Documentation
¶
Overview ¶
Package httpapi is backd's HTTP layer: routing, middleware, error envelope, the generic document handlers and the /_auth endpoints.
Index ¶
- Constants
- func NewHandler(cfg Config) http.Handler
- func NewInternalHandler(cfg Config) http.Handler
- func Run(ctx context.Context, srv *http.Server, ln net.Listener, ...) error
- func ServerTimeouts(srv *http.Server, opTimeout time.Duration)
- type Config
- type Detail
- type FunctionRunner
- type Store
- type Worker
Constants ¶
const ( DevDurationHeader = "X-Backd-Dev-Duration-Ms" DevLogsHeader = "X-Backd-Dev-Logs" )
DevDurationHeader and DevLogsHeader carry the function's timing and console output back to the caller, only in dev mode (BACKD_DEV): a production call never leaks another caller's function logs. `backd functions invoke` reads them.
const DefaultMaxBodyBytes = 1 << 20
DefaultMaxBodyBytes is the request body limit when none is configured.
const DefaultOpTimeout = 10 * time.Second
DefaultOpTimeout is the per-request storage deadline when none is configured.
Variables ¶
This section is empty.
Functions ¶
func NewHandler ¶
NewHandler builds the complete HTTP handler.
func NewInternalHandler ¶
NewInternalHandler builds the internal listener's handler, for the functions executor only: bundles by hash (with the executor's token) and the data routes for functions calling back (with callback tokens, and nothing else). It must never be reachable from outside.
func Run ¶
func Run(ctx context.Context, srv *http.Server, ln net.Listener, shutdownTimeout time.Duration, log *slog.Logger) error
Run serves on ln until ctx is done, then shuts down gracefully: the listener closes at once (new connections are refused) and in-flight requests get up to shutdownTimeout to finish. Requests still running after that are aborted and Run returns an error.
Types ¶
type Config ¶
type Config struct {
Log *slog.Logger
Registry *registry.Registry
Store Store
// Ready reports whether backd can serve requests (e.g. MongoDB reachable).
Ready func(ctx context.Context) error
// Now is the clock for _meta timestamps; defaults to time.Now.
Now func() time.Time
// MaxBodyBytes caps request bodies; defaults to DefaultMaxBodyBytes.
MaxBodyBytes int64
// OpTimeout bounds the storage work of each document request;
// defaults to DefaultOpTimeout.
OpTimeout time.Duration
// TrustedProxies are the networks whose X-Forwarded-For header is
// believed when finding the client's address (for login throttling).
TrustedProxies []netip.Prefix
// Users returns the user service of a realm with auth enabled, or nil
// (unknown realm or auth disabled). Nil Users disables /_auth routes.
Users func(realm string) *auth.Users
// ConfigFingerprint identifies the config this instance runs; /readyz
// reports it so operators can check every instance runs the same one.
ConfigFingerprint string
// Functions runs function calls (the executor client); nil: calls get 503.
Functions FunctionRunner
// CallbackKey signs the callback tokens functions reach data with; the
// internal listener verifies them.
CallbackKey []byte
// CallbackURL is backd's internal listener as the executor and
// functions reach it (bundles and callbacks), e.g. http://backd:8081.
CallbackURL string
// ExecutorToken authenticates the executor's bundle fetches.
ExecutorToken string
// Dev rereads function bundle manifests on every call instead of once
// (BACKD_DEV), so a background rebuild is served without a restart.
Dev bool
}
Config holds the handler dependencies.
type FunctionRunner ¶
type FunctionRunner interface {
Invoke(ctx context.Context, req executor.InvokeRequest) (executor.Result, error)
}
FunctionRunner runs an invocation: the executor client, or a fake in tests.
type Store ¶
type Store interface {
Repository(c *registry.Collection) storage.Repository
// Transact runs fn once; every write made through a Repository, using
// the context fn receives, either all commit or none do (batch writes,
// roadmap F7). fn may run more than once on a transient conflict, so
// it must have no side effects beyond the repositories it's given.
Transact(ctx context.Context, fn func(ctx context.Context) error) error
}
Store gives access to the repository of each configured collection.
type Worker ¶
type Worker struct {
// contains filtered or unexported fields
}
Worker claims and runs async jobs (roadmap F11): `backd worker`, or `backd serve --with-worker` in the same process. It never listens: it reaches the executor and backd's own API (ctx.db) exactly like a function's own caller would, reusing the same bundle resolution, callback construction and invocation recording sync calls use.
func NewWorker ¶
NewWorker builds a worker from the same Config NewHandler uses. id identifies this process in job leases (so an operator can tell which instance claimed a stuck job).
func (*Worker) EnqueueDue ¶
EnqueueDue creates the job of every scheduled function whose latest scheduled time is recent enough and has no job yet (roadmap F18). Every worker runs it; the run's deterministic id makes the insert succeed for exactly one of them.
Source Files