steve
ddc07609cb
P2R-13a. restic.Env gains LimitUploadKBps/LimitDownloadKBps which are
emitted as global --limit-upload/--limit-download flags before the
subcommand on every invocation. Agent dispatcher tracks host-wide
caps received via config.update; server pushes them on hello and
after PUT /api/hosts/{id}/bandwidth.
Also extends api.CommandRunPayload with optional per-job overrides
(BandwidthUpKBps/Down + PreHook/PostHook); the override consumers
land in T2/T6.
79 lines
2.8 KiB
Go
79 lines
2.8 KiB
Go
// host_bandwidth_push.go — server → agent fan-out of host-wide
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// bandwidth caps via config.update.
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//
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// Two entry points: pushBandwidthOnHello (called from onAgentHello,
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// always pushes the current state so the agent picks up edits made
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// while it was offline) and pushBandwidthToAgent (called after the
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// PUT bandwidth handler succeeds, so an online agent re-arms within
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// seconds).
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//
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// We always send pointer fields (zero-valued when uncapped) so the
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// agent can distinguish "no change" (nil → field absent on the wire)
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// from "explicitly cleared" (non-nil zero pointer). See
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// api.ConfigUpdatePayload doc for the wire semantics.
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package http
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import (
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"context"
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"log/slog"
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"time"
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"gitea.dcglab.co.uk/steve/restic-manager/internal/api"
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"gitea.dcglab.co.uk/steve/restic-manager/internal/server/ws"
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)
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// pushBandwidthOnHello ships the host's current bandwidth caps as a
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// config.update on the supplied conn. Silent no-op on lookup error.
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func (s *Server) pushBandwidthOnHello(ctx context.Context, hostID string, conn *ws.Conn) {
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host, err := s.deps.Store.GetHost(ctx, hostID)
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if err != nil {
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slog.Warn("on-hello: load host for bandwidth", "host_id", hostID, "err", err)
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return
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}
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payload := bandwidthPayload(host.BandwidthUpKBps, host.BandwidthDownKBps)
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env, err := api.Marshal(api.MsgConfigUpdate, "", payload)
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if err != nil {
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slog.Error("on-hello: marshal bandwidth config.update", "host_id", hostID, "err", err)
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return
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}
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sendCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
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defer cancel()
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if err := conn.Send(sendCtx, env); err != nil {
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slog.Warn("on-hello: send bandwidth config.update", "host_id", hostID, "err", err)
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}
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}
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// pushBandwidthToAgent ships the supplied caps via the hub. Caller is
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// expected to check Hub.Connected first when it matters.
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func (s *Server) pushBandwidthToAgent(ctx context.Context, hostID string, up, down *int) error {
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env, err := api.Marshal(api.MsgConfigUpdate, "", bandwidthPayload(up, down))
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if err != nil {
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return err
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}
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sendCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
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defer cancel()
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return s.deps.Hub.Send(sendCtx, hostID, env)
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}
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// bandwidthPayload builds a ConfigUpdatePayload with only the
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// bandwidth fields populated. Pointers are passed through verbatim;
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// callers wanting to clear a cap should pass a non-nil pointer to 0.
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// On the on-hello path we materialize zero-valued pointers when the
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// host record has no cap set, so the agent's stored state is always
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// in sync (rather than retaining whatever value it last received).
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func bandwidthPayload(up, down *int) api.ConfigUpdatePayload {
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zero := 0
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upPtr := up
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if upPtr == nil {
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upPtr = &zero
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}
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downPtr := down
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if downPtr == nil {
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downPtr = &zero
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}
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return api.ConfigUpdatePayload{
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BandwidthUpKBps: upPtr,
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BandwidthDownKBps: downPtr,
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}
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}
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