/
extensions.go
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/
extensions.go
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// Copyright The OpenTelemetry Authors
//
// 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 extensions // import "go.opentelemetry.io/collector/service/extensions"
import (
"context"
"fmt"
"net/http"
"sort"
"go.uber.org/multierr"
"go.uber.org/zap"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/extension"
"go.opentelemetry.io/collector/service/internal/components"
"go.opentelemetry.io/collector/service/internal/zpages"
)
const zExtensionName = "zextensionname"
// Extensions is a map of extensions created from extension configs.
type Extensions struct {
telemetry component.TelemetrySettings
extMap map[component.ID]extension.Extension
}
// Start starts all extensions.
func (bes *Extensions) Start(ctx context.Context, host component.Host) error {
bes.telemetry.Logger.Info("Starting extensions...")
for extID, ext := range bes.extMap {
extLogger := extensionLogger(bes.telemetry.Logger, extID)
extLogger.Info("Extension is starting...")
if err := ext.Start(ctx, components.NewHostWrapper(host, extLogger)); err != nil {
return err
}
extLogger.Info("Extension started.")
}
return nil
}
// Shutdown stops all extensions.
func (bes *Extensions) Shutdown(ctx context.Context) error {
bes.telemetry.Logger.Info("Stopping extensions...")
var errs error
for _, ext := range bes.extMap {
errs = multierr.Append(errs, ext.Shutdown(ctx))
}
return errs
}
func (bes *Extensions) NotifyPipelineReady() error {
for extID, ext := range bes.extMap {
if pw, ok := ext.(extension.PipelineWatcher); ok {
if err := pw.Ready(); err != nil {
return fmt.Errorf("failed to notify extension %q: %w", extID, err)
}
}
}
return nil
}
func (bes *Extensions) NotifyPipelineNotReady() error {
// Notify extensions in reverse order.
var errs error
for _, ext := range bes.extMap {
if pw, ok := ext.(extension.PipelineWatcher); ok {
errs = multierr.Append(errs, pw.NotReady())
}
}
return errs
}
func (bes *Extensions) GetExtensions() map[component.ID]component.Component {
result := make(map[component.ID]component.Component, len(bes.extMap))
for extID, v := range bes.extMap {
result[extID] = v
}
return result
}
func (bes *Extensions) HandleZPages(w http.ResponseWriter, r *http.Request) {
extensionName := r.URL.Query().Get(zExtensionName)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
zpages.WriteHTMLPageHeader(w, zpages.HeaderData{Title: "Extensions"})
data := zpages.SummaryExtensionsTableData{}
data.Rows = make([]zpages.SummaryExtensionsTableRowData, 0, len(bes.extMap))
for id := range bes.extMap {
row := zpages.SummaryExtensionsTableRowData{FullName: id.String()}
data.Rows = append(data.Rows, row)
}
sort.Slice(data.Rows, func(i, j int) bool {
return data.Rows[i].FullName < data.Rows[j].FullName
})
zpages.WriteHTMLExtensionsSummaryTable(w, data)
if extensionName != "" {
zpages.WriteHTMLComponentHeader(w, zpages.ComponentHeaderData{
Name: extensionName,
})
// TODO: Add config + status info.
}
zpages.WriteHTMLPageFooter(w)
}
// Settings holds configuration for building Extensions.
type Settings struct {
Telemetry component.TelemetrySettings
BuildInfo component.BuildInfo
// Drepecated: [v0.68.0] use Extensions.
Configs map[component.ID]component.Config
// Drepecated: [v0.68.0] use Extensions.
Factories map[component.Type]extension.Factory
// Extensions builder for extensions.
Extensions *extension.Builder
}
// New creates a new Extensions from Config.
func New(ctx context.Context, set Settings, cfg Config) (*Extensions, error) {
if set.Extensions == nil {
set.Extensions = extension.NewBuilder(set.Configs, set.Factories)
}
exts := &Extensions{
telemetry: set.Telemetry,
extMap: make(map[component.ID]extension.Extension),
}
for _, extID := range cfg {
extSet := extension.CreateSettings{
ID: extID,
TelemetrySettings: set.Telemetry,
BuildInfo: set.BuildInfo,
}
extSet.TelemetrySettings.Logger = extensionLogger(set.Telemetry.Logger, extID)
ext, err := set.Extensions.Create(ctx, extSet)
if err != nil {
return nil, fmt.Errorf("failed to create extension %q: %w", extID, err)
}
// Check if the factory really created the extension.
if ext == nil {
return nil, fmt.Errorf("factory for %q produced a nil extension", extID)
}
exts.extMap[extID] = ext
}
return exts, nil
}
func extensionLogger(logger *zap.Logger, id component.ID) *zap.Logger {
return logger.With(
zap.String(components.ZapKindKey, components.ZapKindExtension),
zap.String(components.ZapNameKey, id.String()))
}