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config.go
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config.go
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// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package config
import (
"os"
zanzibar "github.com/uber/zanzibar/runtime"
)
// EnvConfig map from environment variable to config key and data type
type EnvConfig map[string]struct {
Key string `json:"key"`
DataType string `json:"dataType"`
}
type RoutingConfig struct {
HeaderName string `yaml:"headerName" json:"headerName"`
HeaderValue string `yaml:"headerValue" json:"headerValue"`
ServiceName string `yaml:"serviceName" json:"serviceName"`
RoutingDelegate *string `yaml:"rd,omitempty" json:"rd,omitempty"`
}
type ServiceRouting struct {
IP string `yaml:"ip" json:"ip"`
Port int `yaml:"port" json:"port"`
}
type AlternateServiceDetail struct {
RoutingConfigs []RoutingConfig `yaml:"routingConfigs" json:"routingConfigs"`
ServicesDetailMap map[string]*ServiceRouting `yaml:"servicesDetail" json:"servicesDetail"`
}
// NewRuntimeConfigOrDie returns a static config struct
// that is pre-set with the service configuration defaults
// and overridden by service.env.config
func NewRuntimeConfigOrDie(
files []string,
seedConfig map[string]interface{},
) *zanzibar.StaticConfig {
defaultConfig, err := defaultConfig()
if err != nil {
panic("error getting default config")
}
serviceConfig := make([]*zanzibar.ConfigOption, 0, len(files)+1)
serviceConfig = append(serviceConfig, defaultConfig)
for _, configFilePath := range files {
serviceConfig = append(serviceConfig, zanzibar.ConfigFilePath(configFilePath))
}
staticConfig := zanzibar.NewStaticConfigOrDie(serviceConfig, seedConfig)
setEnvConfig(staticConfig)
return staticConfig
}
func defaultConfig() (*zanzibar.ConfigOption, error) {
bytes, err := Asset("production.yaml")
if err == nil {
return zanzibar.ConfigFileContents(bytes), nil
}
// try json version
bytes, err = Asset("production.json")
if err == nil {
return zanzibar.ConfigFileContents(bytes), nil
}
return nil, err
}
func setEnvConfig(cfg *zanzibar.StaticConfig) {
var envConfig EnvConfig
cfg.MustGetStruct("service.env.config", &envConfig)
for envVar, configKey := range envConfig {
if value, ok := os.LookupEnv(envVar); ok {
cfg.SetConfigValueOrDie(
configKey.Key, []byte(value), configKey.DataType)
}
}
}