You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

213 lines
6.1 KiB

package xhandler
import (
"net/http"
"net/http/httptest"
"testing"
"context"
"github.com/stretchr/testify/assert"
)
var testRequest, _ = http.NewRequest("GET", "/", nil)
func TestAppendHandlerC(t *testing.T) {
init := 0
h1 := func(next HandlerC) HandlerC {
init++
return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
ctx = context.WithValue(ctx, "test", 1)
next.ServeHTTPC(ctx, w, r)
})
}
h2 := func(next HandlerC) HandlerC {
return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
ctx = context.WithValue(ctx, "test", 2)
next.ServeHTTPC(ctx, w, r)
})
}
c := Chain{}
c.UseC(h1)
c.UseC(h2)
assert.Len(t, c, 2)
h := c.Handler(HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
// Test ordering
assert.Equal(t, 2, ctx.Value("test"), "second handler should overwrite first handler's context value")
}))
h.ServeHTTP(nil, testRequest)
h.ServeHTTP(nil, testRequest)
assert.Equal(t, 1, init, "handler init called once")
}
func TestAppendHandler(t *testing.T) {
init := 0
h1 := func(next HandlerC) HandlerC {
return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
ctx = context.WithValue(ctx, "test", 1)
next.ServeHTTPC(ctx, w, r)
})
}
h2 := func(next http.Handler) http.Handler {
init++
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Change r and w values
w = httptest.NewRecorder()
r = &http.Request{}
next.ServeHTTP(w, r)
})
}
c := Chain{}
c.UseC(h1)
c.Use(h2)
assert.Len(t, c, 2)
h := c.Handler(HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
// Test ordering
assert.Equal(t, 1, ctx.Value("test"),
"the first handler value should be pass through the second (non-aware) one")
// Test r and w overwrite
assert.NotNil(t, w)
assert.NotNil(t, r)
}))
h.ServeHTTP(nil, testRequest)
h.ServeHTTP(nil, testRequest)
// There's no safe way to not initialize non ctx aware handlers on each request :/
//assert.Equal(t, 1, init, "handler init called once")
}
func TestChainHandlerC(t *testing.T) {
handlerCalls := 0
h1 := func(next HandlerC) HandlerC {
return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
handlerCalls++
ctx = context.WithValue(ctx, "test", 1)
next.ServeHTTPC(ctx, w, r)
})
}
h2 := func(next HandlerC) HandlerC {
return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
handlerCalls++
ctx = context.WithValue(ctx, "test", 2)
next.ServeHTTPC(ctx, w, r)
})
}
c := Chain{}
c.UseC(h1)
c.UseC(h2)
h := c.HandlerC(HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
handlerCalls++
assert.Equal(t, 2, ctx.Value("test"),
"second handler should overwrite first handler's context value")
assert.Equal(t, 1, ctx.Value("mainCtx"),
"the mainCtx value should be pass through")
}))
mainCtx := context.WithValue(context.Background(), "mainCtx", 1)
h.ServeHTTPC(mainCtx, nil, testRequest)
assert.Equal(t, 3, handlerCalls, "all handler called once")
}
func TestAdd(t *testing.T) {
handlerCalls := 0
h1 := func(next HandlerC) HandlerC {
return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
handlerCalls++
ctx = context.WithValue(ctx, "test", 1)
next.ServeHTTPC(ctx, w, r)
})
}
h2 := func(next http.Handler) http.Handler {
handlerCalls++
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Change r and w values
w = httptest.NewRecorder()
r = &http.Request{}
next.ServeHTTP(w, r)
})
}
h3 := func(next HandlerC) HandlerC {
return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
handlerCalls++
ctx = context.WithValue(ctx, "test", 2)
next.ServeHTTPC(ctx, w, r)
})
}
c := Chain{}
c.Add(h1, h2, h3)
h := c.HandlerC(HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
handlerCalls++
assert.Equal(t, 2, ctx.Value("test"),
"third handler should overwrite first handler's context value")
assert.Equal(t, 1, ctx.Value("mainCtx"),
"the mainCtx value should be pass through")
}))
mainCtx := context.WithValue(context.Background(), "mainCtx", 1)
h.ServeHTTPC(mainCtx, nil, testRequest)
assert.Equal(t, 4, handlerCalls, "all handler called once")
}
func TestWith(t *testing.T) {
handlerCalls := 0
h1 := func(next HandlerC) HandlerC {
return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
handlerCalls++
ctx = context.WithValue(ctx, "test", 1)
next.ServeHTTPC(ctx, w, r)
})
}
h2 := func(next http.Handler) http.Handler {
handlerCalls++
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Change r and w values
w = httptest.NewRecorder()
r = &http.Request{}
next.ServeHTTP(w, r)
})
}
h3 := func(next HandlerC) HandlerC {
return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
handlerCalls++
ctx = context.WithValue(ctx, "test", 2)
next.ServeHTTPC(ctx, w, r)
})
}
c := Chain{}
c.Add(h1)
d := c.With(h2, h3)
h := c.HandlerC(HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
handlerCalls++
assert.Equal(t, 1, ctx.Value("test"),
"third handler should not overwrite the first handler's context value")
assert.Equal(t, 1, ctx.Value("mainCtx"),
"the mainCtx value should be pass through")
}))
i := d.HandlerC(HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
handlerCalls++
assert.Equal(t, 2, ctx.Value("test"),
"third handler should overwrite first handler's context value")
assert.Equal(t, 1, ctx.Value("mainCtx"),
"the mainCtx value should be pass through")
}))
mainCtx := context.WithValue(context.Background(), "mainCtx", 1)
h.ServeHTTPC(mainCtx, nil, testRequest)
assert.Equal(t, 2, handlerCalls, "all handlers called once")
handlerCalls = 0
i.ServeHTTPC(mainCtx, nil, testRequest)
assert.Equal(t, 4, handlerCalls, "all handler called once")
}