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Enhancement: Better Health Checks (#125)
* better health check service * fix linter * added feedback * removed replace socket conn
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Tíghearnán Carroll
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Feb 25, 2022
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| package dpp | ||
|
|
||
| import ( | ||
| "context" | ||
| "net/url" | ||
| "time" | ||
|
|
||
| "github.com/InVisionApp/go-health/v2" | ||
| "github.com/libsv/payd" | ||
| "github.com/libsv/payd/config" | ||
| "github.com/pkg/errors" | ||
| "github.com/theflyingcodr/lathos" | ||
| "github.com/theflyingcodr/sockets" | ||
| "github.com/theflyingcodr/sockets/client" | ||
| ) | ||
|
|
||
| type healthCheck struct { | ||
| h health.IHealth | ||
| c *client.Client | ||
| cfg *config.P4 | ||
| invSvc payd.InvoiceService | ||
| connSvc payd.ConnectService | ||
| } | ||
|
|
||
| // NewHealthCheck return a new DPP health check. | ||
| func NewHealthCheck(h health.IHealth, c *client.Client, invSvc payd.InvoiceService, connSvc payd.ConnectService, cfg *config.P4) payd.HealthCheck { | ||
| return &healthCheck{ | ||
| h: h, | ||
| c: c, | ||
| cfg: cfg, | ||
| invSvc: invSvc, | ||
| connSvc: connSvc, | ||
| } | ||
| } | ||
|
|
||
| // Start the health check. | ||
| func (h *healthCheck) Start() error { | ||
| u, err := url.Parse(h.cfg.ServerHost) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if u.Scheme != "ws" && u.Scheme != "wss" { | ||
| return nil | ||
| } | ||
|
|
||
| if err := h.commsCheck(); err != nil { | ||
| return errors.Wrap(err, "failed to start comms health check") | ||
| } | ||
| if err := h.channelCheck(); err != nil { | ||
| return errors.Wrap(err, "failed to start channel health check") | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (h *healthCheck) commsCheck() error { | ||
| if err := h.h.AddCheck(&health.Config{ | ||
| Name: "p4-comms", | ||
| Checker: &commsCheck{ | ||
| c: h.c, | ||
| host: h.cfg.ServerHost, | ||
| }, | ||
| Interval: time.Duration(2) * time.Second, | ||
| }); err != nil { | ||
| return errors.Wrap(err, "failed to create p4-comms healthcheck") | ||
| } | ||
| if err := h.h.AddCheck(&health.Config{ | ||
| Name: "p4-channel-conn", | ||
| Checker: &channelCheck{ | ||
| c: h.c, | ||
| host: h.cfg.ServerHost, | ||
| invSvc: h.invSvc, | ||
| connSvc: h.connSvc, | ||
| }, | ||
| Interval: time.Duration(10) * time.Second, | ||
| }); err != nil { | ||
| return errors.Wrap(err, "failed to create p4-channel-conn healthcheck") | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (h *healthCheck) channelCheck() error { | ||
| return nil | ||
| } | ||
|
|
||
| type commsCheck struct { | ||
| c *client.Client | ||
| host string | ||
| } | ||
|
|
||
| // Status of communication. | ||
| func (ch *commsCheck) Status() (interface{}, error) { | ||
| if err := ch.c.JoinChannel(ch.host, "health", nil, map[string]string{ | ||
| "internal": "true", | ||
| }); err != nil { | ||
| return nil, errors.Wrap(err, "failed to join p4 health channel") | ||
| } | ||
| if err := ch.c.Publish(sockets.Request{ | ||
| ChannelID: "health", | ||
| MessageKey: "my-p4", | ||
| Body: "ping", | ||
| }); err != nil { | ||
| return nil, errors.Wrap(err, "failed to ping p4") | ||
| } | ||
| ch.c.LeaveChannel("health", nil) | ||
| return nil, nil | ||
| } | ||
|
|
||
| type channelCheck struct { | ||
| c *client.Client | ||
| host string | ||
| invSvc payd.InvoiceService | ||
| connSvc payd.ConnectService | ||
| } | ||
|
|
||
| // Status of channels. | ||
| func (ch *channelCheck) Status() (interface{}, error) { | ||
| ctx, cancel := context.WithTimeout(context.Background(), time.Minute*2) | ||
| defer cancel() | ||
|
|
||
| invoices, err := ch.invSvc.InvoicesPending(context.Background()) | ||
| if err != nil { | ||
| if lathos.IsNotFound(err) { | ||
| return nil, nil | ||
| } | ||
| return nil, errors.Wrap(err, "failed to get invoices for channel check") | ||
| } | ||
| for _, invoice := range invoices { | ||
| if invoice.ExpiresAt.Time.UTC().Before(time.Now().UTC()) { | ||
| continue | ||
| } | ||
| if ch.c.HasChannel(invoice.ID) { | ||
| continue | ||
| } | ||
|
|
||
| if err := ch.connSvc.Connect(ctx, payd.ConnectArgs{ | ||
| InvoiceID: invoice.ID, | ||
| }); err != nil { | ||
| return nil, errors.Wrapf(err, "failed reconnecting to channel for invoice '%s'", invoice.ID) | ||
| } | ||
|
|
||
| } | ||
| return nil, nil | ||
| } |
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