LogTracer

Tracer that dumps recorded traces to a logger.

Description

The LogTracer class allows you to create a tracer that dumps recorded traces to a logger.

Configuration parameters

options:

  • log_level: log level used to record traces (default: debug)

References

  • *:logger:*:*:1.0 - ILogger components to dump the captured counters
  • *:context-info:*:*:1.0 - (optional) ContextInfo used to detect the context id and specify a counter’s source

Constructors

NewLogTracer

Creates a new instance of the tracer.

NewLogTracer() *LogTracer

Methods

BeginTrace

Begings recording an operation trace.

(c *LogTracer) BeginTrace(ctx context.Context, context IContext, component string, operation string) *TraceTiming

  • ctx: context.Context - operation context.
  • context: IContext - (optional) a context to trace execution through a call chain.
  • component: string - name of the called component
  • operation: string - name of the executed operation.
  • return: *TraceTiming - trace timing object.

Configure

Configures component by passing configuration parameters.

(c *LogTracer) Configure(ctx context.Context, config *cconf.ConfigParams

  • ctx: context.Context - operation context.
  • config: *cconf.ConfigParams - configuration parameters to be set.

Failure

Records an operation failure with its name, duration and error

(c *LogTracer) Failure(ctx context.Context, context IContext, component string, operation string, err error, duration int64)

  • ctx: context.Context - operation context.
  • context: IContext - (optional) a context to trace execution through a call chain.
  • component: string - name of the called component
  • operation: string - name of the executed operation.
  • err: error - error object associated with this trace.
  • duration: int64 - execution duration in milliseconds.

SetReferences

Sets references to dependent components.

(c *LogTracer) SetReferences(ctx context.Context, references cref.IReferences)

  • ctx: context.Context - operation context.
  • references: cref.IReferences - references used to locate the component’s dependencies.

Trace

Records an operation trace with its name and duration.

(c *LogTracer) Trace(ctx context.Context, context IContext, component string, operation string, duration int64)

  • ctx: context.Context - operation context.
  • context: IContext - (optional) a context to trace execution through a call chain.
  • component: string - name of the called component
  • operation: string - name of the executed operation.
  • duration: int64 - execution duration in milliseconds.

Examples

tracer = NewLogTracer();
tracer.SetReferences(
	context.Background(),
	NewReferencesFromTuples(
		NewDescriptor("pip-services", "logger", "console", "default", "1.0"), NewConsoleLogger()
	)
);
timing := trcer.BeginTrace(context.Background(), "123", "mycomponent", "mymethod");
...
timing.EndTrace(context.Background());
if err != nil {
	timing.EndFailure(context.Background(), err);
}

See also