set up litestream replication

Dockerfile

@@ -3,7 +3,16 @@ WORKDIR /app
 COPY . .
 RUN go build -o ./bin ./cmd/...
 
+FROM ubuntu:22.04 as litestream
+WORKDIR /download
+RUN apt update -y && apt install -y wget tar
+RUN wget https://github.com/benbjohnson/litestream/releases/download/v0.3.9/litestream-v0.3.9-linux-amd64.tar.gz; \
+  tar -zxf litestream-v0.3.9-linux-amd64.tar.gz;
+
 FROM ubuntu:22.04
+WORKDIR /themis
 COPY --from=builder /app/bin/themis-server /usr/local/bin/themis-server
+COPY --from=litestream /download/litestream /usr/local/bin/litestream
+COPY --from=builder /app/start.sh ./start.sh
 RUN apt update -y; apt install -y ca-certificates; apt-get clean
-ENTRYPOINT ["themis-server", "-db=prod.db"]
+ENTRYPOINT ["./start.sh"]

cmd/themis-server/main.go

@@ -59,6 +59,8 @@ func main() {
 		log.Fatalln("fatal error: failed to create discord app:", err)
 	}
 
+	log.Printf("connected to discord: app_id=%s, guild_id=%s\n", DISCORD_APP_ID, DISCORD_GUILD_ID)
+
 	commands := []*discordgo.ApplicationCommand{
 		{
 			Name:        "ping",
@@ -298,7 +300,6 @@ func formatClaimsTable(claims []themis.Claim) string {
 func serve(address string) error {
 	http.Handle("/health", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Write([]byte("OK"))
-		w.WriteHeader(http.StatusOK)
 	}))
 
 	return http.ListenAndServe(address, nil)

fly.toml

@@ -3,11 +3,11 @@
 app = "themis"
 kill_signal = "SIGINT"
 kill_timeout = 5
-
-[processes]
-themis = "/usr/local/bin/themis-server"
+processes = []
 
 [env]
+DISCORD_APP_ID = "1014881815921705030"
+DISCORD_GUILD_ID = "1014883118764806164"
 
 [experimental]
   allowed_public_ports = []
@@ -16,7 +16,7 @@ themis = "/usr/local/bin/themis-server"
 [[services]]
   http_checks = []
   internal_port = 8080
-  processes = ["themis"]
+  processes = ["app"]
   protocol = "tcp"
   script_checks = []
   [services.concurrency]

start.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+litestream restore -o prod.db s3://themis-database-prod/prod.db
+litestream replicate -exec='themis-server -db prod.db' prod.db s3://themis-database-prod/prod.db