Lumberjack's extensible architecture and cross-version Angular compatibility

Lumberjack is a versatile and extensible logging library for Angular.

Its plugin-based architecture and cross-version compatibility with Angular and TypeScript enables features to be released across many versions of Angular and many log driver plugins from a single codebase.

We use the builder pattern to compose log objects and provide low level building blocks as well as conventional APIs for structuring Angular application logs.

Presented at:
- Angular Vienna #2, February 2021
- BeJS #11, February 2021 https://youtu.be/lcUTCTPMhEs

Transcript

1. Lumberjack's extensible
   architecture and cross-
   version Angular compatibility
   By Lars Gyrup Brink Nielsen
   

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2. Overview of Lumberjack
   

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3. Lumberjack features
   Lumberjack is a versatile and extensible logging library for Angular.
   • Configurable logging with 6 severity levels
   • Plugin-based architecture
   • Robust error handling
   • Built-in log drivers
   • Declarative logger base classes
   • An imperative Lumberjack service
   • Log builders
   • Schematics
   • Verified Cross-version Angular compatibility
   

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4. LumberjackService
   @Injectable({ providedIn: LumberjackRootModule })
   export class LumberjackService {
   log(lumberjackLog: LumberjackLog): void;
   }
   

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5. LumberjackService usage
   import { LumberjackService, LumberjackTimeService } from '@ngworker/lumberjack';
   @Injectable({ providedIn: 'root' })
   export class HeroService {
   constructor(
   private http: HttpClient,
   private lumberjack: LumberjackService, // 👈
   private time: LumberjackTimeService
   ) {}
   saveHero(hero: Hero): Observable {
   return this.http.post(`/hero/${hero.id}`, hero).pipe(
   tap({
   error: () => this.lumberjack.log({ // 👈
   createdAt: this.time.getUnixEpochTicks(),
   level: LumberjackLevel.Error,
   message: 'Failed to save hero',
   scope: 'Tour of Heroes App: Heroes feature',
   }),
   next: () => this.lumberjack.log({ // 👈
   createdAt: this.time.getUnixEpochTicks(),
   level: LumberjackLevel.Info,
   message: 'Successfully saved hero',
   scope: 'Tour of Heroes App: Heroes feature',
   }),
   }),
   mapTo(undefined)
   );
   }
   }
   

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6. LumberjackService usage
   import { LumberjackService, LumberjackTimeService } from '@ngworker/lumberjack';
   @Injectable({ providedIn: 'root' })
   export class HeroService {
   constructor(
   private http: HttpClient,
   private lumberjack: LumberjackService,
   private time: LumberjackTimeService // 👈
   ) {}
   saveHero(hero: Hero): Observable {
   return this.http.post(`/hero/${hero.id}`, hero).pipe(
   tap({
   error: () => this.lumberjack.log({
   createdAt: this.time.getUnixEpochTicks(), // 👈
   level: LumberjackLevel.Error,
   message: `Failed to save hero`,
   scope: 'Tour of Heroes App: Heroes feature',
   }),
   next: () => this.lumberjack.log({
   createdAt: this.time.getUnixEpochTicks(), // 👈
   level: LumberjackLevel.Info,
   message: 'Successfully saved hero',
   scope: 'Tour of Heroes App: Heroes feature',
   }),
   }),
   mapTo(undefined)
   );
   }
   }
   

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7. LumberjackLog
   interface LumberjackLog {
   /** Unix epoch ticks in milliseconds representing when the log was created. */
   readonly createdAt: number;
   /** Level of severity. */
   readonly level: LumberjackLogLevel;
   /** Log message, for example describing an event that happened. */
   readonly message: string;
   /** Optional payload with custom properties.
   * NOTE! Make sure that these properties are supported by your log drivers. */
   readonly payload?: TPayload;
   /** Scope, for example domain, application, component, or service. */
   readonly scope?: string;
   }
   

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8. LumberjackLogLevel
   type LumberjackLogLevel = Exclude;
   enum LumberjackLevel {
   Critical = 'critical',
   Debug = 'debug',
   Error = 'error',
   Info = 'info',
   Trace = 'trace',
   Verbose = 'verbose',
   Warning = 'warn',
   }
   

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9. Plugin-based architecture
   Lumberjack
   

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10. Control flow
    HTTP log driver
    Console log driver
    LumberjackService
    HeroService
    

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11. Flow of dependencies
    lumberjackLogDriver
    Token
    HTTP log driver
    Console log driver
    LumberjackService
    HeroService
    LumberjackLog
    Driver
    

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12. Control flow with 3rd party log driver
    HTTP log driver
    Console log driver
    LumberjackService
    HeroService
    Azure Application
    Insights log driver
    

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13. Flow of dependencies with 3rd party log
    driver
    lumberjackLogDriver
    Token
    HTTP log driver
    Console log driver
    LumberjackService
    HeroService
    LumberjackLog
    Driver
    Azure Application
    Insights log driver
    

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14. Lumberjack
    Application
    Log drivers
    Flow of dependencies
    Log drivers
    Log drivers
    

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15. Lumberjack registration and
    configuration
    import { LumberjackModule } from '@ngworker/lumberjack'; // 👈
    import { LumberjackConsoleDriverModule } from '@ngworker/lumberjack/console-driver';
    import { LumberjackHttpDriverModule } from '@ngworker/lumberjack/http-driver';
    @NgModule({
    bootstrap: [AppComponent],
    declarations: [AppComponent],
    imports: [
    BrowserModule,
    LumberjackModule.forRoot(), // 👈
    LumberjackConsoleDriverModule.forRoot(),
    LumberjackHttpDriverModule.withOptions({
    origin: 'Tour of Heroes App',
    retryOptions: { maxRetries: 5, delayMs: 250 },
    storeUrl: '/api/logs',
    }),
    ],
    })
    export class AppModule {}
    

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16. Lumberjack registration and
    configuration
    import { LumberjackModule } from '@ngworker/lumberjack';
    import { LumberjackConsoleDriverModule } from '@ngworker/lumberjack/console-driver';
    // 👆 👆
    import { LumberjackHttpDriverModule } from '@ngworker/lumberjack/http-driver';
    @NgModule({
    bootstrap: [AppComponent],
    declarations: [AppComponent],
    imports: [
    BrowserModule,
    LumberjackModule.forRoot(),
    LumberjackConsoleDriverModule.forRoot(), // 👈
    LumberjackHttpDriverModule.withOptions({
    origin: 'Tour of Heroes App',
    retryOptions: { maxRetries: 5, delayMs: 250 },
    storeUrl: '/api/logs',
    }),
    ],
    })
    export class AppModule {}
    

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17. Lumberjack registration and
    configuration
    import { LumberjackModule } from '@ngworker/lumberjack';
    import { LumberjackConsoleDriverModule } from '@ngworker/lumberjack/console-driver';
    import { LumberjackHttpDriverModule } from '@ngworker/lumberjack/http-driver';
    // 👆 👆
    @NgModule({
    bootstrap: [AppComponent],
    declarations: [AppComponent],
    imports: [
    BrowserModule,
    LumberjackModule.forRoot(),
    LumberjackConsoleDriverModule.forRoot(),
    LumberjackHttpDriverModule.withOptions({ // 👈
    origin: 'Tour of Heroes App',
    retryOptions: { maxRetries: 5, delayMs: 250 },
    storeUrl: '/api/logs',
    }),
    ],
    })
    export class AppModule {}
    

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18. Lumberjack log drivers
    • Built-in: Console log driver and HTTP log driver
    • Third party log drivers are community-driven
    • Custom log drivers are specific to your organization or project
    

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19. LumberjackLogDriver
    interface LumberjackLogDriver {
    readonly config: LumberjackLogDriverConfig;
    logCritical(driverLog: LumberjackLogDriverLog): void;
    logDebug(driverLog: LumberjackLogDriverLog): void;
    logError(driverLog: LumberjackLogDriverLog): void;
    logInfo(driverLog: LumberjackLogDriverLog): void;
    logTrace(driverLog: LumberjackLogDriverLog): void;
    logWarning(driverLog: LumberjackLogDriverLog): void;
    }
    

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20. LumberjackLogDriverLog
    interface LumberjackLogDriverLog {
    /** The text representation of the log. */
    readonly formattedLog: string;
    /** The log. Optionally supports a log payload. */
    readonly log: LumberjackLog;
    }
    

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21. Formatted log example
    critical 2021-02-20T22:30:21.338Z [Forest App] The forest is on fire!
    

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22. Log levels
    • Default log levels
    • Development: All log levels are enabled
    • Production: All log levels except Debug and Trace are enabled
    • Default log levels can be overridden using LumberjackModule.forRoot
    • Log levels are configurable on a per-log driver basis
    

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23. Log level configuration
    import { LumberjackLevel, LumberjackModule } from '@ngworker/lumberjack';
    import { LumberjackConsoleDriverModule } from '@ngworker/lumberjack/console-driver';
    import { LumberjackHttpDriverModule } from '@ngworker/lumberjack/http-driver';
    @NgModule({
    bootstrap: [AppComponent],
    declarations: [AppComponent],
    imports: [
    BrowserModule,
    LumberjackModule.forRoot(),
    LumberjackConsoleDriverModule.forRoot({
    levels: [LumberjackLevel.Verbose], // 👈
    }),
    LumberjackHttpDriverModule.forRoot({
    levels: [LumberjackLevel.Critical, LumberjackLevel.Error],
    origin: 'Tour of Heroes App',
    retryOptions: { maxRetries: 5, delayMs: 250 },
    storeUrl: '/api/logs',
    }),
    ],
    })
    export class AppModule {}
    

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24. Log level configuration
    import { LumberjackLevel, LumberjackModule } from '@ngworker/lumberjack';
    import { LumberjackConsoleDriverModule } from '@ngworker/lumberjack/console-driver';
    import { LumberjackHttpDriverModule } from '@ngworker/lumberjack/http-driver';
    @NgModule({
    bootstrap: [AppComponent],
    declarations: [AppComponent],
    imports: [
    BrowserModule,
    LumberjackModule.forRoot(),
    LumberjackConsoleDriverModule.forRoot({
    levels: [LumberjackLevel.Verbose],
    }),
    LumberjackHttpDriverModule.forRoot({
    levels: [LumberjackLevel.Critical, LumberjackLevel.Error], // 👈
    origin: 'Tour of Heroes App',
    retryOptions: { maxRetries: 5, delayMs: 250 },
    storeUrl: '/api/logs',
    }),
    ],
    })
    export class AppModule {}
    

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25. Cross-version Angular and
    TypeScript compatibility
    GitHub Actions workflow
    

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26. The problem
    • 8 Angular versions
    • 6 TypeScript versions
    • 2 Node.js versions
    • 30 possible combinations of dependencies
    Angular CLI version Angular version Node.js version TypeScript version
    9.0.7 9.0.x 10.13.x/12.11.x or later minor version 3.6.x/3.7.x
    9.1.x 9.1.x 10.13.x/12.11.x or later minor version 3.6.x/3.7.x/3.8.x
    10.0.8 10.0.x 10.13.x/12.11.x or later minor version 3.9.x
    10.1.7 10.1.x 10.13.x/12.11.x or later minor version 3.9.x/4.0.x
    10.2.x 10.2.x 10.13.x/12.11.x or later minor version 3.9.x/4.0.x
    11.0.7 11.0.x 10.13.x/12.11.x or later minor version 4.0.x
    11.1.x 11.1.x 10.13.x/12.11.x or later minor version 4.0.x/4.1.x
    11.2.x 11.2.x 10.13.x/12.11.x or later minor version 4.0.x/4.1.x
    

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27. The solution
    • Angular CLI workspace
    • Single-codebase solution
    • 1 demo application
    • 1 end-to-end application test suite
    • 1 schematics target application
    • 1 schematics end-to-end test suite
    • A GitHub Actions job run per combination of dependencies
    • Node.js scripts
    

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28. 50 jobs per CI run
    • 49 GitHub Actions job runs
    • 10-30 job runs in parallel
    • ~6 minutes in total
    

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29. 50 jobs per CI run
    The build, lint, and sonar jobs
    • The build job: Production library build, latest versions
    • The lint job: Check formatting and linting rules, latest versions
    • The sonar job: Generate test coverage and lint reports, then
    upload them to SonarCloud
    

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30. 50 jobs per CI run
    The lib job
    • Node.js: 12.x
    • Angular versions:
    • 9.0.x, 9.1.x
    • 10.0.x, 10.1.x, 10.2.x
    • 11.0.x, 11.1.x, 11.2.x
    • TypeScript versions:
    • 3.7.x, 3.8.x, 3.9.x
    • 4.0.x, 4.1.x
    

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31. The lib job
    • 8 matrix legs:
    • Install Angular matrix leg version
    • Install associated TypeScript version
    • Run unit and integration tests for:
    • Development library projects
    • Publishable library projects
    • Schematics
    

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32. 50 jobs per CI run
    The app job
    • Node.js versions:
    • 10.x
    • 12.x
    • Angular versions:
    • 9.0.x, 9.1.x
    • 10.0.x, 10.1.x, 10.2.x
    • 11.0.x, 11.1.x, 11.2.x
    • TypeScript versions:
    • 3.7.x, 3.8.x, 3.9.x
    • 4.0.x, 4.1.x
    

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33. The app job
    • 16 matrix legs:
    • Install Node.js matrix leg version
    • Install Angular matrix leg version
    • Install associated TypeScript version
    • Delete local TypeScript path mappings
    • Download build artifact from ”build” job
    • Move Lumberjack package into node_modules
    • Run Angular Compatibility Compiler (NGCC)
    • Run demo application unit and integration tests
    • Run demo application production build
    

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34. 50 jobs per CI run
    The e2e job
    • Node.js: 12.x
    • Angular versions:
    • 9.0.x, 9.1.x
    • 10.0.x, 10.1.x, 10.2.x
    • 11.0.x, 11.1.x, 11.2.x
    • TypeScript versions:
    • 3.7.x, 3.8.x, 3.9.x
    • 4.0.x, 4.1.x
    

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35. The e2e job
    • 8 matrix legs:
    • Install Angular matrix leg version
    • Install associated TypeScript version
    • Delete local TypeScript path mappings
    • Download build artifact from ”build” job
    • Move Lumberjack package into node_modules
    • Run Angular Compatibility Compiler (NGCC)
    • Install latest Google Chrome
    • Run end-to-end tests for demo application
    

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36. 50 jobs per CI run
    The schematics-e2e job
    • Node.js versions:
    • 10.x
    • 12.x
    • Angular versions:
    • 9.1.x
    • 10.0.x, 10.1.x, 10.2.x
    • 11.0.x, 11.1.x, 11.2.x
    • TypeScript versions:
    • 3.7.x, 3.8.x, 3.9.x
    • 4.0.x, 4.1.x
    

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37. The schematics-e2e job
    • 14 matrix legs:
    • Install Node.js matrix leg version
    • Install Angular matrix leg version
    • Install associated TypeScript version
    • Delete local TypeScript path mappings
    • Download build artifact from ”build” job
    • Move Lumberjack package into node_modules
    • Run Angular Compatibility Compiler (NGCC)
    • Run end-to-end tests for schematics
    

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38. The 50th job
    SonarCloud
    • Quality gate for new code
    • Quality gate for existing code
    • Quality profile
    • Additional SonarSource lint rules
    • Cyclomatic complexity analysis
    • Cognitive complexity analysis
    

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39. The 50th job
    SonarCloud
    • Reliability score
    • Security score
    • Maintainability score
    • Test coverage
    • Duplication detection
    

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40. How our GitHub workflow matrix is
    configured
    app:
    runs-on: ubuntu-latest
    needs: build
    strategy:
    matrix:
    node-version: [10.x, 12.x] # 👈
    angular-version: [9.0.x, 9.1.x, 10.0.x, 10.1.x, 10.2.x, 11.0.x, 11.1.x, 11.2.x]
    steps:
    - uses: actions/checkout@v2
    - name: Use Node.js ${{ matrix.node-version }}
    uses: actions/setup-node@v2
    with:
    node-version: ${{ matrix.node-version }} # 👈
    - name: Use Angular version ${{ matrix.angular-version }}
    uses: ngworker/angular-versions-action@v3
    with:
    angular-version: ${{ matrix.angular-version }}
    # Yarn caching left out for brevity
    - run: yarn install
    # Intermediary steps left out for brevity
    - run: yarn test:ci
    - run: yarn build
    

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41. How our GitHub workflow matrix is
    configured
    app:
    runs-on: ubuntu-latest
    needs: build
    strategy:
    matrix:
    node-version: [10.x, 12.x]
    angular-version: [9.0.x, 9.1.x, 10.0.x, 10.1.x, 10.2.x, 11.0.x, 11.1.x, 11.2.x]
    # 👆
    steps:
    - uses: actions/checkout@v2
    - name: Use Node.js ${{ matrix.node-version }}
    uses: actions/setup-node@v2
    with:
    node-version: ${{ matrix.node-version }}
    - name: Use Angular version ${{ matrix.angular-version }}
    uses: ngworker/angular-versions-action@v3
    with:
    angular-version: ${{ matrix.angular-version }} # 👈
    # Yarn caching left out for brevity
    - run: yarn install
    # Intermediary steps left out for brevity
    - run: yarn test:ci
    - run: yarn build
    

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42. How our GitHub workflow matrix is
    configured
    app:
    runs-on: ubuntu-latest
    needs: build
    strategy:
    matrix:
    node-version: [10.x, 12.x]
    angular-version: [9.0.x, 9.1.x, 10.0.x, 10.1.x, 10.2.x, 11.0.x, 11.1.x, 11.2.x]
    steps:
    - uses: actions/checkout@v2
    - name: Use Node.js ${{ matrix.node-version }}
    uses: actions/setup-node@v2
    with:
    node-version: ${{ matrix.node-version }}
    - name: Use Angular version ${{ matrix.angular-version }}
    uses: ngworker/angular-versions-action@v3 # 👈
    with:
    angular-version: ${{ matrix.angular-version }}
    # Yarn caching left out for brevity
    - run: yarn install
    # Intermediary steps left out for brevity
    - run: yarn test:ci
    - run: yarn build
    

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43. ngworker/angular-versions-action
    • Input parameter: angular-version
    • Example value: [11.0.x, 11.1.x, 11.2.x]
    • Replaces Angular and related dependencies such as TypeScript in package.json
    • Combinations of dependencies verified to still be in working state
    

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44. Log builders and conventions
    

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45. LumberjackService usage with log object
    literal
    import { LumberjackService, LumberjackTimeService } from '@ngworker/lumberjack';
    @Injectable({ providedIn: 'root' })
    export class HeroService {
    constructor(
    private http: HttpClient,
    private lumberjack: LumberjackService,
    private time: LumberjackTimeService // 👈
    ) {}
    saveHero(hero: Hero): Observable {
    return this.http.post(`/hero/${hero.id}`, hero).pipe(
    tap({
    error: () => this.lumberjack.log({
    createdAt: this.time.getUnixEpochTicks(), // 👈
    level: LumberjackLevel.Error,
    message: 'Failed to save hero',
    scope: 'Tour of Heroes App: Heroes feature',
    }),
    next: () => this.lumberjack.log({
    createdAt: this.time.getUnixEpochTicks(), // 👈
    level: LumberjackLevel.Info,
    message: 'Successfully saved hero',
    scope: 'Tour of Heroes App: Heroes feature',
    }),
    }),
    mapTo(undefined)
    );
    }
    }
    

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46. LumberjackService usage with
    LumberjackLogFactory
    import { LumberjackLogFactory, LumberjackService } from '@ngworker/lumberjack';
    @Injectable({ providedIn: 'root' })
    export class HeroService {
    constructor(
    private http: HttpClient,
    private lumberjack: LumberjackService,
    private logFactory: LumberjackLogFactory // 👈
    ) {}
    saveHero(hero: Hero): Observable {
    return this.http.post(`/hero/${hero.id}`, hero).pipe(
    tap({
    error: () => this.lumberjack.log(
    this.logFactory // 👈
    .createErrorLog('Failed to save hero')
    .withScope('Tour of Heroes App: Heroes feature')
    .build()),
    next: () => this.lumberjack.log(
    this.logFactory // 👈
    .createInfoLog('Successfully saved hero')
    .withScope('Tour of Heroes App: Heroes feature')
    .build()),
    }),
    mapTo(undefined)
    );
    }
    }
    

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47. HeroesLogger
    import { Injectable } from '@angular/core';
    import { ScopedLumberjackLogger } from '@ngworker/lumberjack'; // 👈
    @Injectable({ providedIn: 'root' })
    export class HeroesLogger extends ScopedLumberjackLogger { // 👈
    readonly scope = 'Tour of Heroes App: Heroes feature';
    heroSaved = this.createInfoLogger('Successfully saved hero').build();
    heroSaveFailed = this.createErrorLogger('Failed to save hero').build();
    }
    

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48. HeroesLogger
    import { Injectable } from '@angular/core';
    import { ScopedLumberjackLogger } from '@ngworker/lumberjack';
    @Injectable({ providedIn: 'root' })
    export class HeroesLogger extends ScopedLumberjackLogger {
    readonly scope = 'Tour of Heroes App: Heroes feature'; // 👈
    heroSaved = this.createInfoLogger('Successfully saved hero').build();
    heroSaveFailed = this.createErrorLogger('Failed to save hero').build();
    }
    

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49. HeroesLogger
    import { Injectable } from '@angular/core';
    import { ScopedLumberjackLogger } from '@ngworker/lumberjack';
    @Injectable({ providedIn: 'root' })
    export class HeroesLogger extends ScopedLumberjackLogger {
    readonly scope = 'Tour of Heroes App: Heroes feature';
    heroSaved = this.createInfoLogger('Successfully saved hero').build(); // 👈
    heroSaveFailed = this.createErrorLogger('Failed to save hero').build(); // 👈
    }
    

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50. HeroesLogger usage
    import { HeroesLogger } from './heroes-logger.service'; // 👈
    @Injectable({ providedIn: 'root' })
    class HeroService {
    constructor(private http: HttpClient, private logger: HeroesLogger/*👈*/) {}
    saveHero(hero: Hero): Observable {
    return this.http.post(`/hero/${hero.id}`, hero).pipe(
    tap({
    error: () => this.logger.heroSaveFailed(),
    next: () => this.logger.heroSaved(),
    }),
    mapTo(undefined)
    );
    }
    }
    

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51. HeroesLogger usage
    import { HeroesLogger } from './heroes-logger.service';
    @Injectable({ providedIn: 'root' })
    class HeroService {
    constructor(private http: HttpClient, private logger: HeroesLogger) {}
    saveHero(hero: Hero): Observable {
    return this.http.post(`/hero/${hero.id}`, hero).pipe(
    tap({
    error: () => this.logger.heroSaveFailed(), // 👈
    next: () => this.logger.heroSaved(), // 👈
    }),
    mapTo(undefined)
    );
    }
    }
    

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52. Conclusion
    

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53. Plugin-based architecture
    • Application code is independent of logging configuration
    • Application code is independent of logging providers
    • Bundled with console log driver
    • Bundled with HTTP log driver
    • Support for 3rd party log drivers
    • Support for custom log drivers
    • Built-in error handling
    • Fast log processing
    Lumberjack
    Application
    Log drivers
    Log drivers
    Log drivers
    

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54. Cross-version compatibility
    • Simple single-codebase solution
    • Purpose-built GitHub Action for Angular dependency
    management in CI workflows
    • Fast, parallellized GitHub Actions workflow
    • Each combination of dependencies is run in isolation for:
    • Unit and integration tests
    • End-to-end tests
    • Schematics end-to-end tests
    

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55. Cross-version compatibility
    • We release features and patches across 8 Angular versions, 6 TypeScript versions, and
    2 Node.js versions from a single codebase
    • Backward-incompatible API and syntax usage is immediately detected
    • Verified support for new Angular, TypeScript, and Node.js versions is usually as simple
    as adding a value to a list parameter in our CI workflow
    

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56. Building blocks for creating and
    structuring logs
    • LumberjackLogBuilder class
    • LumberjackLogFactory service
    • LumberjackLogger base service class
    • LumberScopedLogger base service class
    

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57. Lumberjack logger services
    • Conventional structuring of logged system events
    • Encapsulates implementation details
    • Abstraction layer between application code and Lumberjack logging
    • Logging level, log scope, log message, and static log payload can be changed without
    touching application code
    

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58. Thank you 👋
    🐦 @LayZeeDK
    ng add @ngworker/lumberjack
    

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