| /* |
| * |
| * Copyright 2015, Google Inc. |
| * 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. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * 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 "src/core/lib/debug/trace.h" |
| |
| #include <string.h> |
| |
| #include <grpc/grpc.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include "src/core/lib/support/env.h" |
| |
| typedef struct tracer { |
| const char *name; |
| int *flag; |
| struct tracer *next; |
| } tracer; |
| static tracer *tracers; |
| |
| void grpc_register_tracer(const char *name, int *flag) { |
| tracer *t = gpr_malloc(sizeof(*t)); |
| t->name = name; |
| t->flag = flag; |
| t->next = tracers; |
| *flag = 0; |
| tracers = t; |
| } |
| |
| static void add(const char *beg, const char *end, char ***ss, size_t *ns) { |
| size_t n = *ns; |
| size_t np = n + 1; |
| char *s; |
| size_t len; |
| GPR_ASSERT(end >= beg); |
| len = (size_t)(end - beg); |
| s = gpr_malloc(len + 1); |
| memcpy(s, beg, len); |
| s[len] = 0; |
| *ss = gpr_realloc(*ss, sizeof(char **) * np); |
| (*ss)[n] = s; |
| *ns = np; |
| } |
| |
| static void split(const char *s, char ***ss, size_t *ns) { |
| const char *c = strchr(s, ','); |
| if (c == NULL) { |
| add(s, s + strlen(s), ss, ns); |
| } else { |
| add(s, c, ss, ns); |
| split(c + 1, ss, ns); |
| } |
| } |
| |
| static void parse(const char *s) { |
| char **strings = NULL; |
| size_t nstrings = 0; |
| size_t i; |
| split(s, &strings, &nstrings); |
| |
| for (i = 0; i < nstrings; i++) { |
| grpc_tracer_set_enabled(strings[i], 1); |
| } |
| |
| for (i = 0; i < nstrings; i++) { |
| gpr_free(strings[i]); |
| } |
| gpr_free(strings); |
| } |
| |
| void grpc_tracer_init(const char *env_var) { |
| char *e = gpr_getenv(env_var); |
| if (e != NULL) { |
| parse(e); |
| gpr_free(e); |
| } |
| } |
| |
| void grpc_tracer_shutdown(void) { |
| while (tracers) { |
| tracer *t = tracers; |
| tracers = t->next; |
| gpr_free(t); |
| } |
| } |
| |
| int grpc_tracer_set_enabled(const char *name, int enabled) { |
| tracer *t; |
| if (0 == strcmp(name, "all")) { |
| for (t = tracers; t; t = t->next) { |
| *t->flag = 1; |
| } |
| } else { |
| int found = 0; |
| for (t = tracers; t; t = t->next) { |
| if (0 == strcmp(name, t->name)) { |
| *t->flag = enabled; |
| found = 1; |
| } |
| } |
| if (!found) { |
| gpr_log(GPR_ERROR, "Unknown trace var: '%s'", name); |
| return 0; /* early return */ |
| } |
| } |
| return 1; |
| } |