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9eaf824398
* add jaeger support, link hot container & req span * adds jaeger support now with FN_JAEGER_URL, there's a simple tutorial in the operating/metrics.md file now and it's pretty easy to get up and running. * links a hot request span to a hot container span. when we change this to sample at a lower ratio we'll need to finagle the hot container span to always sample or something, otherwise we'll hide that info. at least, since we're sampling at 100% for now if this is flipped on, can see freeze/unfreeze etc. if they hit. this is useful for debugging. note that zipkin's exporter does not follow the link at all, hence jaeger... and they're backed by the Cloud Empire now (CNCF) so we'll probably use it anyway. * vendor: add thrift for jaeger
60 lines
1.9 KiB
Go
60 lines
1.9 KiB
Go
// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package internal
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import (
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"errors"
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"google.golang.org/grpc/naming"
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)
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// PoolResolver provides a fixed list of addresses to load balance between
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// and does not provide further updates.
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type PoolResolver struct {
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poolSize int
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dialOpt *DialSettings
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ch chan []*naming.Update
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}
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// NewPoolResolver returns a PoolResolver
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// This is an EXPERIMENTAL API and may be changed or removed in the future.
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func NewPoolResolver(size int, o *DialSettings) *PoolResolver {
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return &PoolResolver{poolSize: size, dialOpt: o}
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}
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// Resolve returns a Watcher for the endpoint defined by the DialSettings
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// provided to NewPoolResolver.
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func (r *PoolResolver) Resolve(target string) (naming.Watcher, error) {
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if r.dialOpt.Endpoint == "" {
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return nil, errors.New("No endpoint configured")
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}
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addrs := make([]*naming.Update, 0, r.poolSize)
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for i := 0; i < r.poolSize; i++ {
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addrs = append(addrs, &naming.Update{Op: naming.Add, Addr: r.dialOpt.Endpoint, Metadata: i})
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}
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r.ch = make(chan []*naming.Update, 1)
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r.ch <- addrs
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return r, nil
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}
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// Next returns a static list of updates on the first call,
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// and blocks indefinitely until Close is called on subsequent calls.
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func (r *PoolResolver) Next() ([]*naming.Update, error) {
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return <-r.ch, nil
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}
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func (r *PoolResolver) Close() {
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close(r.ch)
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}
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