First version

Makefile

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+-include .env
+export $(shell sed 's/=.*//' .env)
+
+tower:
+	cd cmd/watch_tower && go run .
+
+tower-test:
+	cd cmd/watch_tower && go run . -c config.test.yml
+
+test:
+	go test ./...
+
+lint:
+	golangci-lint run
+
+up:
+	docker-compose up -d --build watch_tower

README.md

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+# Watch Tower
+
+Watch tower is atomex module which sends client's redeem  or refund transactions.
+
+## Usage
+
+To run watch tower you should execute command
+
+```bash
+watch_tower -c config.yml
+```
+
+Watch tower has 1 argument:
+
+* `c` - config file name.
+
+
+## Private keys
+
+To set private keys you should pass environment variables to docker container or set it on OS. `ETHEREUM_PRIVATE` - for ethereum wallet and `TEZOS_PRIVATE` - for tezos wallet.
+By default `.env` file is expected in docker-compose.
+
+
+### Build
+
+You can build binary from source
+
+```bash
+cd cmd/watch_tower && go build .
+```
+
+or by docker
+
+```bash
+docker-compose up -d --build watch_tower
+
+# or
+
+make up
+```
+
+### Config
+
+Example:
+
+```yaml
+tezos:
+  node: https://rpc.tzkt.io/mainnet
+  tzkt: https://api.tzkt.io
+  contract: KT1VG2WtYdSWz5E7chTeAdDPZNy2MpP8pTfL
+  tokens:
+    - KT1EpQVwqLGSH7vMCWKJnq6Uxi851sEDbhWL
+    - KT1Ap287P1NzsnToSJdA4aqSNjPomRaHBZSr
+ethereum:
+  node: https://main-light.eth.linkpool.io/
+  wss: wss://main-light.eth.linkpool.io/ws
+  eth_address: 0xE9C251cbB4881f9e056e40135E7d3EA9A7d037df
+  erc20_address: 0xAc5881D77Db9340c94F53300736a9cf9e61fA25E
+  user_address: YOUR_WALLET_ADDRESS_HERE
+restore: true
+types:
+  - redeem
+  - refund
+```
+
+* `types` - following for `redeem` or/and `refund` (both by default)
+* `restore` - flag which is set for finding passed swaps without redeem or refund (*false* by default)
+* `retry_count_on_failed_tx` - retry count if transaction sending was failed (*0* by default)
+* `tezos` - tezos settings. Consists of:
+
+    * `node` - URL to tezos node RPC (**required**)
+    * `tzkt` - URL to TzKT API (**required**)
+    * `contract` - address of main Atomex contract in Tezos (**required**)
+    * `tokens` - list of Atomex addresses of token contracts (**required**)
+    * `min_payoff` - minimal pay off for processing in microtez (*0* by default.  Type: **string**)
+
+* `ethereum` - ethereum settings. Consists of:
+
+    * `node` - URL to ethereum node RPC (**required**)
+    * `tzkt` - URL to ethereum websocket (**required**)
+    * `eth_address` - address of ETH Atomex contract in ethereum (**required**)
+    * `erc20_address` - address of ERC20 Atomex contract in ethereum (**required**)
+    * `user_address` - user wallet address (**required**)
+    * `min_payoff` - minimal pay off for processing in wei (*0* by default. Type: **string**)
+
+
+### Architecture
+
+  Logically program consists of 2 parts: blockchain listeners and watch tower.
+  Blockchain listeners get new transactions, prepare it and send events by channels.
+  Watch tower subscribes on blockchain listeners channels and processes its events.
+  After processing watch tower send to listener Redeem or Refund command.

build/Dockerfile

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+# ---------------------------------------------------------------------
+#  The first stage container, for building the application
+# ---------------------------------------------------------------------
+FROM golang:1.15-alpine as builder
+
+ENV CGO_ENABLED=0
+ENV GO111MODULE=on
+ENV GOOS=linux
+
+RUN apk --no-cache add ca-certificates
+RUN apk add --update git
+
+RUN mkdir -p $GOPATH/src/github.com/aopoltorzhicky/watch_tower/
+
+COPY ./go.* $GOPATH/src/github.com/aopoltorzhicky/watch_tower/
+WORKDIR $GOPATH/src/github.com/aopoltorzhicky/watch_tower/
+RUN go mod download
+
+COPY cmd/watch_tower cmd/watch_tower
+COPY internal internal
+
+WORKDIR $GOPATH/src/github.com/aopoltorzhicky/watch_tower/cmd/watch_tower/
+RUN go build -a -installsuffix cgo -o /go/bin/watch_tower .
+
+# ---------------------------------------------------------------------
+#  The second stage container, for running the application
+# ---------------------------------------------------------------------
+FROM scratch
+
+WORKDIR /app/watch_tower
+ENV GOPATH=$GOPATH
+
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /go/bin/watch_tower /go/bin/watch_tower
+COPY cmd/watch_tower/config.yml /app/watch_tower/
+COPY cmd/watch_tower/abi/ /app/watch_tower/abi/
+
+ENTRYPOINT ["/go/bin/watch_tower", "-c", "config.yml"]