83 lines
2.6 KiB
Go
83 lines
2.6 KiB
Go
// Copyright 2018-2021 CERN
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// In applying this license, CERN does not waive the privileges and immunities
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// granted to it by virtue of its status as an Intergovernmental Organization
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// or submit itself to any jurisdiction.
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package sysinfo
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import (
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"encoding/json"
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"fmt"
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"reflect"
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"github.com/pkg/errors"
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)
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// SystemInformation stores general information about Reva and the system it's running on.
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type SystemInformation struct {
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// Reva holds the main Reva information
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Reva *RevaVersion `json:"reva"`
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}
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var (
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// SysInfo provides global system information.
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SysInfo = &SystemInformation{}
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)
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// ToJSON converts the system information to JSON.
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func (sysInfo *SystemInformation) ToJSON() (string, error) {
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data, err := json.MarshalIndent(sysInfo, "", "\t")
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if err != nil {
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return "", fmt.Errorf("unable to marshal the system information: %v", err)
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}
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return string(data), nil
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}
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func replaceEmptyInfoValues(i interface{}) {
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// Iterate over each field of the given interface and search for "empty" values
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v := reflect.ValueOf(i).Elem()
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for i := 0; i < v.NumField(); i++ {
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// Check if the field is either a struct or a pointer to a struct; in that case, process the field recursively
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f := v.Field(i)
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if f.Kind() == reflect.Struct || (f.Kind() == reflect.Ptr && f.Elem().Kind() == reflect.Struct) {
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replaceEmptyInfoValues(f.Interface())
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} else if f.CanSet() { // Replace empty values with something more meaningful
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if f.Kind() == reflect.String {
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if len(f.String()) == 0 {
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f.SetString("(Unknown)")
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}
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}
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}
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}
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}
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// InitSystemInfo initializes the global system information object and also registers the corresponding metrics.
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func InitSystemInfo(revaVersion *RevaVersion) error {
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SysInfo = &SystemInformation{
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Reva: revaVersion,
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}
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// Replace any empty values in the system information by more meaningful ones
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replaceEmptyInfoValues(SysInfo)
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// Register the system information metrics, as the necessary system info object has been filled out
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if err := registerSystemInfoMetrics(); err != nil {
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return errors.Wrap(err, "unable to register the system info metrics")
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}
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return nil
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}
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