1 // Copyright 2023 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "components/miracle_parameter/common/public/miracle_parameter.h"
6
7 #include "base/command_line.h"
8 #include "base/strings/strcat.h"
9 #include "base/system/sys_info.h"
10
11 namespace miracle_parameter {
12
13 namespace {
14
GetFieldTrialParamByFeatureAsString(const base::Feature & feature,const std::string & param_name,const std::string & default_value)15 std::string GetFieldTrialParamByFeatureAsString(
16 const base::Feature& feature,
17 const std::string& param_name,
18 const std::string& default_value) {
19 const std::string value =
20 base::GetFieldTrialParamValueByFeature(feature, param_name);
21 return value.empty() ? default_value : value;
22 }
23
24 } // namespace
25
GetParamNameWithSuffix(const std::string & param_name)26 std::string GetParamNameWithSuffix(const std::string& param_name) {
27 // `base::SysInfo::AmountOfPhysicalMemoryMB()` refers to CommandLine
28 // internally. If the CommandLine is not initialized, we return early to avoid
29 // a crash.
30 if (!base::CommandLine::InitializedForCurrentProcess()) {
31 return param_name;
32 }
33 int physical_memory_mb = base::SysInfo::AmountOfPhysicalMemoryMB();
34 const char* suffix =
35 physical_memory_mb < kMiracleParameterMemory512MB ? "ForLessThan512MB"
36 : physical_memory_mb < kMiracleParameterMemory1GB ? "For512MBTo1GB"
37 : physical_memory_mb < kMiracleParameterMemory2GB ? "For1GBTo2GB"
38 : physical_memory_mb < kMiracleParameterMemory4GB ? "For2GBTo4GB"
39 : physical_memory_mb < kMiracleParameterMemory8GB ? "For4GBTo8GB"
40 : physical_memory_mb < kMiracleParameterMemory16GB ? "For8GBTo16GB"
41 : "For16GBAndAbove";
42 return base::StrCat({param_name, suffix});
43 }
44
GetMiracleParameterAsString(const base::Feature & feature,const std::string & param_name,const std::string & default_value)45 std::string GetMiracleParameterAsString(const base::Feature& feature,
46 const std::string& param_name,
47 const std::string& default_value) {
48 return GetFieldTrialParamByFeatureAsString(
49 feature, GetParamNameWithSuffix(param_name),
50 GetFieldTrialParamByFeatureAsString(feature, param_name, default_value));
51 }
52
GetMiracleParameterAsDouble(const base::Feature & feature,const std::string & param_name,double default_value)53 double GetMiracleParameterAsDouble(const base::Feature& feature,
54 const std::string& param_name,
55 double default_value) {
56 return base::GetFieldTrialParamByFeatureAsDouble(
57 feature, GetParamNameWithSuffix(param_name),
58 base::GetFieldTrialParamByFeatureAsDouble(feature, param_name,
59 default_value));
60 }
61
GetMiracleParameterAsInt(const base::Feature & feature,const std::string & param_name,int default_value)62 int GetMiracleParameterAsInt(const base::Feature& feature,
63 const std::string& param_name,
64 int default_value) {
65 return base::GetFieldTrialParamByFeatureAsInt(
66 feature, GetParamNameWithSuffix(param_name),
67 base::GetFieldTrialParamByFeatureAsInt(feature, param_name,
68 default_value));
69 }
70
GetMiracleParameterAsBool(const base::Feature & feature,const std::string & param_name,bool default_value)71 bool GetMiracleParameterAsBool(const base::Feature& feature,
72 const std::string& param_name,
73 bool default_value) {
74 return base::GetFieldTrialParamByFeatureAsBool(
75 feature, GetParamNameWithSuffix(param_name),
76 base::GetFieldTrialParamByFeatureAsBool(feature, param_name,
77 default_value));
78 }
79
GetMiracleParameterAsTimeDelta(const base::Feature & feature,const std::string & param_name,base::TimeDelta default_value)80 base::TimeDelta GetMiracleParameterAsTimeDelta(const base::Feature& feature,
81 const std::string& param_name,
82 base::TimeDelta default_value) {
83 return base::GetFieldTrialParamByFeatureAsTimeDelta(
84 feature, GetParamNameWithSuffix(param_name),
85 base::GetFieldTrialParamByFeatureAsTimeDelta(feature, param_name,
86 default_value));
87 }
88
89 } // namespace miracle_parameter
90