@opentelemetry/instrumentation-memcached
Version:
OpenTelemetry instrumentation for `memcached` database client for memcached
114 lines • 4.88 kB
JavaScript
;
/*
* 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.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.MemcachedInstrumentation = void 0;
const api = require("@opentelemetry/api");
const instrumentation_1 = require("@opentelemetry/instrumentation");
const semantic_conventions_1 = require("@opentelemetry/semantic-conventions");
const utils = require("./utils");
/** @knipignore */
const version_1 = require("./version");
class MemcachedInstrumentation extends instrumentation_1.InstrumentationBase {
static COMPONENT = 'memcached';
static COMMON_ATTRIBUTES = {
[semantic_conventions_1.SEMATTRS_DB_SYSTEM]: semantic_conventions_1.DBSYSTEMVALUES_MEMCACHED,
};
static DEFAULT_CONFIG = {
enhancedDatabaseReporting: false,
};
constructor(config = {}) {
super(version_1.PACKAGE_NAME, version_1.PACKAGE_VERSION, {
...MemcachedInstrumentation.DEFAULT_CONFIG,
...config,
});
}
setConfig(config = {}) {
super.setConfig({ ...MemcachedInstrumentation.DEFAULT_CONFIG, ...config });
}
init() {
return [
new instrumentation_1.InstrumentationNodeModuleDefinition('memcached', ['>=2.2.0 <3'], (moduleExports, moduleVersion) => {
this.ensureWrapped(moduleExports.prototype, 'command', this.wrapCommand.bind(this, moduleVersion));
return moduleExports;
}, (moduleExports) => {
if (moduleExports === undefined)
return;
// `command` is documented API missing from the types
this._unwrap(moduleExports.prototype, 'command');
}),
];
}
wrapCommand(moduleVersion, original) {
const instrumentation = this;
return function (queryCompiler, server) {
if (typeof queryCompiler !== 'function') {
return original.apply(this, arguments);
}
// The name will be overwritten later
const span = instrumentation.tracer.startSpan('unknown memcached command', {
kind: api.SpanKind.CLIENT,
attributes: {
'memcached.version': moduleVersion,
...MemcachedInstrumentation.COMMON_ATTRIBUTES,
},
});
const parentContext = api.context.active();
const context = api.trace.setSpan(parentContext, span);
return api.context.with(context, original, this, instrumentation.wrapQueryCompiler.call(instrumentation, queryCompiler, this, server, parentContext, span), server);
};
}
wrapQueryCompiler(original, client, server, callbackContext, span) {
const instrumentation = this;
return function () {
const query = original.apply(this, arguments);
const callback = query.callback;
span.updateName(`memcached ${query.type}`);
span.setAttributes({
'db.memcached.key': query.key,
'db.memcached.lifetime': query.lifetime,
[semantic_conventions_1.SEMATTRS_DB_OPERATION]: query.type,
[semantic_conventions_1.SEMATTRS_DB_STATEMENT]: instrumentation.getConfig()
.enhancedDatabaseReporting
? query.command
: undefined,
...utils.getPeerAttributes(client, server, query),
});
query.callback = api.context.bind(callbackContext, function (err) {
if (err) {
span.recordException(err);
span.setStatus({
code: api.SpanStatusCode.ERROR,
message: err.message,
});
}
span.end();
if (typeof callback === 'function') {
return callback.apply(this, arguments);
}
});
return query;
};
}
ensureWrapped(obj, methodName, wrapper) {
if ((0, instrumentation_1.isWrapped)(obj[methodName])) {
this._unwrap(obj, methodName);
}
this._wrap(obj, methodName, wrapper);
}
}
exports.MemcachedInstrumentation = MemcachedInstrumentation;
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