Add common HTTP client to AWS SDs (#11611)

* Common client in EC2 and Lightsail

Signed-off-by: Levi Harrison <git@leviharrison.dev>

* Azure -> AWS

Signed-off-by: Levi Harrison <git@leviharrison.dev>

Signed-off-by: Levi Harrison <git@leviharrison.dev>

config/config_test.go

@@ -586,6 +586,7 @@ var expectedConf = &Config{
 							Values: []string{"web", "db"},
 						},
 					},
+					HTTPClientConfig: config.DefaultHTTPClientConfig,
 				},
 			},
 		},
@@ -608,6 +609,7 @@ var expectedConf = &Config{
 					Profile:          "profile",
 					RefreshInterval:  model.Duration(60 * time.Second),
 					Port:             80,
+					HTTPClientConfig: config.DefaultHTTPClientConfig,
 				},
 			},
 		},

discovery/aws/ec2.go

@@ -68,6 +68,7 @@ const (
 var DefaultEC2SDConfig = EC2SDConfig{
 	Port:             80,
 	RefreshInterval:  model.Duration(60 * time.Second),
+	HTTPClientConfig: config.DefaultHTTPClientConfig,
 }
 
 func init() {
@@ -91,6 +92,8 @@ type EC2SDConfig struct {
 	RefreshInterval model.Duration `yaml:"refresh_interval,omitempty"`
 	Port            int            `yaml:"port"`
 	Filters         []*EC2Filter   `yaml:"filters"`
+
+	HTTPClientConfig config.HTTPClientConfig `yaml:",inline"`
 }
 
 // Name returns the name of the EC2 Config.
@@ -171,11 +174,17 @@ func (d *EC2Discovery) ec2Client(ctx context.Context) (*ec2.EC2, error) {
 		creds = nil
 	}
 
+	client, err := config.NewClientFromConfig(d.cfg.HTTPClientConfig, "ec2_sd")
+	if err != nil {
+		return nil, err
+	}
+
 	sess, err := session.NewSessionWithOptions(session.Options{
 		Config: aws.Config{
 			Endpoint:    &d.cfg.Endpoint,
 			Region:      &d.cfg.Region,
 			Credentials: creds,
+			HTTPClient:  client,
 		},
 		Profile: d.cfg.Profile,
 	})

discovery/aws/lightsail.go

@@ -58,6 +58,7 @@ const (
 var DefaultLightsailSDConfig = LightsailSDConfig{
 	Port:             80,
 	RefreshInterval:  model.Duration(60 * time.Second),
+	HTTPClientConfig: config.DefaultHTTPClientConfig,
 }
 
 func init() {
@@ -74,6 +75,8 @@ type LightsailSDConfig struct {
 	RoleARN         string         `yaml:"role_arn,omitempty"`
 	RefreshInterval model.Duration `yaml:"refresh_interval,omitempty"`
 	Port            int            `yaml:"port"`
+
+	HTTPClientConfig config.HTTPClientConfig `yaml:",inline"`
 }
 
 // Name returns the name of the Lightsail Config.
@@ -144,11 +147,17 @@ func (d *LightsailDiscovery) lightsailClient() (*lightsail.Lightsail, error) {
 		creds = nil
 	}
 
+	client, err := config.NewClientFromConfig(d.cfg.HTTPClientConfig, "lightsail_sd")
+	if err != nil {
+		return nil, err
+	}
+
 	sess, err := session.NewSessionWithOptions(session.Options{
 		Config: aws.Config{
 			Endpoint:    &d.cfg.Endpoint,
 			Region:      &d.cfg.Region,
 			Credentials: creds,
+			HTTPClient:  client,
 		},
 		Profile: d.cfg.Profile,
 	})

docs/configuration/configuration.md

@@ -1064,6 +1064,45 @@ See below for the configuration options for EC2 discovery:
 filters:
   [ - name: <string>
       values: <string>, [...] ]
+
+# Authentication information used to authenticate to the EC2 API.
+# Note that `basic_auth`, `authorization` and `oauth2` options are
+# mutually exclusive.
+# `password` and `password_file` are mutually exclusive.
+
+# Optional HTTP basic authentication information, currently not supported by AWS.
+basic_auth:
+  [ username: <string> ]
+  [ password: <secret> ]
+  [ password_file: <string> ]
+
+# Optional `Authorization` header configuration, currently not supported by AWS.
+authorization:
+  # Sets the authentication type.
+  [ type: <string> | default: Bearer ]
+  # Sets the credentials. It is mutually exclusive with
+  # `credentials_file`.
+  [ credentials: <secret> ]
+  # Sets the credentials to the credentials read from the configured file.
+  # It is mutuall exclusive with `credentials`.
+  [ credentials_file: <filename> ]
+
+# Optional OAuth 2.0 configuration, currently not supported by AWS.
+oauth2:
+  [ <oauth2> ]
+
+# Optional proxy URL.
+[ proxy_url: <string> ]
+
+# Configure whether HTTP requests follow HTTP 3xx redirects.
+[ follow_redirects: <boolean> | default = true ]
+
+# Whether to enable HTTP2.
+[ enable_http2: <bool> | default: true ]
+
+# TLS configuration.
+tls_config:
+  [ <tls_config> ]
 ```
 
 The [relabeling phase](#relabel_config) is the preferred and more powerful
@@ -2066,6 +2105,45 @@ See below for the configuration options for Lightsail discovery:
 # The port to scrape metrics from. If using the public IP address, this must
 # instead be specified in the relabeling rule.
 [ port: <int> | default = 80 ]
+
+# Authentication information used to authenticate to the Lightsail API.
+# Note that `basic_auth`, `authorization` and `oauth2` options are
+# mutually exclusive.
+# `password` and `password_file` are mutually exclusive.
+
+# Optional HTTP basic authentication information, currently not supported by AWS.
+basic_auth:
+  [ username: <string> ]
+  [ password: <secret> ]
+  [ password_file: <string> ]
+
+# Optional `Authorization` header configuration, currently not supported by AWS.
+authorization:
+  # Sets the authentication type.
+  [ type: <string> | default: Bearer ]
+  # Sets the credentials. It is mutually exclusive with
+  # `credentials_file`.
+  [ credentials: <secret> ]
+  # Sets the credentials to the credentials read from the configured file.
+  # It is mutuall exclusive with `credentials`.
+  [ credentials_file: <filename> ]
+
+# Optional OAuth 2.0 configuration, currently not supported by AWS.
+oauth2:
+  [ <oauth2> ]
+
+# Optional proxy URL.
+[ proxy_url: <string> ]
+
+# Configure whether HTTP requests follow HTTP 3xx redirects.
+[ follow_redirects: <boolean> | default = true ]
+
+# Whether to enable HTTP2.
+[ enable_http2: <bool> | default: true ]
+
+# TLS configuration.
+tls_config:
+  [ <tls_config> ]
 ```
 
 ### `<linode_sd_config>`