2648fb1bb1
Done with: ack '2019+' -l | xargs sed -i -e 's/2019+/2020+/g' Checked manually with: git add -p Hello to future James from 2021, and Happy Hacking!
108 lines
4.2 KiB
Go
108 lines
4.2 KiB
Go
// Mgmt
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// Copyright (C) 2013-2020+ 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 strmap
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import (
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"context"
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"fmt"
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"strings"
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"github.com/purpleidea/mgmt/etcd/interfaces"
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"github.com/purpleidea/mgmt/util"
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"github.com/purpleidea/mgmt/util/errwrap"
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etcd "go.etcd.io/etcd/clientv3"
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etcdutil "go.etcd.io/etcd/clientv3/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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// WatchStrMap 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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func WatchStrMap(ctx context.Context, client interfaces.Client, key string) (chan error, error) {
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// new key structure is $NS/strings/$key/$hostname = $data
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path := fmt.Sprintf("%s/strings/%s", ns, key)
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return client.Watcher(ctx, path, etcd.WithPrefix())
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}
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// GetStrMap collects all of the strings which match a namespace in etcd.
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func GetStrMap(ctx context.Context, client interfaces.Client, hostnameFilter []string, key string) (map[string]string, error) {
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// old key structure is $NS/strings/$hostname/$key = $data
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// new key structure is $NS/strings/$key/$hostname = $data
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// FIXME: if we have the $key as the last token (old key structure), we
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// can allow the key to contain the slash char, otherwise we need to
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// verify that one isn't present in the input string.
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path := fmt.Sprintf("%s/strings/%s", ns, key)
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keyMap, err := client.Get(ctx, path, etcd.WithPrefix(), etcd.WithSort(etcd.SortByKey, etcd.SortAscend))
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if err != nil {
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return nil, errwrap.Wrapf(err, "could not get strings in: %s", key)
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}
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result := make(map[string]string)
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for key, val := range keyMap {
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if !strings.HasPrefix(key, path) { // sanity check
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continue
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}
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str := strings.Split(key[len(path):], "/")
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if len(str) != 2 {
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return nil, fmt.Errorf("unexpected chunk count of %d", len(str))
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}
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_, hostname := str[0], str[1]
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if hostname == "" {
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return nil, fmt.Errorf("unexpected chunk length of %d", len(hostname))
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}
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// FIXME: ideally this would be a server side filter instead!
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if len(hostnameFilter) > 0 && !util.StrInList(hostname, hostnameFilter) {
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continue
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}
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//log.Printf("Etcd: GetStr(%s): (Hostname, Data): (%s, %s)", key, hostname, val)
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result[hostname] = val
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}
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return result, nil
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}
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// SetStrMap sets a key and hostname pair to a certain value. If the value is
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// nil, 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 SetStrMap(ctx context.Context, client interfaces.Client, hostname, key string, data *string) error {
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// key structure is $NS/strings/$key/$hostname = $data
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path := fmt.Sprintf("%s/strings/%s/%s", ns, key, hostname)
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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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