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request_id.go
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request_id.go
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package middleware
import (
"github.com/b2wdigital/restQL-golang/v4/pkg/restql"
"github.com/valyala/fasthttp"
)
type idGenerator interface {
Run() string
}
type requestID struct {
header string
generator idGenerator
}
var strategyToGenerator = map[string]idGenerator{
"base64": newBase64IdGenerator(),
"uuid": newUUIDGenerator(),
}
func newRequestID(header string, strategy string, log restql.Logger) Middleware {
if header == "" {
log.Warn("failed to initialize request id middleware : empty header name")
return noopMiddleware{}
}
generator, ok := strategyToGenerator[strategy]
if !ok {
log.Warn("failed to initialize request id middleware : unknow strategy", "strategy", strategy)
return noopMiddleware{}
}
return requestID{
header: header,
generator: generator,
}
}
func (r requestID) Apply(h fasthttp.RequestHandler) fasthttp.RequestHandler {
return func(ctx *fasthttp.RequestCtx) {
var requestID string
currentRequestID := ctx.Request.Header.Peek(r.header)
if len(currentRequestID) == 0 {
requestID = r.generator.Run()
ctx.Request.Header.Set(r.header, requestID)
} else {
requestID = string(currentRequestID)
}
h(ctx)
ctx.Response.Header.Set(r.header, requestID)
}
}