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package consulapi
import (
"bytes"
"strconv"
)
// Event can be used to query the Event endpoints
type Event struct {
c *Client
}
// UserEvent represents an event that was fired by the user
type UserEvent struct {
ID string
Name string
Payload []byte
NodeFilter string
ServiceFilter string
TagFilter string
Version int
LTime uint64
}
// Event returns a handle to the event endpoints
func (c *Client) Event() *Event {
return &Event{c}
}
// Fire is used to fire a new user event. Only the Name, Payload and Filters
// are respected. This returns the ID or an associated error. Cross DC requests
// are supported.
func (e *Event) Fire(params *UserEvent, q *WriteOptions) (string, *WriteMeta, error) {
r := e.c.newRequest("PUT", "/v1/event/fire/"+params.Name)
r.setWriteOptions(q)
if params.NodeFilter != "" {
r.params.Set("node", params.NodeFilter)
}
if params.ServiceFilter != "" {
r.params.Set("service", params.ServiceFilter)
}
if params.TagFilter != "" {
r.params.Set("tag", params.TagFilter)
}
if params.Payload != nil {
r.body = bytes.NewReader(params.Payload)
}
rtt, resp, err := requireOK(e.c.doRequest(r))
if err != nil {
return "", nil, err
}
defer resp.Body.Close()
wm := &WriteMeta{RequestTime: rtt}
var out UserEvent
if err := decodeBody(resp, &out); err != nil {
return "", nil, err
}
return out.ID, wm, nil
}
// List is used to get the most recent events an agent has received.
// This list can be optionally filtered by the name. This endpoint supports
// quasi-blocking queries. The index is not monotonic, nor does it provide provide
// LastContact or KnownLeader.
func (e *Event) List(name string, q *QueryOptions) ([]*UserEvent, *QueryMeta, error) {
r := e.c.newRequest("GET", "/v1/event/list")
r.setQueryOptions(q)
if name != "" {
r.params.Set("name", name)
}
rtt, resp, err := requireOK(e.c.doRequest(r))
if err != nil {
return nil, nil, err
}
defer resp.Body.Close()
qm := &QueryMeta{}
parseQueryMeta(resp, qm)
qm.RequestTime = rtt
var entries []*UserEvent
if err := decodeBody(resp, &entries); err != nil {
return nil, nil, err
}
return entries, qm, nil
}
// IDToIndex is a bit of a hack. This simulates the index generation to
// convert an event ID into a WaitIndex.
func (e *Event) IDToIndex(uuid string) uint64 {
lower := uuid[0:8] + uuid[9:13] + uuid[14:18]
upper := uuid[19:23] + uuid[24:36]
lowVal, err := strconv.ParseUint(lower, 16, 64)
if err != nil {
panic("Failed to convert " + lower)
}
highVal, err := strconv.ParseUint(upper, 16, 64)
if err != nil {
panic("Failed to convert " + upper)
}
return lowVal ^ highVal
}
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