/
server.go
191 lines (159 loc) · 4.59 KB
/
server.go
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package main
import (
"context"
"encoding/json"
"io"
"net/http"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/go-plugins-helpers/sdk"
"github.com/pkg/errors"
"go.uber.org/zap"
)
type driver interface {
StartLogging(streamPath string, containerDetails *ContainerDetails) (*logStream, error)
ReadLogs(ctx context.Context, containerID string, config *ReadConfig) (io.ReadCloser, error)
StopLogging(streamPath string) error
}
type (
logDriverStartLoggingRequest struct {
File string `json:"File"`
Info ContainerDetails `json:"Info"`
}
logDriverReadLogsRequest struct {
Info struct {
ContainerID string `json:"ContainerID"`
} `json:"Info"`
Config ReadConfig `json:"Config"`
}
logDriverStopLoggingRequest struct {
File string `json:"File"`
}
response struct {
Cap *logger.Capability `json:"Cap,omitempty"`
Err string `json:"Err,omitempty"`
}
)
// Server is a server that handles requests from Docker.
type Server struct {
driver driver
sdkHandler sdk.Handler
zapLogger *zap.Logger
}
func NewServer(zapLogger *zap.Logger, sdkHandler sdk.Handler, driver driver) *Server {
srv := &Server{
driver: driver,
sdkHandler: sdkHandler,
zapLogger: zapLogger,
}
sdkHandler.HandleFunc("/LogDriver.StartLogging", srv.startLoggingHandler)
sdkHandler.HandleFunc("/LogDriver.StopLogging", srv.stopLoggingHandler)
sdkHandler.HandleFunc("/LogDriver.Capabilities", srv.capabilitiesHandler)
sdkHandler.HandleFunc("/LogDriver.ReadLogs", srv.readLogsHandler)
return srv
}
func (s *Server) Serve() error {
if err := s.sdkHandler.ServeUnix(driverName, 0); err != nil {
return errors.Wrap(err, "failed to serve unix socket")
}
return nil
}
func (s *Server) startLoggingHandler(w http.ResponseWriter, r *http.Request) {
var req logDriverStartLoggingRequest
err := json.NewDecoder(r.Body).Decode(&req)
if err != nil {
s.writeResponse(w, http.StatusBadRequest, err)
s.zapLogger.Error(
"failed to decode request",
zap.String("path", r.URL.Path),
zap.Error(err),
)
return
}
if _, err := s.driver.StartLogging(req.File, &req.Info); err != nil {
s.writeResponse(w, http.StatusInternalServerError, err)
s.zapLogger.Error(
"failed to start logging",
zap.String("container_name", req.Info.ContainerName),
zap.Error(err),
)
return
}
s.zapLogger.Debug("start logging request was called for the container", zap.Any("req", req))
s.writeResponse(w, http.StatusOK, nil)
}
func (s *Server) stopLoggingHandler(w http.ResponseWriter, r *http.Request) {
var req logDriverStopLoggingRequest
err := json.NewDecoder(r.Body).Decode(&req)
if err != nil {
s.writeResponse(w, http.StatusBadRequest, err)
s.zapLogger.Error(
"failed to decode request",
zap.String("path", r.URL.Path),
zap.Error(err),
)
return
}
if err := s.driver.StopLogging(req.File); err != nil {
s.writeResponse(w, http.StatusInternalServerError, err)
s.zapLogger.Error(
"failed to stop logging",
zap.String("streamPath", req.File),
zap.Error(err),
)
return
}
s.zapLogger.Debug("stop logging request was called for the container", zap.Any("req", req))
s.writeResponse(w, http.StatusOK, nil)
}
func (s *Server) capabilitiesHandler(w http.ResponseWriter, _ *http.Request) {
s.zapLogger.Debug("capabilities request was called")
_ = json.NewEncoder(w).Encode(response{
Cap: &logger.Capability{
ReadLogs: true,
},
})
}
func (s *Server) readLogsHandler(w http.ResponseWriter, r *http.Request) {
var req logDriverReadLogsRequest
err := json.NewDecoder(r.Body).Decode(&req)
if err != nil {
s.writeResponse(w, http.StatusBadRequest, err)
s.zapLogger.Error(
"failed to decode request",
zap.String("path", r.URL.Path),
zap.Error(err),
)
return
}
containerID := req.Info.ContainerID
lr, err := s.driver.ReadLogs(r.Context(), containerID, &req.Config)
if err != nil {
s.writeResponse(w, http.StatusInternalServerError, err)
s.zapLogger.Error(
"failed to read logs",
zap.String("container_id", containerID),
zap.Any("req", req),
zap.Error(err),
)
return
}
defer lr.Close()
s.zapLogger.Debug(
"read logs request was called for the container",
zap.String("container_id", containerID),
zap.Any("req", req),
)
w.Header().Set("Content-Type", "application/x-json-stream")
wf := ioutils.NewWriteFlusher(w)
_, _ = io.Copy(wf, lr)
}
func (s *Server) writeResponse(w http.ResponseWriter, status int, err error) {
resp := response{}
if err != nil {
resp.Err = err.Error()
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(status)
_ = json.NewEncoder(w).Encode(resp)
}