Xpath 使用WSO2 ESB组合两个查询
我一直在试图弄清楚如何让WSO2的ESB调用两个不同的API,并将它们的结果合并到一个响应中,结果只会遇到麻烦。最基本的是,我有两个后端,我请求它们响应如下内容:Xpath 使用WSO2 ESB组合两个查询,xpath,wso2,wso2esb,synapse,Xpath,Wso2,Wso2esb,Synapse,我一直在试图弄清楚如何让WSO2的ESB调用两个不同的API,并将它们的结果合并到一个响应中,结果只会遇到麻烦。最基本的是,我有两个后端,我请求它们响应如下内容: <items> <item> <id>1</id> <name>Item 1</name> <parts> <part> <
<items>
<item>
<id>1</id>
<name>Item 1</name>
<parts>
<part>
<id>1</id>
<name>Part 1.1</name>
</part>
<part>
<id>1</id>
<name>Part 1.2</name>
</part>
<part>
<id>1</id>
<name>Part 1.3</name>
</part>
</parts>
</item>
<item>
<id>2</id>
<name>Item 2</name>
<parts>
<part>
<id>2</id>
<name>Part 2.1</name>
</part>
<part>
<id>2</id>
<name>Part 2.2</name>
</part>
</parts>
</item>
</items>
:
<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query name="items" xmlns="http://example.com/query">
<row>
<id>1</id>
<name>Item 1</name>
</row>
<row>
<id>2</id>
<name>Item 2</name>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query name="parts" xmlns="http://example.com/query">
<row>
<id>1</id>
<part>Part 1.1</part>
</row>
<row>
<id>1</id>
<part>Part 1.2</part>
</row>
<row>
<id>1</id>
<part>Part 1.3</part>
</row>
<row>
<id>2</id>
<part>Part 2.1</part>
</row>
<row>
<id>2</id>
<part>Part 2.2</part>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
这里的插入顺序大大简化了,但它确实发送了两个有效的查询并返回了预期的响应。这里所写的outSequence从不向客户机发送响应或在服务器上记录错误。如果我从aggregate
中删除correlateOn
元素,我会从两个API调用中的一个调用中返回一个行
。我想,correlateOn
是我想在这里使用的东西,但是我在WSO2或Apache上都找不到任何有用的文档,所以我肯定我使用的不正确。我的XPath背景相当薄弱,所以我相信该表达式也需要一些工作
我是否至少在克隆/聚合模式方面走对了轨道?我将如何将这两个查询的结果组合成类似于我的示例的内容?如果我能完成一些事情,那么我应该能够用XSLT完成其余的工作。看一下这个演示: 带有项目响应的后端1:
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="items"
transports="https http"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query xmlns="http://example.com/query" name="items">
<row>
<id>1</id>
<name>Item 1</name>
</row>
<row>
<id>2</id>
<name>Item 2</name>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<log level="full"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
</proxy>
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="parts"
transports="https http"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query xmlns="http://example.com/query" name="parts">
<row>
<id>1</id>
<part>Part 1.1</part>
</row>
<row>
<id>1</id>
<part>Part 1.2</part>
</row>
<row>
<id>1</id>
<part>Part 1.3</part>
</row>
<row>
<id>2</id>
<part>Part 2.1</part>
</row>
<row>
<id>2</id>
<part>Part 2.2</part>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<log level="full"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
</proxy>
<items xmlns="http://ws.apache.org/ns/synapse" xmlns:syn="http://ws.apache.org/ns/synapse" xmlns:saxon="http://saxon.sf.net/" xmlns:exslt="http://exslt.org/common">
<item>
<id>1</id>
<name>Item 1</name>
<parts>
<part>
<id>1</id>
<name>Part 1.1</name>
</part>
<part>
<id>1</id>
<name>Part 1.2</name>
</part>
<part>
<id>1</id>
<name>Part 1.3</name>
</part>
</parts>
</item>
<item>
<id>2</id>
<name>Item 2</name>
<parts>
<part>
<id>2</id>
<name>Part 2.1</name>
</part>
<part>
<id>2</id>
<name>Part 2.2</name>
</part>
</parts>
</item>
</items>
1.
项目1
2.
项目2
具有部件响应的后端2:
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="items"
transports="https http"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query xmlns="http://example.com/query" name="items">
<row>
<id>1</id>
<name>Item 1</name>
</row>
<row>
<id>2</id>
<name>Item 2</name>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<log level="full"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
</proxy>
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="parts"
transports="https http"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query xmlns="http://example.com/query" name="parts">
<row>
<id>1</id>
<part>Part 1.1</part>
</row>
<row>
<id>1</id>
<part>Part 1.2</part>
</row>
<row>
<id>1</id>
<part>Part 1.3</part>
</row>
<row>
<id>2</id>
<part>Part 2.1</part>
</row>
<row>
<id>2</id>
<part>Part 2.2</part>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<log level="full"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
</proxy>
<items xmlns="http://ws.apache.org/ns/synapse" xmlns:syn="http://ws.apache.org/ns/synapse" xmlns:saxon="http://saxon.sf.net/" xmlns:exslt="http://exslt.org/common">
<item>
<id>1</id>
<name>Item 1</name>
<parts>
<part>
<id>1</id>
<name>Part 1.1</name>
</part>
<part>
<id>1</id>
<name>Part 1.2</name>
</part>
<part>
<id>1</id>
<name>Part 1.3</name>
</part>
</parts>
</item>
<item>
<id>2</id>
<name>Item 2</name>
<parts>
<part>
<id>2</id>
<name>Part 2.1</name>
</part>
<part>
<id>2</id>
<name>Part 2.2</name>
</part>
</parts>
</item>
</items>
1.
第1.1部分
1.
第1.2部分
1.
第1.3部分
2.
第2.1部分
2.
第2.2部分
我的API调用后端1和后端2并使用xslt转换:
<?xml version="1.0" encoding="UTF-8"?>
<api xmlns="http://ws.apache.org/ns/synapse"
name="ItemList"
context="/item_list">
<resource methods="POST" uri-template="/">
<inSequence>
<header name="Action" scope="default" value="urn:mediate"/>
<call>
<endpoint>
<address uri="http://localhost:8283/services/items.itemsHttpSoap11Endpoint"
format="soap11"/>
</endpoint>
</call>
<enrich>
<source type="inline" clone="true">
<Payloads/>
</source>
<target type="property" property="Items"/>
</enrich>
<enrich>
<source clone="true" xpath="$body/*"/>
<target action="child" xpath="$ctx:Items"/>
</enrich>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body/>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<call>
<endpoint>
<address uri="http://localhost:8283/services/parts.partsHttpSoap11Endpoint"
format="soap11"/>
</endpoint>
</call>
<enrich>
<source clone="true" xpath="$body/*[name()='response']/*[name()='query']"/>
<target type="property" property="Parts"/>
</enrich>
<enrich>
<source type="property" clone="true" property="Parts"/>
<target action="child" xpath="$ctx:Items"/>
</enrich>
<enrich>
<source type="property" property="Items"/>
<target type="body"/>
</enrich>
<xslt key="transformTwoSourcesToOneResult"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</resource>
</api>
以及我的xslt转换:
<?xml version="1.0" encoding="UTF-8"?>
<localEntry key="transformTwoSourcesToOneResult" xmlns="http://ws.apache.org/ns/synapse">
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:ns0="http://example.com/query"
xmlns:ns1="http://example.com/response"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:exslt="http://exslt.org/common"
xmlns:saxon="http://saxon.sf.net/"
xmlns:syn="http://ws.apache.org/ns/synapse"
exclude-result-prefixes="ns0 ns1 xs">
<xsl:output method="xml" encoding="UTF-8" indent="yes"/>
<xsl:template match="/">
<xsl:variable name="var1_instance_Payloads" select="."/>
<items>
<xsl:for-each select="$var1_instance_Payloads/syn:Payloads">
<xsl:variable name="var2_Payloads" select="."/>
<xsl:for-each select="$var2_Payloads/ns1:response/ns0:query/ns0:row">
<xsl:variable name="var2_row" select="."/>
<item>
<id>
<xsl:value-of select="number(string($var2_row/ns0:id))"/>
</id>
<name>
<xsl:value-of select="string($var2_row/ns0:name)"/>
</name>
<parts>
<xsl:for-each select="$var2_Payloads/ns0:query/ns0:row">
<xsl:variable name="var4_row" select="."/>
<xsl:if test="string((number(string($var2_row/ns0:id)) = number(string($var4_row/ns0:id)))) != 'false'">
<part>
<id>
<xsl:value-of select="number(string($var4_row/ns0:id))"/>
</id>
<name>
<xsl:value-of select="string($var4_row/ns0:part)"/>
</name>
</part>
</xsl:if>
</xsl:for-each>
</parts>
</item>
</xsl:for-each>
</xsl:for-each>
</items>
</xsl:template>
</xsl:stylesheet>
</localEntry>
API响应:
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="items"
transports="https http"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query xmlns="http://example.com/query" name="items">
<row>
<id>1</id>
<name>Item 1</name>
</row>
<row>
<id>2</id>
<name>Item 2</name>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<log level="full"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
</proxy>
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="parts"
transports="https http"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query xmlns="http://example.com/query" name="parts">
<row>
<id>1</id>
<part>Part 1.1</part>
</row>
<row>
<id>1</id>
<part>Part 1.2</part>
</row>
<row>
<id>1</id>
<part>Part 1.3</part>
</row>
<row>
<id>2</id>
<part>Part 2.1</part>
</row>
<row>
<id>2</id>
<part>Part 2.2</part>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<log level="full"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
</proxy>
<items xmlns="http://ws.apache.org/ns/synapse" xmlns:syn="http://ws.apache.org/ns/synapse" xmlns:saxon="http://saxon.sf.net/" xmlns:exslt="http://exslt.org/common">
<item>
<id>1</id>
<name>Item 1</name>
<parts>
<part>
<id>1</id>
<name>Part 1.1</name>
</part>
<part>
<id>1</id>
<name>Part 1.2</name>
</part>
<part>
<id>1</id>
<name>Part 1.3</name>
</part>
</parts>
</item>
<item>
<id>2</id>
<name>Item 2</name>
<parts>
<part>
<id>2</id>
<name>Part 2.1</name>
</part>
<part>
<id>2</id>
<name>Part 2.2</name>
</part>
</parts>
</item>
</items>
1.
项目1
1.
第1.1部分
1.
第1.2部分
1.
第1.3部分
2.
项目2
2.
第2.1部分
2.
第2.2部分
看看这个演示:
带有项目响应的后端1:
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="items"
transports="https http"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query xmlns="http://example.com/query" name="items">
<row>
<id>1</id>
<name>Item 1</name>
</row>
<row>
<id>2</id>
<name>Item 2</name>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<log level="full"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
</proxy>
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="parts"
transports="https http"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query xmlns="http://example.com/query" name="parts">
<row>
<id>1</id>
<part>Part 1.1</part>
</row>
<row>
<id>1</id>
<part>Part 1.2</part>
</row>
<row>
<id>1</id>
<part>Part 1.3</part>
</row>
<row>
<id>2</id>
<part>Part 2.1</part>
</row>
<row>
<id>2</id>
<part>Part 2.2</part>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<log level="full"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
</proxy>
<items xmlns="http://ws.apache.org/ns/synapse" xmlns:syn="http://ws.apache.org/ns/synapse" xmlns:saxon="http://saxon.sf.net/" xmlns:exslt="http://exslt.org/common">
<item>
<id>1</id>
<name>Item 1</name>
<parts>
<part>
<id>1</id>
<name>Part 1.1</name>
</part>
<part>
<id>1</id>
<name>Part 1.2</name>
</part>
<part>
<id>1</id>
<name>Part 1.3</name>
</part>
</parts>
</item>
<item>
<id>2</id>
<name>Item 2</name>
<parts>
<part>
<id>2</id>
<name>Part 2.1</name>
</part>
<part>
<id>2</id>
<name>Part 2.2</name>
</part>
</parts>
</item>
</items>
1.
项目1
2.
项目2
具有部件响应的后端2:
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="items"
transports="https http"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query xmlns="http://example.com/query" name="items">
<row>
<id>1</id>
<name>Item 1</name>
</row>
<row>
<id>2</id>
<name>Item 2</name>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<log level="full"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
</proxy>
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="parts"
transports="https http"
startOnLoad="true">
<target>
<inSequence>
<payloadFactory media-type="xml">
<format>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<response xmlns="http://example.com/response">
<query xmlns="http://example.com/query" name="parts">
<row>
<id>1</id>
<part>Part 1.1</part>
</row>
<row>
<id>1</id>
<part>Part 1.2</part>
</row>
<row>
<id>1</id>
<part>Part 1.3</part>
</row>
<row>
<id>2</id>
<part>Part 2.1</part>
</row>
<row>
<id>2</id>
<part>Part 2.2</part>
</row>
</query>
</response>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<log level="full"/>
<loopback/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</target>
</proxy>
<items xmlns="http://ws.apache.org/ns/synapse" xmlns:syn="http://ws.apache.org/ns/synapse" xmlns:saxon="http://saxon.sf.net/" xmlns:exslt="http://exslt.org/common">
<item>
<id>1</id>
<name>Item 1</name>
<parts>
<part>
<id>1</id>
<name>Part 1.1</name>
</part>
<part>
<id>1</id>
<name>Part 1.2</name>
</part>
<part>
<id>1</id>
<name>Part 1.3</name>
</part>
</parts>
</item>
<item>
<id>2</id>
<name>Item 2</name>
<parts>
<part>
<id>2</id>
<name>Part 2.1</name>
</part>
<part>
<id>2</id>
<name>Part 2.2</name>
</part>
</parts>
</item>
</items>
1.
第1.1部分
1.
第1.2部分
1.
第1.3部分