open-nomad/command/agent/helpers.go

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package agent
// rpcHandlerForAlloc is a helper that given an allocation ID returns whether to
// use the local clients RPC, the local clients remote RPC or the server on the
// agent.
func (s *HTTPServer) rpcHandlerForAlloc(allocID string) (localClient, remoteClient, server bool) {
c := s.agent.Client()
srv := s.agent.Server()
// See if the local client can handle the request.
localAlloc := false
if c != nil {
_, err := c.GetClientAlloc(allocID)
if err == nil {
localAlloc = true
}
}
// Only use the client RPC to server if we don't have a server and the local
// client can't handle the call.
useClientRPC := c != nil && !localAlloc && srv == nil
// Use the server as a last case.
useServerRPC := !localAlloc && !useClientRPC && srv != nil
return localAlloc, useClientRPC, useServerRPC
}
// rpcHandlerForNode is a helper that given a node ID returns whether to
// use the local clients RPC, the local clients remote RPC or the server on the
// agent. If there is a local node and no node id is given, it is assumed the
// local node is being targed.
func (s *HTTPServer) rpcHandlerForNode(nodeID string) (localClient, remoteClient, server bool) {
c := s.agent.Client()
srv := s.agent.Server()
// See if the local client can handle the request.
localClient = c != nil && // Must have a client
(nodeID == "" || // If no node ID is given
nodeID == c.NodeID()) // Requested node is the local node.
// Only use the client RPC to server if we don't have a server and the local
// client can't handle the call.
useClientRPC := c != nil && !localClient && srv == nil
// Use the server as a last case.
useServerRPC := !localClient && !useClientRPC && srv != nil && nodeID != ""
return localClient, useClientRPC, useServerRPC
}