cloudflare/pint
Publicmirrored from https://github.com/cloudflare/pintAvailable
internal/promapi/buildinfo.go
128lines · modecode
| 1 | package promapi |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "encoding/json" |
| 6 | "fmt" |
| 7 | "io" |
| 8 | "log/slog" |
| 9 | "net/http" |
| 10 | "net/url" |
| 11 | "time" |
| 12 | |
| 13 | v1 "github.com/prometheus/client_golang/api/prometheus/v1" |
| 14 | ) |
| 15 | |
| 16 | const ( |
| 17 | APIPathBuildInfo = "/api/v1/status/buildinfo" |
| 18 | ) |
| 19 | |
| 20 | type PrometheusBuildInfoResponse struct { |
| 21 | Data v1.BuildinfoResult `json:"data"` |
| 22 | PrometheusResponse |
| 23 | } |
| 24 | |
| 25 | type BuildInfoResult struct { |
| 26 | URI string |
| 27 | Version string |
| 28 | } |
| 29 | |
| 30 | type buildInfoQuery struct { |
| 31 | prom *Prometheus |
| 32 | ctx context.Context |
| 33 | timestamp time.Time |
| 34 | } |
| 35 | |
| 36 | func (q buildInfoQuery) Run() queryResult { |
| 37 | slog.LogAttrs(q.ctx, slog.LevelDebug, "Getting prometheus build info", slog.String("uri", q.prom.safeURI)) |
| 38 | |
| 39 | ctx, cancel := q.prom.requestContext(q.ctx) |
| 40 | defer cancel() |
| 41 | |
| 42 | var qr queryResult |
| 43 | |
| 44 | args := url.Values{} |
| 45 | resp, err := q.prom.doRequest(ctx, http.MethodGet, q.Endpoint(), args) |
| 46 | if err != nil { |
| 47 | qr.err = fmt.Errorf("failed to query Prometheus build info: %w", err) |
| 48 | return qr |
| 49 | } |
| 50 | defer resp.Body.Close() |
| 51 | |
| 52 | if resp.StatusCode/100 != 2 { |
| 53 | qr.err = tryDecodingAPIError(resp) |
| 54 | return qr |
| 55 | } |
| 56 | |
| 57 | bi, err := parseBuildInfo(resp.Body) |
| 58 | qr.value, qr.err = bi, err |
| 59 | return qr |
| 60 | } |
| 61 | |
| 62 | func (q buildInfoQuery) Endpoint() string { |
| 63 | return APIPathBuildInfo |
| 64 | } |
| 65 | |
| 66 | func (q buildInfoQuery) String() string { |
| 67 | return APIPathBuildInfo |
| 68 | } |
| 69 | |
| 70 | func (q buildInfoQuery) CacheKey() uint64 { |
| 71 | return hash(q.prom.unsafeURI, q.Endpoint()) |
| 72 | } |
| 73 | |
| 74 | func (q buildInfoQuery) CacheTTL() time.Duration { |
| 75 | return time.Minute * 10 |
| 76 | } |
| 77 | |
| 78 | func (prom *Prometheus) BuildInfo(ctx context.Context) (*BuildInfoResult, error) { |
| 79 | slog.LogAttrs(ctx, slog.LevelDebug, "Scheduling Prometheus build info query", slog.String("uri", prom.safeURI)) |
| 80 | |
| 81 | prom.locker.lock(APIPathBuildInfo) |
| 82 | defer prom.locker.unlock(APIPathBuildInfo) |
| 83 | |
| 84 | resultChan := make(chan queryResult) |
| 85 | prom.queries <- queryRequest{ |
| 86 | query: buildInfoQuery{prom: prom, ctx: ctx, timestamp: time.Now()}, |
| 87 | result: resultChan, |
| 88 | } |
| 89 | |
| 90 | result := <-resultChan |
| 91 | if result.err != nil { |
| 92 | return nil, QueryError{err: result.err, msg: decodeError(result.err)} |
| 93 | } |
| 94 | |
| 95 | bi := result.value.(v1.BuildinfoResult) |
| 96 | r := BuildInfoResult{ |
| 97 | URI: prom.publicURI, |
| 98 | Version: bi.Version, |
| 99 | } |
| 100 | |
| 101 | return &r, nil |
| 102 | } |
| 103 | |
| 104 | func parseBuildInfo(r io.Reader) (_ v1.BuildinfoResult, err error) { |
| 105 | defer dummyReadAll(r) |
| 106 | |
| 107 | var data PrometheusBuildInfoResponse |
| 108 | if err = json.NewDecoder(r).Decode(&data); err != nil { |
| 109 | return data.Data, APIError{ |
| 110 | Status: data.Status, |
| 111 | ErrorType: v1.ErrBadResponse, |
| 112 | Err: "JSON parse error: " + err.Error(), |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | if data.Status != "success" { |
| 117 | if data.Error == "" { |
| 118 | data.Error = "empty response object" |
| 119 | } |
| 120 | return data.Data, APIError{ |
| 121 | Status: data.Status, |
| 122 | ErrorType: decodeErrorType(data.ErrorType), |
| 123 | Err: data.Error, |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | return data.Data, nil |
| 128 | } |
| 129 | |