| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include "src/core/lib/debug/trace.h" |
| |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include "src/core/lib/support/env.h" |
| |
| int grpc_tracer_set_enabled(const char *name, int enabled); |
| |
| typedef struct tracer { |
| grpc_tracer_flag *flag; |
| struct tracer *next; |
| } tracer; |
| static tracer *tracers; |
| |
| #ifdef GRPC_THREADSAFE_TRACER |
| #define TRACER_SET(flag, on) gpr_atm_no_barrier_store(&(flag).value, (on)) |
| #else |
| #define TRACER_SET(flag, on) (flag).value = (on) |
| #endif |
| |
| void grpc_register_tracer(grpc_tracer_flag *flag) { |
| tracer *t = (tracer *)gpr_malloc(sizeof(*t)); |
| t->flag = flag; |
| t->next = tracers; |
| TRACER_SET(*flag, false); |
| 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 = (char *)gpr_malloc(len + 1); |
| memcpy(s, beg, len); |
| s[len] = 0; |
| *ss = (char **)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++) { |
| if (strings[i][0] == '-') { |
| grpc_tracer_set_enabled(strings[i] + 1, 0); |
| } else { |
| grpc_tracer_set_enabled(strings[i], 1); |
| } |
| } |
| |
| for (i = 0; i < nstrings; i++) { |
| gpr_free(strings[i]); |
| } |
| gpr_free(strings); |
| } |
| |
| static void list_tracers() { |
| gpr_log(GPR_DEBUG, "available tracers:"); |
| tracer *t; |
| for (t = tracers; t; t = t->next) { |
| gpr_log(GPR_DEBUG, "\t%s", t->flag->name); |
| } |
| } |
| |
| 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) { |
| TRACER_SET(*t->flag, enabled); |
| } |
| } else if (0 == strcmp(name, "list_tracers")) { |
| list_tracers(); |
| } else if (0 == strcmp(name, "refcount")) { |
| for (t = tracers; t; t = t->next) { |
| if (strstr(t->flag->name, "refcount") != NULL) { |
| TRACER_SET(*t->flag, enabled); |
| } |
| } |
| } else { |
| int found = 0; |
| for (t = tracers; t; t = t->next) { |
| if (0 == strcmp(name, t->flag->name)) { |
| TRACER_SET(*t->flag, enabled); |
| found = 1; |
| } |
| } |
| if (!found) { |
| gpr_log(GPR_ERROR, "Unknown trace var: '%s'", name); |
| return 0; /* early return */ |
| } |
| } |
| return 1; |
| } |