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authorJeff Hostetler <jeffhost@microsoft.com>2019-02-22 22:25:01 (GMT)
committerJunio C Hamano <gitster@pobox.com>2019-02-22 23:27:59 (GMT)
commitee4512ed481a126dadd33334186e0e759d7f2f47 (patch)
tree4bc0418115d44b1833c1d24d2ac1c92f067b7ad3 /trace2/tr2_cfg.c
parente544221d97a57a9be7ba18a0df52a15b4cc76f97 (diff)
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trace2: create new combined trace facility
Create a new unified tracing facility for git. The eventual intent is to replace the current trace_printf* and trace_performance* routines with a unified set of git_trace2* routines. In addition to the usual printf-style API, trace2 provides higer-level event verbs with fixed-fields allowing structured data to be written. This makes post-processing and analysis easier for external tools. Trace2 defines 3 output targets. These are set using the environment variables "GIT_TR2", "GIT_TR2_PERF", and "GIT_TR2_EVENT". These may be set to "1" or to an absolute pathname (just like the current GIT_TRACE). * GIT_TR2 is intended to be a replacement for GIT_TRACE and logs command summary data. * GIT_TR2_PERF is intended as a replacement for GIT_TRACE_PERFORMANCE. It extends the output with columns for the command process, thread, repo, absolute and relative elapsed times. It reports events for child process start/stop, thread start/stop, and per-thread function nesting. * GIT_TR2_EVENT is a new structured format. It writes event data as a series of JSON records. Calls to trace2 functions log to any of the 3 output targets enabled without the need to call different trace_printf* or trace_performance* routines. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'trace2/tr2_cfg.c')
-rw-r--r--trace2/tr2_cfg.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/trace2/tr2_cfg.c b/trace2/tr2_cfg.c
new file mode 100644
index 0000000..b329921
--- /dev/null
+++ b/trace2/tr2_cfg.c
@@ -0,0 +1,90 @@
+#include "cache.h"
+#include "config.h"
+#include "tr2_cfg.h"
+
+#define TR2_ENVVAR_CFG_PARAM "GIT_TR2_CONFIG_PARAMS"
+
+static struct strbuf **tr2_cfg_patterns;
+static int tr2_cfg_count_patterns;
+static int tr2_cfg_loaded;
+
+/*
+ * Parse a string containing a comma-delimited list of config keys
+ * or wildcard patterns into a list of strbufs.
+ */
+static int tr2_cfg_load_patterns(void)
+{
+ struct strbuf **s;
+ const char *envvar;
+
+ if (tr2_cfg_loaded)
+ return tr2_cfg_count_patterns;
+ tr2_cfg_loaded = 1;
+
+ envvar = getenv(TR2_ENVVAR_CFG_PARAM);
+ if (!envvar || !*envvar)
+ return tr2_cfg_count_patterns;
+
+ tr2_cfg_patterns = strbuf_split_buf(envvar, strlen(envvar), ',', -1);
+ for (s = tr2_cfg_patterns; *s; s++) {
+ struct strbuf *buf = *s;
+
+ if (buf->len && buf->buf[buf->len - 1] == ',')
+ strbuf_setlen(buf, buf->len - 1);
+ strbuf_trim_trailing_newline(*s);
+ strbuf_trim(*s);
+ }
+
+ tr2_cfg_count_patterns = s - tr2_cfg_patterns;
+ return tr2_cfg_count_patterns;
+}
+
+void tr2_cfg_free_patterns(void)
+{
+ if (tr2_cfg_patterns)
+ strbuf_list_free(tr2_cfg_patterns);
+ tr2_cfg_count_patterns = 0;
+ tr2_cfg_loaded = 0;
+}
+
+struct tr2_cfg_data {
+ const char *file;
+ int line;
+};
+
+/*
+ * See if the given config key matches any of our patterns of interest.
+ */
+static int tr2_cfg_cb(const char *key, const char *value, void *d)
+{
+ struct strbuf **s;
+ struct tr2_cfg_data *data = (struct tr2_cfg_data *)d;
+
+ for (s = tr2_cfg_patterns; *s; s++) {
+ struct strbuf *buf = *s;
+ int wm = wildmatch(buf->buf, key, WM_CASEFOLD);
+ if (wm == WM_MATCH) {
+ trace2_def_param_fl(data->file, data->line, key, value);
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+void tr2_cfg_list_config_fl(const char *file, int line)
+{
+ struct tr2_cfg_data data = { file, line };
+
+ if (tr2_cfg_load_patterns() > 0)
+ read_early_config(tr2_cfg_cb, &data);
+}
+
+void tr2_cfg_set_fl(const char *file, int line, const char *key,
+ const char *value)
+{
+ struct tr2_cfg_data data = { file, line };
+
+ if (tr2_cfg_load_patterns() > 0)
+ tr2_cfg_cb(key, value, &data);
+}