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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//go:build !nootel
package observability
import (
"context"
"errors"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/gin-gonic/gin"
"github.com/technologize/otel-go-contrib/otelginmetrics"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/metric"
sdk "go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/metric/exemplar"
"go.opentelemetry.io/otel/sdk/resource"
semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
)
const (
serviceName = "GoToSocial"
)
func InitializeMetrics(db db.DB) error {
if !config.GetMetricsEnabled() {
return nil
}
if config.GetMetricsAuthEnabled() {
if config.GetMetricsAuthPassword() == "" || config.GetMetricsAuthUsername() == "" {
return errors.New("metrics-auth-username and metrics-auth-password must be set when metrics-auth-enabled is true")
}
}
r, _ := resource.Merge(
resource.Default(),
resource.NewSchemaless(
semconv.ServiceName(serviceName),
semconv.ServiceVersion(config.GetSoftwareVersion()),
),
)
prometheusExporter, err := prometheus.New()
if err != nil {
return err
}
meterProvider := sdk.NewMeterProvider(
sdk.WithExemplarFilter(exemplar.AlwaysOffFilter),
sdk.WithResource(r),
sdk.WithReader(prometheusExporter),
)
otel.SetMeterProvider(meterProvider)
meter := meterProvider.Meter(serviceName)
thisInstance := config.GetHost()
_, err = meter.Int64ObservableGauge(
"gotosocial.instance.total_users",
metric.WithDescription("Total number of users on this instance"),
metric.WithInt64Callback(func(c context.Context, o metric.Int64Observer) error {
userCount, err := db.CountInstanceUsers(c, thisInstance)
if err != nil {
return err
}
o.Observe(int64(userCount))
return nil
}),
)
if err != nil {
return err
}
_, err = meter.Int64ObservableGauge(
"gotosocial.instance.total_statuses",
metric.WithDescription("Total number of statuses on this instance"),
metric.WithInt64Callback(func(c context.Context, o metric.Int64Observer) error {
statusCount, err := db.CountInstanceStatuses(c, thisInstance)
if err != nil {
return err
}
o.Observe(int64(statusCount))
return nil
}),
)
if err != nil {
return err
}
_, err = meter.Int64ObservableGauge(
"gotosocial.instance.total_federating_instances",
metric.WithDescription("Total number of other instances this instance is federating with"),
metric.WithInt64Callback(func(c context.Context, o metric.Int64Observer) error {
federatingCount, err := db.CountInstanceDomains(c, thisInstance)
if err != nil {
return err
}
o.Observe(int64(federatingCount))
return nil
}),
)
if err != nil {
return err
}
return nil
}
func MetricsMiddleware() gin.HandlerFunc {
return otelginmetrics.Middleware(serviceName)
}
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