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export const ConnectionState = {
INIT: Symbol("init"),
FETCHING: Symbol("fetching"), // WebSocket is established, but still fetching resources.
ESTABLISHED: Symbol("established"),
ERROR: Symbol("error"),
OFFLINE: Symbol("offline"), // indicates that there is no live (websocket) backend.
}
const defaultState = {
state: ConnectionState.INIT,
message: null,
}
export default function reducer(state = defaultState, action) {
switch (action.type) {
case ConnectionState.ESTABLISHED:
case ConnectionState.FETCHING:
case ConnectionState.ERROR:
case ConnectionState.OFFLINE:
return {
state: action.type,
message: action.message
}
default:
return state
}
}
export function startFetching() {
return { type: ConnectionState.FETCHING }
}
export function connectionEstablished() {
return { type: ConnectionState.ESTABLISHED }
}
export function connectionError(message) {
return { type: ConnectionState.ERROR, message }
}
export function setOffline() {
return { type: ConnectionState.OFFLINE }
}
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