@atomist/sdm v2.1.6
Software Delivery Machine
Atomist framework enabling you to control your delivery and development process in code. Think of it as Spring Boot for software delivery.
What is a Software Delivery Machine?
A software delivery machine (SDM) is a development process in a box. It automates all steps in the flow from commit to production (potentially via staging environments), and many other actions, using the consistent model provided by the Atomist API for software.
Many teams have a blueprint in their mind for how they'd like to deliver software and ease their day to day work, but find it hard to realize. A Software Delivery Machine makes it possible.
The concept is explained in detail in Rod Johnson's blog Why you need a Software Delivery Machine. This video shows it in action.
Atomist is about developing your development experience by using your coding skills. Change the code, restart, and see your new automations and changed behavior across all your projects, within seconds.
Get Started
This repository contains an SDM framework built on lower level Atomist capabilities.
SDMs based on this framework process events from the Atomist SaaS event hub. The architecture is as follows, with events coming in from the systems that matter in your development process:
You'll need to be a member of an Atomist workspace to run an SDM. Create your own by enrolling at atomist.com. Things work best if you install an org webhook, so that Atomist receives events for all your GitHub repos.
Once the Atomist bot is in your Slack team, type @atomist create sdm
to have Atomist create a personalized SDM instance using this project. You can also clone the sample-sdm
project.
Once your SDM is running, type @atomist show skills
in any channel to see a list of all available Atomist commands.
Run Locally
SDM projects are Atomist automation clients, written in TypeScript or JavaScript. See run an automation client for instructions on how to set up your environment and run it under Node.js.
See set up for additional prerequisites depending on the projects you're building.
See the sample-sdm project project for instructions on how to run an SDM instance, and description of the out of the box functionality.
Core Concepts
Atomist is a flexible platform, enabling you to build your own automations or use those provided by Atomist or third parties. Because you're using a real programming language (not YAML or Bash), and you have access to a real ecosystem (Node), you can create a richer delivery experience than you've even imagined.
This project demonstrates Atomist as the API for software, exposing:
- What we know: The Atomist cortex, accessible through GraphQL queries and subscription joins
- What just happened: An event, triggered by a GraphQL subscription, which is contextualized with the existing knowledge
- What you're working on: A library that enables you to comprehend and manipulate the source code you're working on.
This project builds on other Atomist core functionality available from global automations, such as: Atomist lifecycle, showing commit, pull request and other activity through actionable messages.
Atomist is not tied to GitHub, but this repository focuses on using Atomist with GitHub.com or GitHub Enterprise.
Events
The heart of Atomist is its event handling. As your code flows from commit through to deployment and beyond, Atomist receives events, correlates the incoming data with its previous knowledge, and invokes your event handlers with rich context. This enables your automations to perform tasks such as:
- Scanning code for security or quality issues on every push
- Driving deployments and promotion between environments
- Performing custom actions on deployment, such as kicking off integration test suites.
The Atomist correlated event model also enables Atomist to provide you with visibility throughout the commit to deployment flow, in Slack or through the Atomist web dashboard.
Under the Hood: How it Works
Event handlers subscribe to events using GraphQL subscriptions against the Atomist cortex. The following GraphQL subscribes to completed builds, returning related data such as the last commit and any linked Slack channels:
subscription OnBuildComplete {
Build {
buildId
buildUrl
compareUrl
name
status
commit {
sha
message
repo {
name
owner
gitHubId
allowRebaseMerge
channels {
name
id
}
}
statuses {
context
description
state
targetUrl
}
}
}
}
When using TypeScript (our recommended language), an event handler can subscribe to such events with the benefit of strong typing. For example, this Atomist event handler can respond to the above GraphQL subscription:
@EventHandler("Set status on build complete",
GraphQL.subscriptionFromFile("graphql/subscription/OnBuildComplete.graphql"))
export class SetStatusOnBuildComplete implements HandleEvent<OnBuildComplete.Subscription> {
public async handle(event: EventFired<OnBuildComplete.Subscription>,
ctx: HandlerContext,
params: this): Promise<HandlerResult> {
This underlying GraphQL/event handler infrastructure is generic and powerful. However, many things are better done at a higher level. This project provides a framework above this infrastructure that makes typical tasks far easier, while not preventing you from breaking out into lower level functionality.
This repository includes event handlers that subscribe to the most important events in a typical delivery flow. This enables dynamic and sophisticated delivery processes that are consistent across multiple projects.
Goals and Listeners
The most important higher level SDM functionality relates to what happens on a push to a repository. An SDM allows you to process a push in any way you choose, but typically you want it to initiate a delivery flow.
Goals
An SDM allows you to set goals on push. Goals correspond to the actions that make up a delivery flow, such as build and deployment. Goals are not necessarily sequential--some may be executed in parallel--but certain goals, such as deployment, have preconditions (goals that must have previously completed successfully).
Goals are set using rules, which are typically expressed in a simple internal DSL. For example, the following rules use PushTest
predicates such as ToDefaultBranch
and IsMaven
to determine what goals to set for incoming pushes:
whenPushSatisfies(ToDefaultBranch, IsMaven, HasSpringBootApplicationClass, HasCloudFoundryManifest,
ToPublicRepo, not(NamedSeedRepo), not(FromAtomist), IsDeployEnabled)
.setGoals(HttpServiceGoals),
whenPushSatisfies(IsMaven, HasSpringBootApplicationClass, not(FromAtomist))
.itMeans("Spring Boot service local deploy")
.setGoals(LocalDeploymentGoals),
Push test predicates are easy to write using the Atomist API. For example:
export const IsMaven: PredicatePushTest = predicatePushTest(
"Is Maven",
async p => !!(await p.getFile("pom.xml")));
Goals are defined as follows:
export const HttpServiceGoals = new Goals(
"HTTP Service",
FingerprintGoal,
AutofixGoal,
ReviewGoal,
PushReactionGoal,
BuildGoal,
ArtifactGoal,
StagingDeploymentGoal,
StagingEndpointGoal,
StagingVerifiedGoal,
ProductionDeploymentGoal,
ProductionEndpointGoal);
It is possible to define new goals with accompanying implementations, making this approach highly extensible.
Listeners
We'll return to push tests shortly, but first let's consider the SDM listener concept.
While the goals set drive the delivery process, domain specific listeners help in goal implementation and allow observation of the process as it unfolds. Listener registrations allow selective listener firing, on only particular pushes. A registration includes a name (for diagnostics) and a PushTest
, narrowing on particular pushes.
For example, the following listener registration causes an automatic fix to be made on every push to a Node project, adding a license file if none is found:
sdm.addAutofixes({
name: "fix me",
pushTest: IsNode,
action: async cri => {
const license = await axios.get("https://www.apache.org/licenses/LICENSE-2.0.txt");
return cri.project.addFile("LICENSE", license.data);
},
})
The following listener observes a build, notifying any linked Slack channels of its status:
sdm.addBuildListeners(async br =>
br.addressChannels(`Build of ${br.id.repo} has status ${br.build.status}`));
SDM listeners are a layer above GraphQL subscriptions and event handlers that simplify common scenarios, and enable most functionality to be naturally expressed in terms of the problem domain. Listener implementations are also easily testable.
Common Listener Context
As with all good frameworks, we've tried to make the API consistent. All listener invocations include at least the following generally useful information:
export interface SdmContext {
/**
* Context of the Atomist EventHandler invocation. Use to run GraphQL
* queries, use the messageClient directly and find
* the team and correlation id
*/
context: HandlerContext;
/**
* If available, provides a way to address the channel(s) related to this event.
* This is usually, but not always, the channels linked to a
* In some cases, such as repo creation or a push to a repo where there is no linked channel,
* addressChannels will go to dev/null without error.
*/
addressChannels: AddressChannels;
/**
* Credentials for use with source control hosts such as GitHub
*/
credentials: ProjectOperationCredentials;
}
Most events concern a specific repository, and hence most listener invocations extend RepoContext
:
export interface RepoContext extends SdmContext {
/**
* The repo this relates to
*/
id: RemoteRepoRef;
}
Many repo-specific listeners are given access to the repository source, via the Project
abstraction:
export interface ProjectListenerInvocation extends RepoListenerInvocation {
/**
* The project to which this event relates. It will have been cloned
* prior to this invocation. Modifications made during listener invocation will
* not be committed back to the project (although they are acceptable if necessary, for
* example to run particular commands against the project).
* As well as working with
* project files using the Project superinterface, we can use git-related
* functionality fro the GitProject subinterface: For example to check
* for previous shas.
* We can also easily run shell commands against the project using its baseDir.
*/
project: GitProject;
}
The Project
interface is defined in @atomist/automation-client. It provides an abstraction to the present repository, with Atomist taking care of Git cloning and (if necessary) writing back any changes via a push. It is abstracted from the file system, making it easy to unit listeners accessing repository contents, using the InMemoryProject
and InMemoryFile
classes.
The Project API and sophisticated parsing functionality available on top of it is a core Atomist capability. Many events can only be understood in the context of the impacted code, and many actions are achieved by modifying code.
Push listeners also have access to the details of the relevant push:
export interface PushListenerInvocation extends ProjectListenerInvocation {
/**
* Information about the push, including repo and commit
*/
readonly push: OnPushToAnyBranch.Push;
}
Available Listener Interfaces
The following listener interfaces are available:
ArtifactListener
: Invoked when a new binary has been createdBuildListener
: Invoked when a build is complete.ChannelLinkListenerInvocation
: Invoked when a channel is linked to a repoClosedIssueListener
: Invoked when an issue is closedPushReactionListener
: Invoked in response to a code changeDeploymentListener
: Invoked when a deployment has succeededFingerprintDifferenceListener
: Invoked when a fingerprint has changedGoalsSetListener
: Invoked when goals are set on a pushListener
: Superinterface for all listenersNewIssueListener
: Invoked when an issue has been createdProjectListener
: Superinterface for all listeners that relate to a project and make the cloned project availablePullRequestListener
: Invoked when a pull request is raisedPushListener
: Superinterface for listeners to push eventsRepoCreationListener
: Invoked when a repository has been createdSupersededListener
: Invoked when a commit has been superseded by a subsequent commitTagListener
: Invoked when a repo is createdUpdatedIssueListener
: Invoked when an issue has been updatedUserJoiningChannelListener
: Invoked when a user joins a channelVerifiedDeploymentListener
: Invoked when an endpoint has been verified
Push Mappings
Let's now return to push mappings and goal setting. The PushMapping
interface is used to decide how to handle pushes. Normally it is used via the DSL we've seen.
export interface PushMapping<V> {
/**
* Name of the PushMapping. Must be unique
*/
readonly name: string;
/**
* Compute a value for the given push. Return undefined
* if we don't find a mapped value.
* Return DoNotSetAnyGoals (null) to shortcut evaluation of the present set of rules,
* terminating evaluation and guarantee the return of undefined if we've reached this point.
* Only do so if you are sure
* that this evaluation must be short circuited if it has reached this point.
* If a previous rule has matched, it will still be used.
* The value may be static
* or computed on demand, depending on the implementation.
* @param {PushListenerInvocation} p
* @return {Promise<V | undefined | NeverMatch>}
*/
valueForPush(p: PushListenerInvocation): Promise<V | undefined | NeverMatch>;
}
PushMapping
is a central interface used in many places.
A GoalSetter
is a PushMapping
that returns Goals
.
A PushTest
is simply a PushMapping
that returns boolean
.
Code Examples
Let's look at some examples of listeners.
Issue Creation
When a new issue is created, you may want to notify people or perform an action.
Listener interfaces
NewIssueListener
: NewIssueListener
Examples
The following example notifies any user who raises an issue with insufficient detail in the body, via a
direct message in Slack, and provides them with a helpful
link to the issue. Note that we make use of the
person available via the openedBy
field:
export async function requestDescription(inv: NewIssueInvocation) {
if (!inv.issue.body || inv.issue.body.length < 10) {
await inv.context.messageClient.addressUsers(
`Please add a description for new issue ${inv.issue.number}: _${inv.issue.title}_: ${inv.id.url}/issues/${inv.issue.number}`,
inv.issue.openedBy.person.chatId.screenName);
}
}
This is registed with a SoftwareDeliveryMachine
instance as follows:
sdm.addNewIssueListeners(requestDescription)
Using the credentials
on the NewIssueInvocation
, you can easily use the GitHub API to modify the issue, for example correcting spelling errors.
Repo Creation
We frequently want to respond to the creation of a new repository: For example, we may want to notify people, provision infrastructure, or tag it with GitHub topics based on its contents.
Listener interfaces
There are two scenarios to consider:
- The creation of a new repository.
RepoCreationListener
: RepoCreationListener - The first push to a repository, which uses the more generic ProjectListener
The second scenario is usually more important, as it is possible to create a repository without any source code or a master branch, which isn't enough to work with for common actions.
Examples
The following example publishes a message to the #general
channel in Slack when a new repo has been created:
export const PublishNewRepo: SdmListener = (i: ListenerInvocation) => {
return i.context.messageClient.addressChannels(
`A new repo was created: \`${i.id.owner}:${i.id.repo}\``, "general");
};
Tagging a repo with topics based on its content is a useful action. tagRepo
is a convenient function to construct a ProjectListener
for this. It tags as an argument a Tagger
, which looks at the project content and returns a Tags
object. The following example from atomist.config.ts
tags Spring Boot repos, using a Tagger
from the spring-automation
project, in addition to suggesting the addition of a Cloud Foundry manifest, and publishing the repo using the listener previously shown:
sdm.addNewRepoWithCodeActions(
tagRepo(springBootTagger),
suggestAddingCloudFoundryManifest,
PublishNewRepo)
ReviewerRegistration
ProjectReviewer
is a type defined in automation-client-ts
. It allows a structured review to be returned. The review comments can localize the file path, line and column if such information is available, and also optionally include a link to a "fix" command to autofix the problem.
The following is a simple project reviewer spots projects without a README, using the Project
API:
const hasNoReadMe: ReviewerRegistration = {
name: "hasNoReadme",
action: async cri => ({
repoId: cri.project.id,
comments: !!(await cri.project.getFile("README.me")) ?
[] :
[new DefaultReviewComment("info", "readme",
"Project has no README",
{
path: "README.md",
lineFrom1: 1,
offset: -1,
})],
}),
};
A slightly more complex example uses the saveFromFiles
utility method to look for and object to YAML files in Maven projects:
const rodHatesYaml: ReviewerRegistration = {
name: "rodHatesYaml",
pushTest: hasFile("pom.xml"),
action: async cri => ({
repoId: cri.project.id,
comments:
await saveFromFiles(cri.project, "**/*.yml", f =>
new DefaultReviewComment("info", "yml-reviewer",
`Found YML in \`${f.path}\`: Rod regards the format as an insult to computer science`,
{
path: f.path,
lineFrom1: 1,
offset: -1,
})),
}),
};
These reviewers can be added in an SDM definition as follows:
sdm.addProjectReviewers(hasNoReadme, rodHatesYaml);
AutofixRegistration
An AutofixRegistration
can automatically execute code fixes. An example, which adds a license to file if one isn't found:
export const AddLicenseFile: AutofixRegistration = editorAutofixRegistration({
name: "License Fix",
pushTest: not(hasFile(LicenseFilename)),
editor: async p => {
const license = await axios.get("https://www.apache.org/licenses/LICENSE-2.0.txt");
return p.addFile("LICENSE", license.data);
},
});
Note the use of the addFile
method on Project
. Atomist takes care of committing the change to the
branch of the push.
Registration with an SDM is simple:
sdm.addAutofixes(
AddAtomistJavaHeader,
AddAtomistTypeScriptHeader,
AddLicenseFile,
);
CodeActionRegistration interface
This registration allows you to react to the code, with information about the changes in the given push:
For example, the following function lists changed files to any linked Slack channels for the repo:
export const listChangedFiles: PushReactionRegistration = {
action(i: PushImpactListenerInvocation) {
return i.addressChannels(`Files changed:\n${i.filesChanged.map(n => "- `" + n + "`").join("\n")}`);
},
name: "List files changed",
};
If you don't have a custom name or PushTest, you can use the following shorthand:
export const listChangedFiles = i => i.addressChannels(`Files changed:\n${i.filesChanged.map(n => "- `" + n + "`").join("\n")}`);
Add in an SDM definition as follows:
sdm.addPushReactions(listChangedFiles)
If your reaction is essentially a review--for example, it's associated with a known problem in a particular file location--use a
ReviewerRegistration
rather than aPushReactionRegistration
.Important note: You must have set a
PushReactionGoal
for push reactions to be invoked
Fingerprints
A special kind of push listener relates to fingerprints.
Fingerprints are data computed against a push. Think of them as snapshots. Typically they reflect the state of the repository's source code after the push; they can also take into account other characteristics of the commit. Fingerprinting is valuable because:
- It enables us to assess the impact of a particular commit, through providing a semantic diff. For example, did the commit change dependencies? Did it change some particularly sensitive files that necessitate closer than usual review?
- It enables us to understand the evolution of a code base over time. Atomist persists fingerprints, so we can trace over time anything we fingerprint, and report against it. For example, what is happening to code quality metrics over time?
Atomist ships some out of the box fingerprints, such as Maven and npm
dependency fingerprints. But it's easy to write your own. Fingerprint registrations are like other listener registrations, specifying a name and PushTest
. The following example is the complete code for fingerprinting dependencies specified in a package-lock.json
file:
export class PackageLockFingerprinter implements FingerprinterRegistration {
public readonly name = "PackageLockFingerprinter";
public readonly pushTest: PushTest = IsNode;
public async action(cri: PushImpactListenerInvocation): Promise<FingerprinterResult> {
const lockFile = await cri.project.getFile("package-lock.json");
if (!lockFile) {
return [];
}
try {
const content = await lockFile.getContent();
const json = JSON.parse(content);
const deps = json.dependencies;
const dstr = JSON.stringify(deps);
return {
name: "dependencies",
abbreviation: "deps",
version: "0.1",
sha: computeShaOf(dstr),
data: json,
};
} catch (err) {
logger.warn("Unable to compute package-lock.json fingerprint: %s", err.message);
return [];
}
}
}
Fingerprinters can be added to an SDM as follows:
sdm.addFingerprinterRegistrations(new PackageLockFingerprinter());
Fingerprinting will only occur if a FingerprintGoal
is selected when goals are set.
Generators
Another important concern is project creation. Consistent project creation is important to governance and provides a way of sharing knowledge across a team.
Atomist's unique take on project generation starts from a seed project--a kind of golden master, that is version controlled using your regular repository hosting solution. A seed project doesn't need to include template content: It's a regular project in whatever stack, and Atomist transforms it to be a unique, custom project based on the parameters supplied at the time of project creation. This allows freedom to evolve the seed project with regular development tools.
Generators can be registered with an SDM as follows:
sdm.addGenerators(() => springBootGenerator({
...CommonJavaGeneratorConfig,
seedRepo: "spring-rest-seed",
intent: "create spring",
}))
The springBootGenerator
function used here is provided in sample-sdm
, but it's easy enough to write your own transformation using the Project
API. Here's most of the code in our real Node generator:
export function nodeGenerator(config: GeneratorConfig,
details: Partial<GeneratorCommandDetails<NodeProjectCreationParameters>> = {}): HandleCommand {
return generatorHandler<NodeProjectCreationParameters>(
transformSeed,
() => new NodeProjectCreationParameters(config),
`nodeGenerator-${config.seedRepo}`,
{
tags: ["node", "typescript", "generator"],
...details,
intent: config.intent,
});
}
function transformSeed(params: NodeProjectCreationParameters, ctx: HandlerContext) {
return chainEditors(
updatePackageJsonIdentification(params.appName, params.target.description,
params.version,
params.screenName,
params.target),
updateReadmeTitle(params.appName, params.target.description),
);
}
You can invoke such a generator from Slack, like this:
Note how the repo was automatically tagged with GitHub topics after creation. This was the work of a listener, specified as follows:
sdm.addNewRepoWithCodeActions(
tagRepo(springBootTagger),
);
With Atomist ChatOps supports, you can follow along in a linked channel like this:
Note the suggestion to add a Cloud Foundry manifest. This is the work of another listener, which reacts to finding new code in a repo. Listeners and commands such as generators work hand in hand for Atomist.
Editors
Another core concept is a project editor. An editor is a command that transforms project content. Atomist infrastructure can help persist such transformations through branch commits or pull requests, with clean diffs.
A Simple Editor
As you'd expect, editors also use th Project
API.
Here's an example of a simple editor that takes as a parameter the path of a file to remove from a repository.
@Parameters()
export class RemoveFileParams {
@Parameter()
public path: string;
}
export const removeFileEditor: HandleCommand = editorCommand<RemoveFileParams>(
() => removeFile,
"remove file",
RemoveFileParams,
{
editMode: params => commitToMaster(`You asked me to remove file ${params.path}!`),
});
async function removeFile(p: Project, ctx: HandlerContext, params: RemoveFileParams) {
return p.deleteFile(params.path);
}
Editors can be registered with an SDM as follows:
sdm.addEditors(
() => removeFileEditor,
);
Dry Run Editors
More elaborate editors use helper APIs on top of the Project
API such as Atomist's microgrammar API and ANTLR integration.
There's also an important capability called "dry run editing": Performing an edit on a branch, and then either raising either a PR or an issue, depending on build success or failure. This allows us to safely apply edits across many repositories. There's a simple wrapper function to enable this:
export const tryToUpgradeSpringBootVersion: HandleCommand = dryRunEditor<UpgradeSpringBootParameters>(
params => setSpringBootVersionEditor(params.desiredBootVersion),
UpgradeSpringBootParameters,
"boot-upgrade", {
description: `Upgrade Spring Boot version`,
intent: "try to upgrade Spring Boot",
},
);
This editor will upgrade the Spring Boot version in one or more projects, then wait to see if the builds succeed. Output will look like this (in the case of success):
Dry run editing is another example of how commands and events can work hand in hand with Atomist to provide a uniquely powerful solution.
Arbitrary Commands
Both generators and editors are special cases of Atomist command handlers, which can be invoked via Slack or HTTP. You can write commands to ensure that anything that needs to be repeated gets done the right way each time, and that the solution isn't hidden on someone's machine.
Pulling it All Together: The SoftwareDeliveryMachine
class
Your ideal delivery blueprint spans delivery flow, generators, editors and other commands. All we need is something to pull it together.
Your event listeners need to be invoked by Atomist handlers. The SoftwareDeliveryMachine
takes care of this, ensuring that the correct handlers are emitted for use in atomist.config.ts
, without you needing to worry about the event handler registrations on underlying GraphQL.
The SoftwareDeliveryMachine
class offers a fluent builder approach to adding command handlers, generators and editors.
Example
For example:
const sdm = createSoftwareDeliveryMachine(
{
builder: K8sBuildOnSuccessStatus,
deployers: [
K8sStagingDeployOnSuccessStatus,
K8sProductionDeployOnSuccessStatus,
],
artifactStore,
},
whenPushSatisfies(PushToDefaultBranch, IsMaven, IsSpringBoot, HasK8Spec, PushToPublicRepo)
.setGoals(HttpServiceGoals),
whenPushSatisfies(not(PushFromAtomist), IsMaven, IsSpringBoot)
.setGoals(LocalDeploymentGoals),
whenPushSatisfies(IsMaven, MaterialChangeToJavaRepo)
.setGoals(LibraryGoals),
whenPushSatisfies(IsNode).setGoals(NpmGoals),
);
sdm.addNewRepoWithCodeActions(suggestAddingK8sSpec)
.addSupportingCommands(() => addK8sSpec)
.addSupportingEvents(() => NoticeK8sTestDeployCompletion,
() => NoticeK8sProdDeployCompletion)
.addEndpointVerificationListeners(
lookFor200OnEndpointRootGet({
retries: 15,
maxTimeout: 5000,
minTimeout: 3000,
}),
);
sdm.addNewIssueListeners(requestDescription)
.addEditors(() => tryToUpgradeSpringBootVersion)
.addGenerators(() => springBootGenerator({
seedOwner: "spring-team",
seedRepo: "spring-rest-seed",
groupId: "myco",
}))
.addNewRepoWithCodeActions(
tagRepo(springBootTagger),
suggestAddingCloudFoundryManifest,
PublishNewRepo)
.addProjectReviewers(logReview)
.addPushReactions(listChangedFiles)
.addFingerprinters(mavenFingerprinter)
.addDeploymentListeners(PostToDeploymentsChannel)
.addEndpointVerificationListeners(LookFor200OnEndpointRootGet)
.addVerifiedDeploymentListeners(presentPromotionButton)
.addSupersededListeners(
inv => {
logger.info("Will undeploy application %j", inv.id);
return LocalMavenDeployer.deployer.undeploy(inv.id);
})
.addSupportingCommands(
() => addCloudFoundryManifest,
DescribeStagingAndProd,
() => disposeProjectHandler,
)
.addSupportingEvents(OnDryRunBuildComplete);
The SoftwareDeliveryMachine
instance will create the necessary Atomist event handlers to export.
In atomist.config.ts
you can bring them in simply as follows:
commands: assembled.commandHandlers,
events: assembled.eventHandlers,
Structure of This Project
src/api
is the public user-facing API, including the software delivery machine concept that ties everything together. This may be extracted into its own Node module in future.src/spi
contains interfaces to be extended in integrations with infrastructure, such as artifact storage, logging, build and deployment.src/graphql
contains GraphQL queries. You can add fields to existing queries and subscriptions, and add your own.src/typings
is where types generated from GraphQL wind up. Refresh these withnpm run gql:gen
if you update any GraphQL files insrc/graphql
.src/util
contains miscellaneous utilities.src/internal
contains lower level code such as event handlers necessary to support the user API. This is not intended for user use.src/pack
contains "extension packs." These will ultimately be extracted into their own Node modules.- The other directories unders
src
contain useful functionality that may eventually be moved out of this project.
The types from src/api
can be imported into downstream projects from the index.ts
barrel.
Plugging in Third Party Tools
This repo shows the use of Atomist to perform many steps itself. However, each of the goals used by Atomist here is pluggable.
It's also easy to integrate third party tools like Checkstyle.
Integrating CI tools
One of the tools you are most likely to integrate is CI. For example, you can integrate Jenkins, Travis or Circle CI with Atomist so that these tools are responsible for build. This has potential advantages in terms of scheduling and repeatability of environments.
Integrating a CI tool with Atomist is simple. Simply invoke Atomist hooks to send events around build and artifact creation.
If integrating CI tools, we recommend the following:
- CI tools are great for building and generating artifacts. They are often abused as a PaaS for
bash
. If you find your CI usage has you programming inbash
or YML, consider whether invoking such operations from Atomist event handlers might be a better model. - Use Atomist generators to create your CI files, and Atomist editors to keep them in synch, minimizing inconsistency.
Integrating APM tools
tbd
Integrating with Static Analysis Tools
Any tool that runs on code, such as Checkstyle, can easily be integrated.
If the tool doesn't have a Node API (which Checkstyle doesn't as it's written in Java), you can invoke it via Node spawn
, as Node excels at working with child processes.
Advanced Push Rules
Computed Values
You can use computed boolean
values or the results of synchronous or asynchronous functions returning boolean
in the DSL, making it possible to bring in any state you wish. For example:
whenPushSatisfies(IsMaven, HasSpringBootApplicationClass,
deploymentsToday < 25)
.itMeans("Not tired of deploying Spring apps yet")
.setGoals(LocalDeploymentGoals),
Decision Trees
You can write decision trees in push rules or other push mappings. These can be nested to arbitrary depth, and can use computed state. For example:
let count = 0;
const pm: PushMapping<Goals> = given<Goals>(IsNode)
// Compute a value we'll use later
.init(() => count = 0)
.itMeans("node")
.then(
given<Goals>(IsExpress).itMeans("express")
.compute(() => count++)
// Go into tree branch rule set
.then(
whenPushSatisfies(count > 0).itMeans("nope").setGoals(NoGoals),
whenPushSatisfies(TruePushTest).itMeans("yes").setGoals(HttpServiceGoals),
),
);
"Contribution" Style
tbd
Roadmap
This project is under active development, and still in flux. Some goals:
- Splitting out
sdm-api
project with the contents of thesrc/api
directory - Extracting the extension packs under
src/pack
into their own Node modules.
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