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diff --git a/standardization/docs/custom_header.rst b/standardization/docs/custom_header.rst new file mode 100644 index 00000000..59014aa4 --- /dev/null +++ b/standardization/docs/custom_header.rst @@ -0,0 +1,86 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. Copyright 2019 vmware + +1. Background +============= + +Trouble shooting and tell client the latest api version under that major version is requested. + +2. Propose +========== + +https://wiki.onap.org/display/DW/ONAP+API+Common+Versioning+Strategy+%28CVS%29+Guidelines + +3. HLD +====== + +3.1 Version Management +---------------------- + +Every component provides a json file or property configuration which is used to describe the api version detail. The example of json file content as: +{ +"apiVersion": +{ +"eventListener":["4.7.2","5.3.2","5.4.1","7.0.1"], +"xxxxxx": ["1.0.2","1.1.2","2.0.1"] +} +} + +============== ============== ===================================================================================================================================================================================================================================== +**Field** **Value type** **remark** +apiVersion Map An identify that start to describe the api versions +eventListener Array<String> A service, resource or function name of component, which is a unique identify of one api. Requirement: describe the api version in sequence that is from first version to greatest version. +============== ============== ===================================================================================================================================================================================================================================== + +In the future, if there are other version configurations which need to be described, extend other fields. + +3.2 Return response with custom headers +--------------------------------------- + +First, server should check the custom header of client, if X-MinorVersion does not exist which is maybe deletes after a period time or that client requests is wrong because of some reason, return response with errorcode 400 and the first major version including X-MinorVersion, X-PatchVersion, X-LatestVersion. + +3.2.1 Minor version non-exist +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +For exmpale, ves has no 5.2.x version, so if the request of client is major version v5, X-MinorVersion is 2, the server return with 400 errorcode and custom headers including X-MinorVersion 4, X-PatchVersion 1, X-LatestVersion 5.4.1 + +=========================== ================== ================== ================== =================== ====================================================================================================================================== +**Client send** **Server return** +=========================== ================== ================== ================== =================== ====================================================================================================================================== +**major version requested** **X-MinorVersion** **X-MinorVersion** **X-PatchVersion** **X-LatestVersion** **remark** +v5 2 4 1 7.0.1 Fail to valid, return 400. X-MinorVersion and x-patchversion are under the last version that the major version is requested by client. +=========================== ================== ================== ================== =================== ====================================================================================================================================== + +3.2.2 Minor version exist +~~~~~~~~~~~~~~~~~~~~~~~~~ + +=========================== ================== ================== ================== =================== ===================================================== +**Client send** **Server return** +=========================== ================== ================== ================== =================== ===================================================== +**major version requested** **X-MinorVersion** **X-MinorVersion** **X-PatchVersion** **X-LatestVersion** **remark** +v5 no 3 2 7.0.1 Supported request; X-MinorVersion and x-patchversion are under the first version that the major +v5 4 4 1 7.0.1 Valid request; respond with customer header +v5 3 3 2 7.0.1 Valid request; respond with customer header +v7 no 0 1 7.0.1 Supported request; notify client with customer header +v7 0 0 1 7.0.1 Supported request; notify client with customer header +=========================== ================== ================== ================== =================== ===================================================== + +3.3 Code Implement +------------------ + +CustomHeaderUtils is a class that provides functions to validate the X-MinorVersion which client requests and return the response header according to the client request. + +The usage example: +------------------ +CustomHeaderUtils util = new CustomHeaderUtils(requestMajorVer, reqHeaderMap, filePath, "eventListener"); + + +// check request header + +util.isOkCustomHeaders(); + + +// get response header + +Map<String, String> rspHeader = util.getRspCustomHeader()
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