Add examples (#3)

README.md

@@ -90,12 +90,14 @@ import (
 
 func main() {
 	var fact struct {
-		Fact string `json:"fact"`
+		Data []struct {
+			Fact string `json:"fact"`
+		} `json:"data"`
 	}
 	client := chttp.NewJSON(nil) // same as chttp.NewClient(nil).JSON()
 	_ = client.GET(context.TODO(), "https://catfact.ninja/facts?limit=1&max_length=140", nil, &fact)
 
-	fmt.Println(fact.Fact)
+	fmt.Println(fact.Data[0].Fact)
 }
 ```
 
@@ -127,7 +129,9 @@ import (
 
 func main() {
 	var fact struct {
-		Fact string `json:"fact"`
+		Data []struct {
+			Fact string `json:"fact"`
+		} `json:"data"`
 	}
 	client := chttp.NewJSON(nil)
 	client.With(middleware.JSON(), middleware.Debug(true, nil))
@@ -139,7 +143,7 @@ func main() {
 	})
 	_ = client.GET(context.TODO(), "https://catfact.ninja/facts?limit=1&max_length=140", nil, &fact)
 
-	fmt.Println(fact.Fact)
+	fmt.Println(fact.Data[0].Fact)
 }
 ```
 

client_test.go

@@ -6,10 +6,12 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"log"
 	"net/http"
 	"net/http/httptest"
 	"reflect"
 	"testing"
+	"time"
 )
 
 func TestClient_Method(t *testing.T) {
@@ -229,7 +231,14 @@ func equalResponses(t *testing.T, actual *http.Response, wantBody []byte, status
 }
 
 func ExampleNewClient() {
-	client := NewClient(nil)
+	client := NewClient(&http.Client{Timeout: 30 * time.Second})
+	client.With(func(request *http.Request, next func(request *http.Request) (*http.Response, error)) (*http.Response, error) {
+		log.Printf("before request: %s %s", request.Method, request.URL.String())
+		response, err := next(request)
+		log.Printf("after  request: %s %s", request.Method, request.URL.String())
+		fmt.Print("from middleware -> ")
+		return response, err
+	})
 	response, err := client.HEAD(context.TODO(), "https://go.dev/")
 	if err != nil {
 		panic(err)
@@ -239,5 +248,5 @@ func ExampleNewClient() {
 	}()
 
 	fmt.Printf("status: %d", response.StatusCode)
-	// Output: status: 200
+	// Output: from middleware -> status: 200
 }

json_test.go

@@ -196,3 +196,19 @@ func TestJSONClient_Request_status(t *testing.T) {
 		t.Errorf("Request() wrong error: %q", err.Error())
 	}
 }
+
+func ExampleJSONClient_GET() {
+	var fact struct {
+		Data []struct {
+			Fact string `json:"fact"`
+		} `json:"data"`
+	}
+	client := NewJSON(nil)
+	client.With(func(request *http.Request, next func(request *http.Request) (*http.Response, error)) (*http.Response, error) {
+		request.Header.Set("Content-Type", "application/json")
+		request.Header.Set("Accept", "application/json")
+		return next(request)
+	})
+	_ = client.GET(context.TODO(), "https://catfact.ninja/facts?limit=1&max_length=140", nil, &fact)
+	fmt.Println(fact.Data[0].Fact)
+}

middleware/README.md

@@ -1,5 +1,23 @@
 # Middlewares
 
+Middleware can be created with the defining function:
+
+```go
+func(request *http.Request, next func(request *http.Request) (*http.Response, error)) (*http.Response, error)
+```
+
+**Example:**
+
+```go
+client := chttp.NewClient(nil)
+client.With(func(request *http.Request, next func(request *http.Request) (*http.Response, error)) (*http.Response, error) {
+    // before action
+    response, err := next(request)
+    // before action
+    return response, err
+})
+```
+
 ## CustomHeaders
 
 Adds a custom headers based on the request.
@@ -55,6 +73,22 @@ client := chttp.NewClient(nil)
 client.With(middleware.JSON())
 ```
 
+## OpenTracing
+
+Adds an OpenTracing logs and headers to the request.
+
+Source: [https://github.com/spyzhov/chttp-middleware-opentracing](https://github.com/spyzhov/chttp-middleware-opentracing)
+
+```go
+import (
+	// ...
+	middleware "github.com/spyzhov/chttp-middleware-opentracing"
+)
+
+client := chttp.NewClient(nil)
+client.With(middleware.Opentracing())
+```
+
 ## Trace
 
 Adds short logs on each request.
@@ -65,3 +99,21 @@ Adds short logs on each request.
 client := chttp.NewClient(nil)
 client.With(middleware.Trace(nil))
 ```
+
+# TBD
+
+ - [ ] `Cache(interface{Get(string,interface{}), Set(string,interface{})}, GetKey func(*http.Request) string)`
+
+   Client-wide caching layer.
+
+   If `GetKey` return a blank string, then do not cache.
+ - [ ] `Retry(GetCount func(*http.Request) int, BeforeRetry func (*http.Request, int) string)`
+
+   Automatically send a retry request in case of failure.
+
+   `GetCount` - returns the max retry amount. 
+
+   `BeforeRetry` - should be called before retry.
+
+   **TODO**: think about a structure as argument
+   `struct {GetCount func(*http.Request) int, BeforeRetry func (*http.Request, int) string}`