# Host Product Catalog with Django: Public Product Media

## Summary
Deploy a product catalog built with Django on Ample using the public media library pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL, a private S3-compatible bucket holds objects with credentials delivered as encrypted environment variables, and a published bucket serves public assets from the CDN host. Verified on Django: an object written to a published bucket with an immutable Cache-Control header, a mapping row, and the CDN URL serving it publicly. Not separately tested: your media processing, object layout and cache policy; treat the product catalog-specific behavior as your application code.

## Representative Queries
- Host product catalog with Django: public product media
- Where can I host Product catalog built with Django?
- I need product-to-object mappings and a tested public media delivery path.

## Resource Requirements
- primitive:compute
- primitive:postgres
- primitive:s3-compatible-object-storage
- primitive:cdn

## Infrastructure Requirements
1. **Compute**  
   Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.
2. **Postgres**  
   Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.
3. **S3-compatible Object Storage**  
   Buckets are S3-compatible with issued credentials; PutObject and GetObject are verified by canary. Other S3 operations are not verified.
4. **CDN**  
   The CDN host serves objects from published buckets. It does not front app compute and is not a cache or key-value store.

## Prerequisites
- A Django project that builds and starts with the documented commands (pip install into .ample/python from requirements.txt, then waitress serving project.wsgi from run.py reading PORT on the python-3.12 template).
- A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env).
- A bucket from `ample bucket create` with its credentials passed as encrypted S3_* environment variables and a second, published bucket for public assets (CDN_*).
- An Ample account token with servers:write, databases:read, buckets:read.

## Workflow Steps
1. **Build and Start**  
   pip install into .ample/python from requirements.txt, then waitress serving project.wsgi from run.py reading PORT on the python-3.12 template. The server must bind 0.0.0.0 on PORT.
2. **Implement the Pattern on PostgreSQL**  
   The fixture's module implements public media library: an object written to a published bucket with an immutable Cache-Control header, a mapping row, and the CDN URL serving it publicly. Copy the approach into your schema; keep migrations idempotent and run them with --release-command.
3. **Wire Object Storage**  
   Create the bucket(s), then pass endpoint, region, bucket and keys as --env values. Use path-style addressing. Keep private data in an unpublished bucket. Publish only the bucket that serves public assets and reference its CDN URL.
4. **Deploy**  
   Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.
   Command: `ample deploy . --name --public --start "python3 run.py" --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=... --env CDN_PUBLIC_URL=...`
5. **Verify**  
   Fetch the live URL and the pattern self-test route(s) (/p/public-media-library) from the example; then run your own checks. On failure read `ample logs --kind build` then `--kind runtime`.  
   Command: `ample logs --kind build`

## Examples
### Django Pattern Fixture
- **Description:** Multi-pattern Django app whose public media library module was checked live; the module is under tests/deploy-canaries/_pattern-modules.  
- **Source Reference:** tests/deploy-canaries/django-patterns

## Limitations
- Verified on the python-3.12 template at s-1vcpu-1gb with the example fixture; other sizes, templates and Django major versions are not verified.
- The product catalog itself (your media processing, object layout and cache policy) is application code and was not separately tested; the pattern checks are what was verified.
- Region, compliance attestations and request-duration limits are unknown and not claimed.
- Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.
- Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified; apps and their databases are placed together.
- PutObject and GetObject with path-style addressing are verified; multipart upload, listing, presigned URLs and lifecycle rules are not.
- The CDN serves published-bucket objects only; cache rules, purge and TTL control are not verified (the fixture sets Cache-Control on upload and versions keys).

## Cost Estimate
- **Currency:** USD  
- **Monthly Amount:** 10.0  
- **Basis:** size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty  
- **Components:**  
  1. app server  
     - **Size:** s-1vcpu-1gb  
     - **Quantity:** 1.0  
     - **Monthly Amount:** 5.0  
  2. managed PostgreSQL database  
     - **Size:** s-1vcpu-1gb  
     - **Quantity:** 1.0  
     - **Monthly Amount:** 5.0  
- **Note:** Always-on monthly price of the tested sizes; apps and databases auto-pause when idle. Buckets are allocation-priced per quota and not included.

## Evidence Summary
- **Kind:** canary_run  
  - **Summary:** Django pattern fixture deployed on Ample (pip install into .ample/python from requirements.txt, then waitress serving project.wsgi from run.py reading PORT on the python-3.12 template); checks passed for public-media-library and configuration-secrets. Pattern proof: an object written to a published bucket with an immutable Cache-Control header, a mapping row, and the CDN URL serving it publicly.  
  - **Observed At:** 2026-09-20T03:31:44Z
  - **Implementation Revision:** 03b6402b1b3e19178985f08ea4033804521d85d4-dirty (CLI b75e104)  
  - **Expires At:** 2027-03-19T03:31:44Z  
  - **Scope:**  
    - **Checks:** [/p/public-media-library]  
    - **Pattern:** pattern:public-media-library  
    - **Template:** python-3.12  
- **Kind:** canary_run  
  - **Summary:** The same Django app deployed with a --release-command migration; the marker it created was readable after activation.  
  - **Observed At:** 2026-09-20T01:54:51Z  
  - **Implementation Revision:** 199ff1dfd52683832ae75d3f98b53a7a4bff7f96-dirty (CLI e3181f5)  
  - **Expires At:** 2027-03-19T01:54:51Z  
  - **Scope:**  
    - **Pattern:** pattern:public-media-library

## Next Actions
- **Action ID:** browse-catalog  
  - **Label:** Browse the catalog index  
  - **Operation ID:** catalog_index  
  - **Method:** GET  
  - **Relative Path:** /v1/catalog  
  - **Origin:** api  
  - **Parameters:** {}  
  - **Requires Authentication:** false  
  - **Requires Approval:** false  
- **Action ID:** search-recipes  
  - **Label:** Search published recipes by intent, stack and constraints  
  - **Operation ID:** search_recipes  
  - **Method:** POST  
  - **Relative Path:** /v1/catalog/search  
  - **Origin:** api  
  - **Parameters:** {"body":{"limit":5,"query":"Host product catalog with Django: public product media"}}  
  - **Requires Authentication:** false  
  - **Requires Approval:** false  
- **Action ID:** plan:page:recipes:product-catalog:django:product-media  
  - **Label:** Prepare a side-effect-free deployment plan for an authorized project  
  - **Operation ID:** plan_deployment  
  - **Method:** POST  
  - **Relative Path:** /v1/catalog/plan  
  - **Origin:** api  
  - **Parameters:** {"body":{"inputs":{},"projectId":"","recipeId":"page:recipes:product-catalog:django:product-media","recipeRevision":"r1"}}  
  - **Requires Authentication:** true  
  - **Requires Approval:** false  
- **Action ID:** auth-setup  
  - **Label:** Read the existing agent authentication setup  
  - **Operation ID:** existing_auth_setup  
  - **Method:** GET  
  - **Relative Path:** /mcp/setup  
  - **Origin:** api  
  - **Parameters:** {}  
  - **Requires Authentication:** false  
  - **Requires Approval:** false  
- **Action ID:** browse:workload:product-catalog  
  - **Label:** Browse Product catalog  
  - **Operation ID:** browse_node  
  - **Method:** GET  
  - **Relative Path:** /v1/catalog/nodes/workload%3Aproduct-catalog  
  - **Origin:** api  
  - **Parameters:** {"nodeId":"workload:product-catalog"}  
  - **Requires Authentication:** false  
  - **Requires Approval:** false  
- **Action ID:** browse:stack:framework-django  
  - **Label:** Browse Django  
  - **Operation ID:** browse_node  
  - **Method:** GET  
  - **Relative Path:** /v1/catalog/nodes/stack%3Aframework-django  
  - **Origin:** api  
  - **Parameters:** {"nodeId":"stack:framework-django"}  
  - **Requires Authentication:** false  
  - **Requires Approval:** false  
- **Action ID:** browse:pattern:public-media-library  
  - **Label:** Browse Public media library  
  - **Operation ID:** browse_node  
  - **Method:** GET  
  - **Relative Path:** /v1/catalog/nodes/pattern%3Apublic-media-library  
  - **Origin:** api  
  - **Parameters:** {"nodeId":"pattern:public-media-library"}  
  - **Requires Authentication:** false  
  - **Requires Approval:** false  
- **Action ID:** browse:intent:deploy-web-app  
  - **Label:** Browse Deploy web app  
  - **Operation ID:** browse_node  
  - **Method:** GET  
  - **Relative Path:** /v1/catalog/nodes/intent%3Adeploy-web-app  
  - **Origin:** api  
  - **Parameters:** {"nodeId":"intent:deploy-web-app"}  
  - **Requires Authentication:** false  
  - **Requires Approval:** false