A very naive, simple and not so robust HTTP API responder implementation.

internal/application/api_responder.go

@@ -0,0 +1,13 @@
+package application
+
+import (
+	"context"
+
+	"go.dev.pztrn.name/metricator/internal/common"
+)
+
+func (a *Application) respond(ctx context.Context) string {
+	metricName := ctx.Value(common.ContextKeyMetric).(string)
+
+	return a.storage.Get(metricName)
+}

internal/application/application.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"sync"
 
+	"go.dev.pztrn.name/metricator/internal/common"
 	"go.dev.pztrn.name/metricator/internal/storage"
 	"go.dev.pztrn.name/metricator/internal/storage/memory"
 )
@@ -46,6 +47,11 @@ func (a *Application) GetDoneChan() chan struct{} {
 	return a.doneChan
 }
 
+// GetHandler returns HTTP requests handling function.
+func (a *Application) GetHandler() common.HTTPHandlerFunc {
+	return a.respond
+}
+
 // Initializes internal things like storage, HTTP client, etc.
 func (a *Application) initialize() {
 	a.storage, a.storageDone = memory.NewStorage(a.ctx, a.name+" storage")