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provider.go
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provider.go
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// Copyright Splunk, Inc.
//
// 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 discovery
import (
"context"
"fmt"
"os"
"strings"
"go.opentelemetry.io/collector/confmap"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"github.com/signalfx/splunk-otel-collector/internal/confmapprovider/discovery/bundle"
"github.com/signalfx/splunk-otel-collector/internal/confmapprovider/discovery/properties"
"github.com/signalfx/splunk-otel-collector/internal/settings"
)
var _ confmap.Provider = (*providerShim)(nil)
type Provider interface {
ConfigDScheme() string
ConfigDProvider() confmap.Provider
DiscoveryModeScheme() string
DiscoveryModeProvider() confmap.Provider
PropertyScheme() string
PropertyProvider() confmap.Provider
}
type providerShim struct {
retrieve func(ctx context.Context, uri string, watcher confmap.WatcherFunc) (*confmap.Retrieved, error)
scheme string
}
func (p providerShim) Retrieve(ctx context.Context, uri string, watcher confmap.WatcherFunc) (*confmap.Retrieved, error) {
return p.retrieve(ctx, uri, watcher)
}
func (p providerShim) Scheme() string {
return p.scheme
}
func (p providerShim) Shutdown(context.Context) error {
return nil
}
type mapProvider struct {
logger *zap.Logger
configs map[string]*Config
discoverer *discoverer
}
func New() (Provider, error) {
m := &mapProvider{configs: map[string]*Config{}}
zapConfig := zap.NewProductionConfig()
logLevel := zap.WarnLevel
if ll, ok := os.LookupEnv(logLevelEnvVar); ok {
if l, err := zapcore.ParseLevel(ll); err == nil {
logLevel = l
}
}
zapConfig.Level = zap.NewAtomicLevelAt(logLevel)
var err error
if m.logger, err = zapConfig.Build(); err != nil {
return (*mapProvider)(nil), err
}
if m.discoverer, err = newDiscoverer(m.logger); err != nil {
return (*mapProvider)(nil), err
}
return m, nil
}
func (m *mapProvider) ConfigDProvider() confmap.Provider {
return providerShim{
scheme: m.ConfigDScheme(),
retrieve: m.retrieve(m.ConfigDScheme()),
}
}
func (m *mapProvider) DiscoveryModeProvider() confmap.Provider {
return providerShim{
scheme: m.DiscoveryModeScheme(),
retrieve: m.retrieve(m.DiscoveryModeScheme()),
}
}
func (m *mapProvider) PropertyProvider() confmap.Provider {
return providerShim{
scheme: m.PropertyScheme(),
retrieve: m.retrieve(m.PropertyScheme()),
}
}
func (m *mapProvider) retrieve(scheme string) func(context.Context, string, confmap.WatcherFunc) (*confmap.Retrieved, error) {
return func(ctx context.Context, uri string, _ confmap.WatcherFunc) (*confmap.Retrieved, error) {
schemePrefix := fmt.Sprintf("%s:", scheme)
if !strings.HasPrefix(uri, schemePrefix) {
return nil, fmt.Errorf("uri %q is not supported by %s provider", uri, scheme)
}
uriVal := uri[len(schemePrefix):]
if schemePrefix == fmt.Sprintf("%s:", settings.PropertyScheme) {
return m.parsedProperty(uriVal)
}
var cfg *Config
var ok bool
if uriVal != "" {
if cfg, ok = m.configs[uriVal]; !ok {
cfg = NewConfig(m.logger)
m.logger.Debug("loading config.d", zap.String("config-dir", uriVal))
if err := cfg.Load(uriVal); err != nil {
m.logger.Error("failed loading config.d", zap.String("config-dir", uriVal), zap.Error(err))
return nil, err
}
m.logger.Debug("successfully loaded config.d", zap.String("config-dir", uriVal))
m.configs[uriVal] = cfg
}
} else {
// empty config to be noop for config.d or base for bundle.d
cfg = NewConfig(m.logger)
}
if strings.HasPrefix(uri, settings.ConfigDScheme) {
return confmap.NewRetrieved(cfg.toServiceConfig())
}
if strings.HasPrefix(uri, settings.DiscoveryModeScheme) {
var bundledCfg *Config
if bundledCfg, ok = m.configs["<bundled>"]; !ok {
m.logger.Debug("loading bundle.d")
bundledCfg = NewConfig(m.logger)
if err := bundledCfg.LoadFS(bundle.BundledFS); err != nil {
m.logger.Error("failed loading bundle.d", zap.Error(err))
return nil, err
}
m.logger.Debug("successfully loaded bundle.d")
m.configs["<bundled>"] = bundledCfg
}
if err := mergeConfigWithBundle(cfg, bundledCfg); err != nil {
return nil, fmt.Errorf("failed merging user and bundled discovery configs: %w", err)
}
discoveryCfg, err := m.discoverer.discover(cfg)
if err != nil {
return nil, fmt.Errorf("failed to successfully discover target services: %w", err)
}
return confmap.NewRetrieved(discoveryCfg)
}
return nil, fmt.Errorf("unsupported %s scheme %q", scheme, uri)
}
}
func (m *mapProvider) ConfigDScheme() string {
return settings.ConfigDScheme
}
func (m *mapProvider) DiscoveryModeScheme() string {
return settings.DiscoveryModeScheme
}
func (m *mapProvider) PropertyScheme() string {
return settings.PropertyScheme
}
func (m *mapProvider) parsedProperty(rawProperty string) (*confmap.Retrieved, error) {
// split property from value
equalsIdx := strings.Index(rawProperty, "=")
if equalsIdx == -1 || len(rawProperty) <= equalsIdx+1 {
return nil, fmt.Errorf("invalid discovery property %q not of form <property>=<value>", rawProperty)
}
prop, err := properties.NewProperty(rawProperty[:equalsIdx], rawProperty[equalsIdx+1:])
if err != nil {
return nil, fmt.Errorf("invalid discovery property: %w", err)
}
m.discoverer.propertiesConf.Merge(confmap.NewFromStringMap(prop.ToStringMap()))
// return nil confmap to satisfy signature
return confmap.NewRetrieved(nil)
}