a7624a2bf9
Done with: ack '2022+' -l | xargs sed -i -e 's/2022+/2023+/g' Checked manually with: git add -p Hello to future James from 2024, and Happy Hacking!
98 lines
3.7 KiB
Go
98 lines
3.7 KiB
Go
// Mgmt
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// Copyright (C) 2013-2023+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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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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//
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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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//
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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 <http://www.gnu.org/licenses/>.
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package str
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import (
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"context"
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"fmt"
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"github.com/purpleidea/mgmt/etcd/interfaces"
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"github.com/purpleidea/mgmt/util/errwrap"
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etcd "go.etcd.io/etcd/client/v3"
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etcdutil "go.etcd.io/etcd/client/v3/clientv3util"
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)
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const (
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ns = "" // in case we want to add one back in
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)
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// WatchStr returns a channel which spits out events on key activity.
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// FIXME: It should close the channel when it's done, and spit out errors when
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// something goes wrong.
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// XXX: since the caller of this (via the World API) has no way to tell it it's
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// done, does that mean we leak go-routines since it might still be running, but
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// perhaps even blocked??? Could this cause a dead-lock? Should we instead
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// return some sort of struct which has a close method with it to ask for a
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// shutdown?
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func WatchStr(ctx context.Context, client interfaces.Client, key string) (chan error, error) {
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// new key structure is $NS/strings/$key = $data
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path := fmt.Sprintf("%s/strings/%s", ns, key)
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return client.Watcher(ctx, path)
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}
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// GetStr collects the string which matches a global namespace in etcd.
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func GetStr(ctx context.Context, client interfaces.Client, key string) (string, error) {
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// new key structure is $NS/strings/$key = $data
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path := fmt.Sprintf("%s/strings/%s", ns, key)
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keyMap, err := client.Get(ctx, path, etcd.WithPrefix())
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if err != nil {
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return "", errwrap.Wrapf(err, "could not get strings in: %s", key)
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}
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if len(keyMap) == 0 {
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return "", interfaces.ErrNotExist
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}
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if count := len(keyMap); count != 1 {
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return "", fmt.Errorf("returned %d entries", count)
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}
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val, exists := keyMap[path]
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if !exists {
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return "", fmt.Errorf("path `%s` is missing", path)
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}
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return val, nil
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}
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// SetStr sets a key and hostname pair to a certain value. If the value is nil,
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// then it deletes the key. Otherwise the value should point to a string.
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// TODO: TTL or delete disconnect?
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func SetStr(ctx context.Context, client interfaces.Client, key string, data *string) error {
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// key structure is $NS/strings/$key = $data
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path := fmt.Sprintf("%s/strings/%s", ns, key)
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ifs := []etcd.Cmp{} // list matching the desired state
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ops := []etcd.Op{} // list of ops in this transaction (then)
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els := []etcd.Op{} // list of ops in this transaction (else)
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if data == nil { // perform a delete
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ifs = append(ifs, etcdutil.KeyExists(path))
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//ifs = append(ifs, etcd.Compare(etcd.Version(path), ">", 0))
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ops = append(ops, etcd.OpDelete(path))
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} else {
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data := *data // get the real value
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ifs = append(ifs, etcd.Compare(etcd.Value(path), "=", data)) // desired state
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els = append(els, etcd.OpPut(path, data))
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}
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// it's important to do this in one transaction, and atomically, because
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// this way, we only generate one watch event, and only when it's needed
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_, err := client.Txn(ctx, ifs, ops, els) // TODO: do we need to look at response?
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return errwrap.Wrapf(err, "could not set strings in: %s", key)
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}
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