[awsproxy] Expose service name as config option (#29550)

awsproxy extension can be used as proxy to any service not just xray. The service name variable was hardcoded to "xray". This PR exposes it to be configurable in the config.yaml

Appropriate README of the extension has been updated to reflect the
addition of new option

Signed-off-by: Arpit Agarwal <arpitjindal97@gmail.com>

.chloggen/main.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: awsproxyextension
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Expose service_name as configurable option. Previously, it was hardcoded as xray."
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [29550]
+
+# (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:
+
+# 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: [user]

extension/awsproxy/README.md

@@ -35,6 +35,7 @@ extensions:
     role_arn: ""
     aws_endpoint: ""
     local_mode: false
+    service_name: "xray"
 ```
 
 ### endpoint (Optional)
@@ -66,3 +67,5 @@ The IAM role used by this proxy when communicating with the AWS service. If non-
 ### aws_endpoint (Optional)
 The AWS service endpoint which this proxy forwards requests to. If not set, will default to the AWS X-Ray endpoint.
 
+### service_name (Optional)
+The AWS service name which this proxy forwards requests to. If not set, will default to "xray"

extension/awsproxy/config_test.go

@@ -44,6 +44,7 @@ func TestLoadConfig(t *testing.T) {
 					Region:      "us-west-1",
 					RoleARN:     "arn:aws:iam::123456789012:role/awesome_role",
 					AWSEndpoint: "https://another.aws.endpoint.com",
+					ServiceName: "es",
 				},
 			},
 		},

extension/awsproxy/testdata/config.yaml

@@ -8,3 +8,4 @@ awsproxy/1:
   region: "us-west-1"
   role_arn: "arn:aws:iam::123456789012:role/awesome_role"
   aws_endpoint: "https://another.aws.endpoint.com"
+  service_name: "es"

internal/aws/proxy/cfg.go

@@ -40,6 +40,10 @@ type Config struct {
 	// will be called or not. Set to `true` to skip EC2 instance
 	// metadata check.
 	LocalMode bool `mapstructure:"local_mode"`
+
+	// ServiceName determines which service the requests are sent to.
+	// will be default to `xray`. This is mandatory for SigV4
+	ServiceName string `mapstructure:"service_name"`
 }
 
 func DefaultConfig() *Config {
@@ -55,5 +59,6 @@ func DefaultConfig() *Config {
 		Region:      "",
 		RoleARN:     "",
 		AWSEndpoint: "",
+		ServiceName: "xray",
 	}
 }

internal/aws/proxy/server.go

@@ -25,7 +25,6 @@ import (
 )
 
 const (
-	service    = "xray"
 	connHeader = "Connection"
 )
 
@@ -45,13 +44,16 @@ func NewServer(cfg *Config, logger *zap.Logger) (Server, error) {
 	if cfg.ProxyAddress != "" {
 		logger.Debug("Using remote proxy", zap.String("address", cfg.ProxyAddress))
 	}
+	if cfg.ServiceName == "" {
+		cfg.ServiceName = "xray"
+	}
 
 	awsCfg, sess, err := getAWSConfigSession(cfg, logger)
 	if err != nil {
 		return nil, err
 	}
 
-	awsEndPoint, err := getServiceEndpoint(awsCfg)
+	awsEndPoint, err := getServiceEndpoint(awsCfg, cfg.ServiceName)
 	if err != nil {
 		return nil, err
 	}
@@ -101,7 +103,7 @@ func NewServer(cfg *Config, logger *zap.Logger) (Server, error) {
 			}
 
 			// Sign request. signer.Sign() also repopulates the request body.
-			_, err = signer.Sign(req, body, service, *awsCfg.Region, time.Now())
+			_, err = signer.Sign(req, body, cfg.ServiceName, *awsCfg.Region, time.Now())
 			if err != nil {
 				logger.Error("Unable to sign request", zap.Error(err))
 			}
@@ -117,13 +119,13 @@ func NewServer(cfg *Config, logger *zap.Logger) (Server, error) {
 
 // getServiceEndpoint returns X-Ray service endpoint.
 // It is guaranteed that awsCfg config instance is non-nil and the region value is non nil or non empty in awsCfg object.
-// Currently the caller takes care of it.
-func getServiceEndpoint(awsCfg *aws.Config) (string, error) {
+// Currently, the caller takes care of it.
+func getServiceEndpoint(awsCfg *aws.Config, serviceName string) (string, error) {
 	if isEmpty(awsCfg.Endpoint) {
 		if isEmpty(awsCfg.Region) {
 			return "", errors.New("unable to generate endpoint from region with nil value")
 		}
-		resolved, err := endpoints.DefaultResolver().EndpointFor(service, *awsCfg.Region, setResolverConfig())
+		resolved, err := endpoints.DefaultResolver().EndpointFor(serviceName, *awsCfg.Region, setResolverConfig())
 		return resolved.URL, err
 	}
 	return *awsCfg.Endpoint, nil

internal/aws/proxy/server_test.go

@@ -241,7 +241,7 @@ func TestCanCreateTransport(t *testing.T) {
 }
 
 func TestGetServiceEndpointInvalidAWSConfig(t *testing.T) {
-	_, err := getServiceEndpoint(&aws.Config{})
+	_, err := getServiceEndpoint(&aws.Config{}, "")
 	assert.EqualError(t, err, "unable to generate endpoint from region with nil value")
 }
 

receiver/awsxrayreceiver/config_test.go

@@ -51,6 +51,7 @@ func TestLoadConfig(t *testing.T) {
 					Region:      "",
 					RoleARN:     "",
 					AWSEndpoint: "",
+					ServiceName: "xray",
 				},
 			},
 		},
@@ -74,6 +75,7 @@ func TestLoadConfig(t *testing.T) {
 					RoleARN:     "arn:aws:iam::123456789012:role/awesome_role",
 					AWSEndpoint: "https://another.aws.endpoint.com",
 					LocalMode:   true,
+					ServiceName: "xray",
 				},
 			}},
 	}