From ee4512ed481a126dadd33334186e0e759d7f2f47 Mon Sep 17 00:00:00 2001 From: Jeff Hostetler Date: Fri, 22 Feb 2019 14:25:01 -0800 Subject: 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 Signed-off-by: Junio C Hamano --- trace2/tr2_cfg.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 trace2/tr2_cfg.c (limited to 'trace2/tr2_cfg.c') diff --git a/trace2/tr2_cfg.c b/trace2/tr2_cfg.c new file mode 100644 index 0000000000..b329921ac5 --- /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); +} -- cgit v1.2.3