hatecomputers.club/api/serve.go

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2024-03-26 18:00:05 -04:00
package api
import (
"crypto/rand"
"database/sql"
"fmt"
"log"
"net/http"
"time"
"git.hatecomputers.club/hatecomputers/hatecomputers.club/args"
)
type RequestContext struct {
DBConn *sql.DB
Args *args.Arguments
Id string
Start time.Time
}
type Continuation func(*RequestContext, *http.Request, http.ResponseWriter) ContinuationChain
type ContinuationChain func(Continuation, Continuation) ContinuationChain
func randomId() string {
uuid := make([]byte, 16)
_, err := rand.Read(uuid)
if err != nil {
panic(err)
}
uuid[8] = uuid[8]&^0xc0 | 0x80
uuid[6] = uuid[6]&^0xf0 | 0x40
return fmt.Sprintf("%x-%x-%x-%x-%x", uuid[0:4], uuid[4:6], uuid[6:8], uuid[8:10], uuid[10:])
}
func LogRequestContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
return func(success Continuation, _failure Continuation) ContinuationChain {
context.Start = time.Now()
context.Id = randomId()
log.Println(req.Method, req.URL.Path, req.RemoteAddr, context.Id)
return success(context, req, resp)
}
}
func LogExecutionTimeContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
return func(success Continuation, _failure Continuation) ContinuationChain {
end := time.Now()
log.Println(context.Id, "took", end.Sub(context.Start))
return success(context, req, resp)
}
}
func HealthCheckContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
return func(success Continuation, _failure Continuation) ContinuationChain {
resp.WriteHeader(200)
resp.Write([]byte("healthy"))
return success(context, req, resp)
}
}
func FailurePassingContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
return func(_success Continuation, failure Continuation) ContinuationChain {
return failure(context, req, resp)
}
}
func IdContinuation(context *RequestContext, req *http.Request, resp http.ResponseWriter) ContinuationChain {
return func(success Continuation, _failure Continuation) ContinuationChain {
return success(context, req, resp)
}
}
func MakeServer(argv *args.Arguments, dbConn *sql.DB) *http.Server {
mux := http.NewServeMux()
fileServer := http.FileServer(http.Dir(argv.StaticPath))
mux.Handle("/static/", http.StripPrefix("/static/", fileServer))
makeRequestContext := func() *RequestContext {
return &RequestContext{
DBConn: dbConn,
Args: argv,
}
}
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
requestContext := makeRequestContext()
LogRequestContinuation(requestContext, r, w)(TemplateContinuation("home.html", nil, true), FailurePassingContinuation)(LogExecutionTimeContinuation, LogExecutionTimeContinuation)(IdContinuation, IdContinuation)
})
mux.HandleFunc("GET /api/health", func(w http.ResponseWriter, r *http.Request) {
requestContext := makeRequestContext()
LogRequestContinuation(requestContext, r, w)(HealthCheckContinuation, FailurePassingContinuation)(LogExecutionTimeContinuation, LogExecutionTimeContinuation)(IdContinuation, IdContinuation)
})
mux.HandleFunc("GET /{name}", func(w http.ResponseWriter, r *http.Request) {
requestContext := makeRequestContext()
name := r.PathValue("name")
LogRequestContinuation(requestContext, r, w)(TemplateContinuation(name+".html", nil, true), FailurePassingContinuation)(LogExecutionTimeContinuation, LogExecutionTimeContinuation)(IdContinuation, IdContinuation)
})
return &http.Server{
Addr: ":" + fmt.Sprint(argv.Port),
Handler: mux,
}
}