Golang Manager Examples

Example #1

File: pindex_bleve.go Project: WillGardella/cbft

// Returns a bleve.IndexAlias that represents all the PIndexes for the
// index, including perhaps bleve remote client PIndexes.
//
// TODO: Perhaps need a tighter check around indexUUID, as the current
// implementation might have a race where old pindexes with a matching
// (but invalid) indexUUID might be hit.
//
// TODO: If this returns an error, perhaps the caller somewhere up the
// chain should close the cancelCh to help stop any other inflight
// activities.
func bleveIndexAlias(mgr *cbgt.Manager, indexName, indexUUID string,
	ensureCanRead bool, consistencyParams *cbgt.ConsistencyParams,
	cancelCh <-chan bool) (bleve.IndexAlias, error) {
	planPIndexNodeFilter := cbgt.PlanPIndexNodeOk
	if ensureCanRead {
		planPIndexNodeFilter = cbgt.PlanPIndexNodeCanRead
	}

	localPIndexes, remotePlanPIndexes, err :=
		mgr.CoveringPIndexes(indexName, indexUUID, planPIndexNodeFilter,
			"queries")
	if err != nil {
		return nil, fmt.Errorf("bleve: bleveIndexAlias, err: %v", err)
	}

	alias := bleve.NewIndexAlias()

	for _, remotePlanPIndex := range remotePlanPIndexes {
		baseURL := "http://" + remotePlanPIndex.NodeDef.HostPort +
			"/api/pindex/" + remotePlanPIndex.PlanPIndex.Name
		alias.Add(&IndexClient{
			QueryURL:    baseURL + "/query",
			CountURL:    baseURL + "/count",
			Consistency: consistencyParams,
			// TODO: Propagate auth to remote client.
		})
	}

	// TODO: Should kickoff remote queries concurrently before we wait.

	err = cbgt.ConsistencyWaitGroup(indexName, consistencyParams,
		cancelCh, localPIndexes,
		func(localPIndex *cbgt.PIndex) error {
			bindex, ok := localPIndex.Impl.(bleve.Index)
			if !ok || bindex == nil ||
				!strings.HasPrefix(localPIndex.IndexType, "bleve") {
				return fmt.Errorf("bleve: wrong type, localPIndex: %#v",
					localPIndex)
			}
			alias.Add(bindex)
			return nil
		})
	if err != nil {
		return nil, err
	}

	return alias, nil
}

Example #2

File: pindex_alias.go Project: WillGardella/cbft

// The indexName/indexUUID is for a user-defined index alias.
//
// TODO: One day support user-defined aliases for non-bleve indexes.
func bleveIndexAliasForUserIndexAlias(mgr *cbgt.Manager,
	indexName, indexUUID string, ensureCanRead bool,
	consistencyParams *cbgt.ConsistencyParams,
	cancelCh <-chan bool) (
	bleve.IndexAlias, error) {
	alias := bleve.NewIndexAlias()

	indexDefs, _, err := cbgt.CfgGetIndexDefs(mgr.Cfg())
	if err != nil {
		return nil, fmt.Errorf("alias: could not get indexDefs,"+
			" indexName: %s, err: %v", indexName, err)
	}

	num := 0

	var fillAlias func(aliasName, aliasUUID string) error

	fillAlias = func(aliasName, aliasUUID string) error {
		aliasDef := indexDefs.IndexDefs[aliasName]
		if aliasDef == nil {
			return fmt.Errorf("alias: could not get aliasDef,"+
				" aliasName: %s, indexName: %s",
				aliasName, indexName)
		}
		if aliasDef.Type != "alias" {
			return fmt.Errorf("alias: not alias type: %s,"+
				" aliasName: %s, indexName: %s",
				aliasDef.Type, aliasName, indexName)
		}
		if aliasUUID != "" &&
			aliasUUID != aliasDef.UUID {
			return fmt.Errorf("alias: mismatched aliasUUID: %s,"+
				" aliasDef.UUID: %s, aliasName: %s, indexName: %s",
				aliasUUID, aliasDef.UUID, aliasName, indexName)
		}

		params := AliasParams{}
		err := json.Unmarshal([]byte(aliasDef.Params), &params)
		if err != nil {
			return fmt.Errorf("alias: could not parse aliasDef.Params: %s,"+
				" aliasName: %s, indexName: %s",
				aliasDef.Params, aliasName, indexName)
		}

		for targetName, targetSpec := range params.Targets {
			if num > maxAliasTargets {
				return fmt.Errorf("alias: too many alias targets,"+
					" perhaps there's a cycle,"+
					" aliasName: %s, indexName: %s",
					aliasName, indexName)
			}
			targetDef := indexDefs.IndexDefs[targetName]
			if targetDef == nil {
				return fmt.Errorf("alias: the alias depends upon"+
					" a target index that does not exist,"+
					" targetName: %q, aliasName: %q",
					targetName, aliasName)
			}
			if targetSpec.IndexUUID != "" &&
				targetSpec.IndexUUID != targetDef.UUID {
				return fmt.Errorf("alias: mismatched targetSpec.UUID: %s,"+
					" targetDef.UUID: %s, targetName: %s,"+
					" aliasName: %s, indexName: %s",
					targetSpec.IndexUUID, targetDef.UUID, targetName,
					aliasName, indexName)
			}

			// TODO: Convert to registered callbacks instead of if-else-if.
			if targetDef.Type == "alias" {
				err = fillAlias(targetName, targetSpec.IndexUUID)
				if err != nil {
					return err
				}
			} else if strings.HasPrefix(targetDef.Type, "bleve") {
				subAlias, err := bleveIndexAlias(mgr, targetName,
					targetSpec.IndexUUID, ensureCanRead,
					consistencyParams, cancelCh)
				if err != nil {
					return err
				}
				alias.Add(subAlias)
				num += 1
			} else {
				return fmt.Errorf("alias: unsupported target type: %s,"+
					" targetName: %s, aliasName: %s, indexName: %s",
					targetDef.Type, targetName, aliasName, indexName)
			}
		}

		return nil
	}

	err = fillAlias(indexName, indexUUID)
	if err != nil {
		return nil, err
	}

	return alias, nil
}