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etcd: Rewrite embed etcd implementation

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This is a giant cleanup of the etcd code. The earlier version was
written when I was less experienced with golang.

This is still not perfect, and does contain some races, but at least
it's a decent base to start from. The automatic elastic clustering
should be considered an experimental feature. If you need a more
battle-tested cluster, then you should manage etcd manually and point
mgmt at your existing cluster.
This commit is contained in:
James Shubin
2018-05-05 17:35:08 -04:00
parent fb275d9537
commit a5842a41b2
56 changed files with 5459 additions and 2654 deletions
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28
engine/world.go
View File

@@ -18,6 +18,8 @@
package engine
import (
"context"
"github.com/purpleidea/mgmt/etcd/scheduler"
)
@@ -25,22 +27,26 @@ import (
// the GAPI to store state and exchange information throughout the cluster. It
// is the interface each machine uses to communicate with the rest of the world.
type World interface { // TODO: is there a better name for this interface?
ResWatch() chan error
ResExport([]Res) error
ResWatch(context.Context) (chan error, error)
ResExport(context.Context, []Res) error
// FIXME: should this method take a "filter" data struct instead of many args?
ResCollect(hostnameFilter, kindFilter []string) ([]Res, error)
ResCollect(ctx context.Context, hostnameFilter, kindFilter []string) ([]Res, error)
StrWatch(namespace string) chan error
IdealClusterSizeWatch(context.Context) (chan error, error)
IdealClusterSizeGet(context.Context) (uint16, error)
IdealClusterSizeSet(context.Context, uint16) (bool, error)
StrWatch(ctx context.Context, namespace string) (chan error, error)
StrIsNotExist(error) bool
StrGet(namespace string) (string, error)
StrSet(namespace, value string) error
StrDel(namespace string) error
StrGet(ctx context.Context, namespace string) (string, error)
StrSet(ctx context.Context, namespace, value string) error
StrDel(ctx context.Context, namespace string) error
// XXX: add the exchange primitives in here directly?
StrMapWatch(namespace string) chan error
StrMapGet(namespace string) (map[string]string, error)
StrMapSet(namespace, value string) error
StrMapDel(namespace string) error
StrMapWatch(ctx context.Context, namespace string) (chan error, error)
StrMapGet(ctx context.Context, namespace string) (map[string]string, error)
StrMapSet(ctx context.Context, namespace, value string) error
StrMapDel(ctx context.Context, namespace string) error
Scheduler(namespace string, opts ...scheduler.Option) (*scheduler.Result, error)