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// Copyright 2017 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package spanner
import (
"context"
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
)
const statsPrefix = "cloud.google.com/go/spanner/"
var (
tagClientID = tag.MustNewKey("client_id")
tagDatabase = tag.MustNewKey("database")
tagInstance = tag.MustNewKey("instance_id")
tagLibVersion = tag.MustNewKey("library_version")
tagAllKeys = []tag.Key{tagClientID, tagDatabase, tagInstance, tagLibVersion}
)
func recordStat(ctx context.Context, m *stats.Int64Measure, n int64) {
stats.Record(ctx, m.M(n))
}
var (
// OpenSessionCount is a measure of the number of sessions currently opened.
// It is EXPERIMENTAL and subject to change or removal without notice.
OpenSessionCount = stats.Int64(
statsPrefix+"open_session_count",
"Number of sessions currently opened",
stats.UnitDimensionless,
)
// OpenSessionCountView is a view of the last value of OpenSessionCount.
// It is EXPERIMENTAL and subject to change or removal without notice.
OpenSessionCountView = &view.View{
Measure: OpenSessionCount,
Aggregation: view.LastValue(),
TagKeys: tagAllKeys,
}
// MaxAllowedSessionsCount is a measure of the maximum number of sessions
// allowed. Configurable by the user.
MaxAllowedSessionsCount = stats.Int64(
statsPrefix+"max_allowed_sessions",
"The maximum number of sessions allowed. Configurable by the user.",
stats.UnitDimensionless,
)
// MaxAllowedSessionsCountView is a view of the last value of
// MaxAllowedSessionsCount.
MaxAllowedSessionsCountView = &view.View{
Measure: MaxAllowedSessionsCount,
Aggregation: view.LastValue(),
TagKeys: tagAllKeys,
}
// InUseSessionsCount is a measure of the number of sessions currently
// opened.
InUseSessionsCount = stats.Int64(
statsPrefix+"in_use_sessions",
"The number of sessions currently in use.",
stats.UnitDimensionless,
)
// InUseSessionsCountView is a view of the last value of
// InUseSessionsCount.
InUseSessionsCountView = &view.View{
Measure: InUseSessionsCount,
Aggregation: view.LastValue(),
TagKeys: tagAllKeys,
}
// MaxInUseSessionsCount is a measure of the maximum number of sessions
// in use during the last 10 minute interval.
MaxInUseSessionsCount = stats.Int64(
statsPrefix+"max_in_use_sessions",
"The maximum number of sessions in use during the last 10 minute interval.",
stats.UnitDimensionless,
)
// MaxInUseSessionsCountView is a view of the last value of
// MaxInUseSessionsCount.
MaxInUseSessionsCountView = &view.View{
Measure: MaxInUseSessionsCount,
Aggregation: view.LastValue(),
TagKeys: tagAllKeys,
}
// GetSessionTimeoutsCount is a measure of the number of get sessions
// timeouts due to pool exhaustion.
GetSessionTimeoutsCount = stats.Int64(
statsPrefix+"get_session_timeouts",
"The number of get sessions timeouts due to pool exhaustion.",
stats.UnitDimensionless,
)
// GetSessionTimeoutsCountView is a view of the last value of
// GetSessionTimeoutsCount.
GetSessionTimeoutsCountView = &view.View{
Measure: GetSessionTimeoutsCount,
Aggregation: view.Count(),
TagKeys: tagAllKeys,
}
// AcquiredSessionsCount is the number of sessions acquired from
// the session pool.
AcquiredSessionsCount = stats.Int64(
statsPrefix+"num_acquired_sessions",
"The number of sessions acquired from the session pool.",
stats.UnitDimensionless,
)
// AcquiredSessionsCountView is a view of the last value of
// AcquiredSessionsCount.
AcquiredSessionsCountView = &view.View{
Measure: AcquiredSessionsCount,
Aggregation: view.Count(),
TagKeys: tagAllKeys,
}
// ReleasedSessionsCount is the number of sessions released by the user
// and pool maintainer.
ReleasedSessionsCount = stats.Int64(
statsPrefix+"num_released_sessions",
"The number of sessions released by the user and pool maintainer.",
stats.UnitDimensionless,
)
// ReleasedSessionsCountView is a view of the last value of
// ReleasedSessionsCount.
ReleasedSessionsCountView = &view.View{
Measure: ReleasedSessionsCount,
Aggregation: view.Count(),
TagKeys: tagAllKeys,
}
)
// EnableStatViews enables all views of metrics relate to session management.
func EnableStatViews() error {
return view.Register(
OpenSessionCountView,
MaxAllowedSessionsCountView,
InUseSessionsCountView,
MaxInUseSessionsCountView,
GetSessionTimeoutsCountView,
AcquiredSessionsCountView,
ReleasedSessionsCountView,
)
}
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