distribution/vendor/github.com/bugsnag/bugsnag-go/middleware.go

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package bugsnag
import (
"net/http"
"strings"
)
type (
beforeFunc func(*Event, *Configuration) error
// MiddlewareStacks keep middleware in the correct order. They are
// called in reverse order, so if you add a new middleware it will
// be called before all existing middleware.
middlewareStack struct {
before []beforeFunc
}
)
// AddMiddleware adds a new middleware to the outside of the existing ones,
// when the middlewareStack is Run it will be run before all middleware that
// have been added before.
func (stack *middlewareStack) OnBeforeNotify(middleware beforeFunc) {
stack.before = append(stack.before, middleware)
}
// Run causes all the middleware to be run. If they all permit it the next callback
// will be called with all the middleware on the stack.
func (stack *middlewareStack) Run(event *Event, config *Configuration, next func() error) error {
// run all the before filters in reverse order
for i := range stack.before {
before := stack.before[len(stack.before)-i-1]
err := stack.runBeforeFilter(before, event, config)
if err != nil {
return err
}
}
return next()
}
func (stack *middlewareStack) runBeforeFilter(f beforeFunc, event *Event, config *Configuration) error {
defer func() {
if err := recover(); err != nil {
config.log("bugsnag/middleware: unexpected panic: %v", err)
}
}()
return f(event, config)
}
// catchMiddlewarePanic is used to log any panics that happen inside Middleware,
// we wouldn't want to not notify Bugsnag in this case.
func catchMiddlewarePanic(event *Event, config *Configuration, next func() error) {
}
// httpRequestMiddleware is added OnBeforeNotify by default. It takes information
// from an http.Request passed in as rawData, and adds it to the Event. You can
// use this as a template for writing your own Middleware.
func httpRequestMiddleware(event *Event, config *Configuration) error {
for _, datum := range event.RawData {
if request, ok := datum.(*http.Request); ok {
proto := "http://"
if request.TLS != nil {
proto = "https://"
}
event.MetaData.Update(MetaData{
"Request": {
"RemoteAddr": request.RemoteAddr,
"Method": request.Method,
"Url": proto + request.Host + request.RequestURI,
"Params": request.URL.Query(),
},
})
// Add headers as a separate tab.
event.MetaData.AddStruct("Headers", request.Header)
// Default context to Path
if event.Context == "" {
event.Context = request.URL.Path
}
// Default user.id to IP so that users-affected works.
if event.User == nil {
ip := request.RemoteAddr
if idx := strings.LastIndex(ip, ":"); idx != -1 {
ip = ip[:idx]
}
event.User = &User{Id: ip}
}
}
}
return nil
}