fix data persistence option in docker

Dockerfile

@@ -1,19 +1,23 @@
-FROM lukemathwalker/cargo-chef:latest-rust-1 AS chef
+FROM lukemathwalker/cargo-chef:latest-rust-1-slim-buster AS chef
 WORKDIR /app/
-RUN apt update && apt install -y libssl-dev
+RUN apt update && apt install -y libssl-dev pkg-config
 
 FROM chef AS planner
+
 COPY src ./src
 COPY Cargo.toml .
 COPY Cargo.lock .
+
 RUN cargo chef prepare --recipe-path recipe.json
 
 FROM chef AS builder
 COPY --from=planner /app/recipe.json recipe.json
 RUN cargo chef cook --release --recipe-path recipe.json
+
 COPY src ./src
 COPY Cargo.toml .
 COPY Cargo.lock .
+
 RUN cargo build --release
 
 FROM debian:buster-slim

README.md

@@ -7,6 +7,8 @@ Multiple endpoints/chains can be configured to be cached.
 docker run \
   -d \
   -p 8124:8124 \
+  -v ./data/:/data/ \
+  -e DATA_PERSISTENCE=1 \
   -e ENDPOINTS="eth-chain=https://rpc.ankr.com/eth,bsc-chain=https://rpc.ankr.com/bsc" \
   --name cached-eth-rpc \
   ghcr.io/tonyke-bot/cached-eth-rpc

docker-entrypoint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 IFS=',' read -ra PARTS <<< "$ENDPOINTS"
 ARGUMENTS=""
@@ -7,4 +7,9 @@ for part in "${PARTS[@]}"; do
   ARGUMENTS+="--endpoint $part "
 done
 
-$1 --port 8124 --bind 0.0.0.0 $ARGUMENTS
+# if DATA_PERSISTENCE = 1 is set, then use it
+if [ "$DATA_PERSISTENCE" = "1" ]; then
+  ARGUMENTS+="--datadir /data"
+fi
+
+exec $1 --port 8124 --bind 0.0.0.0 $ARGUMENTS

src/cli.rs

@@ -8,11 +8,9 @@ pub struct Cli {
     #[arg(short, long, default_value = "127.0.0.1")]
     pub bind: String,
 
-    /// Name of the person to greet
     #[arg(short, long, default_value = "8124")]
     pub port: u16,
 
-    /// Number of times to greet
     #[arg(short, long = "endpoint", value_parser = endpoint_parser)]
     pub endpoints: Vec<(String, Url)>,