Ap 857 post jobs

[steve-sullivan]

• Adds POST /jobs endpoint for submitting OCR jobs
• Validates required filelist, languages, and output parameters
• Validates that filelist exists and is a file
• Queues valid jobs using the Celery run_tesseract_job task
• Returns Celery job ID, initial PENDING status, and job-status URL
• Returns 422 responses for invalid requests and 500 responses for queue failures
• Adds unit tests for validation, successful job submission, and queue failures

[jason-raitz]

@steve-sullivan When I submit a POST to the /jobs endpoint with a properly configured json, I got a 500 error response and a stack trace complaining that psycopg is not installed.

From what I can tell, the way we configure the quiabo result backend makes sqlalchemy assume that we have psycopg v3 installed.
in docker-compose.yml
QUIABO_CELERY__result_backend: ${QUIABO__CELERY__result_backend:-db+postgresql://${POSTGRES_USER:-quiabo}:${POSTGRES_PASSWORD:-quiabo}@${POSTGRES_HOST:-db}:${POSTGRES_PORT:-5432}/${POSTGRES_DB:-quiabo}}

I think the easiest fix is to change the psycopg dependency line in our pyproject.toml:
"psycopg2", -> '"psycopg[binary]",`

I did that locally, rebuilt, and then my POST's gave a proper celery response.

[anarchivist]

fwiw changing psycopg2 to psycopg[c] in the pyproject.toml is probably better (instead of psycopg[binary]) because it's already downloading the necessary dependencies to build the Python package. (that's why we're installing gcc and libpq-dev.) the reason why this is better is listed in the Psycopg 3 docs:

A “Local installation” results in a performing and maintainable library. The library will include the speed-up C module and will be linked to the system libraries (libpq, libssl…) so that system upgrade of libraries will upgrade the libraries used by Psycopg 3 too. This is the preferred way to install Psycopg for a production site.

[anarchivist]

rw+c - this looks really great! the one thing to fix is the psycopg dependency as Jason and I reference in our comments.

[jason-raitz]

rw+c; as we discussed above.