vtgate

package
Version: v2.1.0-alpha.1+incompa... Latest Latest
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Published: Nov 8, 2016 License: BSD-3-Clause Imports: 47 Imported by: 0

Documentation

Overview

Package vtgate provides query routing rpc services for vttablets.

Package vtgate provides query routing rpc services for vttablets.

Index

Constants

View Source
const (

	// TopoTemplate is the HTML to use to display the
	// ResilientSrvTopoServerCacheStatus object
	TopoTemplate = `` /* 1064-byte string literal not displayed */

)
View Source
const (
	// VSchemaTemplate is the HTML template to display VSchemaStats.
	VSchemaTemplate = `` /* 671-byte string literal not displayed */

)

Variables

View Source
var RegisterVTGates []RegisterVTGate

RegisterVTGates stores register funcs for VTGate server.

Functions

func StrsEquals

func StrsEquals(a, b []string) bool

StrsEquals compares contents of two string slices.

Types

type Planner

type Planner struct {
	// contains filtered or unexported fields
}

Planner is used to compute the plan. It contains the vschema, and has a cache of previous computed plans.

func NewPlanner

func NewPlanner(ctx context.Context, serv topo.SrvTopoServer, cell string, cacheSize int) *Planner

NewPlanner creates a new planner for VTGate. It will watch the vschema in the topology until the ctx is closed.

func (*Planner) GetPlan

func (plr *Planner) GetPlan(sql, keyspace string) (*engine.Plan, error)

GetPlan computes the plan for the given query. If one is in the cache, it reuses it.

func (*Planner) ServeHTTP

func (plr *Planner) ServeHTTP(response http.ResponseWriter, request *http.Request)

ServeHTTP shows the current plans in the query cache.

func (*Planner) VSchema

func (plr *Planner) VSchema() *vindexes.VSchema

VSchema returns the VSchema.

func (*Planner) VSchemaStats

func (plr *Planner) VSchemaStats() *VSchemaStats

VSchemaStats returns the loaded vschema stats.

func (*Planner) WatchSrvVSchema

func (plr *Planner) WatchSrvVSchema(ctx context.Context, cell string)

WatchSrvVSchema watches the SrvVSchema from the topo. The function does not return an error. It instead logs warnings on failure. The SrvVSchema object is roll-up of all the Keyspace information, so when a keyspace is added or removed, it will be properly updated.

This function will wait until the first value has either been processed or triggered an error before returning.

type RegisterVTGate

type RegisterVTGate func(vtgateservice.VTGateService)

RegisterVTGate defines the type of registration mechanism.

type ResilientSrvTopoServer

type ResilientSrvTopoServer struct {
	// contains filtered or unexported fields
}

ResilientSrvTopoServer is an implementation of SrvTopoServer based on a topo.Server that uses a cache for two purposes: - limit the QPS to the underlying topo.Server - return the last known value of the data if there is an error

func NewResilientSrvTopoServer

func NewResilientSrvTopoServer(base topo.Server, counterPrefix string) *ResilientSrvTopoServer

NewResilientSrvTopoServer creates a new ResilientSrvTopoServer based on the provided topo.Server.

func (*ResilientSrvTopoServer) CacheStatus

CacheStatus returns a displayable version of the cache

func (*ResilientSrvTopoServer) GetSrvKeyspace

func (server *ResilientSrvTopoServer) GetSrvKeyspace(ctx context.Context, cell, keyspace string) (*topodatapb.SrvKeyspace, error)

GetSrvKeyspace returns SrvKeyspace object for the given cell and keyspace.

func (*ResilientSrvTopoServer) GetSrvKeyspaceNames

func (server *ResilientSrvTopoServer) GetSrvKeyspaceNames(ctx context.Context, cell string) ([]string, error)

GetSrvKeyspaceNames returns all keyspace names for the given cell.

func (*ResilientSrvTopoServer) WatchSrvVSchema

WatchSrvVSchema is part of the SrvTopoServer API

type ResilientSrvTopoServerCacheStatus

type ResilientSrvTopoServerCacheStatus struct {
	SrvKeyspaceNames SrvKeyspaceNamesCacheStatusList
	SrvKeyspaces     SrvKeyspaceCacheStatusList
}

ResilientSrvTopoServerCacheStatus has the full status of the cache

type Resolver

type Resolver struct {
	// contains filtered or unexported fields
}

Resolver is the layer to resolve KeyspaceIds and KeyRanges to shards. It will try to re-resolve shards if ScatterConn returns retryable error, which may imply horizontal or vertical resharding happened.

func NewResolver

func NewResolver(serv topo.SrvTopoServer, cell string, sc *ScatterConn) *Resolver

NewResolver creates a new Resolver.

func (*Resolver) Execute

func (res *Resolver) Execute(
	ctx context.Context,
	sql string,
	bindVars map[string]interface{},
	keyspace string,
	tabletType topodatapb.TabletType,
	session *vtgatepb.Session,
	mapToShards func(string) (string, []string, error),
	notInTransaction bool,
	options *querypb.ExecuteOptions,
) (*sqltypes.Result, error)

Execute executes a non-streaming query based on shards resolved by given func. It retries query if new keyspace/shards are re-resolved after a retryable error.

func (*Resolver) ExecuteBatch

func (res *Resolver) ExecuteBatch(
	ctx context.Context,
	tabletType topodatapb.TabletType,
	asTransaction bool,
	session *vtgatepb.Session,
	options *querypb.ExecuteOptions,
	buildBatchRequest func() (*scatterBatchRequest, error),
) ([]sqltypes.Result, error)

ExecuteBatch executes a group of queries based on shards resolved by given func. It retries query if new keyspace/shards are re-resolved after a retryable error.

func (*Resolver) ExecuteBatchKeyspaceIds

func (res *Resolver) ExecuteBatchKeyspaceIds(ctx context.Context, queries []*vtgatepb.BoundKeyspaceIdQuery, tabletType topodatapb.TabletType, asTransaction bool, session *vtgatepb.Session, options *querypb.ExecuteOptions) ([]sqltypes.Result, error)

ExecuteBatchKeyspaceIds executes a group of queries based on KeyspaceIds. It retries query if new keyspace/shards are re-resolved after a retryable error.

func (*Resolver) ExecuteEntityIds

func (res *Resolver) ExecuteEntityIds(
	ctx context.Context,
	sql string,
	bindVariables map[string]interface{},
	keyspace string,
	entityColumnName string,
	entityKeyspaceIDs []*vtgatepb.ExecuteEntityIdsRequest_EntityId,
	tabletType topodatapb.TabletType,
	session *vtgatepb.Session,
	notInTransaction bool,
	options *querypb.ExecuteOptions,
) (*sqltypes.Result, error)

ExecuteEntityIds executes a non-streaming query based on given KeyspaceId map. It retries query if new keyspace/shards are re-resolved after a retryable error.

func (*Resolver) ExecuteKeyRanges

func (res *Resolver) ExecuteKeyRanges(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyRanges []*topodatapb.KeyRange, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool, options *querypb.ExecuteOptions) (*sqltypes.Result, error)

ExecuteKeyRanges executes a non-streaming query based on KeyRanges. It retries query if new keyspace/shards are re-resolved after a retryable error.

func (*Resolver) ExecuteKeyspaceIds

func (res *Resolver) ExecuteKeyspaceIds(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyspaceIds [][]byte, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool, options *querypb.ExecuteOptions) (*sqltypes.Result, error)

ExecuteKeyspaceIds executes a non-streaming query based on KeyspaceIds. It retries query if new keyspace/shards are re-resolved after a retryable error. This throws an error if a dml spans multiple keyspace_ids. Resharding depends on being able to uniquely route a write.

func (*Resolver) GetGatewayCacheStatus

func (res *Resolver) GetGatewayCacheStatus() gateway.TabletCacheStatusList

GetGatewayCacheStatus returns a displayable version of the Gateway cache.

func (*Resolver) StreamExecuteKeyRanges

func (res *Resolver) StreamExecuteKeyRanges(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyRanges []*topodatapb.KeyRange, tabletType topodatapb.TabletType, options *querypb.ExecuteOptions, sendReply func(*sqltypes.Result) error) error

StreamExecuteKeyRanges executes a streaming query on the specified KeyRanges. The KeyRanges are resolved to shards using the serving graph. This function currently temporarily enforces the restriction of executing on one shard since it cannot merge-sort the results to guarantee ordering of response which is needed for checkpointing. The api supports supplying multiple keyranges to make it future proof.

func (*Resolver) StreamExecuteKeyspaceIds

func (res *Resolver) StreamExecuteKeyspaceIds(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyspaceIds [][]byte, tabletType topodatapb.TabletType, options *querypb.ExecuteOptions, sendReply func(*sqltypes.Result) error) error

StreamExecuteKeyspaceIds executes a streaming query on the specified KeyspaceIds. The KeyspaceIds are resolved to shards using the serving graph. This function currently temporarily enforces the restriction of executing on one shard since it cannot merge-sort the results to guarantee ordering of response which is needed for checkpointing. The api supports supplying multiple KeyspaceIds to make it future proof.

func (*Resolver) UpdateStream

func (res *Resolver) UpdateStream(ctx context.Context, keyspace string, shard string, keyRange *topodatapb.KeyRange, tabletType topodatapb.TabletType, timestamp int64, event *querypb.EventToken, sendReply func(*querypb.StreamEvent, int64) error) error

UpdateStream streams the events. TODO(alainjobart): Implement the multi-shards merge code.

type Router

type Router struct {
	// contains filtered or unexported fields
}

Router is the layer to route queries to the correct shards based on the values in the query.

func NewRouter

func NewRouter(ctx context.Context, serv topo.SrvTopoServer, cell, statsName string, scatterConn *ScatterConn) *Router

NewRouter creates a new Router.

func (*Router) Execute

func (rtr *Router) Execute(ctx context.Context, sql string, bindVars map[string]interface{}, keyspace string, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool, options *querypb.ExecuteOptions) (*sqltypes.Result, error)

Execute routes a non-streaming query.

func (*Router) ExecuteRoute

func (rtr *Router) ExecuteRoute(vcursor *requestContext, route *engine.Route, joinvars map[string]interface{}) (*sqltypes.Result, error)

ExecuteRoute executes the route query for all route opcodes.

func (*Router) GetRouteFields

func (rtr *Router) GetRouteFields(vcursor *requestContext, route *engine.Route, joinvars map[string]interface{}) (*sqltypes.Result, error)

GetRouteFields fetches the field info for the route.

func (*Router) IsKeyspaceRangeBasedSharded

func (rtr *Router) IsKeyspaceRangeBasedSharded(keyspace string) bool

IsKeyspaceRangeBasedSharded returns true if the keyspace in the vschema is marked as sharded.

func (*Router) StreamExecute

func (rtr *Router) StreamExecute(ctx context.Context, sql string, bindVars map[string]interface{}, keyspace string, tabletType topodatapb.TabletType, options *querypb.ExecuteOptions, sendReply func(*sqltypes.Result) error) error

StreamExecute executes a streaming query.

func (*Router) StreamExecuteRoute

func (rtr *Router) StreamExecuteRoute(vcursor *requestContext, route *engine.Route, joinvars map[string]interface{}, sendReply func(*sqltypes.Result) error) error

StreamExecuteRoute performs a streaming route. Only selects are allowed.

type SafeSession

type SafeSession struct {
	*vtgatepb.Session
	// contains filtered or unexported fields
}

SafeSession is a mutex-protected version of the Session. It is thread-safe if each thread only accesses one shard. (the use pattern is 'Find', if not found, then 'Append', for a single shard)

func NewSafeSession

func NewSafeSession(sessn *vtgatepb.Session) *SafeSession

NewSafeSession returns a new SafeSession based on the Session

func (*SafeSession) Append

func (session *SafeSession) Append(shardSession *vtgatepb.Session_ShardSession)

Append adds a new ShardSession

func (*SafeSession) Find

func (session *SafeSession) Find(keyspace, shard string, tabletType topodatapb.TabletType) int64

Find returns the transactionId, if any, for a session

func (*SafeSession) InTransaction

func (session *SafeSession) InTransaction() bool

InTransaction returns true if we are in a transaction

func (*SafeSession) Reset

func (session *SafeSession) Reset()

Reset clears the session

type ScatterConn

type ScatterConn struct {
	// contains filtered or unexported fields
}

ScatterConn is used for executing queries across multiple shard level connections.

func NewScatterConn

func NewScatterConn(statsName string, txConn *TxConn, gw gateway.Gateway) *ScatterConn

NewScatterConn creates a new ScatterConn.

func (*ScatterConn) Close

func (stc *ScatterConn) Close() error

Close closes the underlying Gateway.

func (*ScatterConn) Execute

func (stc *ScatterConn) Execute(
	ctx context.Context,
	query string,
	bindVars map[string]interface{},
	keyspace string,
	shards []string,
	tabletType topodatapb.TabletType,
	session *SafeSession,
	notInTransaction bool,
	options *querypb.ExecuteOptions,
) (*sqltypes.Result, error)

Execute executes a non-streaming query on the specified shards.

func (*ScatterConn) ExecuteBatch

func (stc *ScatterConn) ExecuteBatch(
	ctx context.Context,
	batchRequest *scatterBatchRequest,
	tabletType topodatapb.TabletType,
	asTransaction bool,
	session *SafeSession,
	options *querypb.ExecuteOptions) (qrs []sqltypes.Result, err error)

ExecuteBatch executes a batch of non-streaming queries on the specified shards.

func (*ScatterConn) ExecuteEntityIds

func (stc *ScatterConn) ExecuteEntityIds(
	ctx context.Context,
	shards []string,
	sqls map[string]string,
	bindVars map[string]map[string]interface{},
	keyspace string,
	tabletType topodatapb.TabletType,
	session *SafeSession,
	notInTransaction bool,
	options *querypb.ExecuteOptions,
) (*sqltypes.Result, error)

ExecuteEntityIds executes queries that are shard specific.

func (*ScatterConn) ExecuteMulti

func (stc *ScatterConn) ExecuteMulti(
	ctx context.Context,
	query string,
	keyspace string,
	shardVars map[string]map[string]interface{},
	tabletType topodatapb.TabletType,
	session *SafeSession,
	notInTransaction bool,
	options *querypb.ExecuteOptions,
) (*sqltypes.Result, error)

ExecuteMulti is like Execute, but each shard gets its own bindVars. If len(shards) is not equal to len(bindVars), the function panics.

func (*ScatterConn) GetGatewayCacheStatus

func (stc *ScatterConn) GetGatewayCacheStatus() gateway.TabletCacheStatusList

GetGatewayCacheStatus returns a displayable version of the Gateway cache.

func (*ScatterConn) SplitQuery

func (stc *ScatterConn) SplitQuery(
	ctx context.Context,
	sql string,
	bindVariables map[string]interface{},
	splitColumns []string,
	perShardSplitCount int64,
	numRowsPerQueryPart int64,
	algorithm querypb.SplitQueryRequest_Algorithm,
	shards []string,
	querySplitToQueryPartFunc func(
		querySplit *querytypes.QuerySplit, shard string) (*vtgatepb.SplitQueryResponse_Part, error),
	keyspace string) ([]*vtgatepb.SplitQueryResponse_Part, error)

SplitQuery scatters a SplitQuery request to the shards whose names are given in 'shards'. For every set of querytypes.QuerySplit's received from a shard, it applies the given 'querySplitToPartFunc' function to convert each querytypes.QuerySplit into a 'SplitQueryResponse_Part' message. Finally, it aggregates the obtained SplitQueryResponse_Parts across all shards and returns the resulting slice.

func (*ScatterConn) StreamExecute

func (stc *ScatterConn) StreamExecute(
	ctx context.Context,
	query string,
	bindVars map[string]interface{},
	keyspace string,
	shards []string,
	tabletType topodatapb.TabletType,
	options *querypb.ExecuteOptions,
	sendReply func(reply *sqltypes.Result) error,
) error

StreamExecute executes a streaming query on vttablet. The retry rules are the same.

func (*ScatterConn) StreamExecuteMulti

func (stc *ScatterConn) StreamExecuteMulti(
	ctx context.Context,
	query string,
	keyspace string,
	shardVars map[string]map[string]interface{},
	tabletType topodatapb.TabletType,
	options *querypb.ExecuteOptions,
	sendReply func(reply *sqltypes.Result) error,
) error

StreamExecuteMulti is like StreamExecute, but each shard gets its own bindVars. If len(shards) is not equal to len(bindVars), the function panics.

func (*ScatterConn) UpdateStream

func (stc *ScatterConn) UpdateStream(ctx context.Context, target *querypb.Target, timestamp int64, position string, sendReply func(*querypb.StreamEvent) error) error

UpdateStream just sends the query to the gateway, and sends the results back.

type ScatterConnError

type ScatterConnError struct {
	Retryable bool
	// Preserve the original errors, so that we don't need to parse the error string.
	Errs []error
	// contains filtered or unexported fields
}

ScatterConnError is the ScatterConn specific error. It implements vterrors.VtError.

func (*ScatterConnError) Error

func (e *ScatterConnError) Error() string

func (*ScatterConnError) VtErrorCode

func (e *ScatterConnError) VtErrorCode() vtrpcpb.ErrorCode

VtErrorCode returns the underlying Vitess error code This is part of vterrors.VtError interface.

type SrvKeyspaceCacheStatus

type SrvKeyspaceCacheStatus struct {
	Cell         string
	Keyspace     string
	Value        *topodatapb.SrvKeyspace
	LastError    error
	LastErrorCtx context.Context
}

SrvKeyspaceCacheStatus is the current value for a SrvKeyspace object

func (*SrvKeyspaceCacheStatus) StatusAsHTML

func (st *SrvKeyspaceCacheStatus) StatusAsHTML() template.HTML

StatusAsHTML returns an HTML version of our status. It works best if there is data in the cache.

type SrvKeyspaceCacheStatusList

type SrvKeyspaceCacheStatusList []*SrvKeyspaceCacheStatus

SrvKeyspaceCacheStatusList is used for sorting

func (SrvKeyspaceCacheStatusList) Len

func (skcsl SrvKeyspaceCacheStatusList) Len() int

Len is part of sort.Interface

func (SrvKeyspaceCacheStatusList) Less

func (skcsl SrvKeyspaceCacheStatusList) Less(i, j int) bool

Less is part of sort.Interface

func (SrvKeyspaceCacheStatusList) Swap

func (skcsl SrvKeyspaceCacheStatusList) Swap(i, j int)

Swap is part of sort.Interface

type SrvKeyspaceNamesCacheStatus

type SrvKeyspaceNamesCacheStatus struct {
	Cell         string
	Value        []string
	LastError    error
	LastErrorCtx context.Context
}

SrvKeyspaceNamesCacheStatus is the current value for SrvKeyspaceNames

type SrvKeyspaceNamesCacheStatusList

type SrvKeyspaceNamesCacheStatusList []*SrvKeyspaceNamesCacheStatus

SrvKeyspaceNamesCacheStatusList is used for sorting

func (SrvKeyspaceNamesCacheStatusList) Len

func (skncsl SrvKeyspaceNamesCacheStatusList) Len() int

Len is part of sort.Interface

func (SrvKeyspaceNamesCacheStatusList) Less

func (skncsl SrvKeyspaceNamesCacheStatusList) Less(i, j int) bool

Less is part of sort.Interface

func (SrvKeyspaceNamesCacheStatusList) Swap

func (skncsl SrvKeyspaceNamesCacheStatusList) Swap(i, j int)

Swap is part of sort.Interface

type TxConn

type TxConn struct {
	// contains filtered or unexported fields
}

TxConn is used for executing transactional requests.

func NewTxConn

func NewTxConn(gw gateway.Gateway) *TxConn

NewTxConn builds a new TxConn.

func (*TxConn) Commit

func (txc *TxConn) Commit(ctx context.Context, twopc bool, session *SafeSession) error

Commit commits the current transaction. If twopc is true, then the 2PC protocol is used to ensure atomicity.

func (*TxConn) Resume

func (txc *TxConn) Resume(ctx context.Context, dtid string) error

Resume resumes the specified 2PC transaction.

func (*TxConn) Rollback

func (txc *TxConn) Rollback(ctx context.Context, session *SafeSession) error

Rollback rolls back the current transaction. There are no retries on this operation.

func (*TxConn) RollbackIfNeeded

func (txc *TxConn) RollbackIfNeeded(ctx context.Context, err error, session *SafeSession)

RollbackIfNeeded rolls back the current transaction if the error implies that the transaction can never be completed.

type VSchemaKeyspaceStats

type VSchemaKeyspaceStats struct {
	Keyspace    string
	Sharded     bool
	TableCount  int
	VindexCount int
}

VSchemaKeyspaceStats contains a rollup of the VSchema stats for a keyspace. It is used to display a table with the information in the status page.

type VSchemaKeyspaceStatsList

type VSchemaKeyspaceStatsList []*VSchemaKeyspaceStats

VSchemaKeyspaceStatsList is to sort VSchemaKeyspaceStats by keyspace.

func (VSchemaKeyspaceStatsList) Len

func (l VSchemaKeyspaceStatsList) Len() int

Len is part of sort.Interface

func (VSchemaKeyspaceStatsList) Less

func (l VSchemaKeyspaceStatsList) Less(i, j int) bool

Less is part of sort.Interface

func (VSchemaKeyspaceStatsList) Swap

func (l VSchemaKeyspaceStatsList) Swap(i, j int)

Swap is part of sort.Interface

type VSchemaStats

type VSchemaStats struct {
	Error     string
	Keyspaces VSchemaKeyspaceStatsList
}

VSchemaStats contains a rollup of the VSchema stats.

func NewVSchemaStats

func NewVSchemaStats(vschema *vindexes.VSchema, errorMessage string) *VSchemaStats

NewVSchemaStats returns a new VSchemaStats from a VSchema.

type VTGate

type VTGate struct {
	// contains filtered or unexported fields
}

VTGate is the rpc interface to vtgate. Only one instance can be created. It implements vtgateservice.VTGateService

func Init

func Init(ctx context.Context, hc discovery.HealthCheck, topoServer topo.Server, serv topo.SrvTopoServer, cell string, retryCount int, tabletTypesToWait []topodatapb.TabletType) *VTGate

Init initializes VTGate server.

func (*VTGate) Begin

func (vtg *VTGate) Begin(ctx context.Context) (*vtgatepb.Session, error)

Begin begins a transaction. It has to be concluded by a Commit or Rollback.

func (*VTGate) Commit

func (vtg *VTGate) Commit(ctx context.Context, session *vtgatepb.Session) error

Commit commits a transaction.

func (*VTGate) Execute

func (vtg *VTGate) Execute(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool, options *querypb.ExecuteOptions) (*sqltypes.Result, error)

Execute executes a non-streaming query by routing based on the values in the query.

func (*VTGate) ExecuteBatchKeyspaceIds

func (vtg *VTGate) ExecuteBatchKeyspaceIds(ctx context.Context, queries []*vtgatepb.BoundKeyspaceIdQuery, tabletType topodatapb.TabletType, asTransaction bool, session *vtgatepb.Session, options *querypb.ExecuteOptions) ([]sqltypes.Result, error)

ExecuteBatchKeyspaceIds executes a group of queries based on the specified keyspace ids.

func (*VTGate) ExecuteBatchShards

func (vtg *VTGate) ExecuteBatchShards(ctx context.Context, queries []*vtgatepb.BoundShardQuery, tabletType topodatapb.TabletType, asTransaction bool, session *vtgatepb.Session, options *querypb.ExecuteOptions) ([]sqltypes.Result, error)

ExecuteBatchShards executes a group of queries on the specified shards.

func (*VTGate) ExecuteEntityIds

func (vtg *VTGate) ExecuteEntityIds(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, entityColumnName string, entityKeyspaceIDs []*vtgatepb.ExecuteEntityIdsRequest_EntityId, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool, options *querypb.ExecuteOptions) (*sqltypes.Result, error)

ExecuteEntityIds excutes a non-streaming query based on given KeyspaceId map.

func (*VTGate) ExecuteKeyRanges

func (vtg *VTGate) ExecuteKeyRanges(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyRanges []*topodatapb.KeyRange, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool, options *querypb.ExecuteOptions) (*sqltypes.Result, error)

ExecuteKeyRanges executes a non-streaming query based on the specified keyranges.

func (*VTGate) ExecuteKeyspaceIds

func (vtg *VTGate) ExecuteKeyspaceIds(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyspaceIds [][]byte, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool, options *querypb.ExecuteOptions) (*sqltypes.Result, error)

ExecuteKeyspaceIds executes a non-streaming query based on the specified keyspace ids.

func (*VTGate) ExecuteShards

func (vtg *VTGate) ExecuteShards(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, shards []string, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool, options *querypb.ExecuteOptions) (*sqltypes.Result, error)

ExecuteShards executes a non-streaming query on the specified shards.

func (*VTGate) GetGatewayCacheStatus

func (vtg *VTGate) GetGatewayCacheStatus() gateway.TabletCacheStatusList

GetGatewayCacheStatus returns a displayable version of the Gateway cache.

func (*VTGate) GetSrvKeyspace

func (vtg *VTGate) GetSrvKeyspace(ctx context.Context, keyspace string) (*topodatapb.SrvKeyspace, error)

GetSrvKeyspace is part of the vtgate service API.

func (*VTGate) HandlePanic

func (vtg *VTGate) HandlePanic(err *error)

HandlePanic recovers from panics, and logs / increment counters

func (*VTGate) IsHealthy

func (vtg *VTGate) IsHealthy() error

IsHealthy returns nil if server is healthy. Otherwise, it returns an error indicating the reason.

func (*VTGate) Rollback

func (vtg *VTGate) Rollback(ctx context.Context, session *vtgatepb.Session) error

Rollback rolls back a transaction.

func (*VTGate) SplitQuery

func (vtg *VTGate) SplitQuery(
	ctx context.Context,
	keyspace string,
	sql string,
	bindVariables map[string]interface{},
	splitColumns []string,
	splitCount int64,
	numRowsPerQueryPart int64,
	algorithm querypb.SplitQueryRequest_Algorithm) ([]*vtgatepb.SplitQueryResponse_Part, error)

SplitQuery implements the SplitQuery RPC. This is the new version that supports multiple split-columns and multiple splitting algorithms. See the documentation of SplitQueryRequest in "proto/vtgate.proto" for more information.

func (*VTGate) StreamExecute

func (vtg *VTGate) StreamExecute(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, tabletType topodatapb.TabletType, options *querypb.ExecuteOptions, sendReply func(*sqltypes.Result) error) error

StreamExecute executes a streaming query by routing based on the values in the query.

func (*VTGate) StreamExecuteKeyRanges

func (vtg *VTGate) StreamExecuteKeyRanges(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyRanges []*topodatapb.KeyRange, tabletType topodatapb.TabletType, options *querypb.ExecuteOptions, sendReply func(*sqltypes.Result) error) error

StreamExecuteKeyRanges executes a streaming query on the specified KeyRanges. The KeyRanges are resolved to shards using the serving graph. This function currently temporarily enforces the restriction of executing on one shard since it cannot merge-sort the results to guarantee ordering of response which is needed for checkpointing. The api supports supplying multiple keyranges to make it future proof.

func (*VTGate) StreamExecuteKeyspaceIds

func (vtg *VTGate) StreamExecuteKeyspaceIds(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyspaceIds [][]byte, tabletType topodatapb.TabletType, options *querypb.ExecuteOptions, sendReply func(*sqltypes.Result) error) error

StreamExecuteKeyspaceIds executes a streaming query on the specified KeyspaceIds. The KeyspaceIds are resolved to shards using the serving graph. This function currently temporarily enforces the restriction of executing on one shard since it cannot merge-sort the results to guarantee ordering of response which is needed for checkpointing. The api supports supplying multiple KeyspaceIds to make it future proof.

func (*VTGate) StreamExecuteShards

func (vtg *VTGate) StreamExecuteShards(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, shards []string, tabletType topodatapb.TabletType, options *querypb.ExecuteOptions, sendReply func(*sqltypes.Result) error) error

StreamExecuteShards executes a streaming query on the specified shards.

func (*VTGate) UpdateStream

func (vtg *VTGate) UpdateStream(ctx context.Context, keyspace string, shard string, keyRange *topodatapb.KeyRange, tabletType topodatapb.TabletType, timestamp int64, event *querypb.EventToken, sendReply func(*querypb.StreamEvent, int64) error) error

UpdateStream is part of the vtgate service API.

func (*VTGate) VSchemaStats

func (vtg *VTGate) VSchemaStats() *VSchemaStats

VSchemaStats returns the loaded vschema stats.

Directories

Path Synopsis
Package fakerpcvtgateconn provides a fake implementation of vtgateconn.Impl that doesn't do any RPC, but uses a local map to return results.
Package fakerpcvtgateconn provides a fake implementation of vtgateconn.Impl that doesn't do any RPC, but uses a local map to return results.
Package gateway contains the routing layer of vtgate.
Package gateway contains the routing layer of vtgate.
Package gatewaytest contains a test suite to run against a Gateway object.
Package gatewaytest contains a test suite to run against a Gateway object.
Package grpcvtgateconn provides gRPC connectivity for VTGate.
Package grpcvtgateconn provides gRPC connectivity for VTGate.
Package grpcvtgateservice provides the gRPC glue for vtgate
Package grpcvtgateservice provides the gRPC glue for vtgate
Package l2vtgate provides the core functionnality of a second-layer vtgate to route queries from an original vtgate to a subset of tablets.
Package l2vtgate provides the core functionnality of a second-layer vtgate to route queries from an original vtgate to a subset of tablets.
Package masterbuffer contains experimental logic to buffer master requests in VTGate.
Package masterbuffer contains experimental logic to buffer master requests in VTGate.
Package planbuilder allows you to build execution plans that describe how to fulfill a query that may span multiple keyspaces or shards.
Package planbuilder allows you to build execution plans that describe how to fulfill a query that may span multiple keyspaces or shards.
Package vtgateconntest provides the test methods to make sure a vtgateconn/vtgateservice pair over RPC works correctly.
Package vtgateconntest provides the test methods to make sure a vtgateconn/vtgateservice pair over RPC works correctly.
Package vtgateservice provides to interface definition for the vtgate service
Package vtgateservice provides to interface definition for the vtgate service

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