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scope.go
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scope.go
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package sentry
import (
"bytes"
"io"
"net/http"
"sync"
"time"
)
// Scope holds contextual data for the current scope.
//
// The scope is an object that can cloned efficiently and stores data that is
// locally relevant to an event. For instance the scope will hold recorded
// breadcrumbs and similar information.
//
// The scope can be interacted with in two ways. First, the scope is routinely
// updated with information by functions such as AddBreadcrumb which will modify
// the current scope. Second, the current scope can be configured through the
// ConfigureScope function or Hub method of the same name.
//
// The scope is meant to be modified but not inspected directly. When preparing
// an event for reporting, the current client adds information from the current
// scope into the event.
type Scope struct {
mu sync.RWMutex
breadcrumbs []*Breadcrumb
attachments []*Attachment
user User
tags map[string]string
contexts map[string]Context
extra map[string]interface{}
fingerprint []string
level Level
request *http.Request
// requestBody holds a reference to the original request.Body.
requestBody interface {
// Bytes returns bytes from the original body, lazily buffered as the
// original body is read.
Bytes() []byte
// Overflow returns true if the body is larger than the maximum buffer
// size.
Overflow() bool
}
eventProcessors []EventProcessor
}
// NewScope creates a new Scope.
func NewScope() *Scope {
scope := Scope{
breadcrumbs: make([]*Breadcrumb, 0),
attachments: make([]*Attachment, 0),
tags: make(map[string]string),
contexts: make(map[string]Context),
extra: make(map[string]interface{}),
fingerprint: make([]string, 0),
}
return &scope
}
// AddBreadcrumb adds new breadcrumb to the current scope
// and optionally throws the old one if limit is reached.
func (scope *Scope) AddBreadcrumb(breadcrumb *Breadcrumb, limit int) {
if breadcrumb.Timestamp.IsZero() {
breadcrumb.Timestamp = time.Now()
}
scope.mu.Lock()
defer scope.mu.Unlock()
scope.breadcrumbs = append(scope.breadcrumbs, breadcrumb)
if len(scope.breadcrumbs) > limit {
scope.breadcrumbs = scope.breadcrumbs[1 : limit+1]
}
}
// ClearBreadcrumbs clears all breadcrumbs from the current scope.
func (scope *Scope) ClearBreadcrumbs() {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.breadcrumbs = []*Breadcrumb{}
}
// AddAttachment adds new attachment to the current scope.
func (scope *Scope) AddAttachment(attachment *Attachment) {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.attachments = append(scope.attachments, attachment)
}
// ClearAttachments clears all attachments from the current scope.
func (scope *Scope) ClearAttachments() {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.attachments = []*Attachment{}
}
// SetUser sets the user for the current scope.
func (scope *Scope) SetUser(user User) {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.user = user
}
// SetRequest sets the request for the current scope.
func (scope *Scope) SetRequest(r *http.Request) {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.request = r
if r == nil {
return
}
// Don't buffer request body if we know it is oversized.
if r.ContentLength > maxRequestBodyBytes {
return
}
// Don't buffer if there is no body.
if r.Body == nil || r.Body == http.NoBody {
return
}
buf := &limitedBuffer{Capacity: maxRequestBodyBytes}
r.Body = readCloser{
Reader: io.TeeReader(r.Body, buf),
Closer: r.Body,
}
scope.requestBody = buf
}
// SetRequestBody sets the request body for the current scope.
//
// This method should only be called when the body bytes are already available
// in memory. Typically, the request body is buffered lazily from the
// Request.Body from SetRequest.
func (scope *Scope) SetRequestBody(b []byte) {
scope.mu.Lock()
defer scope.mu.Unlock()
capacity := maxRequestBodyBytes
overflow := false
if len(b) > capacity {
overflow = true
b = b[:capacity]
}
scope.requestBody = &limitedBuffer{
Capacity: capacity,
Buffer: *bytes.NewBuffer(b),
overflow: overflow,
}
}
// maxRequestBodyBytes is the default maximum request body size to send to
// Sentry.
const maxRequestBodyBytes = 10 * 1024
// A limitedBuffer is like a bytes.Buffer, but limited to store at most Capacity
// bytes. Any writes past the capacity are silently discarded, similar to
// io.Discard.
type limitedBuffer struct {
Capacity int
bytes.Buffer
overflow bool
}
// Write implements io.Writer.
func (b *limitedBuffer) Write(p []byte) (n int, err error) {
// Silently ignore writes after overflow.
if b.overflow {
return len(p), nil
}
left := b.Capacity - b.Len()
if left < 0 {
left = 0
}
if len(p) > left {
b.overflow = true
p = p[:left]
}
return b.Buffer.Write(p)
}
// Overflow returns true if the limitedBuffer discarded bytes written to it.
func (b *limitedBuffer) Overflow() bool {
return b.overflow
}
// readCloser combines an io.Reader and an io.Closer to implement io.ReadCloser.
type readCloser struct {
io.Reader
io.Closer
}
// SetTag adds a tag to the current scope.
func (scope *Scope) SetTag(key, value string) {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.tags[key] = value
}
// SetTags assigns multiple tags to the current scope.
func (scope *Scope) SetTags(tags map[string]string) {
scope.mu.Lock()
defer scope.mu.Unlock()
for k, v := range tags {
scope.tags[k] = v
}
}
// RemoveTag removes a tag from the current scope.
func (scope *Scope) RemoveTag(key string) {
scope.mu.Lock()
defer scope.mu.Unlock()
delete(scope.tags, key)
}
// SetContext adds a context to the current scope.
func (scope *Scope) SetContext(key string, value Context) {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.contexts[key] = value
}
// SetContexts assigns multiple contexts to the current scope.
func (scope *Scope) SetContexts(contexts map[string]Context) {
scope.mu.Lock()
defer scope.mu.Unlock()
for k, v := range contexts {
scope.contexts[k] = v
}
}
// RemoveContext removes a context from the current scope.
func (scope *Scope) RemoveContext(key string) {
scope.mu.Lock()
defer scope.mu.Unlock()
delete(scope.contexts, key)
}
// SetExtra adds an extra to the current scope.
func (scope *Scope) SetExtra(key string, value interface{}) {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.extra[key] = value
}
// SetExtras assigns multiple extras to the current scope.
func (scope *Scope) SetExtras(extra map[string]interface{}) {
scope.mu.Lock()
defer scope.mu.Unlock()
for k, v := range extra {
scope.extra[k] = v
}
}
// RemoveExtra removes a extra from the current scope.
func (scope *Scope) RemoveExtra(key string) {
scope.mu.Lock()
defer scope.mu.Unlock()
delete(scope.extra, key)
}
// SetFingerprint sets new fingerprint for the current scope.
func (scope *Scope) SetFingerprint(fingerprint []string) {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.fingerprint = fingerprint
}
// SetLevel sets new level for the current scope.
func (scope *Scope) SetLevel(level Level) {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.level = level
}
// Clone returns a copy of the current scope with all data copied over.
func (scope *Scope) Clone() *Scope {
scope.mu.RLock()
defer scope.mu.RUnlock()
clone := NewScope()
clone.user = scope.user
clone.breadcrumbs = make([]*Breadcrumb, len(scope.breadcrumbs))
copy(clone.breadcrumbs, scope.breadcrumbs)
clone.attachments = make([]*Attachment, len(scope.attachments))
copy(clone.attachments, scope.attachments)
for key, value := range scope.tags {
clone.tags[key] = value
}
for key, value := range scope.contexts {
clone.contexts[key] = cloneContext(value)
}
for key, value := range scope.extra {
clone.extra[key] = value
}
clone.fingerprint = make([]string, len(scope.fingerprint))
copy(clone.fingerprint, scope.fingerprint)
clone.level = scope.level
clone.request = scope.request
clone.requestBody = scope.requestBody
clone.eventProcessors = scope.eventProcessors
return clone
}
// Clear removes the data from the current scope. Not safe for concurrent use.
func (scope *Scope) Clear() {
*scope = *NewScope()
}
// AddEventProcessor adds an event processor to the current scope.
func (scope *Scope) AddEventProcessor(processor EventProcessor) {
scope.mu.Lock()
defer scope.mu.Unlock()
scope.eventProcessors = append(scope.eventProcessors, processor)
}
// ApplyToEvent takes the data from the current scope and attaches it to the event.
func (scope *Scope) ApplyToEvent(event *Event, hint *EventHint) *Event {
scope.mu.RLock()
defer scope.mu.RUnlock()
if len(scope.breadcrumbs) > 0 {
event.Breadcrumbs = append(event.Breadcrumbs, scope.breadcrumbs...)
}
if len(scope.attachments) > 0 {
event.attachments = append(event.attachments, scope.attachments...)
}
if len(scope.tags) > 0 {
if event.Tags == nil {
event.Tags = make(map[string]string, len(scope.tags))
}
for key, value := range scope.tags {
event.Tags[key] = value
}
}
if len(scope.contexts) > 0 {
if event.Contexts == nil {
event.Contexts = make(map[string]Context)
}
for key, value := range scope.contexts {
if key == "trace" && event.Type == transactionType {
// Do not override trace context of
// transactions, otherwise it breaks the
// transaction event representation.
// For error events, the trace context is used
// to link errors and traces/spans in Sentry.
continue
}
// Ensure we are not overwriting event fields
if _, ok := event.Contexts[key]; !ok {
event.Contexts[key] = cloneContext(value)
}
}
}
if len(scope.extra) > 0 {
if event.Extra == nil {
event.Extra = make(map[string]interface{}, len(scope.extra))
}
for key, value := range scope.extra {
event.Extra[key] = value
}
}
if event.User.IsEmpty() {
event.User = scope.user
}
if len(event.Fingerprint) == 0 {
event.Fingerprint = append(event.Fingerprint, scope.fingerprint...)
}
if scope.level != "" {
event.Level = scope.level
}
if event.Request == nil && scope.request != nil {
event.Request = NewRequest(scope.request)
// NOTE: The SDK does not attempt to send partial request body data.
//
// The reason being that Sentry's ingest pipeline and UI are optimized
// to show structured data. Additionally, tooling around PII scrubbing
// relies on structured data; truncated request bodies would create
// invalid payloads that are more prone to leaking PII data.
//
// Users can still send more data along their events if they want to,
// for example using Event.Extra.
if scope.requestBody != nil && !scope.requestBody.Overflow() {
event.Request.Data = string(scope.requestBody.Bytes())
}
}
for _, processor := range scope.eventProcessors {
id := event.EventID
event = processor(event, hint)
if event == nil {
Logger.Printf("Event dropped by one of the Scope EventProcessors: %s\n", id)
return nil
}
}
return event
}
// cloneContext returns a new context with keys and values copied from the passed one.
//
// Note: a new Context (map) is returned, but the function does NOT do
// a proper deep copy: if some context values are pointer types (e.g. maps),
// they won't be properly copied.
func cloneContext(c Context) Context {
res := Context{}
for k, v := range c {
res[k] = v
}
return res
}