github.com/whtcorpsinc/milevadb-prod@v0.0.0-20211104133533-f57f4be3b597/allegrosql/server/statistics_handler.go (about)

     1  // Copyright 2020 WHTCORPS INC, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package server
    15  
    16  import (
    17  	"net/http"
    18  	"time"
    19  
    20  	"github.com/gorilla/mux"
    21  	"github.com/whtcorpsinc/BerolinaSQL/perceptron"
    22  	"github.com/whtcorpsinc/BerolinaSQL/allegrosql"
    23  	"github.com/whtcorpsinc/milevadb/petri"
    24  	"github.com/whtcorpsinc/milevadb/stochastik"
    25  	"github.com/whtcorpsinc/milevadb/stochastikctx/variable"
    26  	"github.com/whtcorpsinc/milevadb/types"
    27  	"github.com/whtcorpsinc/milevadb/soliton/gcutil"
    28  	"github.com/whtcorpsinc/milevadb/soliton/sqlexec"
    29  )
    30  
    31  // StatsHandler is the handler for dumping statistics.
    32  type StatsHandler struct {
    33  	do *petri.Petri
    34  }
    35  
    36  func (s *Server) newStatsHandler() *StatsHandler {
    37  	causetstore, ok := s.driver.(*MilevaDBDriver)
    38  	if !ok {
    39  		panic("Illegal driver")
    40  	}
    41  
    42  	do, err := stochastik.GetPetri(causetstore.causetstore)
    43  	if err != nil {
    44  		panic("Failed to get petri")
    45  	}
    46  	return &StatsHandler{do}
    47  }
    48  
    49  func (sh StatsHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
    50  	w.Header().Set("Content-Type", "application/json")
    51  
    52  	params := mux.Vars(req)
    53  
    54  	is := sh.do.SchemaReplicant()
    55  	h := sh.do.StatsHandle()
    56  	tbl, err := is.BlockByName(perceptron.NewCIStr(params[FIDelBName]), perceptron.NewCIStr(params[pBlockName]))
    57  	if err != nil {
    58  		writeError(w, err)
    59  	} else {
    60  		js, err := h.DumpStatsToJSON(params[FIDelBName], tbl.Meta(), nil)
    61  		if err != nil {
    62  			writeError(w, err)
    63  		} else {
    64  			writeData(w, js)
    65  		}
    66  	}
    67  }
    68  
    69  // StatsHistoryHandler is the handler for dumping statistics.
    70  type StatsHistoryHandler struct {
    71  	do *petri.Petri
    72  }
    73  
    74  func (s *Server) newStatsHistoryHandler() *StatsHistoryHandler {
    75  	causetstore, ok := s.driver.(*MilevaDBDriver)
    76  	if !ok {
    77  		panic("Illegal driver")
    78  	}
    79  
    80  	do, err := stochastik.GetPetri(causetstore.causetstore)
    81  	if err != nil {
    82  		panic("Failed to get petri")
    83  	}
    84  	return &StatsHistoryHandler{do}
    85  }
    86  
    87  func (sh StatsHistoryHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
    88  	w.Header().Set("Content-Type", "application/json")
    89  
    90  	params := mux.Vars(req)
    91  	se, err := stochastik.CreateStochastik(sh.do.CausetStore())
    92  	if err != nil {
    93  		writeError(w, err)
    94  		return
    95  	}
    96  	se.GetStochastikVars().StmtCtx.TimeZone = time.Local
    97  	t, err := types.ParseTime(se.GetStochastikVars().StmtCtx, params[pSnapshot], allegrosql.TypeTimestamp, 6)
    98  	if err != nil {
    99  		writeError(w, err)
   100  		return
   101  	}
   102  	t1, err := t.GoTime(time.Local)
   103  	if err != nil {
   104  		writeError(w, err)
   105  		return
   106  	}
   107  	snapshot := variable.GoTimeToTS(t1)
   108  	err = gcutil.ValidateSnapshot(se, snapshot)
   109  	if err != nil {
   110  		writeError(w, err)
   111  		return
   112  	}
   113  
   114  	is, err := sh.do.GetSnapshotSchemaReplicant(snapshot)
   115  	if err != nil {
   116  		writeError(w, err)
   117  		return
   118  	}
   119  	h := sh.do.StatsHandle()
   120  	tbl, err := is.BlockByName(perceptron.NewCIStr(params[FIDelBName]), perceptron.NewCIStr(params[pBlockName]))
   121  	if err != nil {
   122  		writeError(w, err)
   123  		return
   124  	}
   125  	se.GetStochastikVars().SnapshotschemaReplicant, se.GetStochastikVars().SnapshotTS = is, snapshot
   126  	historyStatsInterDirc := se.(sqlexec.RestrictedALLEGROSQLInterlockingDirectorate)
   127  	js, err := h.DumpStatsToJSON(params[FIDelBName], tbl.Meta(), historyStatsInterDirc)
   128  	if err != nil {
   129  		writeError(w, err)
   130  	} else {
   131  		writeData(w, js)
   132  	}
   133  }