/
config.go
118 lines (94 loc) · 2.87 KB
/
config.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
package pubsubmon
import (
"encoding/json"
"errors"
"time"
"github.com/kebohan1/ipfs-cluster/config"
"github.com/kelseyhightower/envconfig"
)
const configKey = "pubsubmon"
const envConfigKey = "cluster_pubsubmon"
// Default values for this Config.
const (
DefaultCheckInterval = 15 * time.Second
DefaultFailureThreshold = 3.0
)
// Config allows to initialize a Monitor and customize some parameters.
type Config struct {
config.Saver
CheckInterval time.Duration
// FailureThreshold indicates when a peer should be considered failed.
// The greater the threshold value the more leniency is granted.
// A value between 2.0 and 4.0 is suggested for the threshold.
FailureThreshold float64
}
type jsonConfig struct {
CheckInterval string `json:"check_interval"`
FailureThreshold *float64 `json:"failure_threshold"`
}
// ConfigKey provides a human-friendly identifier for this type of Config.
func (cfg *Config) ConfigKey() string {
return configKey
}
// Default sets the fields of this Config to sensible values.
func (cfg *Config) Default() error {
cfg.CheckInterval = DefaultCheckInterval
cfg.FailureThreshold = DefaultFailureThreshold
return nil
}
// ApplyEnvVars fills in any Config fields found
// as environment variables.
func (cfg *Config) ApplyEnvVars() error {
jcfg := cfg.toJSONConfig()
err := envconfig.Process(envConfigKey, jcfg)
if err != nil {
return err
}
return cfg.applyJSONConfig(jcfg)
}
// Validate checks that the fields of this Config have working values,
// at least in appearance.
func (cfg *Config) Validate() error {
if cfg.CheckInterval <= 0 {
return errors.New("pubsubmon.check_interval too low")
}
if cfg.FailureThreshold <= 0 {
return errors.New("pubsubmon.failure_threshold too low")
}
return nil
}
// LoadJSON sets the fields of this Config to the values defined by the JSON
// representation of it, as generated by ToJSON.
func (cfg *Config) LoadJSON(raw []byte) error {
jcfg := &jsonConfig{}
err := json.Unmarshal(raw, jcfg)
if err != nil {
logger.Error("Error unmarshaling pubsubmon monitor config")
return err
}
cfg.Default()
return cfg.applyJSONConfig(jcfg)
}
func (cfg *Config) applyJSONConfig(jcfg *jsonConfig) error {
interval, _ := time.ParseDuration(jcfg.CheckInterval)
cfg.CheckInterval = interval
if jcfg.FailureThreshold != nil {
cfg.FailureThreshold = *jcfg.FailureThreshold
}
return cfg.Validate()
}
// ToJSON generates a human-friendly JSON representation of this Config.
func (cfg *Config) ToJSON() ([]byte, error) {
jcfg := cfg.toJSONConfig()
return json.MarshalIndent(jcfg, "", " ")
}
func (cfg *Config) toJSONConfig() *jsonConfig {
return &jsonConfig{
CheckInterval: cfg.CheckInterval.String(),
FailureThreshold: &cfg.FailureThreshold,
}
}
// ToDisplayJSON returns JSON config as a string.
func (cfg *Config) ToDisplayJSON() ([]byte, error) {
return config.DisplayJSON(cfg.toJSONConfig())
}