Awesome
nsq-nodes
Nsq helper to poll a nsqlookupd service for all it's nodes and mirror it locally.
INFO: all examples are written in coffee-script
Install
npm install nsq-nodes
Initialize
new NsqNodes( config );
Example:
var NsqNodes = require( "nsq-nodes" )
var nodes = new NsqNodes({
// Listen to two local nsq lookupservers
"lookupdHTTPAddresses": [ "127.0.0.1:4161", "127.0.0.1:4163" ]
});
// get the current list of nodes
nodes.list( function( err, nodes ){
if( err ){
// handle the error
}
console.log( nodes ) // -> an array of nodes. E.g.: ( )`users`, `logins`, ... )
// listen for new nodes
nodes.on( "add", function( node ){
// called until a new node arrived
});
// listen for removed nodes
nodes.on( "remove", function( node ){
// called until a node was removed
});
// listen for node list changes
nodes.on( "change", function( nodeList ){
// beside the `add` and `remove` events a single "change" event will be emitted
});
// listen for errors
nodes.on( "error", function( err ){
// E.g. called if a invalid filter was used or no lookup server is available
});
});
Config
- lookupdHTTPAddresses : (
String|String[]
required ) A single or multiple nsqlookupd hosts. This is also a configuration of 'nsqjs' - lookupdPollInterval : (
Number
optional: default =60
) Time in seconds to poll the nsqlookupd servers to sync the available nodes. This is also a configuration of 'nsqjs' - active : (
Boolean
optional: default =true
) Configuration to (de)activate the nsq nodes on startup
Methods
.activate()
Activate the module
Return
( Boolean ): true
if it is now activated. false
if it was already active
.deactivate()
Deactivate the module
Return
( Boolean ): true
if it is now deactivated. false
if it was already inactive
.active()
Test if the module is currently active
Return
( Boolean ): Is active?
.list( cb )
Get a list of the current nodes
cb
: (Function
optional ): Callback to get the list of nodes
Return
( Self ): The instance itself for chaining.
Example:
nodes.list( function( err, nodes ){
if( err ){
// handle the error
}
console.log( nodes ) // -> an array of nodes. E.g.: ( )`users`, `logins`, ... )
});
Events
add
A new node was added
Arguments
- node : (
String
) The new node
Example:
nodes.on( "add", function( node ){
// called until a new node arrived
});
remove
A existing node was removed
Arguments
- node : (
String
) The removed node
Example:
nodes.on( "remove", function( node ){
// called until a node was removed
});
change
The list of nodes changed
Arguments
- nodes : (
String[]
) A list of current nodes
Example:
nodes.on( "change", function( nodeList ){
// beside the `add` and `remove` events a single "change" event will be emitted
});
error
An error occurred. E.g. called if a invalid filter was used or no lookup server is available
Arguments
- err : (
Error
) The error object.
Example:
nodes.on( "error", function( err ){
// handle the error
});
ready
Emitted once the list of nodes where received the first time.
This is just an internal helper. The Method list
will also wait for the first response. The events add
, remove
and change
are active after this first response.
Example:
nodes.on( "ready", function( err ){
// handle the error
});
Release History
Version | Date | Description |
---|---|---|
1.1.0 | 2019-01-25 | now able to handle the formats of nsq < and > 1.x |
1.0.0 | 2019-01-25 | updated nodes response handler to match nsq >= 1.x format |
0.0.3 | 2016-05-04 | Another configuration bugfix |
0.0.2 | 2016-05-04 | Bugfix configuration and update to lodash |
0.0.1 | 2015-11-27 | Initial commit |
Initially Generated with generator-mpnodemodule
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The MIT License (MIT)
Copyright © 2015 M. Peter, http://www.tcs.de
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.