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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 13:40:54 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 13:40:54 +0000
commit317c0644ccf108aa23ef3fd8358bd66c2840bfc0 (patch)
treec417b3d25c86b775989cb5ac042f37611b626c8a /src/sparkline.c
parentInitial commit. (diff)
downloadredis-317c0644ccf108aa23ef3fd8358bd66c2840bfc0.tar.xz
redis-317c0644ccf108aa23ef3fd8358bd66c2840bfc0.zip
Adding upstream version 5:7.2.4.upstream/5%7.2.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/sparkline.c')
-rw-r--r--src/sparkline.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/src/sparkline.c b/src/sparkline.c
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+/* sparkline.c -- ASCII Sparklines
+ * This code is modified from http://github.com/antirez/aspark and adapted
+ * in order to return SDS strings instead of outputting directly to
+ * the terminal.
+ *
+ * ---------------------------------------------------------------------------
+ *
+ * Copyright(C) 2011-2014 Salvatore Sanfilippo <antirez@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * 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 COPYRIGHT HOLDERS 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 THE COPYRIGHT OWNER 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 "server.h"
+
+#include <math.h>
+
+/* This is the charset used to display the graphs, but multiple rows are used
+ * to increase the resolution. */
+static char charset[] = "_-`";
+static char charset_fill[] = "_o#";
+static int charset_len = sizeof(charset)-1;
+static int label_margin_top = 1;
+
+/* ----------------------------------------------------------------------------
+ * Sequences are arrays of samples we use to represent data to turn
+ * into sparklines. This is the API in order to generate a sparkline:
+ *
+ * struct sequence *seq = createSparklineSequence();
+ * sparklineSequenceAddSample(seq, 10, NULL);
+ * sparklineSequenceAddSample(seq, 20, NULL);
+ * sparklineSequenceAddSample(seq, 30, "last sample label");
+ * sds output = sparklineRender(sdsempty(), seq, 80, 4, SPARKLINE_FILL);
+ * freeSparklineSequence(seq);
+ * ------------------------------------------------------------------------- */
+
+/* Create a new sequence. */
+struct sequence *createSparklineSequence(void) {
+ struct sequence *seq = zmalloc(sizeof(*seq));
+ seq->length = 0;
+ seq->labels = 0;
+ seq->samples = NULL;
+ seq->min = 0.0f;
+ seq->max = 0.0f;
+ return seq;
+}
+
+/* Add a new sample into a sequence. */
+void sparklineSequenceAddSample(struct sequence *seq, double value, char *label) {
+ label = (label == NULL || label[0] == '\0') ? NULL : zstrdup(label);
+ if (seq->length == 0) {
+ seq->min = seq->max = value;
+ } else {
+ if (value < seq->min) seq->min = value;
+ else if (value > seq->max) seq->max = value;
+ }
+ seq->samples = zrealloc(seq->samples,sizeof(struct sample)*(seq->length+1));
+ seq->samples[seq->length].value = value;
+ seq->samples[seq->length].label = label;
+ seq->length++;
+ if (label) seq->labels++;
+}
+
+/* Free a sequence. */
+void freeSparklineSequence(struct sequence *seq) {
+ int j;
+
+ for (j = 0; j < seq->length; j++)
+ zfree(seq->samples[j].label);
+ zfree(seq->samples);
+ zfree(seq);
+}
+
+/* ----------------------------------------------------------------------------
+ * ASCII rendering of sequence
+ * ------------------------------------------------------------------------- */
+
+/* Render part of a sequence, so that render_sequence() call call this function
+ * with different parts in order to create the full output without overflowing
+ * the current terminal columns. */
+sds sparklineRenderRange(sds output, struct sequence *seq, int rows, int offset, int len, int flags) {
+ int j;
+ double relmax = seq->max - seq->min;
+ int steps = charset_len*rows;
+ int row = 0;
+ char *chars = zmalloc(len);
+ int loop = 1;
+ int opt_fill = flags & SPARKLINE_FILL;
+ int opt_log = flags & SPARKLINE_LOG_SCALE;
+
+ if (opt_log) {
+ relmax = log(relmax+1);
+ } else if (relmax == 0) {
+ relmax = 1;
+ }
+
+ while(loop) {
+ loop = 0;
+ memset(chars,' ',len);
+ for (j = 0; j < len; j++) {
+ struct sample *s = &seq->samples[j+offset];
+ double relval = s->value - seq->min;
+ int step;
+
+ if (opt_log) relval = log(relval+1);
+ step = (int) (relval*steps)/relmax;
+ if (step < 0) step = 0;
+ if (step >= steps) step = steps-1;
+
+ if (row < rows) {
+ /* Print the character needed to create the sparkline */
+ int charidx = step-((rows-row-1)*charset_len);
+ loop = 1;
+ if (charidx >= 0 && charidx < charset_len) {
+ chars[j] = opt_fill ? charset_fill[charidx] :
+ charset[charidx];
+ } else if(opt_fill && charidx >= charset_len) {
+ chars[j] = '|';
+ }
+ } else {
+ /* Labels spacing */
+ if (seq->labels && row-rows < label_margin_top) {
+ loop = 1;
+ break;
+ }
+ /* Print the label if needed. */
+ if (s->label) {
+ int label_len = strlen(s->label);
+ int label_char = row - rows - label_margin_top;
+
+ if (label_len > label_char) {
+ loop = 1;
+ chars[j] = s->label[label_char];
+ }
+ }
+ }
+ }
+ if (loop) {
+ row++;
+ output = sdscatlen(output,chars,len);
+ output = sdscatlen(output,"\n",1);
+ }
+ }
+ zfree(chars);
+ return output;
+}
+
+/* Turn a sequence into its ASCII representation */
+sds sparklineRender(sds output, struct sequence *seq, int columns, int rows, int flags) {
+ int j;
+
+ for (j = 0; j < seq->length; j += columns) {
+ int sublen = (seq->length-j) < columns ? (seq->length-j) : columns;
+
+ if (j != 0) output = sdscatlen(output,"\n",1);
+ output = sparklineRenderRange(output, seq, rows, j, sublen, flags);
+ }
+ return output;
+}
+