feat(example): add example

Author: wangxin688

_examples/main.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/wangxin688/gopromql"
+)
+
+func main() {
+
+	pb1 := example1()
+
+	pb2 := example2()
+
+	pb3 := example3()
+
+	pb4 := example4()
+
+	fmt.Println(pb1, pb2, pb3, pb4)
+}
+
+func example1() string {
+
+	pb, err := gopromql.NewPromqlBuilder("http_requests_total").
+		WithFuncName("last_over_time").
+		WithWindow("5m").
+		Build()
+	if err != nil {
+		panic(err)
+	}
+
+	return pb
+}
+
+func example2() string {
+
+	pb, err := gopromql.NewPromqlBuilder("http_requests_total").
+		WithFuncName("sum_over_time").
+		WithLabels(gopromql.Label{Name: "status_code", Matcher: "=", Value: "200"}).
+		WithLabels(gopromql.Label{Name: "method", Matcher: "=~", Value: "GET|POST|PUT"}).
+		WithLabels(gopromql.Label{Name: "path", Matcher: "!=", Value: "/health"}).
+		WithWindow("5m").
+		Build()
+	if err != nil {
+		panic(err)
+	}
+	return pb
+}
+
+func example3() string {
+	pb, err := gopromql.NewPromqlBuilder("http_requests_total").
+		WithFuncName("sum_over_time").
+		WithLabels(gopromql.Label{Name: "status_code", Matcher: "=", Value: "200"}).
+		WithLabels(gopromql.Label{Name: "method", Matcher: "=~", Value: "GET|POST|PUT"}).
+		WithLabels(gopromql.Label{Name: "path", Matcher: "!=", Value: "/health"}).
+		WithComp(gopromql.Compare{Op: gopromql.GreaterThan, Value: 0}).
+		WithWindow("5m").
+		Build()
+	if err != nil {
+		panic(err)
+	}
+
+	return pb
+}
+
+func example4() string {
+	pb, err := gopromql.NewPromqlBuilder("http_requests_total").
+		WithFuncName("sum_over_time").
+		WithLabels(gopromql.Label{Name: "status_code", Matcher: "=", Value: "200"}).
+		WithAgg(gopromql.Aggregation{Op: gopromql.Max, AggWay: gopromql.GroupBy, By: []string{"method", "path"}}).
+		WithWindow("5m").
+		Build()
+	if err != nil {
+		panic(err)
+	}
+	return pb
+}

go.mod

@@ -1,3 +1,3 @@
-module gopromql
+module github.com/wangxin688/gopromql
 
 go 1.22.1