Upgrade Sonyflake to v2 (#66)

* Add v2

* Introduce staticcheck

* Introduce golangci-lint

* Add error checks

* Add error checks

* Lint v2 code

* Improve CI trigger

* Use io.ReadAll

* Use int64

* Remove NewSonyflake

* Fix errors

* v2: Change MachineID, sequence, and AmazonEC2MachineID to int; update all usage and tests for type consistency

* docs: update Settings struct in README to use int for MachineID and CheckMachineID (v2)

* docs(v2): clarify Settings, StartTime, MachineID, and CheckMachineID comments and update README links and explanations

* docs(v2/mock): improve comments and docstrings for mock implementations

* docs(types): unify and clarify package and type docstrings for types.go in v1 and v2

* test(v2): refactor and modernize tests, improve error assertions, and update mocks for v2

* test(v2): normalize whitespace in pseudoSleep calls for consistency

* feat(v2): add configurable TimeUnit and refactor time handling for So… (#67)

* feat(v2): add configurable TimeUnit and refactor time handling for Sonyflake v2

* test(v2): add ToTime tests, clarify TimeUnit behavior, and update docs for v2

* gofmt

v2/example/Dockerfile

@@ -0,0 +1,6 @@
+FROM ubuntu:24.04
+
+ADD ./sonyflake_server /
+ENTRYPOINT ["/sonyflake_server"]
+
+EXPOSE 8080

v2/example/Dockerrun.aws.json

@@ -0,0 +1,8 @@
+{
+  "AWSEBDockerrunVersion": "1",
+  "Ports": [
+    {
+      "ContainerPort": "8080"
+    }
+  ]
+}

v2/example/README.md

@@ -0,0 +1,21 @@
+Example
+=======
+
+This example runs Sonyflake on AWS Elastic Beanstalk.
+
+Setup
+-----
+
+1. Build the cross compiler for linux/amd64 if using other platforms.
+
+  ```
+  cd $GOROOT/src && GOOS=linux GOARCH=amd64 ./make.bash
+  ```
+
+2. Build sonyflake_server in the example directory.
+
+  ```
+  ./linux64_build.sh
+  ```
+
+3. Upload the example directory to AWS Elastic Beanstalk.

v2/example/linux64_build.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+GOOS=linux GOARCH=amd64 go build sonyflake_server.go

v2/example/sonyflake_server.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/sony/sonyflake/v2"
+	"github.com/sony/sonyflake/v2/awsutil"
+)
+
+var sf *sonyflake.Sonyflake
+
+func init() {
+	var st sonyflake.Settings
+	st.MachineID = awsutil.AmazonEC2MachineID
+
+	var err error
+	sf, err = sonyflake.New(st)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func handler(w http.ResponseWriter, r *http.Request) {
+	id, err := sf.NextID()
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	body, err := json.Marshal(sonyflake.Decompose(id))
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header()["Content-Type"] = []string{"application/json; charset=utf-8"}
+	_, err = w.Write(body)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+func main() {
+	http.HandleFunc("/", handler)
+	err := http.ListenAndServe(":8080", nil)
+	if err != nil {
+		panic(err)
+	}
+}