common admin: port mgr module calls from cephfs/admin

Signed-off-by: John Mulligan <jmulligan@redhat.com>

common/admin/manager/module.go

@@ -0,0 +1,65 @@
+package manager
+
+import (
+	"github.com/ceph/go-ceph/internal/commands"
+)
+
+// EnableModule will enable the specified manager module.
+//
+// Similar To:
+//  ceph mgr module enable <module> [--force]
+func (fsa *MgrAdmin) EnableModule(module string, force bool) error {
+	m := map[string]string{
+		"prefix": "mgr module enable",
+		"module": module,
+		"format": "json",
+	}
+	if force {
+		m["force"] = "--force"
+	}
+	// Why is this _only_ part of the mon command json? You'd think a mgr
+	// command would be available as a MgrCommand but I couldn't figure it out.
+	return commands.MarshalMonCommand(fsa.conn, m).NoData().End()
+}
+
+// DisableModule will disable the specified manager module.
+//
+// Similar To:
+//  ceph mgr module disable <module>
+func (fsa *MgrAdmin) DisableModule(module string) error {
+	m := map[string]string{
+		"prefix": "mgr module disable",
+		"module": module,
+		"format": "json",
+	}
+	return commands.MarshalMonCommand(fsa.conn, m).NoData().End()
+}
+
+type ModuleInfo struct {
+	EnabledModules []string `json:"enabled_modules"`
+	//DisabledModules []string `json:"disabled_modules"`
+	// DisabledModules is documented in ceph as a list of string
+	// but that's not what comes back from the server (on pacific).
+	// Since we don't need this today, we're just going to ignore
+	// it, but if we ever want to support this for external consumers
+	// we'll need to figure out the real structure of this.
+}
+
+func parseModuleInfo(res commands.Response) (*ModuleInfo, error) {
+	m := &ModuleInfo{}
+	if err := res.NoStatus().Unmarshal(m).End(); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// ListModules returns moduleInfo or error. it is not exported because
+// this is really not a cephfs specific thing but we needed it
+// for cephfs tests. maybe lift it somewhere else someday.
+func (fsa *MgrAdmin) listModules() (*ModuleInfo, error) {
+	m := map[string]string{
+		"prefix": "mgr module ls",
+		"format": "json",
+	}
+	return parseModuleInfo(commands.MarshalMonCommand(fsa.conn, m))
+}