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+---
+title: "API & Pipeline"
+date: 2024-05-29
+description: "KernelCI API and Pipeline"
+weight: 2
+---
+
+## API Overview
+
+The KernelCI API is a server-side service which provides two main features: a
+database abstraction and a publisher / subscriber interface.  Another important
+concept is the fact that users own the data they send to the API.  Let's have a
+quick look at how this all fits together.
+
+### Database Abstraction
+
+All the data managed by KernelCI is stored in a MongoDB database using node
+objects.  These can contain data about any part of the testing hierarchy such
+as a kernel revision, a build, static test results, runtime functional tests,
+regressions etc.  Each node has a parent so they form a simple tree.  There is
+typically one root node for each kernel revision with lots of child nodes
+containing all the test data that relates to it.
+
+Each node object also has a state which can be used when orchestrating the
+pipeline.  For example, a node will be in the Running state while awaiting some
+results.  There's also a result value, to tell whether the related pipeline
+step that produced the node passed or failed.  Finally there's a list of
+artifacts with URLs to know where to find all the related files (binaries,
+logs, generated results etc.).
+
+> **Note:** The API doesn't manage storage, the only requirement is to provide
+> publicly-available HTTP(S) URLs for each artifact.
+
+### Publisher / Subscriber Interface
+
+Every time some data changes in the database, basically every time a node
+has been added or updated, an event is sent on the Publisher / Subscriber
+interface (Pub/Sub).  For example, when a new kernel revision is found and a
+new node is created for it, an event will be sent to tell subscribers about it
+with something like "A checkout node has been created for kernel revision
+v6.2-rc4".  The actual event is a [CloudEvents](https://cloudevents.io) object
+with some JSON data containing a subset of the corresponding node database
+entry.
+
+Any client code can subscribe to receive events with an API token and implement
+features based on how to handle these events.  The API generates events
+automatically whenever nodes are changing but clients may also use the
+interface to publish their own events and coordinate other parts of the
+pipeline too.
+
+### User Ownership
+
+Interacting with the API requires a token which is associated with a particular
+user.  Whenever a user sends some data such as a new node, it is owned by that
+user.  While all nodes are publicly readable, only the owner of the node can
+update it.  Users can also belong to groups to share data with other users.
+
+While the main KernelCI pipeline will be creating nodes with users from a
+particular `kernelci.org` group, all the other users can create their own data
+which will coexist in the database.  Then your own nodes can have parents
+created by users.  For example, you may submit test results that relate to a
+kernel build provided by KernelCI.
+
+## Pipeline
+
+The Pipeline is made up of all the client-side services that run the actual
+workloads that produces data and artifacts.  It's orchestrated based on events
+from the Pub/Sub interface and all the data is managed via the API.  For
+example, the pipeline is responsible for detecting new kernel revision,
+scheduling builds and tests, sending email reports and detecting regressions.
+However, any other service which has an API token is in fact part of the
+extended pipeline too.
+
+Pipeline services are also responsible for uploading various kinds of artifacts
+to some independent storage services and provide public URLs to access them.
+Artifacts typically include kernel source code tarballs, build artifacts, logs
+and test results in some raw format before they were submitted to the API.
+
+## Instances
+
+### Staging
+
+An instance has been set up on `staging.kernelci.org` for testing all pending
+changes.  The Docker logs are available in real-time via a [web
+interface](https://staging.kernelci.org:9088/) for both the API and the
+pipeline.  It also provides some [interactive API
+documentation](https://staging.kernelci.org:9000/latest/docs).  This instance
+is not stable, it's redeployed periodically with all open pull requests from
+GitHub merged together on a test integration branch.
+
+### Early Access
+
+In preparation for a full production roll-out, an [Early
+Access](/docs/api/early-access) instance has been deployed in the Cloud (AKS)
+on `kernelci-api.eastus.cloudapp.azure.com`.  This is stable enough to let
+users give it a try as some form of beta-testing and is used as a candidate
+solution for an initial production deployment in the coming months.  Like
+staging, it has an auto-generated [interactive API
+documentation](https://kernelci-api.eastus.cloudapp.azure.com/latest/docs).
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