//
// Returns all collections in database
//
func (d *Resource) DatabaseCollectionsHandler(req *restful.Request, resp *restful.Response) {
// Mongo session
session, needclose, err := d.SessMng.Get(getParam("alias", req)) //先查服务器
if err != nil {
WriteError(err, resp)
return
}
if needclose {
defer session.Close()
}
// Database request parameter
dbname := getParam("database", req) //再拿到数据库信息
println(dbname)
// Get collections from database
collections, err := session.DB(dbname).CollectionNames() //拿到数据库下所有的集合
if err != nil {
WriteError(err, resp)
return
}
if collections == nil {
err = errors.New("Unknown database: " + dbname)
WriteError(err, resp)
return
}
// Write collections back to client
WriteResponse(collections, resp)
}
//
// Returns all databases in alias
//
func (d *Resource) AliasDatabasesHandler(req *restful.Request, resp *restful.Response) {
// filter invalids
alias := getParam("alias", req) //先拿到alias，也就是配置文件中的服务器信息
println(alias)
if alias == "" || strings.Index(alias, ".") != -1 {
resp.WriteHeader(http.StatusBadRequest)
return
}
// Mongo session
session, needclose, err := d.SessMng.Get(alias) //通过SessionManager拿到指定的alias所对应的session
if err != nil {
WriteError(err, resp)
return
}
if needclose {
defer session.Close()
}
// Get all databases in mongo
names, err := session.DatabaseNames() //查询当前服务器的所有Databases
if err != nil {
WriteError(err, resp)
return
}
// Write response back to client
WriteResponse(names, resp)
}
// GET http://localhost:8181/stats/local/landskape/systems
func (s *Resource) CollectionStatisticsHandler(req *restful.Request, resp *restful.Response) {
// Mongo session
session, needsClose, err := s.SessMng.Get(req.PathParameter("alias"))
if err != nil {
WriteError(err, resp)
return
}
if needsClose {
defer session.Close()
}
var (
// Request parameters
collection = req.PathParameter("collection")
database = req.PathParameter("database")
// Statistics result
result = bson.M{}
)
// Get statistics for collection
err = session.DB(database).Run(bson.M{"collStats": collection, "scale": 1}, &result)
if err != nil {
WriteError(err, resp)
return
}
// Write result to console
fmt.Printf("stats result:%#v", result)
// Write result back to client
WriteResponse(result, resp)
}
//
// Updates or inserts document(/s) in collection.
// Depending on request method
// POST - insert
// PUT - update
//
func (d *Resource) CollectionUpdateHandler(req *restful.Request, resp *restful.Response) {
// Read a document from request
document := bson.M{}
// Handle JSON parsing manually here, instead of relying on go-restful's
// req.ReadEntity. This is because ReadEntity currently parses JSON with
// UseNumber() which turns all numbers into strings. See:
// https://github.com/emicklei/mora/pull/31
decoder := json.NewDecoder(req.Request.Body)
err := decoder.Decode(&document) //将body赋值给document
if err != nil {
WriteStatusError(http.StatusBadRequest, err, resp)
return
}
document, err = mejson.Unmarshal(document)
if err != nil {
WriteStatusError(http.StatusBadRequest, err, resp)
return
}
// Mongo session
session, needclose, err := d.SessMng.Get(getParam("alias", req))
if err != nil {
WriteError(err, resp)
return
}
// Close session if it's needed
if needclose {
defer session.Close()
}
// Mongo Collection
col := d.GetMongoCollection(req, session)
// Compose a selector from request
selector, one, err := getSelector(req)
if err != nil {
WriteError(err, resp)
return
}
//isStrict := getParam("strict", req)
// Insert if request method is POST or no selector otherwise update
if req.Request.Method == "POST" { //如果是PUT请求，那么则新增
d.handleInsert(col, selector, document, req, resp)
return
}
//否则，就更新
d.handleUpdate(col, one, selector, document, req, resp)
}
//
// Removes document(/s) from collection
//
func (d *Resource) CollectionRemoveHandler(req *restful.Request, resp *restful.Response) {
// Mongo session
session, needclose, err := d.SessMng.Get(getParam("alias", req))
if err != nil {
WriteError(err, resp)
return
}
// Close session if it's needed
if needclose {
defer session.Close()
}
// Mongo Collection
col := d.GetMongoCollection(req, session)
// Compose a selector from request
// Get selector from `_id` path parameter and `query` query parameter
selector, one, err := getSelector(req)
if err != nil {
WriteError(err, resp)
return
}
// If no selector at all - drop entire collection
if len(selector) == 0 {
err = col.DropCollection()
if err != nil {
WriteError(err, resp)
return
}
WriteSuccess(resp)
return
}
// Remove one document if no query, otherwise remove all matching query
if one {
err = col.Remove(selector)
} else {
_, err = col.RemoveAll(selector)
}
if err != nil {
WriteError(err, resp)
return
}
// Write success response
WriteSuccess(resp)
}
//
// Finds document(/s) in collection
//
func (d *Resource) CollectionFindHandler(req *restful.Request, resp *restful.Response) {
// Mongo session
session, needclose, err := d.SessMng.Get(getParam("alias", req))
if err != nil {
WriteError(err, resp)
return
}
// Close session if it's needed
if needclose {
defer session.Close()
}
// Mongo Collection
col := d.GetMongoCollection(req, session)
// Compose a query from request
query, one, err := d.ComposeQuery(col, req)
if err != nil {
WriteStatusError(400, err, resp)
return
}
// If _id parameter is included in path
// queries only one document.
// Get documents from database
if one {
// Get one document
document := bson.M{}
err = query.One(&document)
if err != nil {
WriteError(err, resp)
return
}
var jsonDocument interface{}
if req.QueryParameter("extended_json") == "true" {
jsonDocument, err = mejson.Marshal(document)
if err != nil {
WriteError(err, resp)
return
}
} else {
jsonDocument = document
}
WriteResponse(jsonDocument, resp)
return
}
// Get all documents
documents := []bson.M{}
err = query.All(&documents)
if err != nil {
WriteError(err, resp)
return
}
var jsonDocuments interface{}
if req.QueryParameter("extended_json") == "true" {
jsonDocuments, err = mejson.Marshal(documents)
if err != nil {
WriteError(err, resp)
return
}
} else {
jsonDocuments = documents
}
res := struct {
Success bool `json:"success"`
Count interface{} `json:"count,omitempty"`
Prev string `json:"prev_url,omitempty"`
Next string `json:"next_url,omitempty"`
Data interface{} `json:"data"`
}{Success: true, Data: jsonDocuments}
// Get limit amount
limitnum := 10
if limit := req.QueryParameter("limit"); len(limit) > 0 {
limitnum, _ = strconv.Atoi(limit)
}
// If got full limit set next link
if len(documents) == limitnum {
res.Prev, res.Next = d.prevnexturl(req)
}
// Count documents if count parameter is included in query
if c, _ := strconv.ParseBool(req.QueryParameter("count")); c {
query.Skip(0)
query.Limit(0)
if n, err := query.Count(); err == nil {
res.Count = n
resp.AddHeader("X-Object-Count", strconv.Itoa(n))
}
}
// Write result back to client
resp.WriteEntity(res)
}