;
> break;
> @@ -109,6 +115,10 @@ int main(int argc, char *argv[])
> }
> }
>
> + if (virtio) {
> + if (dump_virtio_metrics(dfile) == -1)
> + exit (1);
> + }
> #ifdef WITH_XENSTORE
> if (xenstore) {
> if (dump_xenstore_metrics(dfile) == -1)
> @@ -119,10 +129,10 @@ int main(int argc, char *argv[])
> exit (1);
> }
> /* Try disk first and if not found try xenstore */
> - if (vbd == 0 && xenstore == 0) {
> + if (virtio == 0 && vbd == 0 && xenstore == 0) {
> if (dump_metrics(dfile) == -1)
> if (dump_xenstore_metrics(dfile) == -1)
> - exit (1);
> + exit (1);
> }
> #else
> if (dump_metrics(dfile) == -1)
>
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