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Rename Handlers (#14)

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This commit is contained in:
ben-toogood
2020-10-16 13:48:31 +01:00
committed by GitHub
parent 784ed763fd
commit d62a96310b
4 changed files with 39 additions and 24 deletions
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23
chat/handler/handler.go
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@@ -16,24 +16,19 @@ import (
pb "github.com/micro/services/chat/proto"
)
// New returns an initialized chat handler
func New() pb.ChatHandler {
return new(handler)
}
const (
chatStoreKeyPrefix = "chats/"
chatEventKeyPrefix = "chats/"
messageStoreKeyPrefix = "messages/"
)
// handler satisfies the ChatHandler interface. You can see this inteface defined in chat.pb.micro.go
type handler struct{}
// Chat satisfies the ChatHandler interface. You can see this inteface defined in chat.pb.micro.go
type Chat struct{}
// New creates a chat for a group of users. The RPC is idempotent so if it's called multiple times
// for the same users, the same response will be returned. It's good practice to design APIs as
// idempotent since this enables safe retries.
func (h *handler) New(ctx context.Context, req *pb.NewRequest, rsp *pb.NewResponse) error {
func (c *Chat) New(ctx context.Context, req *pb.NewRequest, rsp *pb.NewResponse) error {
// in a real world application we would authorize the request to ensure the authenticated user
// is part of the chat they're attempting to create. We could do this by getting the user id from
// auth.AccountFromContext(ctx) and then validating the presence of their id in req.UserIds. If
@@ -95,7 +90,7 @@ func (h *handler) New(ctx context.Context, req *pb.NewRequest, rsp *pb.NewRespon
}
// History returns the historical messages in a chat
func (h *handler) History(ctx context.Context, req *pb.HistoryRequest, rsp *pb.HistoryResponse) error {
func (c *Chat) History(ctx context.Context, req *pb.HistoryRequest, rsp *pb.HistoryResponse) error {
// as per the New function, in a real world application we would authorize the request to ensure
// the authenticated user is part of the chat they're attempting to read the history of
@@ -138,7 +133,7 @@ func (h *handler) History(ctx context.Context, req *pb.HistoryRequest, rsp *pb.H
}
// Send a single message to the chat, designed for ease of use via the API / CLI
func (h *handler) Send(ctx context.Context, req *pb.SendRequest, rsp *pb.SendResponse) error {
func (c *Chat) Send(ctx context.Context, req *pb.SendRequest, rsp *pb.SendResponse) error {
// validate the request
if len(req.ChatId) == 0 {
return errors.BadRequest("chat.Send.MissingChatID", "ChatID is missing")
@@ -166,14 +161,14 @@ func (h *handler) Send(ctx context.Context, req *pb.SendRequest, rsp *pb.SendRes
}
// create the message
return h.createMessage(msg)
return c.createMessage(msg)
}
// Connect to a chat using a bidirectional stream enabling the client to send and recieve messages
// over a single RPC. When a message is sent on the stream, it will be added to the chat history
// and sent to the other connected users. When opening the connection, the client should provide
// the chat_id and user_id in the context so the server knows which messages to stream.
func (h *handler) Connect(ctx context.Context, stream pb.Chat_ConnectStream) error {
func (c *Chat) Connect(ctx context.Context, stream pb.Chat_ConnectStream) error {
// the client passed the chat id and user id in the request context. we'll load that information
// now and validate it. If any information is missing we'll return a BadRequest error to the client
userID, ok := metadata.Get(ctx, "user-id")
@@ -272,7 +267,7 @@ func (h *handler) Connect(ctx context.Context, stream pb.Chat_ConnectStream) err
msg.ChatId = chatID
// create the message
if err := h.createMessage(msg); err != nil {
if err := c.createMessage(msg); err != nil {
return err
}
}
@@ -281,7 +276,7 @@ func (h *handler) Connect(ctx context.Context, stream pb.Chat_ConnectStream) err
// createMessage is a helper function which creates a message in the event stream. It handles the
// logic for ensuring client id is unique.
func (h *handler) createMessage(msg *pb.Message) error {
func (c *Chat) createMessage(msg *pb.Message) error {
// a message was recieved from the client. validate it hasn't been recieved before
if _, err := store.Read(messageStoreKeyPrefix + msg.ClientId); err == nil {
// the message has already been processed