[receiver/prometheusremotewrite] Add HTTP server to handler PRW reque…

…sts (#35535)

Part of
#33782

**Description:** 

This PR adds an HTTP server to the `prometheusremotewritereceiver`
component. To keep PRs small for easier reviews, the handler doesn't do
anything at the moment.

Signed-off-by: Arthur Silva Sens <[email protected]>

.chloggen/prwreceiver-httpserver.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: receiver/prometheusremotewrite
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add HTTP Server to handler Prometheus Remote Write requests
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [35535]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: Warning - The HTTP Server still doesn't do anything. It's just a placeholder for now.
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [api, user]

receiver/prometheusremotewritereceiver/config.go

@@ -5,10 +5,13 @@ package prometheusremotewritereceiver // import "github.com/open-telemetry/opent
 
 import (
 	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/config/confighttp"
 )
 
 // Config holds common fields and embedded protocol-specific configurations
-type Config struct{}
+type Config struct {
+	confighttp.ServerConfig `mapstructure:",squash"`
+}
 
 var _ component.Config = (*Config)(nil)
 

receiver/prometheusremotewritereceiver/config_test.go

@@ -0,0 +1,17 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package prometheusremotewritereceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/prometheusremotewritereceiver"
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"go.opentelemetry.io/collector/component/componenttest"
+)
+
+func TestCreateDefaultConfig(t *testing.T) {
+	cfg := createDefaultConfig()
+	assert.NotNil(t, cfg, "failed to create default config")
+	assert.NoError(t, componenttest.CheckConfigStruct(cfg))
+}

receiver/prometheusremotewritereceiver/factory.go

@@ -7,6 +7,7 @@ import (
 	"context"
 
 	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/config/confighttp"
 	"go.opentelemetry.io/collector/consumer"
 	"go.opentelemetry.io/collector/receiver"
 
@@ -22,7 +23,11 @@ func NewFactory() receiver.Factory {
 }
 
 func createDefaultConfig() component.Config {
-	return &Config{}
+	return &Config{
+		ServerConfig: confighttp.ServerConfig{
+			Endpoint: "localhost:9090",
+		},
+	}
 }
 
 // createMetrics creates a metrics receiver based on provided config.

receiver/prometheusremotewritereceiver/factory_test.go

@@ -0,0 +1,23 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package prometheusremotewritereceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/prometheusremotewritereceiver"
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"go.opentelemetry.io/collector/consumer/consumertest"
+	"go.opentelemetry.io/collector/receiver/receivertest"
+)
+
+func TestCreateMetricsReceiver(t *testing.T) {
+	factory := NewFactory()
+	cfg := factory.CreateDefaultConfig()
+	cfg.(*Config).Endpoint = "http://localhost:0"
+
+	tReceiver, err := factory.CreateMetrics(context.Background(), receivertest.NewNopSettings(), cfg, consumertest.NewNop())
+	assert.NoError(t, err)
+	assert.NotNil(t, tReceiver, "metrics receiver creation failed")
+}

receiver/prometheusremotewritereceiver/go.mod

@@ -3,29 +3,58 @@ module github.com/open-telemetry/opentelemetry-collector-contrib/receiver/promet
 go 1.22.0
 
 require (
+	github.com/stretchr/testify v1.9.0
 	go.opentelemetry.io/collector/component v0.111.0
+	go.opentelemetry.io/collector/component/componentstatus v0.111.0
+	go.opentelemetry.io/collector/config/confighttp v0.111.0
 	go.opentelemetry.io/collector/consumer v0.111.0
+	go.opentelemetry.io/collector/consumer/consumertest v0.111.0
 	go.opentelemetry.io/collector/receiver v0.111.0
-	go.uber.org/zap v1.27.0
 )
 
 require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/google/uuid v1.6.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.17.10 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rs/cors v1.11.1 // indirect
+	go.opentelemetry.io/collector/client v1.17.0 // indirect
+	go.opentelemetry.io/collector/config/configauth v0.111.0 // indirect
+	go.opentelemetry.io/collector/config/configcompression v1.17.0 // indirect
+	go.opentelemetry.io/collector/config/configopaque v1.17.0 // indirect
 	go.opentelemetry.io/collector/config/configtelemetry v0.111.0 // indirect
+	go.opentelemetry.io/collector/config/configtls v1.17.0 // indirect
+	go.opentelemetry.io/collector/config/internal v0.111.0 // indirect
+	go.opentelemetry.io/collector/consumer/consumerprofiles v0.111.0 // indirect
+	go.opentelemetry.io/collector/extension v0.111.0 // indirect
+	go.opentelemetry.io/collector/extension/auth v0.111.0 // indirect
 	go.opentelemetry.io/collector/internal/globalsignal v0.111.0 // indirect
 	go.opentelemetry.io/collector/pdata v1.17.0 // indirect
+	go.opentelemetry.io/collector/pdata/pprofile v0.111.0 // indirect
 	go.opentelemetry.io/collector/pipeline v0.111.0 // indirect
+	go.opentelemetry.io/collector/receiver/receiverprofiles v0.111.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.55.0 // indirect
 	go.opentelemetry.io/otel v1.30.0 // indirect
 	go.opentelemetry.io/otel/metric v1.30.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.30.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.30.0 // indirect
 	go.opentelemetry.io/otel/trace v1.30.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/net v0.28.0 // indirect
+	go.uber.org/zap v1.27.0 // indirect
+	golang.org/x/net v0.29.0 // indirect
 	golang.org/x/sys v0.25.0 // indirect
-	golang.org/x/text v0.17.0 // indirect
+	golang.org/x/text v0.18.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240822170219-fc7c04adadcd // indirect
 	google.golang.org/grpc v1.67.1 // indirect
 	google.golang.org/protobuf v1.34.2 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )