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Merge pull request #2823 from benbjohnson/opentsdb
Convert OpenTSDB to service
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Original file line number | Diff line number | Diff line change |
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package opentsdb | ||
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import ( | ||
"bufio" | ||
"compress/gzip" | ||
"encoding/json" | ||
"errors" | ||
"io" | ||
"log" | ||
"net" | ||
"net/http" | ||
"time" | ||
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"github.com/influxdb/influxdb" | ||
"github.com/influxdb/influxdb/cluster" | ||
"github.com/influxdb/influxdb/tsdb" | ||
) | ||
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type Handler struct { | ||
Database string | ||
RetentionPolicy string | ||
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PointsWriter interface { | ||
WritePoints(p *cluster.WritePointsRequest) error | ||
} | ||
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Logger *log.Logger | ||
} | ||
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func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
switch r.URL.Path { | ||
case "/api/metadata/put": | ||
w.WriteHeader(http.StatusNoContent) | ||
case "/api/put": | ||
h.servePut(w, r) | ||
default: | ||
http.NotFound(w, r) | ||
} | ||
} | ||
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// ServeHTTP implements OpenTSDB's HTTP /api/put endpoint | ||
func (h *Handler) servePut(w http.ResponseWriter, r *http.Request) { | ||
defer r.Body.Close() | ||
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// Require POST method. | ||
if r.Method != "POST" { | ||
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed) | ||
return | ||
} | ||
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// Wrap reader if it's gzip encoded. | ||
var br *bufio.Reader | ||
if r.Header.Get("Content-Encoding") == "gzip" { | ||
zr, err := gzip.NewReader(r.Body) | ||
if err != nil { | ||
http.Error(w, "could not read gzip, "+err.Error(), http.StatusBadRequest) | ||
return | ||
} | ||
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br = bufio.NewReader(zr) | ||
} else { | ||
br = bufio.NewReader(r.Body) | ||
} | ||
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// Lookahead at the first byte. | ||
f, err := br.Peek(1) | ||
if err != nil || len(f) != 1 { | ||
http.Error(w, "peek error: "+err.Error(), http.StatusBadRequest) | ||
return | ||
} | ||
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// Peek to see if this is a JSON array. | ||
var multi bool | ||
switch f[0] { | ||
case '{': | ||
case '[': | ||
multi = true | ||
default: | ||
http.Error(w, "expected JSON array or hash", http.StatusBadRequest) | ||
return | ||
} | ||
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// Decode JSON data into slice of points. | ||
dps := make([]point, 1) | ||
if dec := json.NewDecoder(br); multi { | ||
if err = dec.Decode(&dps); err != nil { | ||
http.Error(w, "json array decode error", http.StatusBadRequest) | ||
return | ||
} | ||
} else { | ||
if err = dec.Decode(&dps[0]); err != nil { | ||
http.Error(w, "json object decode error", http.StatusBadRequest) | ||
return | ||
} | ||
} | ||
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// Convert points into TSDB points. | ||
points := make([]tsdb.Point, 0, len(dps)) | ||
for i := range dps { | ||
p := dps[i] | ||
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// Convert timestamp to Go time. | ||
// If time value is over a billion then it's microseconds. | ||
var ts time.Time | ||
if p.Time < 10000000000 { | ||
ts = time.Unix(p.Time, 0) | ||
} else { | ||
ts = time.Unix(p.Time/1000, (p.Time%1000)*1000) | ||
} | ||
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points = append(points, tsdb.NewPoint(p.Metric, p.Tags, map[string]interface{}{"value": p.Value}, ts)) | ||
} | ||
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// Write points. | ||
if err := h.PointsWriter.WritePoints(&cluster.WritePointsRequest{ | ||
Database: h.Database, | ||
RetentionPolicy: h.RetentionPolicy, | ||
ConsistencyLevel: cluster.ConsistencyLevelOne, | ||
Points: points, | ||
}); influxdb.IsClientError(err) { | ||
h.Logger.Println("write series error: ", err) | ||
http.Error(w, "write series error: "+err.Error(), http.StatusBadRequest) | ||
return | ||
} else if err != nil { | ||
h.Logger.Println("write series error: ", err) | ||
http.Error(w, "write series error: "+err.Error(), http.StatusInternalServerError) | ||
return | ||
} | ||
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w.WriteHeader(http.StatusNoContent) | ||
} | ||
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// chanListener represents a listener that receives connections through a channel. | ||
type chanListener struct { | ||
addr net.Addr | ||
ch chan net.Conn | ||
} | ||
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// newChanListener returns a new instance of chanListener. | ||
func newChanListener(addr net.Addr) *chanListener { | ||
return &chanListener{ | ||
addr: addr, | ||
ch: make(chan net.Conn), | ||
} | ||
} | ||
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func (ln *chanListener) Accept() (net.Conn, error) { | ||
conn, ok := <-ln.ch | ||
if !ok { | ||
return nil, errors.New("network connection closed") | ||
} | ||
log.Println("TSDB listener accept ", conn) | ||
return conn, nil | ||
} | ||
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// Close closes the connection channel. | ||
func (ln *chanListener) Close() error { | ||
close(ln.ch) | ||
return nil | ||
} | ||
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// Addr returns the network address of the listener. | ||
func (ln *chanListener) Addr() net.Addr { return ln.addr } | ||
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// readerConn represents a net.Conn with an assignable reader. | ||
type readerConn struct { | ||
net.Conn | ||
r io.Reader | ||
} | ||
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// Read implments the io.Reader interface. | ||
func (conn *readerConn) Read(b []byte) (n int, err error) { return conn.r.Read(b) } | ||
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// point represents an incoming JSON data point. | ||
type point struct { | ||
Metric string `json:"metric"` | ||
Time int64 `json:"timestamp"` | ||
Value float64 `json:"value"` | ||
Tags map[string]string `json:"tags,omitempty"` | ||
} |
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