mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
41 lines
984 B
Go
41 lines
984 B
Go
package v1
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import (
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"encoding/json"
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"net/http"
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"strconv"
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etcdErr "github.com/coreos/etcd/error"
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"github.com/gorilla/mux"
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)
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// Watches a given key prefix for changes.
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func WatchKeyHandler(w http.ResponseWriter, req *http.Request, s Server) error {
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var err error
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vars := mux.Vars(req)
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key := "/" + vars["key"]
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// Create a command to watch from a given index (default 0).
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var sinceIndex uint64 = 0
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if req.Method == "POST" {
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sinceIndex, err = strconv.ParseUint(string(req.FormValue("index")), 10, 64)
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if err != nil {
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return etcdErr.NewError(203, "Watch From Index", s.Store().Index())
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}
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}
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// Start the watcher on the store.
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watcher, err := s.Store().Watch(key, false, false, sinceIndex)
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if err != nil {
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return etcdErr.NewError(500, key, s.Store().Index())
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}
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event := <-watcher.EventChan
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// Convert event to a response and write to client.
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b, _ := json.Marshal(event.Response(s.Store().Index()))
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w.WriteHeader(http.StatusOK)
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w.Write(b)
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return nil
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}
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