97 lines
2.5 KiB
Go
97 lines
2.5 KiB
Go
/*
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httpprocwatchd provides HTTP interface to a list of process' statuses
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formatted as JSON.
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Copyright (c) 2021 Alexander "Arav" Andreev <me@arav.top>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package prog
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import (
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"encoding/json"
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"io/ioutil"
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)
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// Configuration holds a list of process names to be tracked and a listen address.
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type Configuration struct {
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ListenAddress string `json:"listen_address"`
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Processes []string `json:"processes"`
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}
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// LoadConfiguration loads configuration from a JSON file.
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func LoadConfiguration(path string) (conf *Configuration, err error) {
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conf = &Configuration{}
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file, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, err
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}
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if err := json.Unmarshal(file, conf); err != nil {
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return nil, err
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}
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return conf, nil
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}
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// StoreConfiguration writes Configuration into a JSON file.
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func StoreConfiguration(path string, conf *Configuration) (err error) {
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config, err := json.Marshal(*conf)
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if err != nil {
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return err
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}
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err = ioutil.WriteFile(path, config, 0644)
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if err != nil {
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return err
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}
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return nil
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}
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// AddProcessToList appends a new given process into a configuration file.
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func AddProcessToList(process string, conf *Configuration, configPath string) error {
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for _, v := range conf.Processes {
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if v == process {
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return ErrIsOnList
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}
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}
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conf.Processes = append(conf.Processes, process)
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if err := StoreConfiguration(configPath, conf); err != nil {
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return err
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}
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return nil
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}
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// RemoveProcessFromList removes a given process from a configuration file.
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func RemoveProcessFromList(process string, conf *Configuration, configPath string) error {
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for k, v := range conf.Processes {
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if v == process {
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newlist := make([]string, len(conf.Processes)-1)
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newlist = append(conf.Processes[:k], conf.Processes[k+1:]...)
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conf.Processes = newlist
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if err := StoreConfiguration(configPath, conf); err != nil {
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return err
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}
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return nil
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}
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}
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return ErrNotFound
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}
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