Add configuration support to tracing instrumentation (#160)

* Add support for supplying instrumentation configuration via tracing option. Option argument added to instrumentation interface.
* Add ignoreIncomingPaths and ignoreOutgoingUrls support to the http and https tracing instrumentations.

Author: whs

CHANGELOG.md

@@ -6,6 +6,8 @@ All notable changes to this project will be documented in this file.
 - Add Metrics API.
 - Add Resource API.
 - Add Gauges (`DoubleGauge`, `LongGauge`, `DerivedDoubleGauge`, `DerivedLongGauge`) APIs.
+- Add support for supplying instrumentation configuration via tracing option. Option argument added to instrumentation interface.
+- Add ignoreIncomingPaths and ignoreOutgoingUrls support to the http and https tracing instrumentations.
 
 ## 0.0.8 - 2018-12-14
  **Contains API breaking changes for stats/metrics implementations**

package-lock.json

@@ -33,8 +33,6 @@ export interface BufferConfig {
 export interface TracerConfig {
   /** Determines the sampling rate. Ranges from 0.0 to 1.0 */
   samplingRate?: number;
-  /** Determines the ignored (or blacklisted) URLs */
-  ignoreUrls?: Array<string|RegExp>;
   /** A logger object  */
   logger?: Logger;
   /** A propagation instance */

packages/opencensus-core/package-lock.json

@@ -47,6 +47,8 @@ export abstract class BasePlugin implements types.Plugin {
   protected internalFilesExports: ModuleExportsMapping;
   /** module directory - used to load internal files */
   protected basedir: string;
+  /** plugin options */
+  protected options: types.PluginConfig;
 
   /**
    * Constructs a new BasePlugin instance.
@@ -61,17 +63,19 @@ export abstract class BasePlugin implements types.Plugin {
    * @param moduleExports nodejs module exports to set as context
    * @param tracer tracer relating to context
    * @param version module version description
+   * @param options plugin options
    * @param basedir module absolute path
    */
   private setPluginContext(
       // tslint:disable-next-line:no-any
       moduleExports: any, tracer: modelTypes.Tracer, version: string,
-      basedir?: string) {
+      options: types.PluginConfig, basedir?: string) {
     this.moduleExports = moduleExports;
     this.tracer = tracer;
     this.version = version;
     this.basedir = basedir;
     this.logger = tracer.logger;
+    this.options = options;
     this.internalFilesExports = this.loadInternalFiles();
   }
 
@@ -85,13 +89,14 @@ export abstract class BasePlugin implements types.Plugin {
    * @param moduleExports nodejs module exports from the module to patch
    * @param tracer a tracer instance
    * @param version version of the current instaled module to patch
+   * @param options plugin options
    * @param basedir module absolute path
    */
   enable<T>(
       // tslint:disable-next-line:no-any
       moduleExports: T, tracer: modelTypes.Tracer, version: string,
-      basedir: string) {
-    this.setPluginContext(moduleExports, tracer, version, basedir);
+      options: types.PluginConfig, basedir: string) {
+    this.setPluginContext(moduleExports, tracer, version, options, basedir);
     return this.applyPatch();
   }
 
@@ -146,7 +151,7 @@ export abstract class BasePlugin implements types.Plugin {
    * Load internal files from a module and  set internalFilesExports
    */
   private loadInternalModuleFiles(
-      extraModulesList: types.PluginNames,
+      extraModulesList: types.PluginInternalFilesVersion,
       basedir: string): ModuleExportsMapping {
     const extraModules: ModuleExportsMapping = {};
     if (extraModulesList) {

packages/opencensus-core/src/trace/config/types.ts

@@ -24,31 +24,45 @@ export interface Plugin {
    * @param moduleExports nodejs module exports from the module to patch
    * @param tracer a tracer instance
    * @param version version of the current instaled module to patch
+   * @param options plugin options
    * @param basedir module absolute path
    */
   enable(
       // tslint:disable-next-line:no-any
       moduleExports: any, tracer: Tracer, version: string,
+      options: PluginConfig,
       // tslint:disable-next-line:no-any
       basedir?: string): any;
   /** Method to disable the instrumentation  */
   disable(): void;
 }
 
+export type PluginConfig = {
+  // tslint:disable-next-line:no-any
+  [key: string]: any;
+};
+
+export type NamedPluginConfig = {
+  module: string; config: PluginConfig;
+};
 
 /**
  * Type PluginNames: each key should be the name of the module to trace,
  * and its value should be the name of the package  which has the
  * plugin implementation.
  */
 export type PluginNames = {
-  [pluginName: string]: string;
+  [pluginName: string]: string|NamedPluginConfig;
+};
+
+export type PluginInternalFilesVersion = {
+  [pluginName: string]: string
 };
 
 /**
  * Each key should be the name of the module to trace, and its value
  * a mapping of a property name to a internal plugin file name.
  */
 export type PluginInternalFiles = {
-  [versions: string]: PluginNames;
+  [versions: string]: PluginInternalFilesVersion;
 };

packages/opencensus-core/src/trace/instrumentation/base-plugin.ts

@@ -123,9 +123,11 @@ export class CoreTracer implements types.Tracer {
           }
         }
         const aRoot = new RootSpan(this, options);
-        const sampleDecision: boolean = propagatedSample ?
-            propagatedSample :
-            this.sampler.shouldSample(aRoot.traceId);
+
+        let sampleDecision: boolean = propagatedSample;
+        if (!sampleDecision) {
+          sampleDecision = this.sampler.shouldSample(aRoot.traceId);
+        }
 
         if (sampleDecision) {
           this.currentRootSpan = aRoot;