# Use base golang image from Docker Hub
FROM golang:1.12.7

# Download the dlv (delve) debugger for go (you can comment this out if unused)
RUN go get -u -v github.com/go-delve/delve/cmd/dlv

WORKDIR /src/prom-kafka-writer

RUN mkdir /librdkafka-dir && cd /librdkafka-dir
RUN git clone https://github.com/edenhill/librdkafka.git && \ 
cd librdkafka && \
./configure --prefix /usr && \
make && \
make install

# Install dependencies in go.mod and go.sum
COPY go.mod go.sum ./
RUN go mod download

# Copy rest of the application source code
COPY . ./

# Compile the application to /app.
RUN go build -o ./bin/prom-kafka-writer -v ./cmd/prom-kafka-writer

# If you want to use the debugger, you need to modify the entrypoint to the
# container and point it to the "dlv debug" command:
#   * UNCOMMENT the following ENTRYPOINT statement,
#   * COMMENT OUT the last ENTRYPOINT statement
# Start the "dlv debug" server on port 3000 of the container.
ENTRYPOINT ["dlv", "exec", "./bin/prom-kafka-writer", "--continue", "--accept-multiclient", "--api-version=2", "--headless", "--listen=:3000", "--log"]

# If you want to run WITHOUT the debugging server:
#   * COMMENT OUT the previous ENTRYPOINT statements,
#   * UNCOMMENT the following ENTRYPOINT statement.
# ENTRYPOINT ["/prom-kafka-writer"]