Line data    Source code

       1             : /*
       2             :  *
       3             :  * Copyright 2015, Google Inc.
       4             :  * All rights reserved.
       5             :  *
       6             :  * Redistribution and use in source and binary forms, with or without
       7             :  * modification, are permitted provided that the following conditions are
       8             :  * met:
       9             :  *
      10             :  *     * Redistributions of source code must retain the above copyright
      11             :  * notice, this list of conditions and the following disclaimer.
      12             :  *     * Redistributions in binary form must reproduce the above
      13             :  * copyright notice, this list of conditions and the following disclaimer
      14             :  * in the documentation and/or other materials provided with the
      15             :  * distribution.
      16             :  *     * Neither the name of Google Inc. nor the names of its
      17             :  * contributors may be used to endorse or promote products derived from
      18             :  * this software without specific prior written permission.
      19             :  *
      20             :  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      21             :  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      22             :  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      23             :  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      24             :  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      25             :  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      26             :  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      27             :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      28             :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      29             :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      30             :  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      31             :  *
      32             :  */
      33             : 
      34             : #include "src/core/debug/trace.h"
      35             : 
      36             : #include <string.h>
      37             : 
      38             : #include <grpc/grpc.h>
      39             : #include <grpc/support/alloc.h>
      40             : #include <grpc/support/log.h>
      41             : #include "src/core/support/env.h"
      42             : 
      43             : typedef struct tracer {
      44             :   const char *name;
      45             :   int *flag;
      46             :   struct tracer *next;
      47             : } tracer;
      48             : static tracer *tracers;
      49             : 
      50       18659 : void grpc_register_tracer(const char *name, int *flag) {
      51       18659 :   tracer *t = gpr_malloc(sizeof(*t));
      52       18659 :   t->name = name;
      53       18659 :   t->flag = flag;
      54       18659 :   t->next = tracers;
      55       18659 :   *flag = 0;
      56       18659 :   tracers = t;
      57       18659 : }
      58             : 
      59         171 : static void add(const char *beg, const char *end, char ***ss, size_t *ns) {
      60         171 :   size_t n = *ns;
      61         171 :   size_t np = n + 1;
      62             :   char *s;
      63             :   size_t len;
      64         171 :   GPR_ASSERT(end >= beg);
      65         171 :   len = (size_t)(end - beg);
      66         171 :   s = gpr_malloc(len + 1);
      67         171 :   memcpy(s, beg, len);
      68         171 :   s[len] = 0;
      69         171 :   *ss = gpr_realloc(*ss, sizeof(char **) * np);
      70         171 :   (*ss)[n] = s;
      71         171 :   *ns = np;
      72         171 : }
      73             : 
      74         171 : static void split(const char *s, char ***ss, size_t *ns) {
      75         171 :   const char *c = strchr(s, ',');
      76         171 :   if (c == NULL) {
      77          57 :     add(s, s + strlen(s), ss, ns);
      78             :   } else {
      79         114 :     add(s, c, ss, ns);
      80         114 :     split(c + 1, ss, ns);
      81             :   }
      82         171 : }
      83             : 
      84          57 : static void parse(const char *s) {
      85          57 :   char **strings = NULL;
      86          57 :   size_t nstrings = 0;
      87             :   size_t i;
      88          57 :   split(s, &strings, &nstrings);
      89             : 
      90         228 :   for (i = 0; i < nstrings; i++) {
      91         171 :     grpc_tracer_set_enabled(strings[i], 1);
      92             :   }
      93             : 
      94         228 :   for (i = 0; i < nstrings; i++) {
      95         171 :     gpr_free(strings[i]);
      96             :   }
      97          57 :   gpr_free(strings);
      98          57 : }
      99             : 
     100        2501 : void grpc_tracer_init(const char *env_var) {
     101        2501 :   char *e = gpr_getenv(env_var);
     102        2501 :   if (e != NULL) {
     103          57 :     parse(e);
     104          57 :     gpr_free(e);
     105             :   }
     106        2501 : }
     107             : 
     108        2501 : void grpc_tracer_shutdown(void) {
     109       23656 :   while (tracers) {
     110       18654 :     tracer *t = tracers;
     111       18654 :     tracers = t->next;
     112       18654 :     gpr_free(t);
     113             :   }
     114        2501 : }
     115             : 
     116         342 : int grpc_tracer_set_enabled(const char *name, int enabled) {
     117             :   tracer *t;
     118         342 :   if (0 == strcmp(name, "all")) {
     119         914 :     for (t = tracers; t; t = t->next) {
     120         800 :       *t->flag = 1;
     121             :     }
     122             :   } else {
     123         228 :     int found = 0;
     124        1828 :     for (t = tracers; t; t = t->next) {
     125        1600 :       if (0 == strcmp(name, t->name)) {
     126         114 :         *t->flag = enabled;
     127         114 :         found = 1;
     128             :       }
     129             :     }
     130         228 :     if (!found) {
     131         114 :       gpr_log(GPR_ERROR, "Unknown trace var: '%s'", name);
     132         114 :       return 0; /* early return */
     133             :     }
     134             :   }
     135         228 :   return 1;
     136             : }