feature (downstreams): Add hooks for optional downstream workers/router (#2359)

This includes the required interfaces, factories, error codes, etc

internal/errors/code.go

@@ -21,28 +21,30 @@ const (
 	Unknown Code = 0 // Unknown will be equal to a zero value for Codes
 
 	// General function errors are reserved Codes 100-999
-	InvalidParameter         Code = 100 // InvalidParameter represents an invalid parameter for an operation.
-	InvalidAddress           Code = 101 // InvalidAddress represents an invalid host address for an operation
-	InvalidPublicId          Code = 102 // InvalidPublicId represents an invalid public Id for an operation
-	InvalidFieldMask         Code = 103 // InvalidFieldMask represents an invalid field mast for an operation
-	EmptyFieldMask           Code = 104 // EmptyFieldMask represents an empty field mask for an operation
-	KeyNotFound              Code = 105 // KeyNotFound represents that a key/version was not found in the KMS
-	TicketAlreadyRedeemed    Code = 106 // TicketAlreadyRedeemed represents that the ticket version has already been redeemed
-	TicketNotFound           Code = 107 // TicketNotFound represents that the ticket was not found
-	Io                       Code = 108 // Io represents that an io error occurred in an underlying call (i.e binary.Write)
-	InvalidTimeStamp         Code = 109 // InvalidTimeStamp represents an invalid time stamp for an operation
-	SessionNotFound          Code = 110 // SessionNotFound represents that the session was not found
-	InvalidSessionState      Code = 111 // InvalidSessionState represents that the session was in an invalid state
-	TokenMismatch            Code = 112 // TokenMismatch represents that there was a token mismatch
-	TooShort                 Code = 113 // TooShort represents an error that means the provided input is not meeting minimum length requirements
-	AccountAlreadyAssociated Code = 114 // AccountAlreadyAssociated represents an attempt to associate an account failed since it was already associated.
-	InvalidJobRunState       Code = 115 // InvalidJobRunState represents that a JobRun was in an invalid state
-	InvalidDynamicCredential Code = 116 // InvalidDynamicCredential represents that a dynamic credential for a session was in an invalid state
-	JobAlreadyRunning        Code = 117 // JobAlreadyRunning represents that a Job is already running when an attempt to run again was made
-	SubtypeAlreadyRegistered Code = 118 // SubtypeAlreadyRegistered represents that a value has already been registered in the subtype registry system.
-	NoPathFound                   = 119 // NoPathFound represents an error when no path is found to a worker
-	WorkerNotFound                = 120 // WorkerNotFound represents an error when a worker is not found in the graph of downstream workers
-	CycleFound                    = 121 // CycleFound represents an error when a cycle is found between a parent and child worker
+	InvalidParameter              Code = 100 // InvalidParameter represents an invalid parameter for an operation.
+	InvalidAddress                Code = 101 // InvalidAddress represents an invalid host address for an operation
+	InvalidPublicId               Code = 102 // InvalidPublicId represents an invalid public Id for an operation
+	InvalidFieldMask              Code = 103 // InvalidFieldMask represents an invalid field mast for an operation
+	EmptyFieldMask                Code = 104 // EmptyFieldMask represents an empty field mask for an operation
+	KeyNotFound                   Code = 105 // KeyNotFound represents that a key/version was not found in the KMS
+	TicketAlreadyRedeemed         Code = 106 // TicketAlreadyRedeemed represents that the ticket version has already been redeemed
+	TicketNotFound                Code = 107 // TicketNotFound represents that the ticket was not found
+	Io                            Code = 108 // Io represents that an io error occurred in an underlying call (i.e binary.Write)
+	InvalidTimeStamp              Code = 109 // InvalidTimeStamp represents an invalid time stamp for an operation
+	SessionNotFound               Code = 110 // SessionNotFound represents that the session was not found
+	InvalidSessionState           Code = 111 // InvalidSessionState represents that the session was in an invalid state
+	TokenMismatch                 Code = 112 // TokenMismatch represents that there was a token mismatch
+	TooShort                      Code = 113 // TooShort represents an error that means the provided input is not meeting minimum length requirements
+	AccountAlreadyAssociated      Code = 114 // AccountAlreadyAssociated represents an attempt to associate an account failed since it was already associated.
+	InvalidJobRunState            Code = 115 // InvalidJobRunState represents that a JobRun was in an invalid state
+	InvalidDynamicCredential      Code = 116 // InvalidDynamicCredential represents that a dynamic credential for a session was in an invalid state
+	JobAlreadyRunning             Code = 117 // JobAlreadyRunning represents that a Job is already running when an attempt to run again was made
+	SubtypeAlreadyRegistered      Code = 118 // SubtypeAlreadyRegistered represents that a value has already been registered in the subtype registry system.
+	NoPathFound                        = 119 // NoPathFound represents an error when no path is found to a worker
+	WorkerNotFound                     = 120 // WorkerNotFound represents an error when a worker is not found in the graph of downstream workers
+	CycleFound                         = 121 // CycleFound represents an error when a cycle is found between a parent and child worker
+	WorkerConnNotFound                 = 122 // WorkerConnNotFound represents an error when a connection to a worker is not found
+	KmsWorkerUnsupportedOperation      = 123 // KmsWorkerUnsupportedOperation represents an error when a KMS worker is not supported for an operation
 
 	AuthAttemptExpired Code = 198 // AuthAttemptExpired represents an expired authentication attempt
 	AuthMethodInactive Code = 199 // AuthMethodInactive represents an error that means the auth method is not active.