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由用户创建及管理Arthas会话，适用于复杂的交互过程。访问流程如下：
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* 创建会话
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* 加入会话(可选）
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* 拉取命令结果
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* 执行一系列命令
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* 中断命令执行
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* 关闭会话
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#### 创建会话
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创建会话, 保存输出到bash环境变量
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`session_data=$(curl -Ss -XPOST http://localhost:8563/api -d '
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{
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"action":"init_session"
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}
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')
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echo $session_data | json_pp`{{execute T3}}
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注： `json_pp` 工具将输出内容格式化为pretty json。
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响应结果：
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```json
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{
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"sessionId" : "b09f1353-202c-407b-af24-701b744f971e",
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"consumerId" : "5ae4e5fbab8b4e529ac404f260d4e2d1_1",
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"state" : "SUCCEEDED"
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}
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```
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提取会话ID和消费者ID。
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当前会话ID为：
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`session_id=$(echo $session_data | sed 's/.*"sessionId":"\([^"]*\)".*/\1/g')
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echo $session_id`{{execute T3}}
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`b09f1353-202c-407b-af24-701b744f971e`;
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请记下这里的会话ID，在Terminal 4中需要手动输入。
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当前消费者ID为：
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`consumer_id=$(echo $session_data | sed 's/.*"consumerId":"\([^"]*\)".*/\1/g')
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echo $consumer_id`{{execute T3}}
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`5ae4e5fbab8b4e529ac404f260d4e2d1_1 `。
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#### 加入会话
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指定要加入的会话ID，服务端将分配一个新的消费者ID。多个消费者可以接收到同一个会话的命令结果。本接口用于支持多人共享同一个会话或刷新页面后重新拉取会话历史记录。
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加入会话，保存输出到bash环境变量
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`session_data=$(curl -Ss -XPOST http://localhost:8563/api -d '
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{
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"action":"join_session",
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"sessionId" : "'"$session_id"'"
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}
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')
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echo $session_data | json_pp`{{execute T3}}
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响应结果：
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```json
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{
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"consumerId" : "8f7f6ad7bc2d4cb5aa57a530927a95cc_2",
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"sessionId" : "b09f1353-202c-407b-af24-701b744f971e",
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"state" : "SUCCEEDED"
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}
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```
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提取消费者ID。
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新的消费者ID为
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`consumer_id=$(echo $session_data | sed 's/.*"consumerId":"\([^"]*\)".*/\1/g')
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echo $consumer_id`{{execute T3}}
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`8f7f6ad7bc2d4cb5aa57a530927a95cc_2 ` 。
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请记下这里的消费者ID，在Terminal 4中需要手动输入。
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#### 拉取命令结果
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拉取命令结果消息的action为`pull_results`。请使用Http long-polling方式，定时循环拉取结果消息。
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消费者的超时时间为5分钟，超时后需要调用`join_session`分配新的消费者。每个消费者单独分配一个缓存队列，按顺序拉取命令结果，不会影响到其它消费者。
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请求参数需要指定会话ID及消费者ID:
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`curl -Ss -XPOST http://localhost:8563/api -d '
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{
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"action":"pull_results",
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"sessionId" : "'"$session_id"'",
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"consumerId" : "'"$consumer_id"'"
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}
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' | json_pp`{{execute T3}}
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用Bash脚本定时拉取结果消息:
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请在Terminal 4中输入Terminal 3中的会话ID，这里的例子如下：
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`b09f1353-202c-407b-af24-701b744f971e`
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`echo -n "Enter your sessionId in T3:"
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read session_id`{{execute T4}}
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同样，接着输入Terminal 3中的消费者ID，这里的例子如下：
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`8f7f6ad7bc2d4cb5aa57a530927a95cc_2 `
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`echo -n "Enter your consumerId in T3:"
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read consumer_id`{{execute T4}}
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`while true; do curl -Ss -XPOST http://localhost:8563/api -d '
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{
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"action":"pull_results",
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"sessionId" : "'"$session_id"'",
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"consumerId" : "'"$consumer_id"'"
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}
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' | json_pp; sleep 2; done`{{execute T4}}
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响应内容如下：
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```json
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{
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"body" : {
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"results" : [
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{
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"inputStatus" : "DISABLED",
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"jobId" : 0,
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"type" : "input_status"
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},
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{
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"type" : "message",
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"jobId" : 0,
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"message" : "Welcome to arthas!"
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},
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{
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"tutorials" : "https://arthas.aliyun.com/doc/arthas-tutorials.html",
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"time" : "2020-08-06 15:56:43",
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"type" : "welcome",
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"jobId" : 0,
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"pid" : "7909",
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"wiki" : "https://arthas.aliyun.com/doc",
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"version" : "3.3.7"
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},
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{
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"inputStatus" : "ALLOW_INPUT",
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"type" : "input_status",
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"jobId" : 0
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}
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]
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},
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"sessionId" : "b09f1353-202c-407b-af24-701b744f971e",
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"consumerId" : "8f7f6ad7bc2d4cb5aa57a530927a95cc_2",
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"state" : "SUCCEEDED"
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}
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```
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#### 异步执行命令
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`curl -Ss -XPOST http://localhost:8563/api -d '''
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{
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"action":"async_exec",
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"command":"watch demo.MathGame primeFactors \"{params, returnObj, throwExp}\" ",
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"sessionId" : "'"$session_id"'"
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}
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''' | json_pp`{{execute T3}}
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`async_exec` 的结果：
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```json
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{
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"sessionId" : "2b085b5d-883b-4914-ab35-b2c5c1d5aa2a",
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"state" : "SCHEDULED",
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"body" : {
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"jobStatus" : "READY",
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"jobId" : 3,
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"command" : "watch demo.MathGame primeFactors \"{params, returnObj, throwExp}\" "
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}
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}
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```
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* `state` : `SCHEDULED` 状态表示已经解析命令生成任务，但未开始执行。
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* `body.jobId` :
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异步执行命令的任务ID，可以根据此任务ID来过滤在`pull_results`输出的命令结果。
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* `body.jobStatus` : 任务状态`READY`表示未开始执行。
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切换到上面自动拉取结果消息脚本的shell（Terminal 4），查看输出：
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```json
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{
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"body" : {
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"results" : [
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{
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"type" : "command",
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"jobId" : 3,
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"state" : "SCHEDULED",
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"command" : "watch demo.MathGame primeFactors \"{params, returnObj, throwExp}\" "
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},
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{
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"inputStatus" : "ALLOW_INTERRUPT",
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"jobId" : 0,
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"type" : "input_status"
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},
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{
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"success" : true,
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"jobId" : 3,
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"effect" : {
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"listenerId" : 3,
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"cost" : 24,
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"classCount" : 1,
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"methodCount" : 1
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},
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"type" : "enhancer"
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},
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{
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"sizeLimit" : 10485760,
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"expand" : 1,
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"jobId" : 3,
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"type" : "watch",
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"cost" : 0.071499,
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"ts" : 1596703453237,
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"value" : [
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[
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-170365
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],
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null,
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{
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"stackTrace" : [
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{
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"className" : "demo.MathGame",
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"classLoaderName" : "app",
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"methodName" : "primeFactors",
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"nativeMethod" : false,
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"lineNumber" : 46,
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"fileName" : "MathGame.java"
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},
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...
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],
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"localizedMessage" : "number is: -170365, need >= 2",
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"@type" : "java.lang.IllegalArgumentException",
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"message" : "number is: -170365, need >= 2"
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}
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]
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},
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{
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"type" : "watch",
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"cost" : 0.033375,
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"jobId" : 3,
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"ts" : 1596703454241,
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"value" : [
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[
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1
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],
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[
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2,
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2,
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2,
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2,
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13,
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491
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],
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null
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],
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"sizeLimit" : 10485760,
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"expand" : 1
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}
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]
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},
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"consumerId" : "8ecb9cb7c7804d5d92e258b23d5245cc_1",
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"sessionId" : "2b085b5d-883b-4914-ab35-b2c5c1d5aa2a",
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"state" : "SUCCEEDED"
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}
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```
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watch命令结果的`value`为watch-experss的值，上面命令中为`{params, returnObj,
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throwExp}`，所以watch结果的value为一个长度为3的数组，每个元素分别对应相应顺序的表达式。
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请参考"watch命令输出map对象"小节。
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#### 中断命令执行
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中断会话正在运行的前台Job（前台任务）：
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`curl -Ss -XPOST http://localhost:8563/api -d '''
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{
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"action":"interrupt_job",
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"sessionId" : "'"$session_id"'"
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}
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''' | json_pp`{{execute T3}}
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```json
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{
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"state" : "SUCCEEDED",
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"body" : {
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"jobStatus" : "TERMINATED",
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"jobId" : 3
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}
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}
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```
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#### 关闭会话
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指定会话ID，关闭会话。
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`curl -Ss -XPOST http://localhost:8563/api -d '''
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{
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"action":"close_session",
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"sessionId" : "'"$session_id"'"
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}
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''' | json_pp`{{execute T3}}
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```json
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{
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"state" : "SUCCEEDED"
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}
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```
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