active-active prototyping

Author: taylanisikdemir

Diff for: common/activecluster/manager.go

@@ -0,0 +1,103 @@
+// The MIT License (MIT)
+
+// Copyright (c) 2017-2020 Uber Technologies Inc.
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package activecluster
+
+import (
+	"context"
+
+	"github.com/uber/cadence/common"
+	"github.com/uber/cadence/common/cache"
+	"github.com/uber/cadence/common/cluster"
+	"github.com/uber/cadence/common/log"
+	"github.com/uber/cadence/common/log/tag"
+	"github.com/uber/cadence/common/metrics"
+)
+
+//go:generate mockgen -package $GOPACKAGE -destination manager_mock.go -self_package github.com/uber/cadence/common/activecluster github.com/uber/cadence/common/activecluster Manager
+
+type Manager interface {
+	common.Daemon
+
+	ActiveCluster(ctx context.Context, domainID, wfID, rID string) (string, error)
+	FailoverVersion(ctx context.Context, domainID, wfID, rID string) (int64, error)
+}
+
+type DomainIDToDomainFn func(id string) (*cache.DomainCacheEntry, error)
+
+type manager struct {
+	domainIDToDomainFn DomainIDToDomainFn
+	clusterMetadata    cluster.Metadata
+	metricsCl          metrics.Client
+	logger             log.Logger
+}
+
+func NewManager(
+	domainIDToDomainFn DomainIDToDomainFn,
+	clusterMetadata cluster.Metadata,
+	metricsCl metrics.Client,
+	logger log.Logger,
+) Manager {
+	return &manager{
+		domainIDToDomainFn: domainIDToDomainFn,
+		clusterMetadata:    clusterMetadata,
+		metricsCl:          metricsCl,
+		logger:             logger.WithTags(tag.ComponentActiveRegionManager),
+	}
+}
+
+func (m *manager) ActiveCluster(ctx context.Context, domainID, wfID, rID string) (string, error) {
+	d, err := m.domainIDToDomainFn(domainID)
+	if err != nil {
+		return "", err
+	}
+
+	if !d.GetReplicationConfig().IsActiveActive() {
+		// Not an active-active domain. return ActiveClusterName from domain entry
+		return d.GetReplicationConfig().ActiveClusterName, nil
+	}
+
+	// TODO: Remove below fake implementation and implement properly
+	// - lookup active region given <domain id, wf id, run id> from executions table RowType=ActiveCluster.
+	// - cache this info
+	// - add metrics for cache hit/miss
+	// - return cluster name
+	if wfID == "wf1" {
+		return "cluster0", nil
+	}
+	if wfID == "wf2" {
+		return "cluster1", nil
+	}
+
+	return d.GetReplicationConfig().ActiveClusterName, nil
+}
+
+func (m *manager) FailoverVersion(ctx context.Context, domainID, wfID, rID string) (int64, error) {
+	// TODO: implement this
+	return 0, nil
+}
+
+func (m *manager) Start() {
+}
+
+func (m *manager) Stop() {
+}