1 /* Copyright 2016 The TensorFlow Authors. All Rights Reserved.
2
3 Licensed under the Apache License, Version 2.0 (the "License");
4 you may not use this file except in compliance with the License.
5 You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9 Unless required by applicable law or agreed to in writing, software
10 distributed under the License is distributed on an "AS IS" BASIS,
11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 See the License for the specific language governing permissions and
13 limitations under the License.
14 ==============================================================================*/
15
16 #include "tensorflow/core/util/env_var.h"
17
18 #include <stdlib.h>
19
20 #include "tensorflow/core/platform/errors.h"
21 #include "tensorflow/core/platform/logging.h"
22 #include "tensorflow/core/platform/numbers.h"
23 #include "tensorflow/core/platform/str_util.h"
24 #include "tensorflow/core/platform/strcat.h"
25
26 namespace tensorflow {
27
ReadBoolFromEnvVar(StringPiece env_var_name,bool default_val,bool * value)28 Status ReadBoolFromEnvVar(StringPiece env_var_name, bool default_val,
29 bool* value) {
30 *value = default_val;
31 const char* tf_env_var_val = getenv(string(env_var_name).c_str());
32 if (tf_env_var_val == nullptr) {
33 return OkStatus();
34 }
35 string str_value = absl::AsciiStrToLower(tf_env_var_val);
36 if (str_value == "0" || str_value == "false") {
37 *value = false;
38 return OkStatus();
39 } else if (str_value == "1" || str_value == "true") {
40 *value = true;
41 return OkStatus();
42 }
43 return errors::InvalidArgument(strings::StrCat(
44 "Failed to parse the env-var ${", env_var_name, "} into bool: ",
45 tf_env_var_val, ". Use the default value: ", default_val));
46 }
47
ReadInt64FromEnvVar(StringPiece env_var_name,int64_t default_val,int64_t * value)48 Status ReadInt64FromEnvVar(StringPiece env_var_name, int64_t default_val,
49 int64_t* value) {
50 *value = default_val;
51 const char* tf_env_var_val = getenv(string(env_var_name).c_str());
52 if (tf_env_var_val == nullptr) {
53 return OkStatus();
54 }
55 if (strings::safe_strto64(tf_env_var_val, value)) {
56 return OkStatus();
57 }
58 return errors::InvalidArgument(strings::StrCat(
59 "Failed to parse the env-var ${", env_var_name, "} into int64: ",
60 tf_env_var_val, ". Use the default value: ", default_val));
61 }
62
ReadFloatFromEnvVar(StringPiece env_var_name,float default_val,float * value)63 Status ReadFloatFromEnvVar(StringPiece env_var_name, float default_val,
64 float* value) {
65 *value = default_val;
66 const char* tf_env_var_val = getenv(string(env_var_name).c_str());
67 if (tf_env_var_val == nullptr) {
68 return OkStatus();
69 }
70 if (strings::safe_strtof(tf_env_var_val, value)) {
71 return OkStatus();
72 }
73 return errors::InvalidArgument(strings::StrCat(
74 "Failed to parse the env-var ${", env_var_name, "} into float: ",
75 tf_env_var_val, ". Use the default value: ", default_val));
76 }
77
ReadStringFromEnvVar(StringPiece env_var_name,StringPiece default_val,string * value)78 Status ReadStringFromEnvVar(StringPiece env_var_name, StringPiece default_val,
79 string* value) {
80 const char* tf_env_var_val = getenv(string(env_var_name).c_str());
81 if (tf_env_var_val != nullptr) {
82 *value = tf_env_var_val;
83 } else {
84 *value = string(default_val);
85 }
86 return OkStatus();
87 }
88
ReadStringsFromEnvVar(StringPiece env_var_name,StringPiece default_val,std::vector<string> * value)89 Status ReadStringsFromEnvVar(StringPiece env_var_name, StringPiece default_val,
90 std::vector<string>* value) {
91 string str_val;
92 TF_RETURN_IF_ERROR(ReadStringFromEnvVar(env_var_name, default_val, &str_val));
93 *value = str_util::Split(str_val, ',');
94 return OkStatus();
95 }
96
97 } // namespace tensorflow
98