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woodpecker/vendor/github.com/getsentry/raven-go/client.go
2015-09-29 18:21:17 -07:00

683 lines
18 KiB
Go

// Package raven implements a client for the Sentry error logging service.
package raven
import (
"bytes"
"compress/zlib"
"crypto/rand"
"encoding/base64"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"runtime"
"strings"
"sync"
"time"
)
const (
userAgent = "raven-go/1.0"
timestampFormat = `"2006-01-02T15:04:05"`
)
var (
ErrPacketDropped = errors.New("raven: packet dropped")
ErrUnableToUnmarshalJSON = errors.New("raven: unable to unmarshal JSON")
ErrMissingUser = errors.New("raven: dsn missing public key and/or password")
ErrMissingPrivateKey = errors.New("raven: dsn missing private key")
ErrMissingProjectID = errors.New("raven: dsn missing project id")
)
type Severity string
// http://docs.python.org/2/howto/logging.html#logging-levels
const (
DEBUG = Severity("debug")
INFO = Severity("info")
WARNING = Severity("warning")
ERROR = Severity("error")
FATAL = Severity("fatal")
)
type Timestamp time.Time
func (t Timestamp) MarshalJSON() ([]byte, error) {
return []byte(time.Time(t).UTC().Format(timestampFormat)), nil
}
func (timestamp *Timestamp) UnmarshalJSON(data []byte) error {
t, err := time.Parse(timestampFormat, string(data))
if err != nil {
return err
}
*timestamp = Timestamp(t)
return nil
}
// An Interface is a Sentry interface that will be serialized as JSON.
// It must implement json.Marshaler or use json struct tags.
type Interface interface {
// The Sentry class name. Example: sentry.interfaces.Stacktrace
Class() string
}
type Culpriter interface {
Culprit() string
}
type Transport interface {
Send(url, authHeader string, packet *Packet) error
}
type outgoingPacket struct {
packet *Packet
ch chan error
}
type Tag struct {
Key string
Value string
}
type Tags []Tag
func (tag *Tag) MarshalJSON() ([]byte, error) {
return json.Marshal([2]string{tag.Key, tag.Value})
}
func (t *Tag) UnmarshalJSON(data []byte) error {
var tag [2]string
if err := json.Unmarshal(data, &tag); err != nil {
return err
}
*t = Tag{tag[0], tag[1]}
return nil
}
func (t *Tags) UnmarshalJSON(data []byte) error {
var tags []Tag
switch data[0] {
case '[':
// Unmarshal into []Tag
if err := json.Unmarshal(data, &tags); err != nil {
return err
}
case '{':
// Unmarshal into map[string]string
tagMap := make(map[string]string)
if err := json.Unmarshal(data, &tagMap); err != nil {
return err
}
// Convert to []Tag
for k, v := range tagMap {
tags = append(tags, Tag{k, v})
}
default:
return ErrUnableToUnmarshalJSON
}
*t = tags
return nil
}
// http://sentry.readthedocs.org/en/latest/developer/client/index.html#building-the-json-packet
type Packet struct {
// Required
Message string `json:"message"`
// Required, set automatically by Client.Send/Report via Packet.Init if blank
EventID string `json:"event_id"`
Project string `json:"project"`
Timestamp Timestamp `json:"timestamp"`
Level Severity `json:"level"`
Logger string `json:"logger"`
// Optional
Platform string `json:"platform,omitempty"`
Culprit string `json:"culprit,omitempty"`
ServerName string `json:"server_name,omitempty"`
Release string `json:"release,omitempty"`
Tags Tags `json:"tags,omitempty"`
Modules []map[string]string `json:"modules,omitempty"`
Extra map[string]interface{} `json:"extra,omitempty"`
Interfaces []Interface `json:"-"`
}
// NewPacket constructs a packet with the specified message and interfaces.
func NewPacket(message string, interfaces ...Interface) *Packet {
extra := map[string]interface{}{
"runtime.Version": runtime.Version(),
"runtime.NumCPU": runtime.NumCPU(),
"runtime.GOMAXPROCS": runtime.GOMAXPROCS(0), // 0 just returns the current value
"runtime.NumGoroutine": runtime.NumGoroutine(),
}
return &Packet{
Message: message,
Interfaces: interfaces,
Extra: extra,
}
}
// Init initializes required fields in a packet. It is typically called by
// Client.Send/Report automatically.
func (packet *Packet) Init(project string) error {
if packet.Project == "" {
packet.Project = project
}
if packet.EventID == "" {
var err error
packet.EventID, err = uuid()
if err != nil {
return err
}
}
if time.Time(packet.Timestamp).IsZero() {
packet.Timestamp = Timestamp(time.Now())
}
if packet.Level == "" {
packet.Level = ERROR
}
if packet.Logger == "" {
packet.Logger = "root"
}
if packet.ServerName == "" {
packet.ServerName = hostname
}
if packet.Platform == "" {
packet.Platform = "go"
}
if packet.Culprit == "" {
for _, inter := range packet.Interfaces {
if c, ok := inter.(Culpriter); ok {
packet.Culprit = c.Culprit()
if packet.Culprit != "" {
break
}
}
}
}
return nil
}
func (packet *Packet) AddTags(tags map[string]string) {
for k, v := range tags {
packet.Tags = append(packet.Tags, Tag{k, v})
}
}
func uuid() (string, error) {
id := make([]byte, 16)
_, err := io.ReadFull(rand.Reader, id)
if err != nil {
return "", err
}
id[6] &= 0x0F // clear version
id[6] |= 0x40 // set version to 4 (random uuid)
id[8] &= 0x3F // clear variant
id[8] |= 0x80 // set to IETF variant
return hex.EncodeToString(id), nil
}
func (packet *Packet) JSON() []byte {
packetJSON, _ := json.Marshal(packet)
interfaces := make(map[string]Interface, len(packet.Interfaces))
for _, inter := range packet.Interfaces {
interfaces[inter.Class()] = inter
}
if len(interfaces) > 0 {
interfaceJSON, _ := json.Marshal(interfaces)
packetJSON[len(packetJSON)-1] = ','
packetJSON = append(packetJSON, interfaceJSON[1:]...)
}
return packetJSON
}
type context struct {
user *User
http *Http
tags map[string]string
}
func (c *context) SetUser(u *User) { c.user = u }
func (c *context) SetHttp(h *Http) { c.http = h }
func (c *context) SetTags(t map[string]string) {
if c.tags == nil {
c.tags = make(map[string]string)
}
for k, v := range t {
c.tags[k] = v
}
}
func (c *context) Clear() {
c.user = nil
c.http = nil
c.tags = nil
}
// Return a list of interfaces to be used in appending with the rest
func (c *context) interfaces() []Interface {
len, i := 0, 0
if c.user != nil {
len++
}
if c.http != nil {
len++
}
interfaces := make([]Interface, len)
if c.user != nil {
interfaces[i] = c.user
i++
}
if c.http != nil {
interfaces[i] = c.http
i++
}
return interfaces
}
// The maximum number of packets that will be buffered waiting to be delivered.
// Packets will be dropped if the buffer is full. Used by NewClient.
var MaxQueueBuffer = 100
func newClient(tags map[string]string) *Client {
client := &Client{
Transport: &HTTPTransport{},
Tags: tags,
context: &context{},
queue: make(chan *outgoingPacket, MaxQueueBuffer),
}
go client.worker()
client.SetDSN(os.Getenv("SENTRY_DSN"))
return client
}
// New constructs a new Sentry client instance
func New(dsn string) (*Client, error) {
client := newClient(nil)
return client, client.SetDSN(dsn)
}
// NewWithTags constructs a new Sentry client instance with default tags.
func NewWithTags(dsn string, tags map[string]string) (*Client, error) {
client := newClient(tags)
return client, client.SetDSN(dsn)
}
// NewClient constructs a Sentry client and spawns a background goroutine to
// handle packets sent by Client.Report.
//
// Deprecated: use New and NewWithTags instead
func NewClient(dsn string, tags map[string]string) (*Client, error) {
client := newClient(tags)
return client, client.SetDSN(dsn)
}
// Client encapsulates a connection to a Sentry server. It must be initialized
// by calling NewClient. Modification of fields concurrently with Send or after
// calling Report for the first time is not thread-safe.
type Client struct {
Tags map[string]string
Transport Transport
// DropHandler is called when a packet is dropped because the buffer is full.
DropHandler func(*Packet)
// Context that will get appending to all packets
context *context
mu sync.RWMutex
url string
projectID string
authHeader string
release string
queue chan *outgoingPacket
// A WaitGroup to keep track of all currently in-progress captures
// This is intended to be used with Client.Wait() to assure that
// all messages have been transported before exiting the process.
wg sync.WaitGroup
}
// Initialize a default *Client instance
var DefaultClient = newClient(nil)
// SetDSN updates a client with a new DSN. It safe to call after and
// concurrently with calls to Report and Send.
func (client *Client) SetDSN(dsn string) error {
if dsn == "" {
return nil
}
client.mu.Lock()
defer client.mu.Unlock()
uri, err := url.Parse(dsn)
if err != nil {
return err
}
if uri.User == nil {
return ErrMissingUser
}
publicKey := uri.User.Username()
secretKey, ok := uri.User.Password()
if !ok {
return ErrMissingPrivateKey
}
uri.User = nil
if idx := strings.LastIndex(uri.Path, "/"); idx != -1 {
client.projectID = uri.Path[idx+1:]
uri.Path = uri.Path[:idx+1] + "api/" + client.projectID + "/store/"
}
if client.projectID == "" {
return ErrMissingProjectID
}
client.url = uri.String()
client.authHeader = fmt.Sprintf("Sentry sentry_version=4, sentry_key=%s, sentry_secret=%s", publicKey, secretKey)
return nil
}
// Sets the DSN for the default *Client instance
func SetDSN(dsn string) error { return DefaultClient.SetDSN(dsn) }
// SetRelease sets the "release" tag.
func (client *Client) SetRelease(release string) {
client.mu.Lock()
defer client.mu.Unlock()
client.release = release
}
// SetRelease sets the "release" tag on the default *Client
func SetRelease(release string) { DefaultClient.SetRelease(release) }
func (client *Client) worker() {
for outgoingPacket := range client.queue {
client.mu.RLock()
url, authHeader := client.url, client.authHeader
client.mu.RUnlock()
outgoingPacket.ch <- client.Transport.Send(url, authHeader, outgoingPacket.packet)
client.wg.Done()
}
}
// Capture asynchronously delivers a packet to the Sentry server. It is a no-op
// when client is nil. A channel is provided if it is important to check for a
// send's success.
func (client *Client) Capture(packet *Packet, captureTags map[string]string) (eventID string, ch chan error) {
if client == nil {
return
}
// Keep track of all running Captures so that we can wait for them all to finish
// *Must* call client.wg.Done() on any path that indicates that an event was
// finished being acted upon, whether success or failure
client.wg.Add(1)
ch = make(chan error, 1)
// Merge capture tags and client tags
packet.AddTags(captureTags)
packet.AddTags(client.Tags)
packet.AddTags(client.context.tags)
// Initialize any required packet fields
client.mu.RLock()
projectID := client.projectID
release := client.release
client.mu.RUnlock()
err := packet.Init(projectID)
if err != nil {
ch <- err
client.wg.Done()
return
}
packet.Release = release
outgoingPacket := &outgoingPacket{packet, ch}
select {
case client.queue <- outgoingPacket:
default:
// Send would block, drop the packet
if client.DropHandler != nil {
client.DropHandler(packet)
}
ch <- ErrPacketDropped
client.wg.Done()
}
return packet.EventID, ch
}
// Capture asynchronously delivers a packet to the Sentry server with the default *Client.
// It is a no-op when client is nil. A channel is provided if it is important to check for a
// send's success.
func Capture(packet *Packet, captureTags map[string]string) (eventID string, ch chan error) {
return DefaultClient.Capture(packet, captureTags)
}
// CaptureMessage formats and delivers a string message to the Sentry server.
func (client *Client) CaptureMessage(message string, tags map[string]string, interfaces ...Interface) string {
if client == nil {
return ""
}
packet := NewPacket(message, append(append(interfaces, client.context.interfaces()...), &Message{message, nil})...)
eventID, _ := client.Capture(packet, tags)
return eventID
}
// CaptureMessage formats and delivers a string message to the Sentry server with the default *Client
func CaptureMessage(message string, tags map[string]string, interfaces ...Interface) string {
return DefaultClient.CaptureMessage(message, tags, interfaces...)
}
// CaptureMessageAndWait is identical to CaptureMessage except it blocks and waits for the message to be sent.
func (client *Client) CaptureMessageAndWait(message string, tags map[string]string, interfaces ...Interface) string {
if client == nil {
return ""
}
packet := NewPacket(message, append(append(interfaces, client.context.interfaces()...), &Message{message, nil})...)
eventID, ch := client.Capture(packet, tags)
<-ch
return eventID
}
// CaptureMessageAndWait is identical to CaptureMessage except it blocks and waits for the message to be sent.
func CaptureMessageAndWait(message string, tags map[string]string, interfaces ...Interface) string {
return DefaultClient.CaptureMessageAndWait(message, tags, interfaces...)
}
// CaptureErrors formats and delivers an error to the Sentry server.
// Adds a stacktrace to the packet, excluding the call to this method.
func (client *Client) CaptureError(err error, tags map[string]string, interfaces ...Interface) string {
if client == nil {
return ""
}
packet := NewPacket(err.Error(), append(append(interfaces, client.context.interfaces()...), NewException(err, NewStacktrace(1, 3, nil)))...)
eventID, _ := client.Capture(packet, tags)
return eventID
}
// CaptureErrors formats and delivers an error to the Sentry server using the default *Client.
// Adds a stacktrace to the packet, excluding the call to this method.
func CaptureError(err error, tags map[string]string, interfaces ...Interface) string {
return DefaultClient.CaptureError(err, tags, interfaces...)
}
// CaptureErrorAndWait is identical to CaptureError, except it blocks and assures that the event was sent
func (client *Client) CaptureErrorAndWait(err error, tags map[string]string, interfaces ...Interface) string {
if client == nil {
return ""
}
packet := NewPacket(err.Error(), append(append(interfaces, client.context.interfaces()...), NewException(err, NewStacktrace(1, 3, nil)))...)
eventID, ch := client.Capture(packet, tags)
<-ch
return eventID
}
// CaptureErrorAndWait is identical to CaptureError, except it blocks and assures that the event was sent
func CaptureErrorAndWait(err error, tags map[string]string, interfaces ...Interface) string {
return DefaultClient.CaptureErrorAndWait(err, tags, interfaces...)
}
// CapturePanic calls f and then recovers and reports a panic to the Sentry server if it occurs.
func (client *Client) CapturePanic(f func(), tags map[string]string, interfaces ...Interface) {
// Note: This doesn't need to check for client, because we still want to go through the defer/recover path
// Down the line, Capture will be noop'd, so while this does a _tiny_ bit of overhead constructing the
// *Packet just to be thrown away, this should not be the normal case. Could be refactored to
// be completely noop though if we cared.
defer func() {
var packet *Packet
switch rval := recover().(type) {
case nil:
return
case error:
packet = NewPacket(rval.Error(), append(append(interfaces, client.context.interfaces()...), NewException(rval, NewStacktrace(2, 3, nil)))...)
default:
rvalStr := fmt.Sprint(rval)
packet = NewPacket(rvalStr, append(append(interfaces, client.context.interfaces()...), NewException(errors.New(rvalStr), NewStacktrace(2, 3, nil)))...)
}
client.Capture(packet, tags)
}()
f()
}
// CapturePanic calls f and then recovers and reports a panic to the Sentry server if it occurs.
func CapturePanic(f func(), tags map[string]string, interfaces ...Interface) {
DefaultClient.CapturePanic(f, tags, interfaces...)
}
func (client *Client) Close() {
close(client.queue)
}
func Close() { DefaultClient.Close() }
// Wait blocks and waits for all events to finish being sent to Sentry server
func (client *Client) Wait() {
client.wg.Wait()
}
// Wait blocks and waits for all events to finish being sent to Sentry server
func Wait() { DefaultClient.Wait() }
func (client *Client) URL() string {
client.mu.RLock()
defer client.mu.RUnlock()
return client.url
}
func URL() string { return DefaultClient.URL() }
func (client *Client) ProjectID() string {
client.mu.RLock()
defer client.mu.RUnlock()
return client.projectID
}
func ProjectID() string { return DefaultClient.ProjectID() }
func (client *Client) Release() string {
client.mu.RLock()
defer client.mu.RUnlock()
return client.release
}
func Release() string { return DefaultClient.Release() }
func (c *Client) SetUserContext(u *User) { c.context.SetUser(u) }
func (c *Client) SetHttpContext(h *Http) { c.context.SetHttp(h) }
func (c *Client) SetTagsContext(t map[string]string) { c.context.SetTags(t) }
func (c *Client) ClearContext() { c.context.Clear() }
func SetUserContext(u *User) { DefaultClient.SetUserContext(u) }
func SetHttpContext(h *Http) { DefaultClient.SetHttpContext(h) }
func SetTagsContext(t map[string]string) { DefaultClient.SetTagsContext(t) }
func ClearContext() { DefaultClient.ClearContext() }
// HTTPTransport is the default transport, delivering packets to Sentry via the
// HTTP API.
type HTTPTransport struct {
Http http.Client
}
func (t *HTTPTransport) Send(url, authHeader string, packet *Packet) error {
if url == "" {
return nil
}
body, contentType := serializedPacket(packet)
req, _ := http.NewRequest("POST", url, body)
req.Header.Set("X-Sentry-Auth", authHeader)
req.Header.Set("User-Agent", userAgent)
req.Header.Set("Content-Type", contentType)
res, err := t.Http.Do(req)
if err != nil {
return err
}
io.Copy(ioutil.Discard, res.Body)
res.Body.Close()
if res.StatusCode != 200 {
return fmt.Errorf("raven: got http status %d", res.StatusCode)
}
return nil
}
func serializedPacket(packet *Packet) (r io.Reader, contentType string) {
packetJSON := packet.JSON()
// Only deflate/base64 the packet if it is bigger than 1KB, as there is
// overhead.
if len(packetJSON) > 1000 {
buf := &bytes.Buffer{}
b64 := base64.NewEncoder(base64.StdEncoding, buf)
deflate, _ := zlib.NewWriterLevel(b64, zlib.BestCompression)
deflate.Write(packetJSON)
deflate.Close()
b64.Close()
return buf, "application/octet-stream"
}
return bytes.NewReader(packetJSON), "application/json"
}
var hostname string
func init() {
hostname, _ = os.Hostname()
}