-
Notifications
You must be signed in to change notification settings - Fork 478
/
extension.go
155 lines (126 loc) · 4.4 KB
/
extension.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
// Package extension provides utilities to create a Flow component from
// OpenTelemetry Collector extensions.
//
// Other OpenTelemetry Collector extensions are better served as generic Flow
// components rather than being placed in the otelcol namespace.
package extension
import (
"context"
"os"
"github.com/grafana/agent/component"
"github.com/grafana/agent/component/otelcol/internal/lazycollector"
"github.com/grafana/agent/component/otelcol/internal/scheduler"
"github.com/grafana/agent/pkg/build"
"github.com/grafana/agent/pkg/util/zapadapter"
"github.com/prometheus/client_golang/prometheus"
otelcomponent "go.opentelemetry.io/collector/component"
otelextension "go.opentelemetry.io/collector/extension"
sdkprometheus "go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/sdk/metric"
)
// Arguments is an extension of component.Arguments which contains necessary
// settings for OpenTelemetry Collector extensions.
type Arguments interface {
component.Arguments
// Convert converts the Arguments into an OpenTelemetry Collector
// extension configuration.
Convert() (otelcomponent.Config, error)
// Extensions returns the set of extensions that the configured component is
// allowed to use.
Extensions() map[otelcomponent.ID]otelextension.Extension
// Exporters returns the set of exporters that are exposed to the configured
// component.
Exporters() map[otelcomponent.DataType]map[otelcomponent.ID]otelcomponent.Component
}
// Extension is a Flow component shim which manages an OpenTelemetry Collector
// extension.
type Extension struct {
ctx context.Context
cancel context.CancelFunc
opts component.Options
factory otelextension.Factory
sched *scheduler.Scheduler
collector *lazycollector.Collector
}
var (
_ component.Component = (*Extension)(nil)
_ component.HealthComponent = (*Extension)(nil)
)
// New creates a new Flow component which encapsulates an OpenTelemetry
// Collector extension. args must hold a value of the argument
// type registered with the Flow component.
func New(opts component.Options, f otelextension.Factory, args Arguments) (*Extension, error) {
ctx, cancel := context.WithCancel(context.Background())
// Create a lazy collector where metrics from the upstream component will be
// forwarded.
collector := lazycollector.New()
opts.Registerer.MustRegister(collector)
r := &Extension{
ctx: ctx,
cancel: cancel,
opts: opts,
factory: f,
sched: scheduler.New(opts.Logger),
collector: collector,
}
if err := r.Update(args); err != nil {
return nil, err
}
return r, nil
}
// Run starts the Extension component.
func (e *Extension) Run(ctx context.Context) error {
defer e.cancel()
return e.sched.Run(ctx)
}
// Update implements component.Component. It will convert the Arguments into
// configuration for OpenTelemetry Collector extension
// configuration and manage the underlying OpenTelemetry Collector extension.
func (e *Extension) Update(args component.Arguments) error {
rargs := args.(Arguments)
host := scheduler.NewHost(
e.opts.Logger,
scheduler.WithHostExtensions(rargs.Extensions()),
scheduler.WithHostExporters(rargs.Exporters()),
)
reg := prometheus.NewRegistry()
e.collector.Set(reg)
promExporter, err := sdkprometheus.New(sdkprometheus.WithRegisterer(reg), sdkprometheus.WithoutTargetInfo())
if err != nil {
return err
}
settings := otelextension.CreateSettings{
TelemetrySettings: otelcomponent.TelemetrySettings{
Logger: zapadapter.New(e.opts.Logger),
TracerProvider: e.opts.Tracer,
MeterProvider: metric.NewMeterProvider(metric.WithReader(promExporter)),
ReportComponentStatus: func(*otelcomponent.StatusEvent) error {
return nil
},
},
BuildInfo: otelcomponent.BuildInfo{
Command: os.Args[0],
Description: "Grafana Agent",
Version: build.Version,
},
}
extensionConfig, err := rargs.Convert()
if err != nil {
return err
}
// Create instances of the extension from our factory.
var components []otelcomponent.Component
ext, err := e.factory.CreateExtension(e.ctx, settings, extensionConfig)
if err != nil {
return err
} else if ext != nil {
components = append(components, ext)
}
// Schedule the components to run once our component is running.
e.sched.Schedule(host, components...)
return nil
}
// CurrentHealth implements component.HealthComponent.
func (e *Extension) CurrentHealth() component.Health {
return e.sched.CurrentHealth()
}