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says COMPUTER no SEBASTIANO POGGI @seebrock3r JetBrains

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Catch those silly bugs early Static Analysis

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Code Quality • It’s important • Consistency • Never fix the same bug twice • Have less bugs in the first place • A safety net to catch easy mistakes

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Code Quality • How do you achieve a baseline of code quality? • Testing • Static Analysis • CI

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Testing • DO TEST! • Unit AND Integration • Too big of a topic for this talk

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Static Analysis • Tools that analyse code statically • Only look at code “at rest”, not at runtime • Check for common bugs/oversights • May involve analysing compiled bytecode • Check for code style violations

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Static Analysis • We come from Java • Some still stuck there • Java has a lot of static analysis tools • Most free/FOSS, but many commercial

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Static Analysis • The “holy trinity” • Findbugs (prefer Spotbugs) • PMD • Checkstyle • Plenty of others • Error Prone, Infer, Android Lint, …

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Static Analysis • And don’t forget your IDE! • Android Studio/IDEA inspections • In-editor and on-demand • Code formatter

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So what about Kotlin?

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Static Analysis • Android Lint works • IDEs still have inspections • Not as many/as complex as Java • But it’s getting better all the time The good

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Static Analysis • Almost nothing else from the Java world is compatible • No first-party tools from JetBrains • Apart from the IDE inspections • IDE Formatter isn’t often strict enough either The bad

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Static Analysis The hope — third party tools • ktlint • “An anti-bike shedding Kotlin Linter with built-in formatter” • Detekt • “Static code analysis for Kotlin” • SonarQube

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Static Analysis • “An anti-bike shedding Kotlin Linter with built-in formatter” • “Anti-bike shedding” • Avoids pointless discussions… • …by simply not offering customisation • “Linter” • Verifies code quality by looking for potential errors • Only looks at source code ktlint

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Static Analysis • Equivalent to Checkstyle, just not as configurable • Follows Kotlin official style guide • Support for Android Kotlin styling with --android • Auto-fix many violations with -F • Minimal configuration via .editorconfig ktlint

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Static Analysis • Static Code Analyser • Like PMD/Findbugs • Inspects code and AST • Does not inspect compiled bytecode • Limited type resolution capabilities Detekt

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Static Analysis • Configurable via YAML file • default-detekt-config.yml for defaults • Use :detektGenerateConfig to get started • buildUponDefaultConfig is recommended • Has IDEA/AS plugin • Shows violations in the editor Detekt

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Static Analysis • Java support is great • Kotlin is kinda supported • Via Android Lint and Detekt • Not nearly as comprehensively as other languages • Good if you are migrating to Kotlin and still have a bunch of Java • Keep an eye on everything from one place SonarQube

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Static Analysis • There is some good Kotlin stuff out there • No excuses not to use it! • Java has been around almost 24 years • Kotlin is much younger, less widespread (for now) • It needs time for tooling to catch up with Java • Listen to your IDE inspections, use all the tools you have Recap

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Empower your Static Analysis CI

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CI • Continuous Integration • Not a new concept — since the ‘90s • Popularised by XP (eXtreme Programming)

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CI • Continuously Integrate all changes • Catch issues ASAP • Leverage build system + compiler + tests + static analysis

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CI • CI is a practice • Software and services to implement it • We generally use “CI servers”

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Why adopting CI? • Take out the human factor • People forget to run checks • Save devs’ time • Run on-demand or scheduled • Nightlies, PRs, main branch, etc

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CI services • Two main kinds • Self-hosted • In-cloud

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CI services • Jenkins, TeamCity, etc • More enterprise-friendly and customisable • Require setup and maintenance Self-hosted

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CI services • Travis CI, CircleCI, Bitrise, GitLab CI, Google Cloud Build, etc • Easier to adopt, better for individuals and small companies • No/little setup and maintenance • Not as enterprise-friendly, and can be costly In-cloud

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CI services • Two main kinds • Self-hosted • In-cloud some blur the lines

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No content

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No ca$h? No worries. • Most CI services offer a free tier • Open source (public) projects • Free build executor(s) • Free CPU time • Free for up to N users

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Anatomy of a CI • Nodes • Master • Agents/executors Master node • Orchestrates jobs • Delegates actual work • Self-hosted vs In-Cloud

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Anatomy of a CI • Nodes • Master • Agents/executors Master node • Orchestrates jobs • Delegates actual work • Self-hosted vs In-Cloud

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Anatomy of a CI • Nodes • Master • Agents/executors Agents/executors • Run actual jobs’ work • Machines or containers • Most commonly Linux …but there’s macOS & Windows too

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THE CI BUILD JOB BUILD JOB BUILD JOB The build queue

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THE CI BUILD JOB BUILD JOB BUILD JOB The build queue

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THE CI BUILD JOB BUILD JOB BUILD JOB The build queue

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THE CI BUILD JOB BUILD JOB The build queue

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THE CI BUILD JOB The build queue

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THE CI The build queue

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RELEASE ONLY :app:assemble :app:test :app:lint :app:detekt A typical job :app:ktlintCheck

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RELEASE ONLY :app:assemble :app:test :app:lint :app:detekt A typical job :app:ktlintCheck

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RELEASE ONLY :app:assemble :app:test :app:lint :app:detekt A typical job :app:ktlintCheck

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:app:assemble :app:test :app:lint :app:detekt :app:ktlintCheck :app:build A typical job

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:app:assembleRelease A better job :app:testRelease :app:cAT :app:lintRelease

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:app:assembleRelease A better job :app:testRelease :app:cAT :app:lintRelease

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:app:assembleRelease A better job :app:testRelease :app:cAT :app:lintRelease

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:app:assembleRelease A better job :app:testRelease :app:cAT :app:lintRelease

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:app:assembleRelease A better job :app:testRelease :app:cAT :app:lintRelease

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:app:assembleRelease A better job :app:testRelease :app:cAT :app:lintRelease

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:app:assembleRelease :app:testRelease :app:cAT :app:lintRelease

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:app:assembleRelease :app:testRelease :app:cAT :app:lintRelease T1

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T2 T1 :app:assembleRelease :app:testRelease :app:cAT :app:lintRelease

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Pipelines • Group of jobs executed in stages • Can be parallelised • Can take less time than monolithic builds • Supported almost everywhere in some form

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Pipelines • Group of jobs executed in stages • Can be parallelised • Can take less time than monolithic builds • Supported almost everywhere in some form Other names • Workflow • Build chain

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Pipelines • Group of jobs executed in stages • Can be parallelised • Can take less time than monolithic builds • Supported almost everywhere in some form YES. YES, YOU SHOULD
 USE PIPELINES.

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checkout warm up connected test unit test static analysis build apk Test different combinations! Pipelines

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checkout warm up connected test unit test static analysis build apk Test different combinations! Pipelines

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A case study CircleCI

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Why CircleCI? • Widely adopted in the community • Most cloud CIs work similarly • We have an example ready!

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CircleCI • Docker-based • Configured with YAML • We’ll use 2.1 • Free tiers • 1x Linux executor • 4x plan for Open Source

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Our example • Squanchy — https://github.com/squanchy-dev/squanchy-android • FOSS conference app • 100% Kotlin • Unit tests, but no instrumented tests • Static analysis: Android Lint, Detekt, ktlint • Not very modular

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Getting started • Working Gradle build • Identify the tasks to execute • Both in Gradle and outside Gradle • Identify the secrets to inject • Use environment variables

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./gradlew build

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Getting started • Working Gradle build • • Both in Gradle and outside Gradle • Identify the secrets to inject • Use environment variables Identify the tasks to execute

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Unit tests Static analysis :testRelease :lintRelease :detekt :ktlintCheck Warm up :downloadDependencies Checkout [not Gradle]

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Getting started • Working Gradle build • Identify the tasks to execute • Both in Gradle and outside Gradle • • Use environment variables Identify the secrets to inject

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API keys Play Services JSON Other values APPLICATION_ID FABRIC_API_KEY ALGOLIA_APPLICATION_ID ALGOLIA_API_KEY ALGOLIA_INDICES_PREFIX

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API keys Play Services JSON Other values APPLICATION_ID FABRIC_API_KEY ALGOLIA_APPLICATION_ID ALGOLIA_API_KEY ALGOLIA_INDICES_PREFIX

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Play Services JSON Other values APPLICATION_ID API keys FABRIC_API_KEY ALGOLIA_APPLICATION_ID ALGOLIA_API_KEY ALGOLIA_INDICES_PREFIX Protip! Use Novoda’s gradle-build-properties-plugin applicationId(applicationProps['applicationId'].or(envVars['APPLICATION_ID']).string) manifestPlaceholders += [ fabricApiKey: secretsProps['fabricApiKey'].or(envVars['FABRIC_API_KEY']).string ] resValueString 'app_name', applicationProps['applicationName'].or("Squanchy") resValueString 'algolia_application_id', applicationProps[‘algoliaId'] .or(envVars['ALGOLIA_APPLICATION_ID']) resValueString 'algolia_api_key', secretsProps[‘algoliaApiKey'] .or(envVars['ALGOLIA_API_KEY']) resValueString 'algolia_indices_prefix', applicationProps[‘algoliaIndicesPrefix'] .or(envVars[‘ALGOLIA_INDICES_PREFIX']) resValueString 'deeplink_scheme', applicationProps['deeplinkScheme'].or("squanchy")

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Getting started • Working Gradle build • Identify the tasks to execute • Both in Gradle and outside Gradle • Identify the secrets to inject • Use environment variables

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Configure CircleCI • YAML file • /.circleci/config.yml • Versioned • Currently 2.1

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version: 2.1 executors: android: working_directory: ~/squanchy docker: - image: circleci/android:api-28 environment: ANDROID_HOME: /opt/android/sdk APPLICATION_ID: net.squanchy.example FABRIC_API_KEY: 0000000000000000000000000000000000000000 ALGOLIA_APPLICATION_ID: ABCDEFGH12 ALGOLIA_API_KEY: 00000000000000000000000000000000 ALGOLIA_INDICES_PREFIX: squanchy_dev commands: # Build Tools cache commands restore_build_tools_cache: steps: - restore_cache: name: Restore Android build tools cache keys: - v3-build-tools-{{ checksum "workspace/repo/.circleci/config.yml" }}-{{ checksum "workspace/repo/gradle.properties" }}-{{ checksum "workspace/repo/dependencies.gradle" }} save_build_tools_cache: steps: - save_cache: name: Save Android build tools cache paths: - /opt/android/sdk/build-tools key: v3-build-tools-{{ checksum "workspace/repo/.circleci/config.yml" }}-{{ checksum "workspace/repo/gradle.properties" }}-{{ checksum "workspace/repo/dependencies.gradle" }} # Gradle cache commands restore_gradle_cache: steps: - restore_cache: name: Restore Gradle dependencies cache keys: - v1-gradle-dependencies-{{ checksum "workspace/repo/.circleci/config.yml" }}-{{ checksum "workspace/repo/gradle.properties" }}-{{ checksum "workspace/repo/dependencies.gradle" }} - restore_cache: name: Restore Gradle wrapper cache keys: - v1-gradle-wrapper-{{ checksum "workspace/repo/.circleci/config.yml" }}-{{ checksum "workspace/repo/gradle/wrapper/gradle-wrapper.properties" }} save_gradle_cache: steps: - save_cache: name: Save Gradle dependencies cache paths: - ~/.gradle/caches key: v1-gradle-dependencies-{{ checksum "workspace/repo/.circleci/config.yml" }}-{{ checksum "workspace/repo/gradle.properties" }}-{{ checksum "workspace/repo/dependencies.gradle" }} - save_cache: name: Save Gradle wrapper cache paths: - ~/.gradle/wrapper key: v1-gradle-wrapper-{{ checksum "workspace/repo/.circleci/config.yml" }}-{{ checksum "workspace/repo/gradle/wrapper/gradle-wrapper.properties" }} # Android Gradle build cache commands restore_android_build_cache: steps: - restore_cache: name: Restore Android Gradle build cache keys: - v3-build-cache-{{ checksum "workspace/repo/.circleci/config.yml" }}-{{ checksum "workspace/repo/gradle.properties" }}-{{ checksum "workspace/repo/dependencies.gradle" }} save_android_build_cache: steps: - save_cache: name: Save Android Gradle build cache paths: - ~/.android/build-cache key: v3-build-cache-{{ checksum "workspace/repo/.circleci/config.yml" }}-{{ checksum "workspace/repo/gradle.properties" }}-{{ checksum "workspace/repo/dependencies.gradle" }} ensure_android_sdk_is_ready: steps: - run: name: Ensure Android SDK install is up-to-date command: workspace/repo/.circleci/ci-scripts/ensure-sdkmanager.sh download_gradle_dependencies: steps: - run: name: Download Gradle dependencies command: cd workspace/repo/ && ./gradlew downloadDependencies restore_workspace: steps: - attach_workspace: at: workspace jobs: checkout: executor: android steps: - checkout: path: workspace/repo # Prepare the container for the build - ensure_android_sdk_is_ready - run: name: Create mock Play Services JSON command: workspace/repo/.circleci/ci-scripts/ci-mock-google-services-setup.sh # Persist repo code - persist_to_workspace: root: workspace paths: - repo prepare_for_checks: executor: android steps: - restore_workspace - restore_gradle_cache - restore_android_build_cache - restore_build_tools_cache - download_gradle_dependencies - save_android_build_cache - save_gradle_cache - save_build_tools_cache # Persist built app code - persist_to_workspace: root: workspace paths: - repo/app/build static_analysis: executor: android steps: - restore_workspace - restore_gradle_cache - restore_android_build_cache - restore_build_tools_cache # See https://issuetracker.google.com/issues/62217354 for the parallelism option - run: name: Run static analysis command: cd workspace/repo && ./gradlew lintRelease detekt ktlintCheck -Djava.util.concurrent.ForkJoinPool.common.parallelism=2 # Collect static analysis reports as build artifacts - store_artifacts: path: workspace/repo/app/build/reports destination: reports tests: executor: android steps: - restore_workspace - restore_gradle_cache - restore_android_build_cache - restore_build_tools_cache # See https://issuetracker.google.com/issues/62217354 for the parallelism option - run: name: Run unit tests command: cd workspace/repo && ./gradlew testRelease -Djava.util.concurrent.ForkJoinPool.common.parallelism=2 # Collect JUnit test results - store_test_results: path: workspace/repo/app/build/test-results workflows: version: 2 build_and_test: jobs: - checkout - prepare_for_checks: requires: - checkout - static_analysis: requires: - prepare_for_checks - tests: requires: - prepare_for_checks

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version: 2.1 #... commands: jobs: workflows: #... #... #... executors:

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version: 2.1 #... commands: jobs: workflows: #... #... #... executors:

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workflows: #... jobs: #... commands: #... #... executors: version: 2.1 android: working_directory: ~/squanchy docker: - image: circleci/android:api-28 environment: ANDROID_HOME: /opt/android/sdk APPLICATION_ID: net.squanchy.example FABRIC_API_KEY: 0000000000000000000000000000000000000000 ALGOLIA_APPLICATION_ID: ABCDEFGH12 ALGOLIA_API_KEY: 00000000000000000000000000000000 ALGOLIA_INDICES_PREFIX: squanchy_dev

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commands: #... executors: version: 2.1 android: working_directory: ~/squanchy docker: - image: circleci/android:api-28 environment: ANDROID_HOME: /opt/android/sdk APPLICATION_ID: net.squanchy.example FABRIC_API_KEY: 0000000000000000000000000000000000000000 ALGOLIA_APPLICATION_ID: ABCDEFGH12 ALGOLIA_API_KEY: 00000000000000000000000000000000 ALGOLIA_INDICES_PREFIX: squanchy_dev

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workflows: #... jobs: #... commands: #... #... executors: version: 2.1 # Build Tools cache commands restore_build_tools_cache: steps: - restore_cache: name: Restore Android build tools cache keys: - v3-build-tools-{{ checksum "workspace/ repo/.circleci/config.yml" }}-{{ checksum "workspace/repo/gradle.properties" }}-{{ checksum

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commands: #... # Build Tools cache commands restore_build_tools_cache: steps: - restore_cache: name: Restore Android build tools cache keys: - v3-build-tools-{{ checksum "workspace/ repo/.circleci/config.yml" }}-{{ checksum "workspace/repo/gradle.properties" }}-{{ checksum "workspace/repo/dependencies.gradle" }} save_build_tools_cache: steps: - save_cache: name: Save Android build tools cache paths:

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command_name: steps: - step_name: name: Description (shown in UI) other_stuff: - {depends on step}

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- attach_workspace: at: path/to/attach/to

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- save_cache: name: Saves path(s) to CircleCI cache paths: - /path/to/save keys: - v1-my-cache-{{ checksum "some/thing" }}

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- restore_cache: name: Restores from CircleCI cache keys: - v1-my-cache-{{ checksum "some/thing" }}

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- run: name: Executes something in workspace command: my-script.sh param1 param2

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#... workflows: jobs: #... commands: restore_build_tools_cache save_build_tools_cache restore_gradle_cache save_gradle_cache restore_android_build_cache save_android_build_cache ensure_android_sdk_is_ready download_gradle_dependencies restore_workspace

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workflows: #... jobs: #... commands: #... #... executors: version: 2.1 checkout: executor: android steps: - checkout: path: workspace/repo

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jobs: #... checkout: executor: android steps: - checkout: path: workspace/repo # Prepare the container for the build - ensure_android_sdk_is_ready - run: name: Create mock Play Services JSON command: workspace/repo/.circleci/ci-scripts/ci-mock- google-services-setup.sh # Persist repo code - persist_to_workspace:

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job_name: executor: executor_name steps: - step_name: name: Description (shown in UI) other_stuff: - {depends on step} - command_name

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workflows: #... jobs: #... commands: #... #... executors: version: 2.1 checkout prepare_for_checks static_analysis tests

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workflows: #... jobs: #... commands: #... #... executors: version: 2.1 version: 2 build_and_test: jobs:

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workflows: #... #... version: 2 build_and_test: jobs: - checkout - prepare_for_checks: requires: - checkout - static_analysis: requires: - prepare_for_checks - tests: requires: - prepare_for_checks

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workflows: #... #... version: 2 build_and_test: jobs: - checkout - prepare_for_checks: requires: - checkout - static_analysis: requires: - prepare_for_checks - tests: requires: - prepare_for_checks checkout static analysis prepare for checks tests Directed Acyclic Graph

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A CI run in detail checkout static analysis prepare for checks tests

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A CI run in detail checkout static analysis prepare for checks tests

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A CI run in detail checkout setup android sdk create mock gms json persist to workspace checkout

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A CI run in detail checkout setup android sdk create mock gms json persist to workspace checkout

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A CI run in detail checkout static analysis prepare for checks tests

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A CI run in detail restore from workspace restore caches download dependencies persist to workspace prepare for checks save caches

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A CI run in detail restore from workspace restore caches download dependencies persist to workspace prepare for checks save caches

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A CI run in detail checkout static analysis prepare for checks tests

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A CI run in detail restore from workspace restore caches run tasks store artefacts static analysis and tests

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A CI run in detail restore from workspace restore caches run tasks store artefacts static analysis and tests

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get stuff

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get stuff do stuff save stuff

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What are today’s lessons? Conclusions

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• Static analysis is good • Use static analysis! • Continuous Integration is good • Use a CI! • Static analysis is even better with a CI • Check out Squanchy • https://github.com/squanchy-dev/squanchy-android

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THANK YOU bit.ly/computersaysno-ch SEBASTIANO POGGI @seebrock3r JetBrains