feat(asb): allow config overrides from env vars

[delta1]

• upgrades config crate to 0.13.2 build(deps): bump config from 0.11.0 to 0.13.2 #1087
• adds environment source for config overrides

This change allows the ASB config to be overridden by env vars starting with ASB__.
Adds a test to check this, and updates the de/serialization of the network listen and external_addresses fields to be a comma separated string from the environment. The separator is a pair of underscores, which is necessary since some of the fields already have underscores in their names.

Example env var: ASB__NETWORK__EXTERNAL_ADDRESSES="/dns4/example.org/tcp/9939,/ip4/1.2.3.4/tcp/9940"

This particular change will help when running the ASB as a docker container (wip), allowing the config to be set in the env for docker-compose etc.

[binarybaron]

Code lgtm but I'll try it out myself later.

Also if you are trying to create a docker image for the asb perhaps you can use the image I'm currently using as a starting point.

FROM rust:1.59-slim AS builder

WORKDIR /build

RUN apt-get update
RUN apt-get install -y git clang cmake libsnappy-dev

RUN git clone https://github.com/comit-network/xmr-btc-swap .

RUN cargo build --release --bin=asb

FROM debian:bullseye-slim

WORKDIR /data

COPY --from=builder /build/target/release/asb /bin/asb

# Expose listen address
EXPOSE 9939 9940

ENTRYPOINT ["asb"]

[delta1]

Cheers @binarybaron just finishing this up. Thanks for the dockerfile will compare with the one I have from much earlier this year 😅

[delta1]

bors r+

[bors]

Build succeeded:

• bdk_test
• build (armv7-unknown-linux-gnueabihf, ubuntu-latest)
• build (x86_64-apple-darwin, macos-latest)
• build (x86_64-pc-windows-msvc, windows-latest)
• build (x86_64-unknown-linux-gnu, ubuntu-latest)
• docker_tests (alice_and_bob_refund_using_cancel_and_refund_command)
• docker_tests (alice_and_bob_refund_using_cancel_and_refund_command_timelock_not_expired)
• docker_tests (alice_manually_punishes_after_bob_dead)
• docker_tests (alice_manually_redeems_after_enc_sig_learned)
• docker_tests (alice_punishes_after_restart_bob_dead)
• docker_tests (alice_refunds_after_restart_bob_refunded)
• docker_tests (concurrent_bobs_before_xmr_lock_proof_sent)
• docker_tests (ensure_same_swap_id)
• docker_tests (happy_path)
• docker_tests (happy_path_restart_alice_after_xmr_locked)
• docker_tests (happy_path_restart_bob_after_xmr_locked)
• docker_tests (happy_path_restart_bob_before_xmr_locked)
• docker_tests (punish)
• sqlx_test
• static_analysis
• test (macos-latest)
• test (ubuntu-latest)