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Merge pull request #81 from lukasmacko/kafka
WIP: Refactor messaging + kafka
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,89 @@ | ||
| // Copyright (c) 2017 Cisco and/or its affiliates. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at: | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| package messaging | ||
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| import ( | ||
| "github.com/ligato/cn-infra/logging" | ||
| "github.com/ligato/cn-infra/logging/logroot" | ||
| "time" | ||
| ) | ||
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| // DefaultMsgTimeout for delivery of notification | ||
| const DefaultMsgTimeout = 2 * time.Second | ||
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| // ToProtoMsgChan allows to receive messages through channel instead of callback. | ||
| func ToProtoMsgChan(ch chan ProtoMessage, opts ...interface{}) func(ProtoMessage) { | ||
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| timeout, logger := ParseOpts(opts...) | ||
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| return func(msg ProtoMessage) { | ||
| select { | ||
| case ch <- msg: | ||
| case <-time.After(timeout): | ||
| logger.Warn("Unable to deliver message") | ||
| } | ||
| } | ||
| } | ||
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| // ToProtoMsgErrChan allows to receive error messages through channel instead of callback. | ||
| func ToProtoMsgErrChan(ch chan ProtoMessageErr, opts ...interface{}) func(ProtoMessageErr) { | ||
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| timeout, logger := ParseOpts(opts...) | ||
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| return func(msg ProtoMessageErr) { | ||
| select { | ||
| case ch <- msg: | ||
| case <-time.After(timeout): | ||
| logger.Warn("Unable to deliver message") | ||
| } | ||
| } | ||
| } | ||
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| // ParseOpts returns timeout and logger to be used based on the given options. | ||
| func ParseOpts(opts ...interface{}) (time.Duration, logging.Logger) { | ||
| timeout := DefaultMsgTimeout | ||
| logger := logroot.Logger() | ||
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| for _, opt := range opts { | ||
| switch opt.(type) { | ||
| case *WithLoggerOpt: | ||
| logger = opt.(*WithLoggerOpt).logger | ||
| case *WithTimeoutOpt: | ||
| timeout = opt.(*WithTimeoutOpt).timeout | ||
| } | ||
| } | ||
| return timeout, logger | ||
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| } | ||
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| // WithTimeoutOpt defines the maximum time that is attempted to deliver notification. | ||
| type WithTimeoutOpt struct { | ||
| timeout time.Duration | ||
| } | ||
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| // WithTimeout creates an option for ToChan function that defines a timeout for notification delivery. | ||
| func WithTimeout(timeout time.Duration) *WithTimeoutOpt { | ||
| return &WithTimeoutOpt{timeout: timeout} | ||
| } | ||
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| // WithLoggerOpt defines a logger that logs if delivery of notification is unsuccessful. | ||
| type WithLoggerOpt struct { | ||
| logger logging.Logger | ||
| } | ||
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| // WithLogger creates an option for ToChan function that specifies a logger to be used. | ||
| func WithLogger(logger logging.Logger) *WithLoggerOpt { | ||
| return &WithLoggerOpt{logger: logger} | ||
| } |
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