go.d: set User-Agent automatically when creating HTTP req (#17286)

packaging/cmake/Modules/NetdataGoTools.cmake

@@ -5,9 +5,9 @@
 # SPDX-License-Identifier: GPL
 
 if(CMAKE_BUILD_TYPE STREQUAL Debug OR CMAKE_BUILD_TYPE STREQUAL RelWithDebInfo)
-    set(GO_LDFLAGS "-X main.version=${NETDATA_VERSION}")
+    set(GO_LDFLAGS "-X github.com/netdata/netdata/go/go.d.plugin/pkg/buildinfo.Version=${NETDATA_VERSION}")
 else()
-    set(GO_LDFLAGS "-w -s -X main.version=${NETDATA_VERSION}")
+    set(GO_LDFLAGS "-w -s -X github.com/netdata/netdata/go/go.d.plugin/pkg/buildinfo.Version=${NETDATA_VERSION}")
 endif()
 
 # add_go_target: Add a new target that needs to be built using the Go toolchain.

src/go/collectors/go.d.plugin/cmd/godplugin/main.go

@@ -15,6 +15,7 @@ import (
 	"github.com/netdata/netdata/go/go.d.plugin/agent/executable"
 	"github.com/netdata/netdata/go/go.d.plugin/cli"
 	"github.com/netdata/netdata/go/go.d.plugin/logger"
+	"github.com/netdata/netdata/go/go.d.plugin/pkg/buildinfo"
 	"github.com/netdata/netdata/go/go.d.plugin/pkg/multipath"
 
 	"github.com/jessevdk/go-flags"
@@ -32,8 +33,6 @@ var (
 	lockDir     = os.Getenv("NETDATA_LOCK_DIR")
 	watchPath   = os.Getenv("NETDATA_PLUGINS_GOD_WATCH_PATH")
 	envLogLevel = os.Getenv("NETDATA_LOG_LEVEL")
-
-	version = "unknown"
 )
 
 func confDir(opts *cli.Option) multipath.MultiPath {
@@ -115,7 +114,7 @@ func main() {
 	opts := parseCLI()
 
 	if opts.Version {
-		fmt.Printf("go.d.plugin, version: %s\n", version)
+		fmt.Printf("go.d.plugin, version: %s\n", buildinfo.Version)
 		return
 	}
 
@@ -142,7 +141,7 @@ func main() {
 		MinUpdateEvery:       opts.UpdateEvery,
 	})
 
-	a.Debugf("plugin: name=%s, version=%s", a.Name, version)
+	a.Debugf("plugin: name=%s, version=%s", a.Name, buildinfo.Version)
 	if u, err := user.Current(); err == nil {
 		a.Debugf("current user: name=%s, uid=%s", u.Username, u.Uid)
 	}

src/go/collectors/go.d.plugin/hack/go-build.sh

@@ -36,7 +36,7 @@ WHICH="$1"
 VERSION="${TRAVIS_TAG:-$(git describe --tags --always --dirty)}"
 
 GOLDFLAGS=${GLDFLAGS:-}
-GOLDFLAGS="$GOLDFLAGS -w -s -X main.version=$VERSION"
+GOLDFLAGS="$GOLDFLAGS -w -s -X github.com/netdata/netdata/go/go.d.plugin/pkg/buildinfo.Version=$VERSION"
 
 build() {
   echo "Building ${GOOS}/${GOARCH}"

src/go/collectors/go.d.plugin/pkg/buildinfo/version.go

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package buildinfo
+
+// Version stores the agent's version number. It's set during the build process using build flags.
+var Version = "v0.0.0"

src/go/collectors/go.d.plugin/pkg/prometheus/client.go

@@ -42,8 +42,7 @@ type (
 )
 
 const (
-	acceptHeader    = `text/plain;version=0.0.4;q=1,*/*;q=0.1`
-	userAgentHeader = `netdata/go.d.plugin`
+	acceptHeader = `text/plain;version=0.0.4;q=1,*/*;q=0.1`
 )
 
 // New creates a Prometheus instance.
@@ -118,7 +117,6 @@ func (p *prometheus) fetch(w io.Writer) error {
 
 	req.Header.Add("Accept", acceptHeader)
 	req.Header.Add("Accept-Encoding", "gzip")
-	req.Header.Set("User-Agent", userAgentHeader)
 
 	resp, err := p.client.Do(req)
 	if err != nil {

src/go/collectors/go.d.plugin/pkg/web/request.go

@@ -4,9 +4,13 @@ package web
 
 import (
 	"encoding/base64"
+	"fmt"
 	"io"
 	"net/http"
 	"strings"
+
+	"github.com/netdata/netdata/go/go.d.plugin/agent/executable"
+	"github.com/netdata/netdata/go/go.d.plugin/pkg/buildinfo"
 )
 
 // Request is the configuration of the HTTP request.
@@ -50,6 +54,8 @@ func (r Request) Copy() Request {
 	return r
 }
 
+var userAgent = fmt.Sprintf("Netdata %s.plugin/%s", executable.Name, buildinfo.Version)
+
 // NewHTTPRequest returns a new *http.Requests given a Request configuration and an error if any.
 func NewHTTPRequest(cfg Request) (*http.Request, error) {
 	var body io.Reader
@@ -62,6 +68,8 @@ func NewHTTPRequest(cfg Request) (*http.Request, error) {
 		return nil, err
 	}
 
+	req.Header.Set("User-Agent", userAgent)
+
 	if cfg.Username != "" || cfg.Password != "" {
 		req.SetBasicAuth(cfg.Username, cfg.Password)
 	}