78 lines
4.3 KiB
Markdown
78 lines
4.3 KiB
Markdown
# Platform architecture
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Ekklesia is a long-lived platform from which churches can compose many applications and user
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experiences. It begins as a modular monolith so contracts can stabilize before distribution is
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introduced.
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## Dependency model
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The arrows below mean "depends on." Presentation and composition depend on stable lower-level
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contracts; infrastructure never learns individual feature names.
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```text
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Surface Builder configuration -> Surfaces -> public capability contracts
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^
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HTTP/API and client contracts
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Feature Modules -> Module SDK / platform contracts <- Core implementations
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```
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The four ownership layers are:
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1. **Core** orchestrates generic platform infrastructure: startup, identity, permissions,
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configuration, database connectivity, storage, events, jobs, module discovery, and lifecycle.
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2. **Modules** own backend domain behavior, data schemas, resources, actions, routes, events,
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permissions, and jobs.
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3. **Surfaces** own every presentation concern: components, renderers, layout, navigation,
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accessibility, interaction, branding, and client state.
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4. **Surface Builder** stores validated declarative composition. It selects capabilities and
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surface-owned renderers but contains neither executable code nor module business logic.
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Modules do not own UI. For example, Calendar data, actions, and permissions will live in
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`modules/calendar`; Calendar renderers for a dashboard or public website will live in those
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surfaces.
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## Stable seams
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- Modules use public SDK ports and injected Core services, never undocumented Core internals.
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- Modules do not import another module's schema or private code. Integrations use public service
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contracts, capabilities, events, or APIs.
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- Surfaces consume API/client and capability contracts, never feature-module packages.
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- Core discovers feature modules generically. It contains no feature-specific imports or
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conditional branches.
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- Deployable apps are thin composition roots and do not become domain-logic owners.
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- Generated bootstrap artifacts may connect discovered entry points at the application edge;
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they do not become manually maintained Core registries.
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## Security invariants
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- Authorization is enforced server-side.
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- Secrets are isolated from public configuration and logs.
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- Authentication tokens, private form content, prayer requests, and pastoral information are not
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logged.
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- Sensitive actions are designed for auditability without copying sensitive content into audit
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records.
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- Private objects use signed access and namespaced storage paths.
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- Every network service starts from least-privilege and local-only development defaults.
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## Current implementation status
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Implemented now: the Phase 1 repository and infrastructure foundation plus public module contracts,
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static versioned manifests, independent capability versions and dependency ranges, automatic
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filesystem discovery, compiled server loading, runtime-definition verification, staged capability
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registration, dependency-ordered startup and reverse shutdown, rollback, and a backend-only module
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template. Optional compiled schema entrypoints now contribute validated, namespaced module-owned
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Drizzle tables to a deterministic aggregate without connecting to a database. Optional module-owned
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Drizzle migration directories now produce an atomic dependency-ordered offline inventory with
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validated metadata, explicit destructive-change declarations, and exact SHA-256 checksums. Core can
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now compare that inventory with its fixed PostgreSQL history table, produce a read-only plan, and
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apply the complete pending batch under a session advisory lock and one transaction. Destructive
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migrations require an exact externally supplied approval bound to module, identity, and checksum.
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Hermetic integration coverage now exercises those contracts through the production adapter against
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the pinned PostgreSQL container, including real DDL rollback and advisory-lock concurrency.
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Target architecture, not yet implemented: production approval-provider composition, Better Auth,
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permission enforcement, physical storage-bucket provisioning, Surface SDK, richer public resource
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and action contracts, API server, dashboard, Builder, and reference feature modules.
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