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| 1 | +package angelus |
| 2 | + |
| 3 | +// The angelus.peers handler, and the federation half of figaro.list. |
| 4 | + |
| 5 | +import ( |
| 6 | + "context" |
| 7 | + "encoding/json" |
| 8 | + "fmt" |
| 9 | + |
| 10 | + "github.com/jack-work/figaro/api/rpc" |
| 11 | + "github.com/jack-work/figaro/sdk" |
| 12 | +) |
| 13 | + |
| 14 | +func (h *handlers) peersHandler(ctx context.Context, params json.RawMessage) (interface{}, error) { |
| 15 | + var req rpc.PeerRequest |
| 16 | + if len(params) > 0 { |
| 17 | + if err := json.Unmarshal(params, &req); err != nil { |
| 18 | + return nil, err |
| 19 | + } |
| 20 | + } |
| 21 | + p := h.angelus.Peers |
| 22 | + if p == nil { |
| 23 | + return nil, fmt.Errorf("this daemon has no peer registry") |
| 24 | + } |
| 25 | + |
| 26 | + switch { |
| 27 | + case req.Peer != nil: |
| 28 | + if req.Peer.Name == "" || req.Peer.URL == "" { |
| 29 | + return nil, fmt.Errorf("a peer needs a name and a url") |
| 30 | + } |
| 31 | + peer := Peer{Name: req.Peer.Name, URL: req.Peer.URL, TokenFile: req.Peer.TokenFile} |
| 32 | + // FAIL AT ADD TIME, not at the first listing. An endpoint that |
| 33 | + // cannot be built -- a bad scheme, an unreadable token file -- is a |
| 34 | + // mistake the operator is standing right there to fix, and finding |
| 35 | + // it later means finding it as a mysteriously absent machine. |
| 36 | + if _, err := peer.endpoint(); err != nil { |
| 37 | + return nil, err |
| 38 | + } |
| 39 | + if err := p.put(peer); err != nil { |
| 40 | + return nil, err |
| 41 | + } |
| 42 | + case req.Remove != "": |
| 43 | + ok, err := p.remove(req.Remove) |
| 44 | + if err != nil { |
| 45 | + return nil, err |
| 46 | + } |
| 47 | + if !ok { |
| 48 | + return nil, fmt.Errorf("no peer named %q", req.Remove) |
| 49 | + } |
| 50 | + } |
| 51 | + |
| 52 | + list := p.list() |
| 53 | + resp := rpc.PeerResponse{Peers: make([]rpc.PeerSpec, 0, len(list))} |
| 54 | + for _, peer := range list { |
| 55 | + resp.Peers = append(resp.Peers, rpc.PeerSpec{ |
| 56 | + Name: peer.Name, URL: peer.URL, TokenFile: peer.TokenFile, |
| 57 | + }) |
| 58 | + } |
| 59 | + resp.Reachable = h.probePeers(ctx, list) |
| 60 | + return resp, nil |
| 61 | +} |
| 62 | + |
| 63 | +// probePeers asks each peer who it is. It is part of `peer ls` rather than a |
| 64 | +// separate verb because "which of these can I actually reach" is the only |
| 65 | +// question anyone asks of a peer list, and answering it later costs a second |
| 66 | +// round trip and a second chance to be wrong. |
| 67 | +func (h *handlers) probePeers(ctx context.Context, list []Peer) map[string]string { |
| 68 | + if len(list) == 0 { |
| 69 | + return nil |
| 70 | + } |
| 71 | + out := make(map[string]string, len(list)) |
| 72 | + type res struct{ name, val string } |
| 73 | + ch := make(chan res, len(list)) |
| 74 | + for _, peer := range list { |
| 75 | + go func(peer Peer) { |
| 76 | + r := res{name: peer.Name} |
| 77 | + defer func() { ch <- r }() |
| 78 | + ep, err := peer.endpoint() |
| 79 | + if err != nil { |
| 80 | + r.val = "error: " + err.Error() |
| 81 | + return |
| 82 | + } |
| 83 | + pctx, cancel := context.WithTimeout(ctx, peerFanoutTimeout) |
| 84 | + defer cancel() |
| 85 | + cli, err := sdk.DialAngelus(ep) |
| 86 | + if err != nil { |
| 87 | + r.val = "unreachable: " + err.Error() |
| 88 | + return |
| 89 | + } |
| 90 | + defer cli.Close() |
| 91 | + st, err := cli.Status(pctx) |
| 92 | + if err != nil { |
| 93 | + r.val = "error: " + err.Error() |
| 94 | + return |
| 95 | + } |
| 96 | + r.val = "ok build=" + st.Build |
| 97 | + }(peer) |
| 98 | + } |
| 99 | + for range list { |
| 100 | + r := <-ch |
| 101 | + out[r.name] = r.val |
| 102 | + } |
| 103 | + return out |
| 104 | +} |
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