Github user abellina commented on a diff in the pull request: https://github.com/apache/storm/pull/1451#discussion_r66524810 --- Diff: storm-core/src/ui/public/topology.html --- @@ -384,8 +389,51 @@ <h2 id="topology-resources-header">Topology resources</h2> $('#topology-configuration [data-toggle="tooltip"]').tooltip(); $('#topology-actions [data-toggle="tooltip"]').tooltip(); $('#topology-visualization [data-toggle="tooltip"]').tooltip(); + + var lagUrl = "/api/v1/topology/"+topologyId+"/lag"; + $.getJSON(lagUrl,function(lagResponse,status,jqXHR) { + if (lagResponse !== null && lagResponse !== undefined && lagResponse instanceof Array && lagResponse.length > 0) { + var kafkaSpoutsLagTemplate = $(template).filter("#topology-kafka-spouts-lag-template").html(); + var spoutsErrorTemplate = $(template).filter("#topology-spouts-lag-error-template").html(); + + var kafkaSpoutLags = lagResponse.filter(function(ele) {return ele.spoutType === "KAFKA";}); + var isJson = function (input) { + try { + JSON.parse(input); + } catch (e) { + return false; + } + return true; + }; + var kafkaSpoutsValidResults = kafkaSpoutLags.filter(function (ele) {return isJson(ele.spoutLagResult);}); + var kafkaSpoutsErrorResults = kafkaSpoutLags.filter(function (ele) {return !isJson(ele.spoutLagResult);}); + var data = {}; + if (kafkaSpoutsValidResults.length > 0) { + data.kafkaSpoutsLagResults = []; + kafkaSpoutsValidResults.forEach(function(ele) { + var spoutLagResult = JSON.parse(ele.spoutLagResult); + spoutLagResult.forEach(function(ele2) { --- End diff -- @priyank5485 yes, sorry that was my intention but I didn't write it correctly in my comment, spoutLagResult should be a JSON array. Thanks for the background! That said, I think that TopologySpoutLag should do this (my two cents). That way the output from the rest interface doesn't need further inspection and some other script can call on your new lag endpoint and get a JSON object they use without having to do the extra testing. I am not sure that valid/invalid are the best labels here by the way, just an example I came up with.
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