| || | |) | / | | | | (| | (| |) |
_/| ./ ___|| ||| _,|_,|___/
|_|
Function created in folder: faas-currenttime
Stack file written: faas-currenttime.yml
Notes:
You have created a function using the java11 template which uses an LTS
version of the OpenJDK.
-
当前目录已经新增了文件faas-currenttime.yml和文件夹faas-currenttime
-
文件夹faas-currenttime的内容如下，可见是个gradle工程：
faas-currenttime
├── build.gradle
├── gradle
│ └── wrapper
│ ├── gradle-wrapper.jar
│ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
├── settings.gradle
└── src
├── main
│ └── java
│ └── com
│ └── openfaas
│ └── function
│ └── Handler.java
└── test
└── java
└── HandlerTest.java
- 打开build.gradle文件，添加下图红框中的内容，即jackson和common库的依赖：
- 进入文件夹faas-currenttime/src/main/java/com/openfaas/function/，可见已创建了默认的业务功能类Handler.java，打开看看OpenFaaS给的默认代码啥样的，如下所示：
package com.openfaas.function;
import com.openfaas.model.IHandler;
import com.openfaas.model.IResponse;
import com.openfaas.model.IRequest;
import com.openfaas.model.Response;
public class Handler extends com.openfaas.model.AbstractHandler {
public IResponse Handle(IRequest req) {
Response res = new Response();
res.setBody(“Hello, world!”);
return res;
}
}
- 把Handler.java的内容用以下代码替换掉，替换后的函数，其功能是取得请求参数，再把当前JVM的进程ID、IP地址、当前时间都拼接到一个字符串中返回，需要重点关注的有两点：将请求参数反序列化成Map实例，以及将Map序列化成JSON字符串返回：
package com.openfaas.function;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.openfaas.model.IRequest;
import com.openfaas.model.IResponse;
import com.openfaas.model.Response;
import org.apache.commons.lang3.StringUtils;
import java.lang.management.ManagementFactory;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
public class Handler extends com.openfaas.model.AbstractHandler {
private static final String PARAM_USER_NAME = “name”;
private static final String RESPONSE_TEMPLETE = “Hello %s, response from [%s], PID [%s], %s”;
private ObjectMapper mapper = new ObjectMapper();
public static String getIpAddress() {
try {
Enumeration allNetInterfaces = NetworkInterface.getNetworkInterfaces();
InetAddress ip = null;
while (allNetInterfaces.hasMoreElements()) {
NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
if (netInterface.isLoopback() || netInterface.isVirtual() || !netInterface.isUp()) {
continue;
} else {
Enumeration addresses = netInterface.getInetAddresses();
while (addresses.hasMoreElements()) {
ip = addresses.nextElement();
if (ip != null && ip instanceof Inet4Address) {
return ip.getHostAddress();
}
}
}
}
} catch (Exception e) {
System.err.println(“IP地址获取失败” + e.toString());
}
return “”;
}
private static String getPID() {
return Manage
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mentFactory
.getRuntimeMXBean()
.getName()
.split("@")[0];
}
private String getUserName(IRequest req) {
// 如果从请求body中取不到userName，就用
String userName = null;
try {
Map
new TypeReference
if(null!=mapFromStr && mapFromStr.containsKey(PARAM_USER_NAME)) {
userName = String.valueOf(mapFromStr.get(PARAM_USER_NAME));
}
} catch (Exception e) {
e.printStackTrace();
}
// 如果从请求body中取不到userName，就给个默认值
if(StringUtils.isBlank(userName)) {
userName = “anonymous”;
}
return userName;
}
public IResponse Handle(IRequest req) {
String userName = getUserName(req);
System.out.println(“1. —” + userName);
// 返回信息带上当前JVM所在机器的IP、进程号、时间
String message = String.format(RESPONSE_TEMPLETE,
userName,
getIpAddress(),
getPID(),
new SimpleDateFormat( “yyyy-MM-dd hh:mm:ss” ).format(new Date()));
System.out.println(“2. —” + message);
// 响应内容也是JSON格式，所以先存入map，然后再序列化
Map
rlt.put(“success”, true);
rlt.put(“message”, message);
String rltStr = null;
try {
rltStr = mapper.writevalueAsString(rlt);
} catch (Exception e) {
e.printStackTrace();
}
Response res = new Response();
res.setContentType(“application/json;charset=utf-8”);
res.setBody(rltStr);
return res;
}
}
- 至此编码完成，接下来是制作镜像和部署；
- 在faas-currenttime.yml所在目录执行以下命令，即可开始制作镜像，制作过程中会有gradle的编译过程，如果编译失败会中断镜像制作：
faas-cli build -f ./faas-currenttime.yml
- 镜像制作成功时，控制台输出类似如下信息：
Step 27/30 : ENV fprocess=“java -XX:+UseContainerSupport com.openfaas.entrypoint.App”
—> Running in 0f50636cc747
Removing intermediate container 0f50636cc747
—> 54a5c9a193c8
Step 28/30 : EXPOSE 8080
—> Running in 3252f165af15
Removing intermediate container 3252f165af15
—> c05afc826ec5
Step 29/30 : HEALTHCHECK --interval=5s CMD [ -e /tmp/.lock ] || exit 1
—> Running in 4106410be0a2
Removing intermediate container 4106410be0a2
—> 6d95b73b5f33
Step 30/30 : CMD [“fwatchdog”]
—> Running in 1606dbcd7003
Removing intermediate container 1606dbcd7003
—> 99a519ab82fd
Successfully built 99a519ab82fd
Successfully tagged bolingcavalry/faas-currenttime:latest
Image: bolingcavalry/faas-currenttime:latest built.
[0] < Building faas-currenttime done in 34.94s.
[0] Worker done.
Total build time: 34.94s
- 将镜像推送到镜像仓库，以便Kubernetes可以下载到此镜像，我这里用的是hub.docker.com，因为我的ID是bolingcavalry，所执行以下命令即可推送成功：
docker push bolingcavalry/faas-currenttime:latest
- 执行以下命令部署函数到OpenFaaS：
faas-cli deploy -f faas-currenttime.yml
- 控制台响应如下，可见部署已经开始，并且给出了endpoint：
[root@node1 20]# faas-cli deploy -f faas-currenttime.yml
Deploying: faas-currenttime.
WARNING! Communication is not secure, please consider using HTTPS. Letsencrypt.org offers free SSL/TLS certificates.
Deployed. 202 Accepted.
