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context.go
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context.go
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package server
import (
"fmt"
"github.com/Sirupsen/logrus"
"github.com/gocraft/web"
"gopkg.in/pfnet/jasco.v1"
"gopkg.in/sensorbee/sensorbee.v0/bql"
"gopkg.in/sensorbee/sensorbee.v0/bql/parser"
"gopkg.in/sensorbee/sensorbee.v0/bql/udf"
"gopkg.in/sensorbee/sensorbee.v0/core"
"gopkg.in/sensorbee/sensorbee.v0/data"
"gopkg.in/sensorbee/sensorbee.v0/server/config"
"gopkg.in/sensorbee/sensorbee.v0/server/udsstorage"
"io"
"io/ioutil"
)
// Context is a context object for gocraft/web.
type Context struct {
*jasco.Context
udsStorage udf.UDSStorage
topologies TopologyRegistry
config *config.Config
// logger is used by core.Context, not for the server's Context. This logger
// can be shared with jasco.Context.
logger *logrus.Logger
}
// SetTopologyRegistry sets the registry of topologies to this context. This
// method must be called in the middleware of Context.
func (c *Context) SetTopologyRegistry(r TopologyRegistry) {
c.topologies = r
}
// ContextGlobalVariables has fields which are shared through all contexts
// allocated for each request.
type ContextGlobalVariables struct {
// Logger is used to write log messages.
Logger *logrus.Logger
// LogDestination is a writer to which logs are written.
LogDestination io.WriteCloser
// Topologies is a registry which manages topologies to support multi
// tenancy.
Topologies TopologyRegistry
// Config has configuration parameters.
Config *config.Config
}
// SetUpContextGlobalVariables create a new ContextGlobalVariables from a config.
// DO NOT make any change on the config after calling this function. The caller
// can change other members of ContextGlobalVariables.
//
// The caller must Close LogDestination.
func SetUpContextGlobalVariables(conf *config.Config) (*ContextGlobalVariables, error) {
logger := logrus.New()
w, err := conf.Logging.CreateWriter()
if err != nil {
return nil, err
}
closeWriter := true
defer func() {
if closeWriter {
w.Close()
}
}()
logger.Out = w
closeWriter = false
return &ContextGlobalVariables{
Logger: logger,
LogDestination: w,
Topologies: NewDefaultTopologyRegistry(),
Config: conf,
}, nil
}
// SetUpContextAndRouter creates a router of the API server and its context.
// jascoRoot is a root router returned from jasco.New.
//
// This function returns a new web.Router. Don't use the router returned from
// this function as a handler of HTTP server, but use jascoRoot instead.
func SetUpContextAndRouter(prefix string, jascoRoot *web.Router, gvariables *ContextGlobalVariables) (*web.Router, error) {
gvars := *gvariables
udsStorage, err := setUpUDSStorage(&gvars.Config.Storage.UDS)
if err != nil {
return nil, err
}
// Topologies should be created after setting up everything necessary for it.
if err := setUpTopologies(gvars.Logger, gvars.Topologies, gvars.Config, udsStorage); err != nil {
return nil, err
}
router := jascoRoot.Subrouter(Context{}, "/")
router.Middleware(func(c *Context, rw web.ResponseWriter, req *web.Request, next web.NextMiddlewareFunc) {
c.logger = gvars.Logger
c.udsStorage = udsStorage
c.topologies = gvars.Topologies
c.config = gvars.Config
next(rw, req)
})
return router, nil
}
func setUpUDSStorage(conf *config.UDSStorage) (udf.UDSStorage, error) {
// Parameters are already validated in conf
switch conf.Type {
case "in_memory":
return udf.NewInMemoryUDSStorage(), nil
case "fs":
dir, _ := data.AsString(conf.Params["dir"])
var tempDir string
if v, ok := conf.Params["temp_dir"]; ok {
tempDir, _ = data.AsString(v)
}
return udsstorage.NewFS(dir, tempDir)
default:
return nil, fmt.Errorf("unsupported uds storage type: %v", conf.Type)
}
}
func setUpTopologies(logger *logrus.Logger, r TopologyRegistry, conf *config.Config, us udf.UDSStorage) error {
stopAll := true
defer func() {
if stopAll {
ts, err := r.List()
if err != nil {
logger.WithField("err", err).Error("Cannot list topologies for clean up")
return
}
for name, t := range ts {
if err := t.Topology().Stop(); err != nil {
logger.WithFields(logrus.Fields{
"err": err,
"topology": name,
}).Error("Cannot stop the topology")
}
}
}
}()
for name := range conf.Topologies {
logger.WithField("topology", name).Info("Setting up the topology")
tb, err := setUpTopology(logger, name, conf, us)
if err != nil {
return err
}
if err := r.Register(name, tb); err != nil {
logger.WithFields(logrus.Fields{
"err": err,
"topology": name,
}).Error("Cannot register the topology")
return err
}
}
stopAll = false
return nil
}
func setUpTopology(logger *logrus.Logger, name string, conf *config.Config, us udf.UDSStorage) (*bql.TopologyBuilder, error) {
cc := &core.ContextConfig{
Logger: logger,
}
cc.Flags.DroppedTupleLog.Set(conf.Logging.LogDroppedTuples)
cc.Flags.DroppedTupleSummarization.Set(conf.Logging.SummarizeDroppedTuples)
tp, err := core.NewDefaultTopology(core.NewContext(cc), name)
if err != nil {
return nil, err
}
tb, err := bql.NewTopologyBuilder(tp)
if err != nil {
logger.WithFields(logrus.Fields{
"err": err,
"topology": name,
}).Error("Cannot create a topology builder")
return nil, err
}
tb.UDSStorage = us
bqlFilePath := conf.Topologies[name].BQLFile
if bqlFilePath == "" {
return tb, nil
}
shouldStop := true
defer func() {
if shouldStop {
if err := tp.Stop(); err != nil {
logger.WithFields(logrus.Fields{
"err": err,
"topology": name,
}).Error("Cannot stop the topology")
}
}
}()
queries, err := ioutil.ReadFile(bqlFilePath)
if err != nil {
logger.WithFields(logrus.Fields{
"err": err,
"topology": name,
// TODO: add stmt.String()
}).Error("Cannot add a statement to the topology")
return nil, err
}
// TODO: improve error handling
bp := parser.New()
stmts, err := bp.ParseStmts(string(queries))
if err != nil {
return nil, err
}
for _, stmt := range stmts {
if _, err := tb.AddStmt(stmt); err != nil {
logger.WithFields(logrus.Fields{
"err": err,
"topology": name,
// TODO: add stmt.String()
}).Error("Cannot add a statement to the topology")
return nil, err
}
}
shouldStop = false
return tb, nil
}