mirror of https://github.com/status-im/consul.git
Merge pull request #684 from ryanbreen/event
Website: cleanup for docs/agent/http/event.
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dc83201d56
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@ -20,15 +20,16 @@ The following endpoints are supported:
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### <a name="event_fire"></a> /v1/event/fire/\<name\>
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The fire endpoint is used to trigger a new user event. A user event
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needs a name, and optionally takes a number of parameters.
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needs a `name`, provided on the path. The endpoint also supports several
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optional parameters on the query string.
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By default, the agent's local datacenter is used, but another datacenter
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can be specified using the "?dc=" query parameter.
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The fire endpoint expects a PUT request, with an optional body.
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The body contents are opaque to Consul, and become the "payload"
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of the event. Any names starting with the "_" prefix should be considered
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reserved, and for Consul's internal use.
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The fire endpoint expects a PUT request with an optional body.
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The body contents are opaque to Consul and become the "payload"
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of the event. Names starting with the "_" prefix should be considered
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reserved for Consul's internal use.
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The `?node=`, `?service=`, and `?tag=` query parameters may optionally
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be provided. They respectively provide a regular expression to filter
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@ -49,7 +50,7 @@ The return code is 200 on success, along with a body like:
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}
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```
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This is used to provide the ID of the newly fired event.
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The `ID` field uniquely identifies the newly fired event.
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### <a name="event_list"></a> /v1/event/list
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@ -57,33 +58,31 @@ This endpoint is hit with a GET and returns the most recent
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events known by the agent. As a consequence of how the
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[event command](/docs/commands/event.html) works, each agent
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may have a different view of the events. Events are broadcast using
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the [gossip protocol](/docs/internals/gossip.html), which means
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they have no total ordering, nor do they make a promise of delivery.
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the [gossip protocol](/docs/internals/gossip.html), so
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they have no global ordering nor do they make a promise of delivery.
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Additionally, each node applies the node, service and tag filters
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Additionally, each node applies the `node`, `service` and `tag` filters
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locally before storing the event. This means the events at each agent
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may be different depending on their configuration.
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This endpoint does allow for filtering on events by name by providing
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This endpoint allows for filtering on events by name by providing
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the `?name=` query parameter.
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To support [watches](/docs/agent/watches.html), this endpoint supports
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blocking queries. However, the semantics of this endpoint are slightly
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different. Most blocking queries provide a monotonic index, and block
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different. Most blocking queries provide a monotonic index and block
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until a newer index is available. This can be supported as a consequence
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of the total ordering of the [consensus protocol](/docs/internals/consensus.html).
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With gossip, there is no ordering, and instead `X-Consul-Index` maps
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to the newest event that matches the query.
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In practice, this means the index is only useful when used against a
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single agent, and has no meaning globally. Because Consul defines
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single agent and has no meaning globally. Because Consul defines
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the index as being opaque, clients should not be expecting a natural
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ordering either.
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Agents only buffer the most recent entries. The number of entries should
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not be depended upon, but currently defaults to 256. This value could
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change in the future. The buffer should be large enough for most clients
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and watches.
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Agents only buffer the most recent entries. The current buffer size is
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256, but this value could change in the future.
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It returns a JSON body like this:
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