From: Ciara Power <ciara.power@intel.com>
To: dev@dpdk.org, kevin.laatz@intel.com
Cc: reshma.pattan@intel.com, jerinjacobk@gmail.com,
david.marchand@redhat.com, keith.wiles@intel.com,
mb@smartsharesystems.com, thomas@monjalon.net,
Bruce Richardson <bruce.richardson@intel.com>
Subject: [dpdk-dev] [PATCH v3 06/17] telemetry: add utility functions for creating json
Date: Tue, 21 Apr 2020 13:39:38 +0100 [thread overview]
Message-ID: <20200421123949.38270-7-ciara.power@intel.com> (raw)
In-Reply-To: <20200421123949.38270-1-ciara.power@intel.com>
From: Bruce Richardson <bruce.richardson@intel.com>
The functions added in this patch will make it easier for applications
to build up correct JSON responses to telemetry requests.
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
lib/librte_telemetry/Makefile | 1 +
lib/librte_telemetry/meson.build | 2 +-
lib/librte_telemetry/rte_telemetry.h | 1 +
lib/librte_telemetry/rte_telemetry_json.h | 206 ++++++++++++++++++++++
4 files changed, 209 insertions(+), 1 deletion(-)
create mode 100644 lib/librte_telemetry/rte_telemetry_json.h
diff --git a/lib/librte_telemetry/Makefile b/lib/librte_telemetry/Makefile
index 270e1aac54..dbf16f4bec 100644
--- a/lib/librte_telemetry/Makefile
+++ b/lib/librte_telemetry/Makefile
@@ -27,5 +27,6 @@ SRCS-$(CONFIG_RTE_LIBRTE_TELEMETRY) += telemetry.c
# export include files
SYMLINK-$(CONFIG_RTE_LIBRTE_TELEMETRY)-include := rte_telemetry.h
+SYMLINK-$(CONFIG_RTE_LIBRTE_TELEMETRY)-include += rte_telemetry_json.h
include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_telemetry/meson.build b/lib/librte_telemetry/meson.build
index 0cdae414a4..c8e2fdd0b2 100644
--- a/lib/librte_telemetry/meson.build
+++ b/lib/librte_telemetry/meson.build
@@ -5,7 +5,7 @@ includes = [global_inc]
sources = files('rte_telemetry.c', 'rte_telemetry_parser.c', 'rte_telemetry_parser_test.c',
'telemetry.c')
-headers = files('rte_telemetry.h', 'rte_telemetry_internal.h', 'rte_telemetry_parser.h')
+headers = files('rte_telemetry.h', 'rte_telemetry_internal.h', 'rte_telemetry_parser.h', 'rte_telemetry_json.h')
includes += include_directories('../librte_metrics')
jansson = dependency('jansson', required: false)
diff --git a/lib/librte_telemetry/rte_telemetry.h b/lib/librte_telemetry/rte_telemetry.h
index 27067b1250..dc63b54423 100644
--- a/lib/librte_telemetry/rte_telemetry.h
+++ b/lib/librte_telemetry/rte_telemetry.h
@@ -4,6 +4,7 @@
#include <stdint.h>
#include <rte_compat.h>
+#include <rte_telemetry_json.h>
#ifndef _RTE_TELEMETRY_H_
#define _RTE_TELEMETRY_H_
diff --git a/lib/librte_telemetry/rte_telemetry_json.h b/lib/librte_telemetry/rte_telemetry_json.h
new file mode 100644
index 0000000000..bb926b918b
--- /dev/null
+++ b/lib/librte_telemetry/rte_telemetry_json.h
@@ -0,0 +1,206 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2020 Intel Corporation
+ */
+
+#ifndef _RTE_TELEMETRY_JSON_H_
+#define _RTE_TELEMETRY_JSON_H_
+
+#include <inttypes.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <rte_common.h>
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: all functions in this file may change without prior notice
+ *
+ * @file
+ * RTE Telemetry Utility Functions for Creating JSON Responses
+ *
+ * This file contains small inline functions to make it easier for applications
+ * to build up valid JSON responses to telemetry requests.
+ *
+ ***/
+
+/**
+ * @internal
+ *
+ * Copies a value into a buffer if the buffer has enough available space.
+ * Nothing written to buffer if an overflow ocurs.
+ * This function is not for use for values larger than 1k.
+ *
+ * @param buf
+ * Buffer for data to be appended to.
+ * @param len
+ * Length of buffer.
+ * @param format
+ * Format string.
+ * @param ...
+ * Optional arguments that may be required by the format string.
+ *
+ * @return
+ * Number of characters added to buffer
+ */
+__rte_format_printf(3, 4)
+static inline int
+__json_snprintf(char *buf, const int len, const char *format, ...)
+{
+ char tmp[1024];
+ va_list ap;
+ int ret;
+
+ va_start(ap, format);
+ ret = vsnprintf(tmp, sizeof(tmp), format, ap);
+ va_end(ap);
+ if (ret > 0 && ret < (int)sizeof(tmp) && ret < len) {
+ strcpy(buf, tmp);
+ return ret;
+ }
+ return 0; /* nothing written or modified */
+}
+
+/**
+ * Copies an empty array into the provided buffer.
+ *
+ * @param buf
+ * Buffer to hold the empty array.
+ * @param len
+ * Length of buffer.
+ * @param used
+ * The number of used characters in the buffer.
+ *
+ * @return
+ * Total number of characters in buffer.
+ */
+static inline int
+rte_tel_json_empty_array(char *buf, const int len, const int used)
+{
+ return used + __json_snprintf(buf + used, len - used, "[]");
+}
+
+/**
+ * Copies an empty object into the provided buffer.
+ *
+ * @param buf
+ * Buffer to hold the empty object.
+ * @param len
+ * Length of buffer.
+ * @param used
+ * The number of used characters in the buffer.
+ *
+ * @return
+ * Total number of characters in buffer
+ */
+static inline int
+rte_tel_json_empty_obj(char *buf, const int len, const int used)
+{
+ return used + __json_snprintf(buf + used, len - used, "{}");
+}
+
+/**
+ * Copies a string into the provided buffer, in JSON format.
+ *
+ * @param buf
+ * Buffer to copy string into.
+ * @param len
+ * Length of buffer.
+ * @param used
+ * The number of used characters in the buffer.
+ * @param str
+ * String value to copy into buffer.
+ *
+ * @return
+ * Total number of characters in buffer
+ */
+static inline int
+rte_tel_json_str(char *buf, const int len, const int used, const char *str)
+{
+ return used + __json_snprintf(buf + used, len - used, "\"%s\"", str);
+}
+
+/**
+ * Appends a string into the JSON array in the provided buffer.
+ *
+ * @param buf
+ * Buffer to append array string to.
+ * @param len
+ * Length of buffer.
+ * @param used
+ * The number of used characters in the buffer.
+ * @param str
+ * String value to append to buffer.
+ *
+ * @return
+ * Total number of characters in buffer
+ */
+static inline int
+rte_tel_json_add_array_string(char *buf, const int len, const int used,
+ const char *str)
+{
+ int ret, end = used - 1; /* strip off final delimiter */
+ if (used <= 2) /* assume empty, since minimum is '[]' */
+ return __json_snprintf(buf, len, "[\"%s\"]", str);
+
+ ret = __json_snprintf(buf + end, len - end, ",\"%s\"]", str);
+ return ret == 0 ? used : end + ret;
+}
+
+/**
+ * Appends an integer into the JSON array in the provided buffer.
+ *
+ * @param buf
+ * Buffer to append array integer to.
+ * @param len
+ * Length of buffer.
+ * @param used
+ * The number of used characters in the buffer.
+ * @param val
+ * Integer value to append to buffer.
+ *
+ * @return
+ * Total number of characters in buffer
+ */
+static inline int
+rte_tel_json_add_array_int(char *buf, const int len, const int used, int val)
+{
+ int ret, end = used - 1; /* strip off final delimiter */
+ if (used <= 2) /* assume empty, since minimum is '[]' */
+ return __json_snprintf(buf, len, "[%d]", val);
+
+ ret = __json_snprintf(buf + end, len - end, ",%d]", val);
+ return ret == 0 ? used : end + ret;
+}
+
+/**
+ * Add a new element with uint64_t value to the JSON object stored in the
+ * provided buffer.
+ *
+ * @param buf
+ * Buffer to append object element to.
+ * @param len
+ * Length of buffer.
+ * @param used
+ * The number of used characters in the buffer.
+ * @param name
+ * String for object element key.
+ * @param val
+ * Uint64_t for object element value.
+ *
+ * @return
+ * Total number of characters in buffer
+ */
+static inline int
+rte_tel_json_add_obj_u64(char *buf, const int len, const int used,
+ const char *name, uint64_t val)
+{
+ int ret, end = used - 1;
+ if (used <= 2) /* assume empty, since minimum is '{}' */
+ return __json_snprintf(buf, len, "{\"%s\":%"PRIu64"}", name,
+ val);
+
+ ret = __json_snprintf(buf + end, len - end, ",\"%s\":%"PRIu64"}",
+ name, val);
+ return ret == 0 ? used : end + ret;
+}
+
+#endif /*_RTE_TELEMETRY_JSON_H_*/
--
2.17.1
next prev parent reply other threads:[~2020-04-21 13:00 UTC|newest]
Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-19 17:18 [dpdk-dev] [PATCH 00/12] update and simplify telemetry library Ciara Power
2020-03-19 17:18 ` [dpdk-dev] [PATCH 01/12] telemetry: move code to metrics for later reuse Ciara Power
2020-03-19 17:18 ` [dpdk-dev] [PATCH 02/12] metrics: reduce code taken from telemetry Ciara Power
2020-03-19 17:18 ` [dpdk-dev] [PATCH 03/12] telemetry: invert dependency on metrics Ciara Power
2020-03-19 17:18 ` [dpdk-dev] [PATCH 04/12] telemetry: introduce new telemetry functionality Ciara Power
2020-03-19 17:19 ` [dpdk-dev] [PATCH 05/12] ethdev: add callback support for telemetry Ciara Power
2020-03-19 17:19 ` [dpdk-dev] [PATCH 06/12] usertools: add new telemetry python script Ciara Power
2020-03-19 17:19 ` [dpdk-dev] [PATCH 07/12] rawdev: add callback support for telemetry Ciara Power
2020-03-19 17:19 ` [dpdk-dev] [PATCH 08/12] examples/l3fwd-power: enable use of new telemetry Ciara Power
2020-03-19 17:19 ` [dpdk-dev] [PATCH 09/12] telemetry: introduce telemetry backward compatibility Ciara Power
2020-03-19 17:19 ` [dpdk-dev] [PATCH 10/12] telemetry: remove existing telemetry files Ciara Power
2020-03-19 17:19 ` [dpdk-dev] [PATCH 11/12] lib: add telemetry as eal dependency Ciara Power
2020-03-20 12:03 ` Jerin Jacob
2020-03-20 13:50 ` Bruce Richardson
2020-03-19 17:19 ` [dpdk-dev] [PATCH 12/12] eal: add eal telemetry callbacks Ciara Power
2020-04-01 15:42 ` [dpdk-dev] [PATCH 00/12] update and simplify telemetry library David Marchand
2020-04-01 16:16 ` Bruce Richardson
2020-04-02 8:30 ` Morten Brørup
2020-04-02 9:38 ` Thomas Monjalon
2020-04-01 16:48 ` Wiles, Keith
2020-04-02 10:09 ` Bruce Richardson
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 00/16] " Ciara Power
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 01/16] build: add arch-specific header path to global includes Ciara Power
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 02/16] telemetry: move code to metrics for later reuse Ciara Power
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 03/16] metrics: reduce code taken from telemetry Ciara Power
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 04/16] telemetry: invert dependency on metrics Ciara Power
2020-04-10 16:15 ` Pattan, Reshma
2020-04-15 9:50 ` Power, Ciara
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 05/16] telemetry: introduce new telemetry functionality Ciara Power
2020-04-08 17:56 ` Wiles, Keith
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 06/16] telemetry: add utility functions for creating json Ciara Power
2020-04-08 18:12 ` Wiles, Keith
2020-04-09 8:19 ` Bruce Richardson
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 07/16] app/test: add telemetry json tests Ciara Power
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 08/16] ethdev: add callback support for telemetry Ciara Power
2020-04-08 18:16 ` Wiles, Keith
2020-04-09 8:20 ` Bruce Richardson
2020-04-10 9:57 ` [dpdk-dev] [PATCH v2 08/16] ethdev: add callback support fortelemetry Morten Brørup
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 09/16] usertools: add new telemetry python script Ciara Power
2020-04-10 9:43 ` Pattan, Reshma
2020-04-10 9:54 ` Bruce Richardson
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 10/16] rawdev: add callback support for telemetry Ciara Power
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 11/16] examples/l3fwd-power: enable use of new telemetry Ciara Power
2020-04-10 8:42 ` Pattan, Reshma
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 12/16] telemetry: introduce telemetry backward compatibility Ciara Power
2020-04-10 17:00 ` Pattan, Reshma
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 13/16] telemetry: remove existing telemetry files Ciara Power
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 14/16] lib: add telemetry as eal dependency Ciara Power
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 15/16] eal: add eal telemetry callbacks Ciara Power
2020-04-08 16:49 ` [dpdk-dev] [PATCH v2 16/16] doc: update telemetry documentation Ciara Power
2020-04-08 18:03 ` [dpdk-dev] [PATCH v2 00/16] update and simplify telemetry library Thomas Monjalon
2020-04-09 9:19 ` Bruce Richardson
2020-04-09 9:37 ` Thomas Monjalon
2020-04-10 14:39 ` Wiles, Keith
2020-04-10 14:51 ` Thomas Monjalon
2020-04-10 14:59 ` Wiles, Keith
2020-04-23 10:30 ` Luca Boccassi
2020-04-23 10:44 ` Thomas Monjalon
2020-04-23 11:46 ` Luca Boccassi
2020-04-10 10:49 ` Morten Brørup
2020-04-10 14:21 ` Wiles, Keith
2020-04-10 18:06 ` [dpdk-dev] [PATCH v2 00/16] update and simplify telemetrylibrary Morten Brørup
2020-04-20 13:18 ` Bruce Richardson
2020-04-20 14:55 ` [dpdk-dev] [PATCH v2 00/16] update and simplifytelemetrylibrary Morten Brørup
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 00/17] update and simplify telemetry library Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 01/17] build: add arch-specific header path to global includes Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 02/17] telemetry: move code to metrics for later reuse Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 03/17] metrics: reduce code taken from telemetry Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 04/17] telemetry: invert dependency on metrics Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 05/17] telemetry: introduce new telemetry functionality Ciara Power
2020-04-21 12:39 ` Ciara Power [this message]
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 07/17] app/test: add telemetry json tests Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 08/17] ethdev: add callback support for telemetry Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 09/17] usertools: add new telemetry python script Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 10/17] rawdev: add callback support for telemetry Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 11/17] examples/l3fwd-power: enable use of new telemetry Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 12/17] telemetry: introduce telemetry backward compatibility Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 13/17] telemetry: remove existing telemetry files Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 14/17] lib: add telemetry as eal dependency Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 15/17] eal: remove rte-option infrastructure Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 16/17] eal: add eal telemetry callbacks Ciara Power
2020-04-21 12:39 ` [dpdk-dev] [PATCH v3 17/17] doc: update telemetry documentation Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 00/18] update and simplify telemetry library Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 01/18] build: add arch-specific header path to global includes Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 02/18] telemetry: move code to metrics for later reuse Ciara Power
2020-04-24 15:29 ` Stephen Hemminger
2020-04-24 15:49 ` Bruce Richardson
2020-04-27 9:53 ` Power, Ciara
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 03/18] metrics: reduce code taken from telemetry Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 04/18] telemetry: invert dependency on metrics Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 05/18] telemetry: add utility functions for creating json Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 06/18] telemetry: introduce new telemetry functionality Ciara Power
2020-04-24 20:50 ` Wiles, Keith
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 07/18] telemetry: add functions for returning callback data Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 08/18] telemetry: add default callback commands Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 09/18] usertools: add new telemetry python script Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 10/18] ethdev: add callback support for telemetry Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 11/18] rawdev: " Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 12/18] examples/l3fwd-power: enable use of new telemetry Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 13/18] telemetry: introduce telemetry backward compatibility Ciara Power
2020-04-24 20:59 ` Wiles, Keith
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 14/18] telemetry: remove existing telemetry files Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 15/18] lib: add telemetry as eal dependency Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 16/18] eal: remove rte-option infrastructure Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 17/18] eal: add eal telemetry callbacks Ciara Power
2020-04-24 12:41 ` [dpdk-dev] [PATCH v4 18/18] doc: update telemetry documentation Ciara Power
2020-04-24 21:09 ` [dpdk-dev] [PATCH v4 00/18] update and simplify telemetry library Wiles, Keith
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 " Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 01/18] build: add arch-specific header path to global includes Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 02/18] telemetry: move code to metrics for later reuse Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 03/18] metrics: reduce code taken from telemetry Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 04/18] telemetry: invert dependency on metrics Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 05/18] telemetry: add utility functions for creating json Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 06/18] telemetry: introduce new telemetry functionality Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 07/18] telemetry: add functions for returning callback data Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 08/18] telemetry: add default callback commands Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 09/18] usertools: add new telemetry python script Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 10/18] ethdev: add callback support for telemetry Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 11/18] rawdev: " Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 12/18] examples/l3fwd-power: enable use of new telemetry Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 13/18] telemetry: introduce telemetry backward compatibility Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 14/18] telemetry: remove existing telemetry files Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 15/18] lib: add telemetry as eal dependency Ciara Power
2020-05-10 22:29 ` Thomas Monjalon
2020-05-11 8:41 ` Bruce Richardson
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 16/18] eal: remove rte-option infrastructure Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 17/18] eal: add eal telemetry callbacks Ciara Power
2020-04-30 16:01 ` [dpdk-dev] [PATCH v5 18/18] doc: update telemetry documentation Ciara Power
2020-05-01 14:41 ` [dpdk-dev] [PATCH v5 00/18] update and simplify telemetry library Wiles, Keith
2020-05-10 22:41 ` Thomas Monjalon
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