Add backward compat for old remote servers vs new destination changes

Old fields are now requested by remote clients from old servers, so
remote clients can fallback to that data manually if required. New
clients + servers can freely use 'destination' instead of the various
upstream/hostname fields everywhere.

Author: pimterry

src/admin/mockttp-schema.ts

@@ -64,8 +64,8 @@ export const MockttpSchema = gql`
         id: String!
 
         destination: Destination!
+        hostname: String # Deprecated
 
-        hostname: String
         remoteIpAddress: String!
         remotePort: Int!
         tags: [String!]!
@@ -76,7 +76,9 @@ export const MockttpSchema = gql`
     type TlsHandshakeFailure {
         failureCause: String!
 
-        hostname: String
+        destination: Destination
+        hostname: String # Deprecated
+
         remoteIpAddress: String
         remotePort: Int
         tags: [String!]!

src/client/mockttp-admin-request-builder.ts

@@ -230,7 +230,10 @@ export class MockttpAdminRequestBuilder {
                     ${this.schema.asOptionalField('InitiatedRequest', 'remoteIpAddress')}
                     ${this.schema.asOptionalField('InitiatedRequest', 'remotePort')}
 
-                    ${this.schema.asOptionalField('InitiatedRequest', 'destination', 'destination { hostname, port }')}
+                    ${this.schema.typeHasField('InitiatedRequest', 'destination')
+                        ? 'destination { hostname, port }'
+                        : 'hostname' // Backward compat for old servers
+                    }
 
                     rawHeaders
                     timingEvents
@@ -249,7 +252,10 @@ export class MockttpAdminRequestBuilder {
                     ${this.schema.asOptionalField('Request', 'remoteIpAddress')}
                     ${this.schema.asOptionalField('Request', 'remotePort')}
 
-                    ${this.schema.asOptionalField('Request', 'destination', 'destination { hostname, port }')}
+                    ${this.schema.typeHasField('Request', 'destination')
+                        ? 'destination { hostname, port }'
+                        : 'hostname' // Backward compat for old servers
+                    }
 
                     rawHeaders
                     body
@@ -285,7 +291,10 @@ export class MockttpAdminRequestBuilder {
                     remoteIpAddress
                     remotePort
 
-                    ${this.schema.asOptionalField('Request', 'destination', 'destination { hostname, port }')}
+                    ${this.schema.typeHasField('Request', 'destination')
+                        ? 'destination { hostname, port }'
+                        : 'hostname' // Backward compat for old servers
+                    }
 
                     rawHeaders
                     body
@@ -353,7 +362,10 @@ export class MockttpAdminRequestBuilder {
                     url
                     path
 
-                    ${this.schema.asOptionalField('AbortedRequest', 'destination', 'destination { hostname, port }')}
+                    ${this.schema.typeHasField('AbortedRequest', 'destination')
+                        ? 'destination { hostname, port }'
+                        : 'hostname' // Backward compat for old servers
+                    }
 
                     rawHeaders
 
@@ -406,7 +418,12 @@ export class MockttpAdminRequestBuilder {
             'tls-client-error': gql`subscription OnTlsClientError {
                 failedTlsRequest {
                     failureCause
-                    hostname
+
+                    ${this.schema.typeHasField('TlsHandshakeFailure', 'destination')
+                        ? 'destination { hostname, port }'
+                        : 'hostname'
+                    }
+
                     remoteIpAddress
                     remotePort
                     tags