hyperledger织物中的pdf的尺寸有什么限制? [英] is there any size limit for pdf in hyperledger fabric?

问题描述

我已经使用超级账本结构和作曲家创建了小型poc. 在我的项目中，我要上传2个文件， 第一次上传文件，但是当我尝试上传相同大小的第二个文件时，在作曲家中显示错误

I have created small poc using hyperledger fabric and composer. In my project, I am uploading 2 files, for the first time the file getting uploaded but when I am trying to upload the second file of same size it show error in the composer

请求POST未处理的错误/api/UpdateContractDetails:错误:请求实体太大 在readStream(/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/raw-body/index.js:196:17) 在getRawBody(/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/raw-body/index.js:106:12) 读取时(/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/body-parser/lib/read.js:76:3) 在jsonParser(/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/body-parser/lib/types/json.js:127:5) 在Layer.handle [作为handle_request](/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/express/lib/router/layer.js:95:5 ) 在trim_prefix(/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/express/lib/router/index.js:317:13) 在/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/express/lib/router/index.js:284:7 在Function.process_params(/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/express/lib/router/index.js:335:12) 在下一个(/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/express/lib/router/index.js:275:10) 在/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/loopback/server/middleware/token.js:130:7 在/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/loopback/common/models/access-token.js:108:15 在/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/loopback/common/models/access-token.js:171:11 在_combinedTickCallback(内部/进程/next_tick.js:73:7) 在process._tickCallback(internal/process/next_tick.js:104:9)

Unhandled error for request POST /api/UpdateContractDetails: Error: request entity too large at readStream (/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/raw-body/index.js:196:17) at getRawBody (/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/raw-body/index.js:106:12) at read (/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/body-parser/lib/read.js:76:3) at jsonParser (/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/body-parser/lib/types/json.js:127:5) at Layer.handle [as handle_request] (/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/express/lib/router/layer.js:95:5) at trim_prefix (/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/express/lib/router/index.js:317:13) at /home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/express/lib/router/index.js:284:7 at Function.process_params (/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/express/lib/router/index.js:335:12) at next (/home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/express/lib/router/index.js:275:10) at /home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/loopback/server/middleware/token.js:130:7 at /home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/loopback/common/models/access-token.js:108:15 at /home/ttandale/.nvm/versions/node/v6.11.2/lib/node_modules/composer-rest-server/node_modules/loopback/common/models/access-token.js:171:11 at _combinedTickCallback (internal/process/next_tick.js:73:7) at process._tickCallback (internal/process/next_tick.js:104:9)

推荐答案

从技术上讲，这是一个Node问题.使用Javascript，例如fs.readFileSync(‘yourimageFile.jpg’).toString(‘base64’);，您应该能够在代码中将图像转换为Base64字符串.您可以为所选(建模资产类型等)字段定义字符串"，以托管在Hyperledger Composer中.从理论上讲，一旦它是一个字符串，便像其他字符串一样被发送到链码.

So technically, this is a Node question. Using Javascript, eg. fs.readFileSync(‘yourimageFile.jpg’).toString(‘base64’);, you should be able to convert the image to a Base64 string in your code. You can define 'String' for your chosen (modeled Asset type etc) field to host in Hyperledger Composer. The theory is that, once it is a string, it is sent to the chaincode just like any other string.

这些链接可能会有所帮助:

these links may help:

-> -> https://belltane.wordpress.com/2017/03/27/storing-images-in-hyperledger-fabric-blockchain/

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