const (
	srStatePrefix = minioConfigPrefix + "/site-replication"
	srStateFile   = "state.json"
)

const (
	srStateFormatVersion1 = 1
)

var (
	errSRCannotJoin = SRError{
		Cause: errors.New("this site is already configured for site-replication"),
		Code:  ErrSiteReplicationInvalidRequest,
	}
	errSRDuplicateSites = SRError{
		Cause: errors.New("duplicate sites provided for site-replication"),

	// Queued operations
	Queued InQueueMetric `json:"queued"`
	// Proxy stats
	Proxied ProxyMetric `json:"proxied"`
	// replication metrics summary for each site replication peer
	Metrics map[string]SRMetric `json:"replMetrics"`
	// uptime of node being queried for site replication metrics
	Uptime int64 `json:"uptime"`

		// Cluster Replication APIs
		adminRouter.Methods(http.MethodPut).Path(adminVersion + "/site-replication/add").HandlerFunc(adminMiddleware(adminAPI.SiteReplicationAdd))
		adminRouter.Methods(http.MethodPut).Path(adminVersion + "/site-replication/remove").HandlerFunc(adminMiddleware(adminAPI.SiteReplicationRemove))
		adminRouter.Methods(http.MethodGet).Path(adminVersion + "/site-replication/info").HandlerFunc(adminMiddleware(adminAPI.SiteReplicationInfo))

	success := make([]int, len(li.paths))
	for i, path := range li.paths {
		if !li.ns.lock(ctx, li.volume, path, lockSource, li.opsID, readLock, timeout.Timeout()) {
			timeout.LogFailure()
			for si, sint := range success {
				if sint == 1 {
					li.ns.unlock(li.volume, li.paths[si], readLock)
				}
			}
			if errors.Is(ctx.Err(), context.Canceled) {
				return LockContext{}, ctx.Err()
			}

		if s.hasReplicationUsage() {
			return true
		}
	}
	return false
}

// ReplicationStats holds the global in-memory replication stats
type ReplicationStats struct {
	// map of site deployment ID to site replication status
	// for site replication - maintain stats at global level
	srStats *SRStats
	// active worker stats
	workers *ActiveWorkerStat
	// queue stats cache
	qCache queueCache

	pCache proxyStatsCache

	EnvPublicIPs  = "MINIO_PUBLIC_IPS"
	EnvFSOSync    = "MINIO_FS_OSYNC"
	EnvArgs       = "MINIO_ARGS"
	EnvVolumes    = "MINIO_VOLUMES"
	EnvDNSWebhook = "MINIO_DNS_WEBHOOK_ENDPOINT"

	EnvSiteName   = "MINIO_SITE_NAME"
	EnvSiteRegion = "MINIO_SITE_REGION"

	EnvMinIOSubnetLicense = "MINIO_SUBNET_LICENSE" // Deprecated Dec 2021
	EnvMinIOSubnetAPIKey  = "MINIO_SUBNET_API_KEY"
	EnvMinIOSubnetProxy   = "MINIO_SUBNET_PROXY"

		return
	}

	if globalSiteReplicationSys.isEnabled() && !v.Enabled() {
		writeErrorResponse(ctx, w, APIError{
			Code:           "InvalidBucketState",
			Description:    "Cluster replication is enabled on this site, versioning cannot be suspended on bucket.",
			HTTPStatusCode: http.StatusBadRequest,
		}, r.URL)
		return
	}

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// Region help is documented in default config
var (
	SiteHelp = HelpKVS{
		HelpKV{
			Key:         NameKey,
			Type:        "string",
			Description: `name for the site e.g. "cal-rack0"`,
			Optional:    true,
		},
		HelpKV{
			Key:         RegionKey,
			Type:        "string",
			Description: `name of the location of the server e.g. "us-west-1"`,
			Optional:    true,
		},

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