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hub.go
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hub.go
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package sentry
import (
"context"
"fmt"
"sync"
"time"
)
type contextKey int
// Keys used to store values in a Context. Use with Context.Value to access
// values stored by the SDK.
const (
// HubContextKey is the key used to store the current Hub.
HubContextKey = contextKey(1)
// RequestContextKey is the key used to store the current http.Request.
RequestContextKey = contextKey(2)
)
// defaultMaxBreadcrumbs is the default maximum number of breadcrumbs added to
// an event. Can be overwritten with the maxBreadcrumbs option.
const defaultMaxBreadcrumbs = 30
// maxBreadcrumbs is the absolute maximum number of breadcrumbs added to an
// event. The maxBreadcrumbs option cannot be set higher than this value.
const maxBreadcrumbs = 100
// currentHub is the initial Hub with no Client bound and an empty Scope.
var currentHub = NewHub(nil, NewScope())
// Hub is the central object that manages scopes and clients.
//
// This can be used to capture events and manage the scope.
// The default hub that is available automatically.
//
// In most situations developers do not need to interface the hub. Instead
// toplevel convenience functions are exposed that will automatically dispatch
// to global (CurrentHub) hub. In some situations this might not be
// possible in which case it might become necessary to manually work with the
// hub. This is for instance the case when working with async code.
type Hub struct {
mu sync.RWMutex
stack *stack
lastEventID EventID
}
type layer struct {
// mu protects concurrent reads and writes to client.
mu sync.RWMutex
client *Client
// scope is read-only, not protected by mu.
scope *Scope
}
// Client returns the layer's client. Safe for concurrent use.
func (l *layer) Client() *Client {
l.mu.RLock()
defer l.mu.RUnlock()
return l.client
}
// SetClient sets the layer's client. Safe for concurrent use.
func (l *layer) SetClient(c *Client) {
l.mu.Lock()
defer l.mu.Unlock()
l.client = c
}
type stack []*layer
// NewHub returns an instance of a Hub with provided Client and Scope bound.
func NewHub(client *Client, scope *Scope) *Hub {
hub := Hub{
stack: &stack{{
client: client,
scope: scope,
}},
}
return &hub
}
// CurrentHub returns an instance of previously initialized Hub stored in the global namespace.
func CurrentHub() *Hub {
return currentHub
}
// LastEventID returns the ID of the last event (error or message) captured
// through the hub and sent to the underlying transport.
//
// Transactions and events dropped by sampling or event processors do not change
// the last event ID.
//
// LastEventID is a convenience method to cover use cases in which errors are
// captured indirectly and the ID is needed. For example, it can be used as part
// of an HTTP middleware to log the ID of the last error, if any.
//
// For more flexibility, consider instead using the ClientOptions.BeforeSend
// function or event processors.
func (hub *Hub) LastEventID() EventID {
hub.mu.RLock()
defer hub.mu.RUnlock()
return hub.lastEventID
}
// stackTop returns the top layer of the hub stack. Valid hubs always have at
// least one layer, therefore stackTop always return a non-nil pointer.
func (hub *Hub) stackTop() *layer {
hub.mu.RLock()
defer hub.mu.RUnlock()
stack := hub.stack
stackLen := len(*stack)
top := (*stack)[stackLen-1]
return top
}
// Clone returns a copy of the current Hub with top-most scope and client copied over.
func (hub *Hub) Clone() *Hub {
top := hub.stackTop()
scope := top.scope
if scope != nil {
scope = scope.Clone()
}
return NewHub(top.Client(), scope)
}
// Scope returns top-level Scope of the current Hub or nil if no Scope is bound.
func (hub *Hub) Scope() *Scope {
top := hub.stackTop()
return top.scope
}
// Client returns top-level Client of the current Hub or nil if no Client is bound.
func (hub *Hub) Client() *Client {
top := hub.stackTop()
return top.Client()
}
// PushScope pushes a new scope for the current Hub and reuses previously bound Client.
func (hub *Hub) PushScope() *Scope {
top := hub.stackTop()
var scope *Scope
if top.scope != nil {
scope = top.scope.Clone()
} else {
scope = NewScope()
}
hub.mu.Lock()
defer hub.mu.Unlock()
*hub.stack = append(*hub.stack, &layer{
client: top.Client(),
scope: scope,
})
return scope
}
// PopScope drops the most recent scope.
//
// Calls to PopScope must be coordinated with PushScope. For most cases, using
// WithScope should be more convenient.
//
// Calls to PopScope that do not match previous calls to PushScope are silently
// ignored.
func (hub *Hub) PopScope() {
hub.mu.Lock()
defer hub.mu.Unlock()
stack := *hub.stack
stackLen := len(stack)
if stackLen > 1 {
// Never pop the last item off the stack, the stack should always have
// at least one item.
*hub.stack = stack[0 : stackLen-1]
}
}
// BindClient binds a new Client for the current Hub.
func (hub *Hub) BindClient(client *Client) {
top := hub.stackTop()
top.SetClient(client)
}
// WithScope runs f in an isolated temporary scope.
//
// It is useful when extra data should be sent with a single capture call, for
// instance a different level or tags.
//
// The scope passed to f starts as a clone of the current scope and can be
// freely modified without affecting the current scope.
//
// It is a shorthand for PushScope followed by PopScope.
func (hub *Hub) WithScope(f func(scope *Scope)) {
scope := hub.PushScope()
defer hub.PopScope()
f(scope)
}
// ConfigureScope runs f in the current scope.
//
// It is useful to set data that applies to all events that share the current
// scope.
//
// Modifying the scope affects all references to the current scope.
//
// See also WithScope for making isolated temporary changes.
func (hub *Hub) ConfigureScope(f func(scope *Scope)) {
scope := hub.Scope()
f(scope)
}
// CaptureEvent calls the method of a same name on currently bound Client instance
// passing it a top-level Scope.
// Returns EventID if successfully, or nil if there's no Scope or Client available.
func (hub *Hub) CaptureEvent(event *Event) *EventID {
client, scope := hub.Client(), hub.Scope()
if client == nil || scope == nil {
return nil
}
eventID := client.CaptureEvent(event, nil, scope)
if event.Type != transactionType && eventID != nil {
hub.mu.Lock()
hub.lastEventID = *eventID
hub.mu.Unlock()
}
return eventID
}
// CaptureMessage calls the method of a same name on currently bound Client instance
// passing it a top-level Scope.
// Returns EventID if successfully, or nil if there's no Scope or Client available.
func (hub *Hub) CaptureMessage(message string) *EventID {
client, scope := hub.Client(), hub.Scope()
if client == nil || scope == nil {
return nil
}
eventID := client.CaptureMessage(message, nil, scope)
if eventID != nil {
hub.mu.Lock()
hub.lastEventID = *eventID
hub.mu.Unlock()
}
return eventID
}
// CaptureException calls the method of a same name on currently bound Client instance
// passing it a top-level Scope.
// Returns EventID if successfully, or nil if there's no Scope or Client available.
func (hub *Hub) CaptureException(exception error) *EventID {
client, scope := hub.Client(), hub.Scope()
if client == nil || scope == nil {
return nil
}
eventID := client.CaptureException(exception, &EventHint{OriginalException: exception}, scope)
if eventID != nil {
hub.mu.Lock()
hub.lastEventID = *eventID
hub.mu.Unlock()
}
return eventID
}
// CaptureCheckIn calls the method of the same name on currently bound Client instance
// passing it a top-level Scope.
// Returns CheckInID if the check-in was captured successfully, or nil otherwise.
func (hub *Hub) CaptureCheckIn(checkIn *CheckIn, monitorConfig *MonitorConfig) *EventID {
client, scope := hub.Client(), hub.Scope()
if client == nil {
return nil
}
return client.CaptureCheckIn(checkIn, monitorConfig, scope)
}
// AddBreadcrumb records a new breadcrumb.
//
// The total number of breadcrumbs that can be recorded are limited by the
// configuration on the client.
func (hub *Hub) AddBreadcrumb(breadcrumb *Breadcrumb, hint *BreadcrumbHint) {
client := hub.Client()
// If there's no client, just store it on the scope straight away
if client == nil {
hub.Scope().AddBreadcrumb(breadcrumb, maxBreadcrumbs)
return
}
max := client.options.MaxBreadcrumbs
switch {
case max < 0:
return
case max == 0:
max = defaultMaxBreadcrumbs
case max > maxBreadcrumbs:
max = maxBreadcrumbs
}
if client.options.BeforeBreadcrumb != nil {
if hint == nil {
hint = &BreadcrumbHint{}
}
if breadcrumb = client.options.BeforeBreadcrumb(breadcrumb, hint); breadcrumb == nil {
Logger.Println("breadcrumb dropped due to BeforeBreadcrumb callback.")
return
}
}
hub.Scope().AddBreadcrumb(breadcrumb, max)
}
// Recover calls the method of a same name on currently bound Client instance
// passing it a top-level Scope.
// Returns EventID if successfully, or nil if there's no Scope or Client available.
func (hub *Hub) Recover(err interface{}) *EventID {
if err == nil {
err = recover()
}
client, scope := hub.Client(), hub.Scope()
if client == nil || scope == nil {
return nil
}
return client.Recover(err, &EventHint{RecoveredException: err}, scope)
}
// RecoverWithContext calls the method of a same name on currently bound Client instance
// passing it a top-level Scope.
// Returns EventID if successfully, or nil if there's no Scope or Client available.
func (hub *Hub) RecoverWithContext(ctx context.Context, err interface{}) *EventID {
if err == nil {
err = recover()
}
client, scope := hub.Client(), hub.Scope()
if client == nil || scope == nil {
return nil
}
return client.RecoverWithContext(ctx, err, &EventHint{RecoveredException: err}, scope)
}
// Flush waits until the underlying Transport sends any buffered events to the
// Sentry server, blocking for at most the given timeout. It returns false if
// the timeout was reached. In that case, some events may not have been sent.
//
// Flush should be called before terminating the program to avoid
// unintentionally dropping events.
//
// Do not call Flush indiscriminately after every call to CaptureEvent,
// CaptureException or CaptureMessage. Instead, to have the SDK send events over
// the network synchronously, configure it to use the HTTPSyncTransport in the
// call to Init.
func (hub *Hub) Flush(timeout time.Duration) bool {
client := hub.Client()
if client == nil {
return false
}
return client.Flush(timeout)
}
// GetTraceparent returns the current Sentry traceparent string, to be used as a HTTP header value
// or HTML meta tag value.
// This function is context aware, as in it either returns the traceparent based
// on the current span, or the scope's propagation context.
func (hub *Hub) GetTraceparent() string {
scope := hub.Scope()
if scope.span != nil {
return scope.span.ToSentryTrace()
}
return fmt.Sprintf("%s-%s", scope.propagationContext.TraceID, scope.propagationContext.SpanID)
}
// GetBaggage returns the current Sentry baggage string, to be used as a HTTP header value
// or HTML meta tag value.
// This function is context aware, as in it either returns the baggage based
// on the current span or the scope's propagation context.
func (hub *Hub) GetBaggage() string {
scope := hub.Scope()
if scope.span != nil {
return scope.span.ToBaggage()
}
return scope.propagationContext.DynamicSamplingContext.String()
}
// HasHubOnContext checks whether Hub instance is bound to a given Context struct.
func HasHubOnContext(ctx context.Context) bool {
_, ok := ctx.Value(HubContextKey).(*Hub)
return ok
}
// GetHubFromContext tries to retrieve Hub instance from the given Context struct
// or return nil if one is not found.
func GetHubFromContext(ctx context.Context) *Hub {
if hub, ok := ctx.Value(HubContextKey).(*Hub); ok {
return hub
}
return nil
}
// hubFromContext returns either a hub stored in the context or the current hub.
// The return value is guaranteed to be non-nil, unlike GetHubFromContext.
func hubFromContext(ctx context.Context) *Hub {
if hub, ok := ctx.Value(HubContextKey).(*Hub); ok {
return hub
}
return currentHub
}
// SetHubOnContext stores given Hub instance on the Context struct and returns a new Context.
func SetHubOnContext(ctx context.Context, hub *Hub) context.Context {
return context.WithValue(ctx, HubContextKey, hub)
}