| /* |
| * Copyright 2017, OpenCensus Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package io.opencensus.contrib.zpages; |
| |
| import static com.google.common.base.Strings.isNullOrEmpty; |
| |
| import com.google.common.base.Charsets; |
| import io.opencensus.trace.config.TraceConfig; |
| import io.opencensus.trace.config.TraceParams; |
| import io.opencensus.trace.samplers.Samplers; |
| import java.io.BufferedWriter; |
| import java.io.OutputStream; |
| import java.io.OutputStreamWriter; |
| import java.io.PrintWriter; |
| import java.util.Map; |
| |
| // TODO(bdrutu): Add tests. |
| // TODO(hailongwen): Remove the usage of `NetworkEvent` in the future. |
| /** |
| * HTML page formatter for tracing config. The page displays information about the current active |
| * tracing configuration and allows users to change it. |
| */ |
| final class TraceConfigzZPageHandler extends ZPageHandler { |
| private static final String TRACE_CONFIGZ_URL = "/traceconfigz"; |
| private final TraceConfig traceConfig; |
| |
| private static final String CHANGE = "change"; |
| private static final String PERMANENT_CHANGE = "permanently"; |
| private static final String RESTORE_DEFAULT_CHANGE = "restore_default"; |
| private static final String QUERY_COMPONENT_SAMPLING_PROBABILITY = "samplingprobability"; |
| private static final String QUERY_COMPONENT_MAX_NUMBER_OF_ATTRIBUTES = "maxnumberofattributes"; |
| private static final String QUERY_COMPONENT_MAX_NUMBER_OF_ANNOTATIONS = "maxnumberofannotations"; |
| private static final String QUERY_COMPONENT_MAX_NUMBER_OF_NETWORK_EVENTS = |
| "maxnumberofnetworkevents"; |
| private static final String QUERY_COMPONENT_MAX_NUMBER_OF_LINKS = "maxnumberoflinks"; |
| |
| // TODO(bdrutu): Use post. |
| // TODO(bdrutu): Refactor this to not use a big "printf". |
| private static final String TRACECONFIGZ_FORM_BODY = |
| "<form action=/traceconfigz method=get>%n" |
| // Permanently changes table. |
| + "<table class=\"small\" rules=\"all\">%n" |
| + "<td colspan=\"3\" class=\"col_head\">Permanently change " |
| + "<input type=\"hidden\" name=\"%s\" value=\"%s\"></td>%n" |
| + "<tr><td>SamplingProbability to</td> " |
| + "<td><input type=text size=15 name=%s value=\"\"></td> <td>(%s)</td>%n" |
| + "<tr><td>MaxNumberOfAttributes to</td> " |
| + "<td><input type=text size=15 name=%s value=\"\"></td> <td>(%d)</td>%n" |
| + "<tr><td>MaxNumberOfAnnotations to</td>" |
| + "<td><input type=text size=15 name=%s value=\"\"></td> <td>(%d)</td>%n" |
| + "<tr><td>MaxNumberOfNetworkEvents to</td> " |
| + "<td><input type=text size=15 name=%s value=\"\"></td> <td>(%d)</td>%n" |
| + "<tr><td>MaxNumberOfLinks to</td>" |
| + "<td><input type=text size=15 name=%s value=\"\"></td> <td>(%d)</td>%n" |
| + "</table>%n" |
| // Submit button. |
| + "<input class=\"button\" type=submit value=Submit>%n" |
| + "</form>"; |
| |
| private static final String RESTORE_DEFAULT_FORM_BODY = |
| "<form action=/traceconfigz method=get>%n" |
| // Restore to default. |
| + "<b class=\"title\">Restore default</b> %n" |
| + "<input type=\"hidden\" name=\"%s\" value=\"%s\"></td>%n" |
| + "</br>%n" |
| // Reset button. |
| + "<input class=\"button\" type=submit value=Reset>%n" |
| + "</form>"; |
| |
| static TraceConfigzZPageHandler create(TraceConfig traceConfig) { |
| return new TraceConfigzZPageHandler(traceConfig); |
| } |
| |
| @Override |
| public String getUrlPath() { |
| return TRACE_CONFIGZ_URL; |
| } |
| |
| private static void emitStyle(PrintWriter out) { |
| out.write("<style>\n"); |
| out.write(Style.style); |
| out.write("</style>\n"); |
| } |
| |
| @Override |
| @SuppressWarnings("deprecation") |
| public void emitHtml(Map<String, String> queryMap, OutputStream outputStream) { |
| PrintWriter out = |
| new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream, Charsets.UTF_8))); |
| out.write("<!DOCTYPE html>\n"); |
| out.write("<html lang=\"en\"><head>\n"); |
| out.write("<meta charset=\"utf-8\">\n"); |
| out.write("<title>TraceConfigZ</title>\n"); |
| out.write("<link rel=\"shortcut icon\" href=\"https://opencensus.io/images/favicon.ico\"/>\n"); |
| out.write( |
| "<link href=\"https://fonts.googleapis.com/css?family=Open+Sans:300\"" |
| + "rel=\"stylesheet\">\n"); |
| out.write( |
| "<link href=\"https://fonts.googleapis.com/css?family=Roboto\"" + "rel=\"stylesheet\">\n"); |
| emitStyle(out); |
| out.write("</head>\n"); |
| out.write("<body>\n"); |
| out.write( |
| "<p class=\"header\">" |
| + "<img class=\"oc\" src=\"https://opencensus.io/img/logo-sm.svg\" />" |
| + "Open<span>Census</span></p>"); |
| out.write("<h1 class=\"left\">Trace Configuration</h1>"); |
| out.write("<p></p>"); |
| try { |
| // Work that can throw exceptions. |
| maybeApplyChanges(queryMap); |
| } finally { |
| // TODO(bdrutu): Maybe display to the page if an exception happened. |
| // Display the page in any case. |
| out.printf( |
| TRACECONFIGZ_FORM_BODY, |
| CHANGE, |
| PERMANENT_CHANGE, |
| QUERY_COMPONENT_SAMPLING_PROBABILITY, |
| "0.0001", // TODO(bdrutu): Get this from the default sampler (if possible). |
| QUERY_COMPONENT_MAX_NUMBER_OF_ATTRIBUTES, |
| TraceParams.DEFAULT.getMaxNumberOfAttributes(), |
| QUERY_COMPONENT_MAX_NUMBER_OF_ANNOTATIONS, |
| TraceParams.DEFAULT.getMaxNumberOfAnnotations(), |
| QUERY_COMPONENT_MAX_NUMBER_OF_NETWORK_EVENTS, |
| TraceParams.DEFAULT.getMaxNumberOfNetworkEvents(), |
| QUERY_COMPONENT_MAX_NUMBER_OF_LINKS, |
| TraceParams.DEFAULT.getMaxNumberOfLinks()); |
| out.write("<br>\n"); |
| out.printf(RESTORE_DEFAULT_FORM_BODY, CHANGE, RESTORE_DEFAULT_CHANGE); |
| out.write("<br>\n"); |
| emitTraceParamsTable(traceConfig.getActiveTraceParams(), out); |
| out.write("</body>\n"); |
| out.write("</html>\n"); |
| out.close(); |
| } |
| } |
| |
| // If this is a supported change (currently only permanent changes are supported) apply it. |
| @SuppressWarnings("deprecation") |
| private void maybeApplyChanges(Map<String, String> queryMap) { |
| String changeStr = queryMap.get(CHANGE); |
| if (PERMANENT_CHANGE.equals(changeStr)) { |
| TraceParams.Builder traceParamsBuilder = traceConfig.getActiveTraceParams().toBuilder(); |
| String samplingProbabilityStr = queryMap.get(QUERY_COMPONENT_SAMPLING_PROBABILITY); |
| if (!isNullOrEmpty(samplingProbabilityStr)) { |
| double samplingProbability = Double.parseDouble(samplingProbabilityStr); |
| traceParamsBuilder.setSampler(Samplers.probabilitySampler(samplingProbability)); |
| } |
| String maxNumberOfAttributesStr = queryMap.get(QUERY_COMPONENT_MAX_NUMBER_OF_ATTRIBUTES); |
| if (!isNullOrEmpty(maxNumberOfAttributesStr)) { |
| int maxNumberOfAttributes = Integer.parseInt(maxNumberOfAttributesStr); |
| traceParamsBuilder.setMaxNumberOfAttributes(maxNumberOfAttributes); |
| } |
| String maxNumberOfAnnotationsStr = queryMap.get(QUERY_COMPONENT_MAX_NUMBER_OF_ANNOTATIONS); |
| if (!isNullOrEmpty(maxNumberOfAnnotationsStr)) { |
| int maxNumberOfAnnotations = Integer.parseInt(maxNumberOfAnnotationsStr); |
| traceParamsBuilder.setMaxNumberOfAnnotations(maxNumberOfAnnotations); |
| } |
| String maxNumberOfNetworkEventsStr = |
| queryMap.get(QUERY_COMPONENT_MAX_NUMBER_OF_NETWORK_EVENTS); |
| if (!isNullOrEmpty(maxNumberOfNetworkEventsStr)) { |
| int maxNumberOfNetworkEvents = Integer.parseInt(maxNumberOfNetworkEventsStr); |
| traceParamsBuilder.setMaxNumberOfNetworkEvents(maxNumberOfNetworkEvents); |
| } |
| String maxNumverOfLinksStr = queryMap.get(QUERY_COMPONENT_MAX_NUMBER_OF_LINKS); |
| if (!isNullOrEmpty(maxNumverOfLinksStr)) { |
| int maxNumberOfLinks = Integer.parseInt(maxNumverOfLinksStr); |
| traceParamsBuilder.setMaxNumberOfLinks(maxNumberOfLinks); |
| } |
| traceConfig.updateActiveTraceParams(traceParamsBuilder.build()); |
| } else if (RESTORE_DEFAULT_CHANGE.equals(changeStr)) { |
| traceConfig.updateActiveTraceParams(TraceParams.DEFAULT); |
| } |
| } |
| |
| // Prints a table to a PrintWriter that shows existing trace parameters. |
| @SuppressWarnings("deprecation") |
| private static void emitTraceParamsTable(TraceParams params, PrintWriter out) { |
| out.write( |
| "<b class=\"title\">Active tracing parameters:</b><br>\n" |
| + "<table class=\"small\" rules=\"all\">\n" |
| + " <tr>\n" |
| + " <td class=\"col_headR\">Name</td>\n" |
| + " <td class=\"col_head\">Value</td>\n" |
| + " </tr>\n"); |
| out.printf( |
| " <tr>%n <td>Sampler</td>%n <td>%s</td>%n </tr>%n", |
| params.getSampler().getDescription()); |
| out.printf( |
| " <tr>%n <td>MaxNumberOfAttributes</td>%n <td>%d</td>%n </tr>%n", |
| params.getMaxNumberOfAttributes()); |
| out.printf( |
| " <tr>%n <td>MaxNumberOfAnnotations</td>%n <td>%d</td>%n </tr>%n", |
| params.getMaxNumberOfAnnotations()); |
| out.printf( |
| " <tr>%n <td>MaxNumberOfNetworkEvents</td>%n <td>%d</td>%n </tr>%n", |
| params.getMaxNumberOfNetworkEvents()); |
| out.printf( |
| " <tr>%n <td>MaxNumberOfLinks</td>%n <td>%d</td>%n </tr>%n", |
| params.getMaxNumberOfLinks()); |
| |
| out.write("</table>\n"); |
| } |
| |
| private TraceConfigzZPageHandler(TraceConfig traceConfig) { |
| this.traceConfig = traceConfig; |
| } |
| } |