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# HTTP Protocol endpoints
All endpoints use JSON documents. The contents of these documents can be found
in `flamenco/documents.go`.
## Exposed to Flamenco Worker
There are a few standard responses (`404 Not Found` for task updates on a
non-existant task ID, for example) that are not covered here.
### Authentication
Workers register themselves with a random secret at the `/register-worker`
endpoint. The Manager will respond with the worker information, including its
ID. Subsequent calls must then include a Basic HTTP authorization header with
the worker ID as username and the random secret as password.
### `/register-worker`
Expects a `POST` with a `WorkerRegistration` document.
Returns `Worker` document, which contains a field `_id` to be used as username
in authenticated calls.
Allows workers to register themselves with a nickname, secret (used to
authenticate subsequent calls), supported task types, and more info.
### `/sign-on`
Expects an authenticated `POST` with a `WorkerSignonDoc` document.
This gives the worker the possibility to change its nickname and supported task
types, without having to re-register. It also marks the worker status as
`starting`.
### `/sign-off`
Expects an authenticated `POST`. Re-queues any task that was assigned to the
worker, so that they can be assigned to a different worker.
### `/task`
Expects an authenticated `GET`.
Can return different responses with different HTTP status codes:
- `200 OK`: Indicates the worker should execute a task. Returns a `Task`
document.
- `204 No Content`: Indicates that there are no tasks to perform at this moment.
- `406 Not Acceptable`: Indicates that the worker has no supported tasks types.
- `423 Locked`: Indicates that the worker should not perform a task at this
moment, but rather change its status. Returns a `WorkerStatus` document with
the requested status.
### `/tasks/{task-id}/update`
Expects an authenticated `POST` with a `TaskUpdate` document.
Can return different responses with different HTTP status codes:
- `204 No Content`: The update was accepted.
- `409 Conflict`: The task is assigned to another worker, so the update was not
accepted.
### `/logfile/{job-id}/{task-id}`
Expects a `GET`.
Serves the latest log file for that task. Rotated log files cannot be accessed
via any URL.
### `/may-i-run/{task-id}`
Expectes an authenticated `GET`.
Returns a `MayKeepRunningResponse` document indicating whether the worker is
allowed to run / keep running the task, and possibly any queued requested worker
status change.
### `/status-change`
Expectes an authenticated `GET`.
Can return different responses with different HTTP status codes:
- `200 OK`: Returns a `WorkerStatus` document with the status to change to.
- `204 No Content`: No status change is queued for the worker.
### `/ack-status-change/{ack-status}`
Expectes an authenticated `POST`. The URL should contain the status that is
being acknowledged (or otherwise changed to). Acknowledging a status that wasn't
queued as status change for the worker is accepted, but will trigger a warning
in the Manager's log.
Returns a `204 No Content`.
### `/output-produced`
Expects an authenticated `POST` with a `FileProduced` document.
This is used by workers to indicate to the Manager that an image was produced
that should be shown as 'latest image' in the dashboard.
- `204 No Content`: The update was accepted. Note that this does not ensure
display on the dashboard; when the queue of images to show is too large, new
updates will be dropped and a warning logged.
- `422 Unprocessable Entity`: The request did not contain any image paths.
## Shaman endpoints
These endpoints are exposed by the Shaman server, integrated in Flamenco Manager.
Checksums are always SHA256 sums.
### `/files/{checksum}/{filesize}`
Expects a JWT-authenticated `POST` or `OPTIONS`.
The `POST` request allows a client to upload a new file to the file store.
The following headers can be included:
- `X-Shaman-Original-Filename`: purely used for logging the original filename
in the server logs. Can be used to trace who uploaded which file with which
checksum.
- `X-Shaman-Can-Defer-Upload`: when set to `true` the Shaman will send a
`208 Already Reported` response and close the connection, without waiting for
the request body to be uploaded completely, when someone else is currently
uploading a file with the same checksum and the same filesize.
When someone else finishes uploading a file with the same checksum and the same
filesize, the Shaman will send a `208 Already Reported` response and close the
connection, without waiting for the request body to be uploaded completely.
The `OPTIONS` request will return one of the following statuses:
- `420 Enhance Your Calm`: someone is currently uploading this file.
- `200 OK`: this file is stored.
- `404 Not Found`: this file is unknown.
Use of the `OPTIONS` request is discouraged in favour of sending a Checkout
Definition File to mass-check multiple files in one request.
### `/checkout/requirements` and `/checkout/create/{checkoutID}`
Expect a JWT-authenticated `POST` request with `Content-Type: text/plain` and a
Checkout Definition File in the body. This file consists of a line for each file
desired in the checkout, as follows:
{SHA256-sum} {filesize in bytes} {path of the file in the checkout}
The `/checkout/requirements` endpoint will respond by repeating those lines of
the Checkout Definition File that require action by the client, prefixed with
the current status:
- `file-unknown`: the file is unknown to the server and should be uploaded.
- `already-uploading`: the file is currently being uploaded by another client.
This client can thus defer uploading this file and start with another file.
The `/checkout/create/{checkoutID}` requires that all files are known to the
Shaman, and actually creates a checkout with the given ID by symlinking the
requested files to the requested paths. The response contains the subdirectory
of the configured checkout directory that containing the requested checkout.
## Used on Flamenco Server
To be documented.