ACH Server Media Import

This repository contains a script that imports media files from an S3-compatible bucket into a PostgreSQL database. It supports both local execution (Python virtual environment) and Docker deployment via docker-compose.

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Overview

Asset hierarchy

• Conservatory Copy (Master): High-quality source (e.g., .mov, .wav). This is the primary record in the database.
• Streaming Copy (Derivative): Transcoded versions (.mp4, .mp3) linked to the master.
• Sidecar Metadata (.json): Contains technical metadata (mediainfo / ffprobe) used for validation and to determine the correct MIME type.
• Sidecar QC (.pdf, .md5): Quality control and checksum files.

Important: all files belonging to the same asset must share the same 12-character inventory code (e.g., VO-UMT-14387).

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Process Phases

The importer runs in three clearly separated phases (each phase is logged in detail):

Phase 1 – S3 discovery + initial validation

• List objects in the configured S3 bucket.
• Keep only allowed extensions: .mp4, .mp3, .json, .pdf, .md5.
• Exclude configured folders (e.g., TEST-FOLDER-DEV/, DOCUMENTAZIONE_FOTOGRAFICA/, UMT/).
• Validate the inventory code format and ensure the folder prefix matches the type encoded in the inventory code.
• Files failing validation are rejected before any database interaction.

Phase 2 – Database cross-reference + filtering

• Load existing filenames from the database.
• Skip files already represented in the DB, including sidecar records.
• Build the final list of S3 objects to parse.

Phase 3 – Parse & insert

• Read and validate sidecars (.json, .md5, .pdf) alongside the media file.
• Use metadata (from mediainfo / ffprobe) to derive the master mime type and enforce container rules.
• Insert new records into the database (unless ACH_DRY_RUN=true).

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Validation Policy

The import pipeline enforces strict validation to prevent bad data from entering the database.

Inventory Code & Folder Prefix

• Expected inventory code format: ^[VA][OC]-[A-Z0-9]{3}-\d{5}$.
• The folder prefix (e.g., BRD/, DVD/, FILE/) must match the code type.
• If the prefix does not match the inventory code, the file is rejected in Phase 1.

Safe Run (ACH_SAFE_RUN)

• When ACH_SAFE_RUN=true, any warning during Phase 3 causes an immediate abort.
• This prevents partial inserts when the importer detects inconsistent or already-present data.

MIME Type Determination

• The MIME type for master files is derived from the JSON sidecar metadata (mediainfo / ffprobe), not from the streaming derivative extension.

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Quick Start (Local)

Prerequisites

• Python 3.8+
• Virtual environment support (venv)

Setup

python3 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

Run

python main.py

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Docker (docker-compose)

The project includes a docker-compose.yml with an app service (container name ACH_server_media_importer). It reads environment variables from .env and mounts a logs volume.

Build & run

docker compose up -d --build

Logs

docker compose logs -f app

Stop

docker compose stop

Rebuild (clean)

docker compose down --volumes --rmi local
docker compose up -d --build

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Configuration

Configuration is driven by .env and config.py. Key variables include:

• AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_REGION, BUCKET_NAME
• DB_HOST, DB_NAME, DB_USER, DB_PASSWORD, DB_PORT
• ACH_DRY_RUN (true / false)
• ACH_SAFE_RUN (true / false)

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Troubleshooting

• If Docker does not pick up changes, ensure docker compose up -d --build is run from the repo root.
• Inspect runtime errors via docker compose logs -f app.