chore(config): remove deprecated controllers field

CHANGELOG.md

@@ -4,6 +4,9 @@ Canonical reference for changes, improvements, and bugfixes for Boundary.
 
 ## Next
 
+* Remove deprecated `controllers` field from the worker config, which was deprecated for
+`initial_upstreams`([PR]())
+
 ## 0.17.2 (Unreleased)
 
 ### Changes

internal/cmd/commands/server/server.go

@@ -340,9 +340,6 @@ func (c *Command) Run(args []string) int {
 			c.UI.Error(`Config activates worker but no listener with "proxy" purpose found`)
 			return base.CommandUserError
 		}
-		if c.Config.Worker.ControllersRaw != nil {
-			c.UI.Warn("The \"controllers\" field for worker config is deprecated. Please use \"initial_upstreams\" instead.")
-		}
 
 		if err := c.SetupWorkerPublicAddress(c.Config, ""); err != nil {
 			c.UI.Error(err.Error())

internal/cmd/config/config.go

@@ -271,10 +271,6 @@ type Worker struct {
 	InitialUpstreams    []string `hcl:"-"`
 	InitialUpstreamsRaw any      `hcl:"initial_upstreams"`
 
-	// The ControllersRaw field is deprecated and users should use InitialUpstreamsRaw instead.
-	// TODO: remove this field when support is discontinued.
-	ControllersRaw any `hcl:"controllers"`
-
 	// We use a raw interface for parsing so that people can use JSON-like
 	// syntax that maps directly to the filter input or possibly more familiar
 	// key=value syntax, as well as accepting a string denoting an env or file
@@ -1056,17 +1052,6 @@ func Parse(d string) (*Config, error) {
 	return result, nil
 }
 
-// supportControllersRawConfig returns either initialUpstreamsRaw or controllersRaw depending on which is populated. Errors when both fields are populated.
-func supportControllersRawConfig(initialUpstreamsRaw, controllersRaw any) (any, error) {
-	switch {
-	case initialUpstreamsRaw == nil && controllersRaw != nil:
-		return controllersRaw, nil
-	case initialUpstreamsRaw != nil && controllersRaw != nil:
-		return nil, fmt.Errorf("both initial_upstreams and controllers fields are populated")
-	}
-	return initialUpstreamsRaw, nil
-}
-
 func parseApiRateLimits(node ast.Node) (ratelimit.Configs, error) {
 	list, ok := node.(*ast.ObjectList)
 	if !ok {
@@ -1103,19 +1088,15 @@ func parseWorkerUpstreams(c *Config) ([]string, error) {
 	if c == nil || c.Worker == nil {
 		return nil, fmt.Errorf("config or worker field is nil")
 	}
-	if c.Worker.InitialUpstreamsRaw == nil && c.Worker.ControllersRaw == nil {
+	if c.Worker.InitialUpstreamsRaw == nil {
 		// return nil here so that other address sources can be provided outside of config
 		return nil, nil
 	}
-	rawUpstreams, err := supportControllersRawConfig(c.Worker.InitialUpstreamsRaw, c.Worker.ControllersRaw)
-	if err != nil {
-		return nil, err
-	}
 
-	switch t := rawUpstreams.(type) {
+	switch t := c.Worker.InitialUpstreamsRaw.(type) {
 	case []any:
 		var upstreams []string
-		err := mapstructure.WeakDecode(rawUpstreams, &upstreams)
+		err := mapstructure.WeakDecode(c.Worker.InitialUpstreamsRaw, &upstreams)
 		if err != nil {
 			return nil, fmt.Errorf("failed to decode worker initial_upstreams block into config field: %w", err)
 		}

internal/cmd/config/config_load_test.go

@@ -383,7 +383,6 @@ func TestLoad(t *testing.T) {
 					PublicAddr:                          "",
 					InitialUpstreams:                    []string{"boundary:9201"},
 					InitialUpstreamsRaw:                 []any{"boundary:9201"},
-					ControllersRaw:                      nil,
 					Tags:                                nil,
 					TagsRaw:                             nil,
 					SuccessfulStatusGracePeriodDuration: 0,
@@ -810,7 +809,6 @@ func TestLoad(t *testing.T) {
 					PublicAddr:                          "",
 					InitialUpstreams:                    []string{"boundary:9201"},
 					InitialUpstreamsRaw:                 []any{"boundary:9201"},
-					ControllersRaw:                      nil,
 					Tags:                                nil,
 					TagsRaw:                             nil,
 					SuccessfulStatusGracePeriodDuration: 0,
@@ -1232,7 +1230,6 @@ func TestLoad(t *testing.T) {
 					PublicAddr:                          "",
 					InitialUpstreams:                    []string{"boundary:9201"},
 					InitialUpstreamsRaw:                 []any{"boundary:9201"},
-					ControllersRaw:                      nil,
 					Tags:                                nil,
 					TagsRaw:                             nil,
 					SuccessfulStatusGracePeriodDuration: 0,
@@ -1673,7 +1670,6 @@ func TestLoad(t *testing.T) {
 					PublicAddr:                          "",
 					InitialUpstreams:                    []string{"boundary:9201"},
 					InitialUpstreamsRaw:                 []any{"boundary:9201"},
-					ControllersRaw:                      nil,
 					Tags:                                nil,
 					TagsRaw:                             nil,
 					SuccessfulStatusGracePeriodDuration: 0,

internal/cmd/config/config_test.go

@@ -1609,40 +1609,6 @@ func TestWorkerUpstreams(t *testing.T) {
 			expErr:             true,
 			expErrIs:           parseutil.ErrNotAUrl,
 		},
-		{
-			name: "Worker using deprecated controllers field",
-			in: `
-			worker {
-				name = "test"
-				controllers = ["127.0.0.1", "127.0.0.2", "127.0.0.3"]
-			}`,
-			expWorkerUpstreams: []string{"127.0.0.1", "127.0.0.2", "127.0.0.3"},
-			expErr:             false,
-		},
-		{
-			name: "Different values in controllers and initial_upstreams field",
-			in: `
-			worker {
-				name = "test"
-				controllers = ["127.0.0.1", "127.0.0.2", "127.0.0.3"]
-				initial_upstreams = ["127.0.0.1"]
-			}`,
-			expWorkerUpstreams: nil,
-			expErr:             true,
-			expErrStr:          "Failed to parse worker upstreams: both initial_upstreams and controllers fields are populated",
-		},
-		{
-			name: "Identical values in controllers and initial_upstreams field",
-			in: `
-			worker {
-				name = "test"
-				controllers = ["127.0.0.1"]
-				initial_upstreams = ["127.0.0.1"]
-			}`,
-			expWorkerUpstreams: nil,
-			expErr:             true,
-			expErrStr:          "Failed to parse worker upstreams: both initial_upstreams and controllers fields are populated",
-		},
 	}
 
 	for _, tt := range tests {