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Live: make maximum WebSocket message size configurable (#99770)

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Co-authored-by: Chris Marchbanks <chris.marchbanks@grafana.com>
This commit is contained in:
Ben Sully
2025-01-30 10:24:29 +00:00
committed by GitHub
parent 9d5af95565
commit 408e3e91a8
3 changed files with 18 additions and 5 deletions
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4
conf/defaults.ini
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@ -1803,6 +1803,10 @@ preinstall_disabled = false
# tuning. 0 disables Live, -1 means unlimited connections.
max_connections = 100
# message_size_limit is the maximum size in bytes of Websocket messages from clients. Defaults to 64KB.
# The limit can be disabled by setting it to -1.
message_size_limit = 65536
# allowed_origins is a comma-separated list of origins that can establish connection with Grafana Live.
# If not set then origin will be matched over root_url. Supports wildcard symbol "*".
allowed_origins =

12
pkg/services/live/live.go
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@ -269,12 +269,14 @@ func ProvideService(plugCtxProvider *plugincontext.Provider, cfg *setting.Cfg, r
originGlobs, _ := setting.GetAllowedOriginGlobs(originPatterns) // error already checked on config load.
checkOrigin := getCheckOriginFunc(appURL, originPatterns, originGlobs)
wsCfg := centrifuge.WebsocketConfig{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: checkOrigin,
MessageSizeLimit: cfg.LiveMessageSizeLimit,
}
// Use a pure websocket transport.
wsHandler := centrifuge.NewWebsocketHandler(node, centrifuge.WebsocketConfig{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: checkOrigin,
})
wsHandler := centrifuge.NewWebsocketHandler(node, wsCfg)
pushWSHandler := pushws.NewHandler(g.ManagedStreamRunner, pushws.Config{
ReadBufferSize: 1024,

7
pkg/setting/setting.go
View File

@ -435,6 +435,9 @@ type Cfg struct {
// LiveAllowedOrigins is a set of origins accepted by Live. If not provided
// then Live uses AppURL as the only allowed origin.
LiveAllowedOrigins []string
// LiveMessageSizeLimit is the maximum size in bytes of Websocket messages
// from clients. Defaults to 64KB.
LiveMessageSizeLimit int
// Grafana.com URL, used for OAuth redirect.
GrafanaComURL string
@ -1974,6 +1977,10 @@ func (cfg *Cfg) readLiveSettings(iniFile *ini.File) error {
if cfg.LiveMaxConnections < -1 {
return fmt.Errorf("unexpected value %d for [live] max_connections", cfg.LiveMaxConnections)
}
cfg.LiveMessageSizeLimit = section.Key("message_size_limit").MustInt(65536)
if cfg.LiveMessageSizeLimit < -1 {
return fmt.Errorf("unexpected value %d for [live] message_size_limit", cfg.LiveMaxConnections)
}
cfg.LiveHAEngine = section.Key("ha_engine").MustString("")
switch cfg.LiveHAEngine {
case "", "redis":