forked from open-telemetry/opentelemetry-js-contrib
/
instrumentation.ts
123 lines (107 loc) · 3.35 KB
/
instrumentation.ts
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
/*
* 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
*
* https://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.
*/
import {
context,
diag,
trace,
isSpanContextValid,
Span,
} from '@opentelemetry/api';
import {
InstrumentationBase,
InstrumentationNodeModuleDefinition,
isWrapped,
safeExecuteInTheMiddle,
} from '@opentelemetry/instrumentation';
import { BunyanInstrumentationConfig } from './types';
import { VERSION } from './version';
import type * as BunyanLogger from 'bunyan';
export class BunyanInstrumentation extends InstrumentationBase<
typeof BunyanLogger
> {
constructor(config: BunyanInstrumentationConfig = {}) {
super('@opentelemetry/instrumentation-bunyan', VERSION, config);
}
protected init() {
return [
new InstrumentationNodeModuleDefinition<typeof BunyanLogger>(
'bunyan',
['<2.0'],
logger => {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const proto = logger.prototype as any;
if (isWrapped(proto['_emit'])) {
this._unwrap(proto, '_emit');
}
this._wrap(
proto,
'_emit',
// eslint-disable-next-line @typescript-eslint/no-explicit-any
this._getPatchedEmit() as any
);
return logger;
},
logger => {
if (logger === undefined) return;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
this._unwrap(logger.prototype as any, '_emit');
}
),
];
}
override getConfig(): BunyanInstrumentationConfig {
return this._config;
}
override setConfig(config: BunyanInstrumentationConfig) {
this._config = config;
}
private _getPatchedEmit() {
return (original: (...args: unknown[]) => void) => {
const instrumentation = this;
return function patchedEmit(this: BunyanLogger, ...args: unknown[]) {
const span = trace.getSpan(context.active());
if (!span) {
return original.apply(this, args);
}
const spanContext = span.spanContext();
if (!isSpanContextValid(spanContext)) {
return original.apply(this, args);
}
const record = args[0] as Record<string, string>;
record['trace_id'] = spanContext.traceId;
record['span_id'] = spanContext.spanId;
record['trace_flags'] = `0${spanContext.traceFlags.toString(16)}`;
instrumentation._callHook(span, record);
return original.apply(this, args);
};
};
}
private _callHook(span: Span, record: Record<string, string>) {
const hook = this.getConfig().logHook;
if (typeof hook !== 'function') {
return;
}
safeExecuteInTheMiddle(
() => hook(span, record),
err => {
if (err) {
diag.error('bunyan instrumentation: error calling logHook', err);
}
},
true
);
}
}