cubism - npm Package Compare versions

Comparing version 1.3.0 to 1.4.0

cubism.v1.js

 (function(exports){
-var cubism = exports.cubism = {version: "1.3.0"};
+var cubism = exports.cubism = {version: "1.4.0"};
 var cubism_id = 0;
@@ -188,2 +188,206 @@ function cubism_identity(d) { return d; }
 var cubism_cubeFormatDate = d3.time.format.iso;
+/* librato (http://dev.librato.com/v1/post/metrics) source
+ * If you want to see an example of how to use this source, check: https://gist.github.com/drio/5792680
+ */
+cubism_contextPrototype.librato = function(user, token) {
+  var source      = {},
+      context     = this;
+      auth_string = "Basic " + btoa(user + ":" + token);
+      enable_log  = true,
+      avail_rsts  = [ 1, 60, 900, 3600 ];
+
+  function log(msg) { if (enable_log) console.log(msg); }
+
+  function log_interval(start, stop, step) {
+    log("---------------------- Starting request");
+    log("START: " + new Date(start * 1000));
+    log("STOP : " + new Date(stop * 1000));
+    log("STEP : " + step);
+    var nes_num_mes = (stop - start)/step;
+    log("# of measurements necessary: " + nes_num_mes);
+  }
+
+  /* Given a step, find the best librato resolution to use.
+   *
+   * Example:
+   *
+   * (s) : cubism step
+   *
+   * avail_rsts   1 --------------- 60 --------------- 900 ---------------- 3600
+   *                                |    (s)            |
+   *                                |                   |
+   *                              [low_res             top_res]
+   *
+   * return: low_res (60)
+   */
+  function find_ideal_librato_resolution(step) {
+    var highest_res = avail_rsts[0],
+        lowest_res  = avail_rsts[avail_rsts.length]; // high and lowest available resolution from librato
+
+    /* If step is outside the highest or lowest librato resolution, pick them and we are done */
+    if (step >= lowest_res)
+      return lowest_res;
+
+    if (step <= highest_res)
+      return highest_res;
+
+    /* If not, find in what resolution interval the step lands. */
+    var iof, top_res, i;
+    for (i=step; i<=lowest_res; i++) {
+      iof = avail_rsts.indexOf(i);
+      if (iof > -1) {
+        top_res = avail_rsts[iof];
+        break;
+      }
+    }
+
+    var low_res;
+    for (i=step; i>=highest_res; i--) {
+      iof = avail_rsts.indexOf(i);
+      if (iof > -1) {
+        low_res = avail_rsts[iof];
+        break;
+      }
+    }
+
+    /* What's the closest librato resolution given the step ? */
+    return ((top_res-step) < (step-low_res)) ? top_res : low_res;
+  }
+
+  function find_librato_resolution(sdate, edate, step) {
+    var i_size      = edate - sdate,                 // interval size
+        month       = 2419200,
+        week        = 604800,
+        two_days    = 172800,
+        ideal_res;
+
+    if (i_size > month)
+      return 3600;
+
+    ideal_res = find_ideal_librato_resolution(step);
+
+    /*
+     * Now we have the ideal resolution, but due to the retention policies at librato, maybe we have
+     * to use a higher resolution.
+     * http://support.metrics.librato.com/knowledgebase/articles/66838-understanding-metrics-roll-ups-retention-and-grap
+     */
+    if (i_size > week && ideal_res < 900)
+      return 900;
+    else if (i_size > two_days && ideal_res < 60)
+      return 60;
+    else
+      return ideal_res;
+  }
+
+  /* All the logic to query the librato API is here */
+  var librato_request = function(metric, source) {
+    var url_prefix  = "https://metrics-api.librato.com/v1/metrics";
+
+    function make_url(sdate, edate, step) {
+      var params    = "start_time="  + sdate +
+                      "&end_time="   + edate +
+                      "&resolution=" + find_librato_resolution(sdate, edate, step);
+          full_url  = url_prefix + "/" + metric + "?" + params;
+
+      log("full_url = " + full_url);
+      log_interval(sdate, edate, step);
+      return full_url;
+    }
+
+    /*
+     * We are most likely not going to get the same number of measurements
+     * cubism expects for a particular context: We have to perform down/up
+     * sampling
+     */
+    function down_up_sampling(isdate, iedate, step, librato_mm) {
+      var av = [];
+
+      for (i=isdate; i<=iedate; i+=step) {
+        var int_mes = [];
+        while (librato_mm.length && librato_mm[0].measure_time <= i) {
+          int_mes.push(librato_mm.shift().value);
+        }
+
+        var v;
+        if (int_mes.length) { /* Compute the average */
+          v = int_mes.reduce(function(a, b) { return a + b }) / int_mes.length;
+        } else { /* No librato values on interval */
+          v = (av.length) ? av[av.length-1] : 0;
+        }
+        av.push(v);
+      }
+
+      return av;
+    }
+
+    request = {};
+
+    request.fire = function(isdate, iedate, step, callback_done) {
+      var a_values = []; /* Store partial values from librato */
+
+      /*
+       * Librato has a limit in the number of measurements we get back in a request (100).
+       * We recursively perform requests to the API to ensure we have all the data points
+       * for the interval we are working on.
+       */
+      function actual_request(full_url) {
+        d3.json(full_url)
+          .header("X-Requested-With", "XMLHttpRequest")
+          .header("Authorization", auth_string)
+          .header("Librato-User-Agent", 'cubism/' + cubism.version)
+          .get(function (error, data) { /* Callback; data available */
+            if (!error) {
+              log("# of partial measurements: " + data.measurements[source].length);
+              data.measurements[source].forEach(function(o) { a_values.push(o); });
+
+              var still_more_values = 'query' in data && 'next_time' in data.query;
+              if (still_more_values) {
+                log("Requesting more values");
+                actual_request(make_url(data.query.next_time, iedate, step));
+              } else {
+                log("total number of measurements from librato: " + a_values.length);
+                var a_adjusted = down_up_sampling(isdate, iedate, step, a_values);
+                log("number of measurements after adjusting time values: " + a_adjusted.length);
+                callback_done(a_adjusted);
+              }
+            } else {
+              log("There was an error when performing the librato request:");
+              log(error);
+            }
+          });
+      }
+
+      actual_request(make_url(isdate, iedate, step));
+    };
+
+    return request;
+  };
+
+  /*
+   * The user will use this method to create a cubism source (librato in this case)
+   * and call .metric() as necessary to create metrics.
+   */
+  source.metric = function(m_name, m_source) {
+    return context.metric(function(start, stop, step, callback) {
+      /* All the librato logic is here; .fire() retrieves the metrics' data */
+      librato_request(m_name, m_source)
+        .fire(cubism_libratoFormatDate(start),
+              cubism_libratoFormatDate(stop),
+              cubism_libratoFormatDate(step),
+              function(a_values) { callback(null, a_values); });
+
+      }, m_name += "");
+    };
+
+  /* This is not used when the source is librato */
+  source.toString = function() {
+    return "librato";
+  };
+
+  return source;
+};
+
+var cubism_libratoFormatDate = function(time) {
+  return Math.floor(time / 1000);
+};
 cubism_contextPrototype.graphite = function(host) {
@@ -190,0 +394,0 @@ if (!arguments.length) host = "";

cubism.v1.min.js

@@ -1,1 +0,1 @@
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package.json

 {
   "name": "cubism",
-  "version": "1.3.0",
+  "version": "1.4.0",
   "description": "A JavaScript library for time series visualization.",
@@ -21,3 +21,3 @@ "keywords": [
   "dependencies": {
-    "d3": "2.9.1"
+    "d3": "3.x"
   },
@@ -24,0 +24,0 @@ "devDependencies": {

README.md

 # Cubism.js
 
-Cubism.js is a [D3](http://mbostock.github.com/d3/) plugin for visualizing time series. Use Cubism to construct better realtime dashboards, pulling data from [Graphite](/square/cubism/wiki/Graphite), [Cube](/square/cubism/wiki/Cube) and other sources. Cubism is available under the [Apache License](/square/cubism/blob/master/LICENSE).
+Cubism.js is a [D3](http://d3js.org) plugin for visualizing time series. Use Cubism to construct better realtime dashboards, pulling data from [Graphite](https://github.com/square/cubism/wiki/Graphite), [Cube](https://github.com/square/cubism/wiki/Cube) and other sources. Cubism is available under the [Apache License](LICENSE).
 
 Want to learn more? [See the wiki.](https://github.com/square/cubism/wiki)

src/cubism.js

@@ -1,1 +0,1 @@
-var cubism = exports.cubism = {version: "1.3.0"};
+var cubism = exports.cubism = {version: "1.4.0"};

src/package.js

@@ -1,3 +0,6 @@
-var util = require("util"),
-    d3 = require("d3"),
+var util = require("util");
+
+navigator = {} 
+
+var d3 = require("d3"),
     cubism = require("../cubism.v1").cubism;
@@ -15,3 +18,3 @@
   "dependencies": {
-    "d3": "2.9.1"
+    "d3": "3.x"
   },
@@ -18,0 +21,0 @@ "devDependencies": {

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Improved metrics

Total package byte prevSize

101373

increased by13.83%

Lines of code

2257

increased by13.19%

Worsened metrics

Number of package files

25

decreased by-3.85%

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• Updatedd3@3.x