首先,可能会说这个问题与HTTP请求正文非常相似,即它没有通过AWS API Gateway到达AWS Lambda函数,或者没有通过API网关在AWSLambda中获取json正文
但是,这些问题都没有解决使用Golang的问题,而我一直遇到的问题是找到event与Node.js文档中各处使用的参数等效的参数。
event
这是我的Lambda函数:
package main import ( "context" "encoding/json" "github.com/aws/aws-lambda-go/lambda" "github.com/aws/aws-lambda-go/events" "log" ) type MyReturn struct { Response string `json:"response"` } type APIGWResponse struct { IsBase64Encoded bool `json:"isBase64Encoded"` StatusCode int `json:"statusCode"` Headers map[string]string `json:"headers"` Body string `json:"body"` } func handle(ctx context.Context, name MyReturn) (APIGWResponse, error) { log.Print("Called by ", name) log.Print("context ", ctx) headers := map[string]string{"Access-Control-Allow-Origin": "*", "Access-Control-Allow-Headers": "Origin, X-Requested-With, Content-Type, Accept"} code := 200 response, error := json.Marshal(myReturn{Response:"Hello, " + name.Body}) if error != nil { log.Println(error) response = []byte("Internal Server Error") code = 500 } return APIGWResponse{true, code, headers, string(response)}, nil } func main() { lambda.Start(handle) }
问题:MyReturn从API GW调用时,对象未填充任何值。该行log.Print("Called by ", name)导致没有任何内容附加到Called by字符串。
MyReturn
log.Print("Called by ", name)
Called by
向API GW的请求:
POST -> body: '{"name":"Bob"}', headers: {'Content-Type': 'application/json'}
这是在纯JS中执行的,如下所示:
const BASE_URL = "https://my_api_id.execute-api.us-east-1.amazonaws.com/prod/"; const TRIGGER_URL = "my_lambda_function"; function toGW() { fetch(BASE_URL + TRIGGER_URL, { method: 'POST', body: '{"name":"Bimesh"}', headers:{ 'Content-Type': 'application/json' } }) .then(data => data.json()) .then(json => console.log(json)) .catch(error => console.log(error)); }
但是,从AWS Lambda控制台进行测试时,完全相同的主体可以工作。
身体:
{"name":"Bob"}
事实证明,即使我无法在面向用户的网站上找到与此相关的任何文档,也确实存在文档。阅读此内容:https : //github.com/aws/aws-lambda- go/blob/master/events/README_ApiGatewayEvent.md
到目前为止,这是我想出的从API GW接收数据并响应请求的最简单方法:
package main import ( "context" "encoding/json" "github.com/aws/aws-lambda-go/lambda" "github.com/aws/aws-lambda-go/events" "log" ) type myReturn struct { Response string `json:"response"` } func handle(ctx context.Context, name events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) { log.Print("Request body: ", name) log.Print("context ", ctx) headers := map[string]string{"Access-Control-Allow-Origin": "*", "Access-Control-Allow-Headers": "Origin, X-Requested-With, Content-Type, Accept"} code := 200 response, error := json.Marshal(myReturn{Response:"Hello, " + name.Body}) if error != nil { log.Println(error) response = []byte("Internal Server Error") code = 500 } return events.APIGatewayProxyResponse {code, headers, string(response), false}, nil } func main() { lambda.Start(handle) }
在这种情况下,该log.Print("Request body: ", name)行会导致记录准确的请求正文。问题解决了。
log.Print("Request body: ", name)
注意:同样,我也不必APIGWResponse从问题中创建该对象,这events.APIGatewayProxyResponse是已经为您完成的完全相同的事情。这些对象都在此类中:https : //github.com/aws/aws-lambda- go/blob/master/events/apigw.go
APIGWResponse
events.APIGatewayProxyResponse