/
main.go
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/
main.go
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/*******************************************************************************
*
* Copyright 2022 SAP SE
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You should have received a copy of the License along with this
* program. If not, you may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*******************************************************************************/
package main
import (
"github.com/sapcc/go-bits/logg"
"github.com/sapcc/go-bits/must"
"github.com/spf13/viper"
"github.com/sapcc/hermes/internal/api"
"github.com/sapcc/hermes/internal/identity"
"github.com/sapcc/hermes/internal/storage"
"github.com/sapcc/hermes/internal/util"
)
func main() {
setDefaultConfig()
bindEnvVariables()
// Validate required Keystone authentication details
if viper.GetString("keystone.username") == "" {
logg.Fatal("HERMES_OS_USERNAME is not set")
}
if viper.GetString("keystone.password") == "" {
logg.Fatal("HERMES_OS_PASSWORD is not set")
}
if viper.GetString("elasticsearch.url") == "" {
logg.Fatal("HERMES_ES_URL is not set")
}
if viper.GetString("keystone.auth_url") == "" {
logg.Fatal("HERMES_OS_AUTH_URL is not set")
}
logg.ShowDebug = viper.GetBool("hermes.debug")
keystoneDriver := configuredKeystoneDriver()
storageDriver := configuredStorageDriver()
readPolicy()
must.Succeed(api.Server(keystoneDriver, storageDriver))
}
func setDefaultConfig() {
viper.SetDefault("hermes.debug", false)
viper.SetDefault("hermes.keystone_driver", "keystone")
viper.SetDefault("hermes.storage_driver", "elasticsearch")
viper.SetDefault("hermes.PolicyFilePath", "/etc/policy.json")
viper.SetDefault("keystone.user_domain_name", "Default")
viper.SetDefault("keystone.project_name", "service")
viper.SetDefault("keystone.project_domain_name", "Default")
viper.SetDefault("keystone.token_cache_time", 900)
viper.SetDefault("keystone.memcached_servers", "")
viper.SetDefault("API.ListenAddress", "0.0.0.0:8788")
// index.max_result_window defaults to 10000, as per
// https://www.elastic.co/guide/en/elasticsearch/reference/current/index-modules.html
// Increasing max_result_window to 20000, with corresponding changes to Elasticsearch to handle the increase.
viper.SetDefault("elasticsearch.max_result_window", "20000")
}
// bindEnvVariables binds environment variables to viper keys
func bindEnvVariables() {
must.Succeed(viper.BindEnv("hermes.keystone_driver", "HERMES_KEYSTONE_DRIVER"))
must.Succeed(viper.BindEnv("hermes.storage_driver", "HERMES_STORAGE_DRIVER"))
must.Succeed(viper.BindEnv("hermes.PolicyFilePath", "HERMES_POLICY_FILE_PATH"))
must.Succeed(viper.BindEnv("elasticsearch.url", "HERMES_ES_URL"))
must.Succeed(viper.BindEnv("keystone.auth_url", "HERMES_OS_AUTH_URL"))
must.Succeed(viper.BindEnv("keystone.username", "HERMES_OS_USERNAME"))
must.Succeed(viper.BindEnv("keystone.password", "HERMES_OS_PASSWORD"))
must.Succeed(viper.BindEnv("keystone.user_domain_name", "HERMES_OS_USER_DOMAIN_NAME"))
must.Succeed(viper.BindEnv("keystone.project_name", "HERMES_OS_PROJECT_NAME"))
must.Succeed(viper.BindEnv("keystone.project_domain_name", "HERMES_OS_PROJECT_DOMAIN_NAME"))
must.Succeed(viper.BindEnv("keystone.token_cache_time", "HERMES_OS_TOKEN_CACHE_TIME"))
must.Succeed(viper.BindEnv("keystone.memcached_servers", "HERMES_OS_MEMCACHED_SERVERS"))
must.Succeed(viper.BindEnv("API.ListenAddress", "HERMES_API_LISTEN_ADDRESS"))
must.Succeed(viper.BindEnv("elasticsearch.username", "HERMES_ES_USERNAME"))
must.Succeed(viper.BindEnv("elasticsearch.password", "HERMES_ES_PASSWORD"))
must.Succeed(viper.BindEnv("elasticsearch.max_result_window", "HERMES_ES_MAX_RESULT_WINDOW"))
}
var keystoneIdentity = identity.Keystone{}
var mockIdentity = identity.Mock{}
func configuredKeystoneDriver() identity.Identity {
driverName := viper.GetString("hermes.keystone_driver")
switch driverName {
case "keystone":
return keystoneIdentity
case "mock":
return mockIdentity
default:
logg.Error("Couldn't match a keystone driver for configured value \"%s\"", driverName)
return nil
}
}
var elasticSearchStorage = storage.ElasticSearch{}
var mockStorage = storage.Mock{}
func configuredStorageDriver() storage.Storage {
driverName := viper.GetString("hermes.storage_driver")
switch driverName {
case "elasticsearch":
return elasticSearchStorage
case "mock":
return mockStorage
default:
logg.Error("Couldn't match a storage driver for configured value \"%s\"", driverName)
return nil
}
}
func readPolicy() {
policyFilePath := viper.GetString("hermes.PolicyFilePath")
if policyFilePath != "" {
policyEnforcer, err := util.LoadPolicyFile(policyFilePath)
if err != nil {
logg.Fatal(err.Error())
}
if policyEnforcer != nil {
viper.Set("hermes.PolicyEnforcer", policyEnforcer)
}
}
}