Added text stream implementation

pkg/handler/auth/endpoints.go

@@ -105,7 +105,7 @@ func (service *auth) CreateToken(w http.ResponseWriter, r *http.Request) {
 	var req TokenCreate
 
 	// Get the request
-	if err := httprequest.Read(r, &req); err != nil {
+	if err := httprequest.Body(&req, r); err != nil {
 		httpresponse.Error(w, http.StatusBadRequest, err.Error())
 		return
 	}

pkg/handler/certmanager/endpoints.go

@@ -193,7 +193,7 @@ func (service *certmanager) reqCreateCA(w http.ResponseWriter, r *http.Request)
 	var req reqCreateCA
 
 	// Get the request
-	if err := httprequest.Read(r, &req); err != nil {
+	if err := httprequest.Body(&req, r); err != nil {
 		httpresponse.Error(w, http.StatusBadRequest, err.Error())
 		return
 	}
@@ -211,7 +211,7 @@ func (service *certmanager) reqCreateCert(w http.ResponseWriter, r *http.Request
 	var req reqCreateCert
 
 	// Get the request
-	if err := httprequest.Read(r, &req); err != nil {
+	if err := httprequest.Body(&req, r); err != nil {
 		httpresponse.Error(w, http.StatusBadRequest, err.Error())
 		return
 	}

pkg/handler/nginx/endpoints.go

@@ -171,7 +171,7 @@ func (service *nginx) ReadConfig(w http.ResponseWriter, r *http.Request) {
 // Create a new configuration
 func (service *nginx) CreateConfig(w http.ResponseWriter, r *http.Request) {
 	var create responseTemplate
-	if err := httprequest.Read(r, &create); err != nil {
+	if err := httprequest.Body(&create, r); err != nil {
 		httpresponse.Error(w, http.StatusBadRequest, err.Error())
 		return
 	} else if create.Name == "" {
@@ -264,7 +264,7 @@ func (service *nginx) DeleteConfig(tmpl *folders.Template, w http.ResponseWriter
 func (service *nginx) PatchConfig(tmpl *folders.Template, w http.ResponseWriter, r *http.Request) {
 	var patch responseTemplate
 	var modified bool
-	if err := httprequest.Read(r, &patch); err != nil {
+	if err := httprequest.Body(&patch, r); err != nil {
 		httpresponse.Error(w, http.StatusBadRequest, err.Error())
 		return
 	}

pkg/httpresponse/httpresponse.go

@@ -24,10 +24,11 @@ type ErrorResponse struct {
 // GLOBALS
 
 const (
-	ContentTypeKey   = "Content-Type"
-	ContentLengthKey = "Content-Length"
-	ContentTypeJSON  = "application/json"
-	ContentTypeText  = "text/plain"
+	ContentTypeKey        = "Content-Type"
+	ContentLengthKey      = "Content-Length"
+	ContentTypeJSON       = "application/json"
+	ContentTypeText       = "text/plain"
+	ContentTypeTextStream = "text/event-stream"
 )
 
 ///////////////////////////////////////////////////////////////////////////////

pkg/httpresponse/textstream.go

@@ -0,0 +1,166 @@
+package httpresponse
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+	"sync"
+	"time"
+)
+
+///////////////////////////////////////////////////////////////////////////////
+// TYPES
+
+// TextStream implements a stream of text events
+type TextStream struct {
+	wg  sync.WaitGroup
+	w   io.Writer
+	ch  chan *textevent
+	err error
+}
+
+type textevent struct {
+	name string
+	data []any
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// GLOBALS
+
+const (
+	defaultKeepAlive = 10 * time.Second
+)
+
+var (
+	strPing    = "ping"
+	strEvent   = []byte("event: ")
+	strData    = []byte("data: ")
+	strNewline = []byte("\n")
+)
+
+///////////////////////////////////////////////////////////////////////////////
+// LIFECYCLE
+
+// Create a new text stream with mimetype text/event-stream
+// Additional header tuples can be provided as a series of key-value pairs
+func NewTextStream(w http.ResponseWriter, tuples ...string) *TextStream {
+	// Check parameters
+	if w == nil {
+		return nil
+	}
+	if len(tuples)%2 != 0 {
+		return nil
+	}
+
+	// Create a text stream
+	self := new(TextStream)
+	self.w = w
+	self.ch = make(chan *textevent)
+
+	// Set the default content type
+	w.Header().Set(ContentTypeKey, ContentTypeTextStream)
+
+	// Set additional headers
+	for i := 0; i < len(tuples); i += 2 {
+		w.Header().Set(tuples[i], tuples[i+1])
+	}
+
+	// Write the response, don't know is this is the right one
+	w.WriteHeader(http.StatusContinue)
+
+	// goroutine will write to the response writer until the channel is closed
+	self.wg.Add(1)
+	go func() {
+		defer self.wg.Done()
+
+		// Create a ticker for ping messages
+		ticker := time.NewTimer(100 * time.Millisecond)
+		defer ticker.Stop()
+
+		// Run until the channel is closed
+		for {
+			select {
+			case evt := <-self.ch:
+				if evt == nil {
+					return
+				}
+				self.emit(evt)
+			case <-ticker.C:
+				self.err = errors.Join(self.err, self.emit(&textevent{strPing, nil}))
+				ticker.Reset(defaultKeepAlive)
+			}
+		}
+	}()
+
+	// Return the textstream object
+	return self
+}
+
+// Close the text stream to stop sending ping messages
+func (s *TextStream) Close() error {
+	// Close the channel
+	close(s.ch)
+
+	// Wait for the goroutine to finish
+	s.wg.Wait()
+
+	// Return any errors
+	return s.err
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// PUBLIC METHODS
+
+// Write a text event to the stream, and one or more optional data objects
+// which are encoded as JSON
+func (s *TextStream) Write(name string, data ...any) {
+	s.ch <- &textevent{name, data}
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// PRIVATE METHODS
+
+// emit an event to the stream
+func (s *TextStream) emit(e *textevent) error {
+	var result error
+
+	// Write the event to the stream
+	if e.name != "" {
+		if err := s.write(strEvent, []byte(e.name), strNewline); err != nil {
+			return err
+		}
+	}
+
+	// Write the data to the stream
+	for _, v := range e.data {
+		if v == nil {
+			continue
+		} else if data, err := json.Marshal(v); err != nil {
+			result = errors.Join(result, err)
+		} else if err := s.write(strData, data, strNewline); err != nil {
+			result = errors.Join(result, err)
+		}
+	}
+
+	// Flush the event
+	if result == nil {
+		if err := s.write(strNewline); err != nil {
+			result = errors.Join(result, err)
+		}
+		if w, ok := s.w.(http.Flusher); ok {
+			w.Flush()
+		}
+	}
+
+	// Return any errors
+	return result
+}
+
+func (s *TextStream) write(v ...[]byte) error {
+	if _, err := s.w.Write(bytes.Join(v, nil)); err != nil {
+		return err
+	}
+	return nil
+}

pkg/httpresponse/textstream_test.go

@@ -0,0 +1,78 @@
+package httpresponse_test
+
+import (
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	// Packages
+	"github.com/mutablelogic/go-server/pkg/httpresponse"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_textstream_001(t *testing.T) {
+	assert := assert.New(t)
+
+	t.Run("New", func(t *testing.T) {
+		resp := httptest.NewRecorder()
+		ts := httpresponse.NewTextStream(resp)
+		assert.NotNil(ts)
+		t.Log(ts)
+		assert.NoError(ts.Close())
+	})
+
+	t.Run("Ping", func(t *testing.T) {
+		resp := httptest.NewRecorder()
+		ts := httpresponse.NewTextStream(resp)
+		assert.NotNil(ts)
+
+		time.Sleep(1 * time.Second)
+		assert.NoError(ts.Close())
+		assert.Equal(100, resp.Code)
+		assert.Equal("text/event-stream", resp.Header().Get("Content-Type"))
+		assert.Equal("event: ping\n\n", resp.Body.String())
+	})
+
+	t.Run("EventNoData", func(t *testing.T) {
+		resp := httptest.NewRecorder()
+		ts := httpresponse.NewTextStream(resp)
+		assert.NotNil(ts)
+
+		ts.Write("foo")
+
+		time.Sleep(1 * time.Second)
+		assert.NoError(ts.Close())
+		assert.Equal(100, resp.Code)
+		assert.Equal("text/event-stream", resp.Header().Get("Content-Type"))
+		assert.Equal("event: foo\n\n"+"event: ping\n\n", resp.Body.String())
+	})
+
+	t.Run("EventData", func(t *testing.T) {
+		resp := httptest.NewRecorder()
+		ts := httpresponse.NewTextStream(resp)
+		assert.NotNil(ts)
+
+		ts.Write("foo", "bar")
+
+		time.Sleep(1 * time.Second)
+		assert.NoError(ts.Close())
+		assert.Equal(100, resp.Code)
+		assert.Equal("text/event-stream", resp.Header().Get("Content-Type"))
+		assert.Equal("event: foo\n"+"data: \"bar\"\n\n"+"event: ping\n\n", resp.Body.String())
+	})
+
+	t.Run("EventDataData", func(t *testing.T) {
+		resp := httptest.NewRecorder()
+		ts := httpresponse.NewTextStream(resp)
+		assert.NotNil(ts)
+
+		ts.Write("foo", "bar1", "bar2")
+
+		time.Sleep(1 * time.Second)
+		assert.NoError(ts.Close())
+		assert.Equal(100, resp.Code)
+		assert.Equal("text/event-stream", resp.Header().Get("Content-Type"))
+		assert.Equal("event: foo\n"+"data: \"bar1\"\n"+"data: \"bar2\"\n\n"+"event: ping\n\n", resp.Body.String())
+	})
+
+}