Add http example (#695)
* Add build scripts for HTTP example Add HTTP example Improved naming and formatting Add Semantic Convention to traces Fix semantic convention * Add Examples as OpenTelementry project * Changed the build configuration - Examples are compiled with the main project * Addressing comment of @carlosalberto * Addressed the feedback of @bogdandrutu * Removed InMemory exporter. Example as standalone project. * Remove examples from main build * Making the exporter private and static Change visibility of attributes * Update HTTP example README * Apply java format Co-authored-by: Inseo Kim <sano307@naver.com>
This commit is contained in:
Giovanni Liva
GitHub
parent
465664cddc
commit
2d892444d1
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# HTTP Example
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**Note:** This is an advanced scenario useful for people that want to *manually* instrument their own code.
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This is a simple example that demonstrates how to use the OpenTelemetry SDK
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to *manually* instrument a simple HTTP based Client/Server application.
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The example creates the **Root Span** on the client and sends the context
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over the HTTP request. On the server side, the example shows how to extract the context
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and create a **Child Span** with attached a **Span Event**.
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# How to run
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## Prerequisites
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* Java 1.8.231
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* Be on the project root folder
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## 1 - Compile
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```bash
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gradlew fatJar
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```
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## 2 - Start the Server
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```bash
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java -cp ./build/libs/opentelemetry-example-http-all-0.2.0.jar io.opentelemetry.example.http.HttpServer
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```
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## 3 - Start the Client
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```bash
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java -cp ./build/libs/opentelemetry-example-http-all-0.2.0.jar io.opentelemetry.example.http.HttpClient
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```
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plugins {
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id 'java'
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}
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group 'io.opentelemetry'
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version '0.2.0'
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//create a single Jar with all dependencies
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task fatJar(type: Jar) {
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baseName = project.name + '-all'
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from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
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with jar
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}
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repositories {
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mavenCentral()
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}
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dependencies {
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compile('io.opentelemetry:opentelemetry-api:0.2.0')
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compile('io.opentelemetry:opentelemetry-sdk:0.2.0')
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compile('io.opentelemetry:opentelemetry-exporters-logging:0.2.0')
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compile('io.grpc:grpc-protobuf:1.24.0')
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compile('io.grpc:grpc-netty-shaded:1.24.0')
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testCompile group: 'junit', name: 'junit', version: '4.12'
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}
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Binary file not shown.
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#Fri Dec 06 12:31:29 CET 2019
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distributionUrl=https\://services.gradle.org/distributions/gradle-5.2.1-all.zip
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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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zipStorePath=wrapper/dists
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zipStoreBase=GRADLE_USER_HOME
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@ -0,0 +1,172 @@
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#!/usr/bin/env sh
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##############################################################################
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##
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## Gradle start up script for UN*X
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##
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##############################################################################
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# Attempt to set APP_HOME
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# Resolve links: $0 may be a link
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PRG="$0"
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# Need this for relative symlinks.
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while [ -h "$PRG" ] ; do
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ls=`ls -ld "$PRG"`
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link=`expr "$ls" : '.*-> \(.*\)$'`
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if expr "$link" : '/.*' > /dev/null; then
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PRG="$link"
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else
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PRG=`dirname "$PRG"`"/$link"
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fi
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done
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SAVED="`pwd`"
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cd "`dirname \"$PRG\"`/" >/dev/null
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APP_HOME="`pwd -P`"
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cd "$SAVED" >/dev/null
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APP_NAME="Gradle"
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APP_BASE_NAME=`basename "$0"`
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# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
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DEFAULT_JVM_OPTS='"-Xmx64m"'
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# Use the maximum available, or set MAX_FD != -1 to use that value.
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MAX_FD="maximum"
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warn () {
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echo "$*"
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}
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die () {
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echo
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echo "$*"
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echo
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exit 1
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}
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# OS specific support (must be 'true' or 'false').
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cygwin=false
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msys=false
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darwin=false
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nonstop=false
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case "`uname`" in
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CYGWIN* )
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cygwin=true
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;;
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Darwin* )
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darwin=true
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;;
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MINGW* )
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msys=true
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;;
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NONSTOP* )
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nonstop=true
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;;
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esac
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CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
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# Determine the Java command to use to start the JVM.
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if [ -n "$JAVA_HOME" ] ; then
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if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
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# IBM's JDK on AIX uses strange locations for the executables
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JAVACMD="$JAVA_HOME/jre/sh/java"
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else
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JAVACMD="$JAVA_HOME/bin/java"
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fi
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if [ ! -x "$JAVACMD" ] ; then
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die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
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Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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fi
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else
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JAVACMD="java"
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which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
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Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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fi
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# Increase the maximum file descriptors if we can.
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if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
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MAX_FD_LIMIT=`ulimit -H -n`
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if [ $? -eq 0 ] ; then
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if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
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MAX_FD="$MAX_FD_LIMIT"
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fi
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ulimit -n $MAX_FD
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if [ $? -ne 0 ] ; then
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warn "Could not set maximum file descriptor limit: $MAX_FD"
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fi
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else
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warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
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fi
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fi
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# For Darwin, add options to specify how the application appears in the dock
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if $darwin; then
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GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
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fi
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# For Cygwin, switch paths to Windows format before running java
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if $cygwin ; then
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APP_HOME=`cygpath --path --mixed "$APP_HOME"`
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CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
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JAVACMD=`cygpath --unix "$JAVACMD"`
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# We build the pattern for arguments to be converted via cygpath
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ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
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SEP=""
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for dir in $ROOTDIRSRAW ; do
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ROOTDIRS="$ROOTDIRS$SEP$dir"
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SEP="|"
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done
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OURCYGPATTERN="(^($ROOTDIRS))"
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# Add a user-defined pattern to the cygpath arguments
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if [ "$GRADLE_CYGPATTERN" != "" ] ; then
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OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
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fi
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# Now convert the arguments - kludge to limit ourselves to /bin/sh
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i=0
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for arg in "$@" ; do
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CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
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CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
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if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
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eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
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else
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eval `echo args$i`="\"$arg\""
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fi
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i=$((i+1))
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done
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case $i in
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(0) set -- ;;
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(1) set -- "$args0" ;;
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(2) set -- "$args0" "$args1" ;;
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(3) set -- "$args0" "$args1" "$args2" ;;
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(4) set -- "$args0" "$args1" "$args2" "$args3" ;;
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(5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
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(6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
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(7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
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(8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
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(9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
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esac
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fi
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# Escape application args
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save () {
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for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
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echo " "
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}
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APP_ARGS=$(save "$@")
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# Collect all arguments for the java command, following the shell quoting and substitution rules
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eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
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# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
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if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
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cd "$(dirname "$0")"
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fi
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exec "$JAVACMD" "$@"
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@ -0,0 +1,84 @@
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@if "%DEBUG%" == "" @echo off
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@rem ##########################################################################
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@rem
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@rem Gradle startup script for Windows
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@rem
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@rem ##########################################################################
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@rem Set local scope for the variables with windows NT shell
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if "%OS%"=="Windows_NT" setlocal
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set DIRNAME=%~dp0
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if "%DIRNAME%" == "" set DIRNAME=.
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set APP_BASE_NAME=%~n0
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set APP_HOME=%DIRNAME%
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@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
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set DEFAULT_JVM_OPTS="-Xmx64m"
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@rem Find java.exe
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if defined JAVA_HOME goto findJavaFromJavaHome
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set JAVA_EXE=java.exe
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%JAVA_EXE% -version >NUL 2>&1
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if "%ERRORLEVEL%" == "0" goto init
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echo.
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echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
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echo.
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echo Please set the JAVA_HOME variable in your environment to match the
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echo location of your Java installation.
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goto fail
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:findJavaFromJavaHome
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set JAVA_HOME=%JAVA_HOME:"=%
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set JAVA_EXE=%JAVA_HOME%/bin/java.exe
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if exist "%JAVA_EXE%" goto init
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echo.
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echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
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echo.
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echo Please set the JAVA_HOME variable in your environment to match the
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echo location of your Java installation.
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goto fail
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:init
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@rem Get command-line arguments, handling Windows variants
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if not "%OS%" == "Windows_NT" goto win9xME_args
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:win9xME_args
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@rem Slurp the command line arguments.
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set CMD_LINE_ARGS=
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set _SKIP=2
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:win9xME_args_slurp
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if "x%~1" == "x" goto execute
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set CMD_LINE_ARGS=%*
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:execute
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@rem Setup the command line
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set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
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@rem Execute Gradle
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"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
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:end
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@rem End local scope for the variables with windows NT shell
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if "%ERRORLEVEL%"=="0" goto mainEnd
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:fail
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rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
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rem the _cmd.exe /c_ return code!
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if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
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exit /b 1
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:mainEnd
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if "%OS%"=="Windows_NT" endlocal
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:omega
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@ -0,0 +1,2 @@
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rootProject.name = 'opentelemetry-example-http'
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@ -0,0 +1,135 @@
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/*
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* Copyright 2019, OpenTelemetry Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.opentelemetry.example.http;
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import io.opentelemetry.OpenTelemetry;
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import io.opentelemetry.context.propagation.HttpTextFormat;
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import io.opentelemetry.exporters.logging.LoggingExporter;
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import io.opentelemetry.sdk.OpenTelemetrySdk;
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import io.opentelemetry.sdk.trace.TracerSdkFactory;
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import io.opentelemetry.sdk.trace.export.SimpleSpansProcessor;
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import io.opentelemetry.trace.Span;
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import io.opentelemetry.trace.Status;
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import io.opentelemetry.trace.Tracer;
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.nio.charset.Charset;
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public class HttpClient {
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// OTel API
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private static Tracer tracer =
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OpenTelemetry.getTracerFactory().get("io.opentelemetry.example.http.HttpClient");
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// Export traces to log
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private static LoggingExporter loggingExporter = new LoggingExporter();
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// Inject the span context into the request
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private static HttpTextFormat.Setter<HttpURLConnection> setter =
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new HttpTextFormat.Setter<HttpURLConnection>() {
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@Override
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public void put(HttpURLConnection carrier, String key, String value) {
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carrier.setRequestProperty(key, value);
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}
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};
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private void initTracer() {
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// Get the tracer
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TracerSdkFactory tracerFactory = OpenTelemetrySdk.getTracerFactory();
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// Show that multiple exporters can be used
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// Set to export the traces also to a log file
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tracerFactory.addSpanProcessor(SimpleSpansProcessor.newBuilder(loggingExporter).build());
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}
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private HttpClient() throws Exception {
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initTracer();
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// Connect to the server locally
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int port = 8080;
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URL url = new URL("http://127.0.0.1:" + port);
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HttpURLConnection con = (HttpURLConnection) url.openConnection();
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// Name convention for the Span is not yet defined.
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// See: https://github.com/open-telemetry/opentelemetry-specification/issues/270
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Span span = tracer.spanBuilder("/").setSpanKind(Span.Kind.CLIENT).startSpan();
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// TODO provide semantic convention attributes to Span.Builder
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span.setAttribute("component", "http");
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span.setAttribute("http.method", "GET");
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/*
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Only one of the following is required:
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- http.url
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- http.scheme, http.host, http.target
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- http.scheme, peer.hostname, peer.port, http.target
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- http.scheme, peer.ip, peer.port, http.target
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*/
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span.setAttribute("http.url", url.toString());
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// Inject the request with the context
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tracer.getHttpTextFormat().inject(span.getContext(), con, setter);
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StringBuilder content = new StringBuilder();
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int status = 0;
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try {
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// Process the request
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con.setRequestMethod("GET");
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status = con.getResponseCode();
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BufferedReader in =
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new BufferedReader(new InputStreamReader(con.getInputStream(), Charset.defaultCharset()));
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String inputLine;
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while ((inputLine = in.readLine()) != null) {
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content.append(inputLine);
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}
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in.close();
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// Close the Span
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span.setStatus(Status.OK);
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} catch (Exception e) {
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// TODO create mapping for Http Error Codes <-> io.opentelemetry.trace.Status
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span.setStatus(Status.UNKNOWN.withDescription("HTTP Code: " + status));
|
||||
}
|
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span.end();
|
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|
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// Output the result of the request
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System.out.println("Response Code: " + status);
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System.out.println("Response Msg: " + content);
|
||||
}
|
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|
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/**
|
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* Main method to run the example.
|
||||
*
|
||||
* @param args It is not required.
|
||||
*/
|
||||
public static void main(String[] args) {
|
||||
// Perform request every 5s
|
||||
Thread t =
|
||||
new Thread() {
|
||||
@Override
|
||||
public void run() {
|
||||
while (true) {
|
||||
try {
|
||||
HttpClient c = new HttpClient();
|
||||
Thread.sleep(5000);
|
||||
} catch (Exception e) {
|
||||
System.out.println(e.getMessage());
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
t.start();
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,160 @@
|
|||
/*
|
||||
* Copyright 2019, OpenTelemetry 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.opentelemetry.example.http;
|
||||
|
||||
import com.sun.net.httpserver.HttpExchange;
|
||||
import com.sun.net.httpserver.HttpHandler;
|
||||
import io.opentelemetry.OpenTelemetry;
|
||||
import io.opentelemetry.context.propagation.HttpTextFormat;
|
||||
import io.opentelemetry.exporters.logging.LoggingExporter;
|
||||
import io.opentelemetry.sdk.OpenTelemetrySdk;
|
||||
import io.opentelemetry.sdk.trace.TracerSdkFactory;
|
||||
import io.opentelemetry.sdk.trace.export.SimpleSpansProcessor;
|
||||
import io.opentelemetry.trace.*;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.io.OutputStream;
|
||||
import java.net.InetSocketAddress;
|
||||
import java.nio.charset.Charset;
|
||||
import java.util.HashMap;
|
||||
import java.util.Map;
|
||||
|
||||
public class HttpServer {
|
||||
|
||||
private class HelloHandler implements HttpHandler {
|
||||
|
||||
@Override
|
||||
public void handle(HttpExchange he) throws IOException {
|
||||
// Name convention for the Span is not yet defined.
|
||||
// See: https://github.com/open-telemetry/opentelemetry-specification/issues/270
|
||||
Span.Builder spanBuilder = tracer.spanBuilder("/").setSpanKind(Span.Kind.SERVER);
|
||||
Span span = null;
|
||||
try {
|
||||
// Extract the context from the HTTP request
|
||||
SpanContext ctx = tracer.getHttpTextFormat().extract(he, getter);
|
||||
// Rebuild a span with the received context
|
||||
span = spanBuilder.setParent(ctx).startSpan();
|
||||
} catch (StringIndexOutOfBoundsException e) {
|
||||
// msg without ctx
|
||||
span = spanBuilder.startSpan();
|
||||
}
|
||||
// Set the Semantic Convention
|
||||
span.setAttribute("component", "http");
|
||||
span.setAttribute("http.method", "GET");
|
||||
/*
|
||||
One of the following is required:
|
||||
- http.scheme, http.host, http.target
|
||||
- http.scheme, http.server_name, net.host.port, http.target
|
||||
- http.scheme, net.host.name, net.host.port, http.target
|
||||
- http.url
|
||||
*/
|
||||
span.setAttribute("http.scheme", "http");
|
||||
span.setAttribute("http.host", "localhost:" + HttpServer.port);
|
||||
span.setAttribute("http.target", "/");
|
||||
// Process the request
|
||||
answer(he, span);
|
||||
// Close the span
|
||||
span.end();
|
||||
}
|
||||
|
||||
private void answer(HttpExchange he, Span span) throws IOException {
|
||||
// Generate an Event
|
||||
span.addEvent("Start Processing");
|
||||
|
||||
// Process the request
|
||||
String response = "Hello World!";
|
||||
he.sendResponseHeaders(200, response.length());
|
||||
OutputStream os = he.getResponseBody();
|
||||
os.write(response.getBytes(Charset.defaultCharset()));
|
||||
os.close();
|
||||
System.out.println("Served Client: " + he.getRemoteAddress());
|
||||
|
||||
// Generate an Event with an attribute
|
||||
Map<String, AttributeValue> event = new HashMap<>();
|
||||
event.put("answer", AttributeValue.stringAttributeValue(response));
|
||||
span.addEvent("Finish Processing", event);
|
||||
|
||||
// Everything works fine in this example
|
||||
span.setStatus(Status.OK);
|
||||
}
|
||||
}
|
||||
|
||||
private com.sun.net.httpserver.HttpServer server;
|
||||
private static int port = 8080;
|
||||
|
||||
// OTel API
|
||||
private static Tracer tracer =
|
||||
OpenTelemetry.getTracerFactory().get("io.opentelemetry.example.http.HttpServer");
|
||||
// Export traces to log
|
||||
private static LoggingExporter loggingExporter = new LoggingExporter();
|
||||
// Extract the context from http headers
|
||||
private static HttpTextFormat.Getter<HttpExchange> getter =
|
||||
new HttpTextFormat.Getter<HttpExchange>() {
|
||||
@Override
|
||||
public String get(HttpExchange carrier, String key) {
|
||||
if (carrier.getRequestHeaders().containsKey(key)) {
|
||||
return carrier.getRequestHeaders().get(key).get(0);
|
||||
}
|
||||
return "";
|
||||
}
|
||||
};
|
||||
|
||||
private HttpServer() throws IOException {
|
||||
this(port);
|
||||
}
|
||||
|
||||
private HttpServer(int port) throws IOException {
|
||||
initTracer();
|
||||
server = com.sun.net.httpserver.HttpServer.create(new InetSocketAddress(port), 0);
|
||||
// Test urls
|
||||
server.createContext("/", new HelloHandler());
|
||||
server.start();
|
||||
System.out.println("Server ready on http://127.0.0.1:" + port);
|
||||
}
|
||||
|
||||
private void initTracer() {
|
||||
// Get the tracer
|
||||
TracerSdkFactory tracerFactory = OpenTelemetrySdk.getTracerFactory();
|
||||
// Show that multiple exporters can be used
|
||||
|
||||
// Set to export the traces also to a log file
|
||||
tracerFactory.addSpanProcessor(SimpleSpansProcessor.newBuilder(loggingExporter).build());
|
||||
}
|
||||
|
||||
private void stop() {
|
||||
server.stop(0);
|
||||
}
|
||||
|
||||
/**
|
||||
* Main method to run the example.
|
||||
*
|
||||
* @param args It is not required.
|
||||
* @throws Exception Something might go wrong.
|
||||
*/
|
||||
public static void main(String[] args) throws Exception {
|
||||
final HttpServer s = new HttpServer();
|
||||
// Gracefully close the server
|
||||
Runtime.getRuntime()
|
||||
.addShutdownHook(
|
||||
new Thread() {
|
||||
@Override
|
||||
public void run() {
|
||||
s.stop();
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue