Merge pull request #2 from qedgardo/feat/custom-port

Feat: custom port

Makefile

@@ -0,0 +1,37 @@
+# Binary name
+BINARY_NAME=aptos-metrics-exporter
+# Compressed binary name
+COMPRESSED_NAME=ame-linux-amd64
+# Output directories
+BUILD_DIR=build
+BIN_DIR=$(BUILD_DIR)/bin
+
+# Commands
+GO_BUILD=go build
+GO_GET=go get
+TAR=tar
+GZIP=gzip
+
+# Install required Go dependencies
+.PHONY: deps
+deps:
+	@echo "Installing dependencies..."
+	$(GO_GET) github.com/prometheus/client_golang/prometheus
+	$(GO_GET) github.com/prometheus/client_golang/prometheus/promhttp
+
+# Build binary for Linux amd64
+.PHONY: build
+build: deps
+	@echo "Building the binary for Linux amd64..."
+	mkdir -p $(BIN_DIR)
+	GOOS=linux GOARCH=amd64 $(GO_BUILD) -o $(BIN_DIR)/$(BINARY_NAME) ./cmd/$(BINARY_NAME)
+
+# Compress the binary with gzip
+.PHONY: compress-gzip
+compress-gzip: build
+	@echo "Compressing the binary with gzip..."
+	$(TAR) -cvzf $(BUILD_DIR)/$(COMPRESSED_NAME).tar.gz -C $(BIN_DIR) $(BINARY_NAME)
+
+# Default target (build)
+.PHONY: all
+all: build

README.md

@@ -20,11 +20,9 @@ By default, the exporter will fetch the block height in `http://localhost:8080/v
 2. **Build the binary**:
 
     ```bash
-    go get github.com/prometheus/client_golang/prometheus
-    go get github.com/prometheus/client_golang/prometheus/promhttp
-    go build -o aptos-metrics-exporter ./cmd/aptos-metrics-exporter
+    make build
     ```
-
+    You can find the built binary in the `build/bin` directory.
 3. **Run the exporter**:
 
     After building the binary, run it:
@@ -33,6 +31,11 @@ By default, the exporter will fetch the block height in `http://localhost:8080/v
     ./aptos-metrics-exporter
     ```
 
+    You can specify a different port by adding the `-p` flag followed by the desired port number. For example, to run the exporter on port `9090`:
+    ```bash
+    ./aptos-metrics-exporter -p 9090
+    ```
+
 4. **Prometheus Configuration**:
 
     Add the following scrape job to your Prometheus configuration (`prometheus.yml`):

cmd/aptos-metrics-exporter/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"flag"
+	"fmt"
 	"log"
 	"net/http"
 	"time"
@@ -10,6 +12,12 @@ import (
 )
 
 func main() {
+	// -p flag for the server port. Default value: 2112
+	var port int
+
+	flag.IntVar(&port, "p", 2112, "Server port")
+	flag.Parse()
+
 	// Set up the HTTP handler for Prometheus metrics
 	http.Handle("/metrics", promhttp.Handler())
 
@@ -24,9 +32,10 @@ func main() {
 	// Fetch the block height initially to set the initial value before scraping starts
 	collector.FetchLatestBlockHeight()
 
+	address := fmt.Sprintf(":%d", port)
 	// Start the HTTP server
-	log.Println("Starting server on :2112")
-	if err := http.ListenAndServe(":2112", nil); err != nil {
+	log.Printf("Starting server on %s", address)
+	if err := http.ListenAndServe(address, nil); err != nil {
 		log.Fatal("ListenAndServe: ", err)
 	}
 }