feat: docker (#10)

Dockerfile

@@ -0,0 +1,46 @@
+# Start from the official Golang image to build our application.
+FROM golang:1.22 AS builder
+
+# Set the current working directory inside the container.
+WORKDIR /app
+
+# Copy go.mod and go.sum to download the dependencies.
+# This is done before copying the source code to cache the dependencies layer.
+COPY go.mod ./
+COPY go.sum ./
+
+# Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed.
+RUN go mod download
+
+# Copy the source code into the container.
+COPY . .
+
+# Build the Go app as a static binary.
+# -o specifies the output file, in this case, the executable name.
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o mfx-migrator .
+
+# Start from a Debian Slim image to keep the final image size down.
+FROM debian:buster-slim
+
+# Install cron to schedule the job.
+RUN apt-get update && apt-get install -y cron && rm -rf /var/lib/apt/lists/*
+
+# The application configuration file should be stored in /mfx-migrator
+VOLUME /mfx-migrator
+
+# The job files should be stored in /jobs
+VOLUME /jobs
+
+# Copy the pre-built binary file and script from the previous stage.
+COPY --from=builder /app/mfx-migrator /usr/local/bin/mfx-migrator
+COPY --from=builder /app/scripts/claim_and_migrate.sh /etc/cron.d/claim_and_migrate.sh
+RUN chmod +x /etc/cron.d/claim_and_migrate.sh
+
+# Add a cron job to run the script every minute.
+RUN echo "* * * * * root /etc/cron.d/claim_and_migrate.sh >> /var/log/cron.log 2>&1" >> /etc/crontab
+
+# Create a log file to store the cron job output.
+RUN touch /var/log/cron.log
+
+# Command to run the executable.
+CMD cron && tail -f /var/log/cron.log

cmd/root.go

@@ -93,7 +93,7 @@ func init() {
 	SetupRootCmdFlags(rootCmd)
 
 	viper.AddConfigPath("./")
-	viper.AddConfigPath("/mfx-migrator")
+	viper.AddConfigPath("/config")
 	viper.SetConfigName("migrator-config")
 
 	viper.AutomaticEnv()

scripts/claim_and_migrate.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+WORKDIR=/jobs
+
+cd "$WORKDIR" || exit 1
+
+# Claim some work from queue
+mfx-migrator claim
+
+# Run the migration for each JSON file in the workdir
+find . -name '*.json' ! -name "config.json" -print0 | xargs -0 -I{} -P 1 bash -c 'mfx-migrator migrate --uuid $(basename "{}" .json)'