feat: add GetProcessInfo for system package

docs/api/packages/system.md

@@ -31,6 +31,11 @@ import (
 -   [CompareOsEnv](#CompareOsEnv)
 -   [ExecCommand](#ExecCommand)
 -   [GetOsBits](#GetOsBits)
+-   [StartProcess](#StartProcess)
+-   [StopProcess](#StopProcess)
+-   [KillProcess](#KillProcess)
+-   [GetProcessInfo](#GetProcessInfo)
+
 
 <div STYLE="page-break-after: always;"></div>
 
@@ -404,3 +409,36 @@ func main() {
     // <nil>
 }
 ```
+
+### <span id="GetProcessInfo">GetProcessInfo</span>
+
+<p>根据进程id获取进程信息。</p>
+
+<b>函数签名:</b>
+
+```go
+func GetProcessInfo(pid int) (*ProcessInfo, error)
+```
+
+<b>示例:<span style="float:right;display:inline-block">[运行](todo)</span></b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/v2/system"
+)
+
+func main() {
+    pid, err := system.StartProcess("ls", "-a")
+    if err != nil {
+        return
+    }
+
+    processInfo, err := system.GetProcessInfo(pid)
+    if err != nil {
+        return
+    }
+
+    fmt.Println(processInfo)
+}
+```

docs/en/api/packages/system.md

@@ -34,6 +34,8 @@ import (
 -   [StartProcess](#StartProcess)
 -   [StopProcess](#StopProcess)
 -   [KillProcess](#KillProcess)
+-   [GetProcessInfo](#GetProcessInfo)
+
 
 <div STYLE="page-break-after: always;"></div>
 
@@ -408,3 +410,36 @@ func main() {
     // <nil>
 }
 ```
+
+### <span id="GetProcessInfo">GetProcessInfo</span>
+
+<p>Retrieves detailed process information by pid.</p>
+
+<b>Signature:</b>
+
+```go
+func GetProcessInfo(pid int) (*ProcessInfo, error)
+```
+
+<b>Example:<span style="float:right;display:inline-block">[Run](todo)</span></b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/v2/system"
+)
+
+func main() {
+    pid, err := system.StartProcess("ls", "-a")
+    if err != nil {
+        return
+    }
+
+    processInfo, err := system.GetProcessInfo(pid)
+    if err != nil {
+        return
+    }
+
+    fmt.Println(processInfo)
+}
+```

system/os.go

@@ -6,9 +6,12 @@ package system
 
 import (
 	"bytes"
+	"fmt"
 	"os"
 	"os/exec"
 	"runtime"
+	"strconv"
+	"strings"
 	"unicode/utf8"
 
 	"github.com/duke-git/lancet/v2/validator"
@@ -166,3 +169,156 @@ func KillProcess(pid int) error {
 
 	return process.Kill()
 }
+
+// ProcessInfo contains detailed information about a process.
+type ProcessInfo struct {
+	PID                int
+	CPU                string
+	Memory             string
+	State              string
+	User               string
+	Cmd                string
+	Threads            []string
+	IOStats            string
+	StartTime          string
+	ParentPID          int
+	NetworkConnections string
+}
+
+// GetProcessInfo retrieves detailed process information by pid.
+// Play: todo
+func GetProcessInfo(pid int) (*ProcessInfo, error) {
+	var cmd *exec.Cmd
+
+	if runtime.GOOS == "windows" {
+		cmd = exec.Command("tasklist", "/FI", fmt.Sprintf("PID eq %d", pid), "/FO", "CSV", "/V")
+	} else {
+		cmd = exec.Command("ps", "-p", strconv.Itoa(pid), "-o", "pid,%cpu,%mem,state,user,comm")
+	}
+
+	output, err := cmd.Output()
+	if err != nil {
+		return nil, err
+	}
+
+	processInfo, err := parseProcessInfo(output, pid)
+	if err != nil {
+		return nil, err
+	}
+
+	if runtime.GOOS != "windows" {
+		processInfo.Threads, _ = getThreadsInfo(pid)
+		processInfo.IOStats, _ = getIOStats(pid)
+		processInfo.StartTime, _ = getProcessStartTime(pid)
+		processInfo.ParentPID, _ = getParentProcess(pid)
+		processInfo.NetworkConnections, _ = getNetworkConnections(pid)
+	}
+
+	return processInfo, nil
+}
+
+// parseProcessInfo parses the output of `ps` or `tasklist` to fill the ProcessInfo structure.
+func parseProcessInfo(output []byte, pid int) (*ProcessInfo, error) {
+	lines := strings.Split(string(output), "\n")
+
+	if len(lines) < 2 {
+		return nil, fmt.Errorf("no process found with PID %d", pid)
+	}
+
+	var processInfo ProcessInfo
+	if runtime.GOOS == "windows" {
+		fields := strings.Split(lines[1], "\",\"")
+		if len(fields) < 9 {
+			return nil, fmt.Errorf("unexpected tasklist output format")
+		}
+
+		processInfo = ProcessInfo{
+			PID:    pid,
+			CPU:    "N/A",
+			Memory: fields[4], // Memory usage in K
+			State:  fields[5],
+			User:   "N/A",
+			Cmd:    fields[8],
+		}
+	} else {
+		fields := strings.Fields(lines[1])
+		if len(fields) < 6 {
+			return nil, fmt.Errorf("unexpected ps output format")
+		}
+
+		processInfo = ProcessInfo{
+			PID:    pid,
+			CPU:    fields[1],
+			Memory: fields[2],
+			State:  fields[3],
+			User:   fields[4],
+			Cmd:    fields[5],
+		}
+	}
+
+	return &processInfo, nil
+}
+
+func getThreadsInfo(pid int) ([]string, error) {
+	cmd := exec.Command("ps", "-T", "-p", strconv.Itoa(pid))
+	output, err := cmd.Output()
+	if err != nil {
+		return nil, err
+	}
+
+	lines := strings.Split(string(output), "\n")
+
+	var threads []string
+	for _, line := range lines[1:] {
+		if strings.TrimSpace(line) != "" {
+			threads = append(threads, line)
+		}
+	}
+
+	return threads, nil
+}
+
+func getIOStats(pid int) (string, error) {
+	filePath := fmt.Sprintf("/proc/%d/io", pid)
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return "", err
+	}
+
+	return string(data), nil
+}
+
+func getProcessStartTime(pid int) (string, error) {
+	cmd := exec.Command("ps", "-p", strconv.Itoa(pid), "-o", "lstart=")
+	output, err := cmd.Output()
+	if err != nil {
+		return "", err
+	}
+
+	return strings.TrimSpace(string(output)), nil
+}
+
+func getParentProcess(pid int) (int, error) {
+	cmd := exec.Command("ps", "-o", "ppid=", "-p", strconv.Itoa(pid))
+	output, err := cmd.Output()
+	if err != nil {
+		return 0, err
+	}
+
+	ppid, err := strconv.Atoi(strings.TrimSpace(string(output)))
+	if err != nil {
+		return 0, err
+	}
+
+	return ppid, nil
+}
+
+func getNetworkConnections(pid int) (string, error) {
+	cmd := exec.Command("lsof", "-p", strconv.Itoa(pid), "-i")
+	output, err := cmd.Output()
+	if err != nil {
+		return "", err
+	}
+
+	return string(output), nil
+}

system/os_example_test.go

@@ -117,3 +117,17 @@ func ExampleKillProcess() {
 	// Output:
 	// <nil>
 }
+
+func ExampleGetProcessInfo() {
+	pid, err := StartProcess("ls", "-a")
+	if err != nil {
+		return
+	}
+
+	processInfo, err := GetProcessInfo(pid)
+	if err != nil {
+		return
+	}
+
+	fmt.Println(processInfo)
+}

system/os_test.go

@@ -4,6 +4,7 @@ import (
 	"os/exec"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/duke-git/lancet/v2/internal"
 )
@@ -125,3 +126,19 @@ func TestStopProcess(t *testing.T) {
 	err = StopProcess(pid)
 	assert.IsNil(err)
 }
+
+func TestGetProcessInfo(t *testing.T) {
+	t.Parallel()
+
+	assert := internal.NewAssert(t, "TestGetProcessInfo")
+
+	pid, err := StartProcess("ls", "-a")
+	assert.IsNil(err)
+
+	time.Sleep(1 * time.Second)
+
+	processInfo, err := GetProcessInfo(pid)
+	assert.IsNil(err)
+
+	t.Log(processInfo)
+}