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* initial impl for nats data source * fix null data value * fix escaping problem with multiline comments in the sdl * add rootField to BaseDataSource * add addr and topic literals * update nats datasource to use directive definitions * add logging to nats data source * fix dependency injection * add missing copy value * add cleanup and additional logging * fix err logging
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| package execution | ||
|
|
||
| import ( | ||
| "github.com/jensneuse/graphql-go-tools/pkg/ast" | ||
| "github.com/jensneuse/graphql-go-tools/pkg/astvisitor" | ||
| "github.com/jensneuse/graphql-go-tools/pkg/lexer/literal" | ||
| "github.com/nats-io/nats.go" | ||
| "go.uber.org/zap" | ||
| "io" | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| type NatsDataSourcePlanner struct { | ||
| BaseDataSourcePlanner | ||
| } | ||
|
|
||
| func NewNatsDataSourcePlanner(baseDataSourcePlanner BaseDataSourcePlanner) *NatsDataSourcePlanner { | ||
| return &NatsDataSourcePlanner{ | ||
| BaseDataSourcePlanner: baseDataSourcePlanner, | ||
| } | ||
| } | ||
|
|
||
| func (n *NatsDataSourcePlanner) DirectiveName() []byte { | ||
| return []byte("NatsDataSource") | ||
| } | ||
|
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| func (n *NatsDataSourcePlanner) DirectiveDefinition() []byte { | ||
| data, _ := n.graphqlDefinitions.Find("directives/nats_datasource.graphql") | ||
| return data | ||
| } | ||
|
|
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| func (n *NatsDataSourcePlanner) Plan() (DataSource, []Argument) { | ||
| return &NatsDataSource{ | ||
| log: n.log, | ||
| }, n.args | ||
| } | ||
|
|
||
| func (n *NatsDataSourcePlanner) Initialize(walker *astvisitor.Walker, operation, definition *ast.Document, args []Argument, resolverParameters []ResolverParameter) { | ||
| n.walker, n.operation, n.definition, n.args = walker, operation, definition, args | ||
| } | ||
|
|
||
| func (n *NatsDataSourcePlanner) EnterInlineFragment(ref int) { | ||
|
|
||
| } | ||
|
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| func (n *NatsDataSourcePlanner) LeaveInlineFragment(ref int) { | ||
|
|
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| } | ||
|
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| func (n *NatsDataSourcePlanner) EnterSelectionSet(ref int) { | ||
|
|
||
| } | ||
|
|
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| func (n *NatsDataSourcePlanner) LeaveSelectionSet(ref int) { | ||
|
|
||
| } | ||
|
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| func (n *NatsDataSourcePlanner) EnterField(ref int) { | ||
| n.rootField.setIfNotDefined(ref) | ||
| } | ||
|
|
||
| func (n *NatsDataSourcePlanner) LeaveField(ref int) { | ||
| if !n.rootField.isDefinedAndEquals(ref) { | ||
| return | ||
| } | ||
| definition, exists := n.walker.FieldDefinition(ref) | ||
| if !exists { | ||
| return | ||
| } | ||
| directive, exists := n.definition.FieldDefinitionDirectiveByName(definition, n.DirectiveName()) | ||
| if !exists { | ||
| return | ||
| } | ||
| value, exists := n.definition.DirectiveArgumentValueByName(directive, literal.ADDR) | ||
| if !exists { | ||
| return | ||
| } | ||
| variableValue := n.definition.StringValueContentBytes(value.Ref) | ||
| arg := &StaticVariableArgument{ | ||
| Name: literal.ADDR, | ||
| Value: make([]byte, len(variableValue)), | ||
| } | ||
| copy(arg.Value, variableValue) | ||
| n.args = append(n.args, arg) | ||
|
|
||
| value, exists = n.definition.DirectiveArgumentValueByName(directive, literal.TOPIC) | ||
| if !exists { | ||
| return | ||
| } | ||
| variableValue = n.definition.StringValueContentBytes(value.Ref) | ||
| arg = &StaticVariableArgument{ | ||
| Name: literal.TOPIC, | ||
| Value: make([]byte, len(variableValue)), | ||
| } | ||
| copy(arg.Value, variableValue) | ||
| n.args = append(n.args, arg) | ||
| } | ||
|
|
||
| type NatsDataSource struct { | ||
| log *zap.Logger | ||
| conn *nats.Conn | ||
| sub *nats.Subscription | ||
| once sync.Once | ||
| } | ||
|
|
||
| func (n *NatsDataSource) Resolve(ctx Context, args ResolvedArgs, out io.Writer) Instruction { | ||
| var err error | ||
| n.once.Do(func() { | ||
|
|
||
| addrArg := args.ByKey(literal.ADDR) | ||
| topicArg := args.ByKey(literal.TOPIC) | ||
|
|
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| addr := nats.DefaultURL | ||
| topic := string(topicArg) | ||
|
|
||
| if len(addrArg) != 0 { | ||
| addr = string(addrArg) | ||
| } | ||
|
|
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| go func() { | ||
| <-ctx.Done() | ||
| if n.sub != nil { | ||
| n.log.Debug("NatsDataSource.unsubscribing", | ||
| zap.String("addr", addr), | ||
| zap.String("topic", topic), | ||
| ) | ||
| err := n.sub.Unsubscribe() | ||
| if err != nil { | ||
| n.log.Error("Unsubscribe", zap.Error(err)) | ||
| } | ||
| } | ||
| if n.conn != nil { | ||
| n.log.Debug("NatsDataSource.closing", | ||
| zap.String("addr", addr), | ||
| zap.String("topic", topic), | ||
| ) | ||
| n.conn.Close() | ||
| } | ||
| }() | ||
|
|
||
| n.log.Debug("NatsDataSource.connecting", | ||
| zap.String("addr", addr), | ||
| zap.String("topic", topic), | ||
| ) | ||
|
|
||
| n.conn, err = nats.Connect(addr) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
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| n.log.Debug("NatsDataSource.subscribing", | ||
| zap.String("addr", addr), | ||
| zap.String("topic", topic), | ||
| ) | ||
|
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| n.sub, err = n.conn.SubscribeSync(topic) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| }) | ||
|
|
||
| if err != nil { | ||
| return CloseConnection | ||
| } | ||
|
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| message, err := n.sub.NextMsg(time.Minute) | ||
| if err != nil { | ||
| return CloseConnection | ||
| } | ||
|
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| _, err = out.Write(message.Data) | ||
| if err != nil { | ||
| return CloseConnection | ||
| } | ||
|
|
||
| return KeepStreamAlive | ||
| } |
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