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forgejo/modules/nosql/manager_redis.go
zeripath c88547ce71
Add Goroutine stack inspector to admin/monitor (#19207)
Continues on from #19202.

Following the addition of pprof labels we can now more easily understand the relationship between a goroutine and the requests that spawn them. 

This PR takes advantage of the labels and adds a few others, then provides a mechanism for the monitoring page to query the pprof goroutine profile.

The binary profile that results from this profile is immediately piped in to the google library for parsing this and then stack traces are formed for the goroutines.

If the goroutine is within a context or has been created from a goroutine within a process context it will acquire the process description labels for that process. 

The goroutines are mapped with there associate pids and any that do not have an associated pid are placed in a group at the bottom as unbound.

In this way we should be able to more easily examine goroutines that have been stuck.

A manager command `gitea manager processes` is also provided that can export the processes (with or without stacktraces) to the command line.

Signed-off-by: Andrew Thornton <art27@cantab.net>
2022-03-31 19:01:43 +02:00

263 lines
7.1 KiB
Go

// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package nosql
import (
"crypto/tls"
"net/url"
"path"
"runtime/pprof"
"strconv"
"strings"
"code.gitea.io/gitea/modules/log"
"github.com/go-redis/redis/v8"
)
var replacer = strings.NewReplacer("_", "", "-", "")
// CloseRedisClient closes a redis client
func (m *Manager) CloseRedisClient(connection string) error {
m.mutex.Lock()
defer m.mutex.Unlock()
client, ok := m.RedisConnections[connection]
if !ok {
connection = ToRedisURI(connection).String()
client, ok = m.RedisConnections[connection]
}
if !ok {
return nil
}
client.count--
if client.count > 0 {
return nil
}
for _, name := range client.name {
delete(m.RedisConnections, name)
}
return client.UniversalClient.Close()
}
// GetRedisClient gets a redis client for a particular connection
func (m *Manager) GetRedisClient(connection string) (client redis.UniversalClient) {
// Because we want associate any goroutines created by this call to the main nosqldb context we need to
// wrap this in a goroutine labelled with the nosqldb context
done := make(chan struct{})
var recovered interface{}
go func() {
defer func() {
recovered = recover()
if recovered != nil {
log.Critical("PANIC during GetRedisClient: %v\nStacktrace: %s", recovered, log.Stack(2))
}
close(done)
}()
pprof.SetGoroutineLabels(m.ctx)
client = m.getRedisClient(connection)
}()
<-done
if recovered != nil {
panic(recovered)
}
return
}
func (m *Manager) getRedisClient(connection string) redis.UniversalClient {
m.mutex.Lock()
defer m.mutex.Unlock()
client, ok := m.RedisConnections[connection]
if ok {
client.count++
return client
}
uri := ToRedisURI(connection)
client, ok = m.RedisConnections[uri.String()]
if ok {
client.count++
return client
}
client = &redisClientHolder{
name: []string{connection, uri.String()},
}
opts := getRedisOptions(uri)
tlsConfig := getRedisTLSOptions(uri)
clientName := uri.Query().Get("clientname")
if len(clientName) > 0 {
client.name = append(client.name, clientName)
}
switch uri.Scheme {
case "redis+sentinels":
fallthrough
case "rediss+sentinel":
opts.TLSConfig = tlsConfig
fallthrough
case "redis+sentinel":
client.UniversalClient = redis.NewFailoverClient(opts.Failover())
case "redis+clusters":
fallthrough
case "rediss+cluster":
opts.TLSConfig = tlsConfig
fallthrough
case "redis+cluster":
client.UniversalClient = redis.NewClusterClient(opts.Cluster())
case "redis+socket":
simpleOpts := opts.Simple()
simpleOpts.Network = "unix"
simpleOpts.Addr = path.Join(uri.Host, uri.Path)
client.UniversalClient = redis.NewClient(simpleOpts)
case "rediss":
opts.TLSConfig = tlsConfig
fallthrough
case "redis":
client.UniversalClient = redis.NewClient(opts.Simple())
default:
return nil
}
for _, name := range client.name {
m.RedisConnections[name] = client
}
client.count++
return client
}
// getRedisOptions pulls various configuration options based on the RedisUri format and converts them to go-redis's
// UniversalOptions fields. This function explicitly excludes fields related to TLS configuration, which is
// conditionally attached to this options struct before being converted to the specific type for the redis scheme being
// used, and only in scenarios where TLS is applicable (e.g. rediss://, redis+clusters://).
func getRedisOptions(uri *url.URL) *redis.UniversalOptions {
opts := &redis.UniversalOptions{}
// Handle username/password
if password, ok := uri.User.Password(); ok {
opts.Password = password
// Username does not appear to be handled by redis.Options
opts.Username = uri.User.Username()
} else if uri.User.Username() != "" {
// assume this is the password
opts.Password = uri.User.Username()
}
// Now handle the uri query sets
for k, v := range uri.Query() {
switch replacer.Replace(strings.ToLower(k)) {
case "addr":
opts.Addrs = append(opts.Addrs, v...)
case "addrs":
opts.Addrs = append(opts.Addrs, strings.Split(v[0], ",")...)
case "username":
opts.Username = v[0]
case "password":
opts.Password = v[0]
case "database":
fallthrough
case "db":
opts.DB, _ = strconv.Atoi(v[0])
case "maxretries":
opts.MaxRetries, _ = strconv.Atoi(v[0])
case "minretrybackoff":
opts.MinRetryBackoff = valToTimeDuration(v)
case "maxretrybackoff":
opts.MaxRetryBackoff = valToTimeDuration(v)
case "timeout":
timeout := valToTimeDuration(v)
if timeout != 0 {
if opts.DialTimeout == 0 {
opts.DialTimeout = timeout
}
if opts.ReadTimeout == 0 {
opts.ReadTimeout = timeout
}
}
case "dialtimeout":
opts.DialTimeout = valToTimeDuration(v)
case "readtimeout":
opts.ReadTimeout = valToTimeDuration(v)
case "writetimeout":
opts.WriteTimeout = valToTimeDuration(v)
case "poolsize":
opts.PoolSize, _ = strconv.Atoi(v[0])
case "minidleconns":
opts.MinIdleConns, _ = strconv.Atoi(v[0])
case "pooltimeout":
opts.PoolTimeout = valToTimeDuration(v)
case "idletimeout":
opts.IdleTimeout = valToTimeDuration(v)
case "idlecheckfrequency":
opts.IdleCheckFrequency = valToTimeDuration(v)
case "maxredirects":
opts.MaxRedirects, _ = strconv.Atoi(v[0])
case "readonly":
opts.ReadOnly, _ = strconv.ParseBool(v[0])
case "routebylatency":
opts.RouteByLatency, _ = strconv.ParseBool(v[0])
case "routerandomly":
opts.RouteRandomly, _ = strconv.ParseBool(v[0])
case "sentinelmasterid":
fallthrough
case "mastername":
opts.MasterName = v[0]
case "sentinelusername":
opts.SentinelUsername = v[0]
case "sentinelpassword":
opts.SentinelPassword = v[0]
}
}
if uri.Host != "" {
opts.Addrs = append(opts.Addrs, strings.Split(uri.Host, ",")...)
}
// A redis connection string uses the path section of the URI in two different ways. In a TCP-based connection, the
// path will be a database index to automatically have the client SELECT. In a Unix socket connection, it will be the
// file path. We only want to try to coerce this to the database index when we're not expecting a file path so that
// the error log stays clean.
if uri.Path != "" && uri.Scheme != "redis+socket" {
if db, err := strconv.Atoi(uri.Path[1:]); err == nil {
opts.DB = db
} else {
log.Error("Provided database identifier '%s' is not a valid integer. Gitea will ignore this option.", uri.Path)
}
}
return opts
}
// getRedisTlsOptions parses RedisUri TLS configuration parameters and converts them to the go TLS configuration
// equivalent fields.
func getRedisTLSOptions(uri *url.URL) *tls.Config {
tlsConfig := &tls.Config{}
skipverify := uri.Query().Get("skipverify")
if len(skipverify) > 0 {
skipverify, err := strconv.ParseBool(skipverify)
if err != nil {
tlsConfig.InsecureSkipVerify = skipverify
}
}
insecureskipverify := uri.Query().Get("insecureskipverify")
if len(insecureskipverify) > 0 {
insecureskipverify, err := strconv.ParseBool(insecureskipverify)
if err != nil {
tlsConfig.InsecureSkipVerify = insecureskipverify
}
}
return tlsConfig
}