前面讀的是 2.19.2 版本的代碼，最新更新了 2.24.1，發(fā)現(xiàn)在實(shí)例化 Discoverer 時(shí)改進(jìn)了設(shè)計(jì)。這個(gè)改變是在 2.21 做出的。

2.19.2 中的實(shí)現(xiàn)方式

在 discovery.Manager 結(jié)構(gòu)體中包含了一個(gè) *provider 的 slice

type Manager struct {...// providers keeps track of SD providers.providers []*provider... }

provider 接口提包含了一個(gè) Discoverer 接口類型的字段

// provider holds a Discoverer instance, its configuration and its subscribers. type provider struct {name stringd Discoverersubs []stringconfig interface{} }

實(shí)例化 Discoverer 是在 *Manager 的 registerProviders() 方法中實(shí)現(xiàn)的，每個(gè) job 有一套 Provider

方法簽名為

func (m *Manager) registerProviders(cfg sd_config.ServiceDiscoveryConfig, setName string) int

參數(shù) cfg 是解析配置文件參數(shù)得到的各種 SD 類型

// ServiceDiscoveryConfig configures lists of different service discovery mechanisms. type ServiceDiscoveryConfig struct {// List of labeled target groups for this job.StaticConfigs []*targetgroup.Group `yaml:"static_configs,omitempty"`// List of DNS service discovery configurations.DNSSDConfigs []*dns.SDConfig `yaml:"dns_sd_configs,omitempty"`// List of file service discovery configurations.FileSDConfigs []*file.SDConfig `yaml:"file_sd_configs,omitempty"`// List of Consul service discovery configurations.ConsulSDConfigs []*consul.SDConfig `yaml:"consul_sd_configs,omitempty"`// List of DigitalOcean service discovery configurations.DigitalOceanSDConfigs []*digitalocean.SDConfig `yaml:"digitalocean_sd_configs,omitempty"`// List of Docker Swarm service discovery configurations.DockerSwarmSDConfigs []*dockerswarm.SDConfig `yaml:"dockerswarm_sd_configs,omitempty"`// List of Serverset service discovery configurations.ServersetSDConfigs []*zookeeper.ServersetSDConfig `yaml:"serverset_sd_configs,omitempty"`// NerveSDConfigs is a list of Nerve service discovery configurations.NerveSDConfigs []*zookeeper.NerveSDConfig `yaml:"nerve_sd_configs,omitempty"`// MarathonSDConfigs is a list of Marathon service discovery configurations.MarathonSDConfigs []*marathon.SDConfig `yaml:"marathon_sd_configs,omitempty"`// List of Kubernetes service discovery configurations.KubernetesSDConfigs []*kubernetes.SDConfig `yaml:"kubernetes_sd_configs,omitempty"`// List of GCE service discovery configurations.GCESDConfigs []*gce.SDConfig `yaml:"gce_sd_configs,omitempty"`// List of EC2 service discovery configurations.EC2SDConfigs []*ec2.SDConfig `yaml:"ec2_sd_configs,omitempty"`// List of OpenStack service discovery configurations.OpenstackSDConfigs []*openstack.SDConfig `yaml:"openstack_sd_configs,omitempty"`// List of Azure service discovery configurations.AzureSDConfigs []*azure.SDConfig `yaml:"azure_sd_configs,omitempty"`// List of Triton service discovery configurations.TritonSDConfigs []*triton.SDConfig `yaml:"triton_sd_configs,omitempty"` }

方法內(nèi)部首先聲名一個(gè)添加 Discoverer 的閉包函數(shù) add()，閉包函數(shù)的參數(shù)有一個(gè)實(shí)例化 Discoverer 的方法

add := func(cfg interface{}, newDiscoverer func() (Discoverer, error)) {t := reflect.TypeOf(cfg).String()// 已有的 provider 如果有多個(gè) job 配置了它就把 job_name 追加到 這個(gè)provider 的 subs 中。// 否則就新建 providerfor _, p := range m.providers {if reflect.DeepEqual(cfg, p.config) {p.subs = append(p.subs, setName)level.Info(m.logger).Log("msg", "append subscribers", "sub", p.subs)added = truereturn}}d, err := newDiscoverer()if err != nil {level.Error(m.logger).Log("msg", "Cannot create service discovery", "err", err, "type", t)failedCount++return}provider := provider{name: fmt.Sprintf("%s/%d", t, len(m.providers)),d: d,config: cfg,subs: []string{setName},}m.providers = append(m.providers, &provider)added = true}

遍歷配置文件配置的每種服務(wù)發(fā)現(xiàn)的類型，調(diào)用這種類型的實(shí)例化方法（如 dns.NewDiscovery()）來(lái)初始化這種SD。

for _, c := range cfg.DNSSDConfigs {add(c, func() (Discoverer, error) {return dns.NewDiscovery(*c, log.With(m.logger, "discovery", "dns")), nil})}for _, c := range cfg.FileSDConfigs {add(c, func() (Discoverer, error) {return file.NewDiscovery(c, log.With(m.logger, "discovery", "file")), nil})}for _, c := range cfg.ConsulSDConfigs {add(c, func() (Discoverer, error) {return consul.NewDiscovery(c, log.With(m.logger, "discovery", "consul"))})}...

這種模式要在 manager.go 文件中導(dǎo)入每一種具體的服務(wù)發(fā)現(xiàn)器，也就是要在抽象層依賴各個(gè)實(shí)現(xiàn)。

2.24.1 中的實(shí)現(xiàn)方式

Manager 包裝 provider 包裝 Discoverer 沒有變化

*Manager.registerProviders() 方法的參數(shù)變?yōu)榱?Config 切片，Config 是接口類型，其中要求實(shí)現(xiàn)類要有 NewDiscoverer(DiscovererOptions) (Discoverer, error) 方法。

// Configs is a slice of Config values that uses custom YAML marshaling and unmarshaling // to represent itself as a mapping of the Config values grouped by their types. type Configs []Config// A Config provides the configuration and constructor for a Discoverer. type Config interface {// Name returns the name of the discovery mechanism.Name() string// NewDiscoverer returns a Discoverer for the Config// with the given DiscovererOptions.NewDiscoverer(DiscovererOptions) (Discoverer, error) }

*Manager.registerProviders() 里面的 add 閉包函數(shù)的初始化 Discoverer 方法是調(diào)用接口要求的 NewDiscoverer() 方法

d, err := cfg.NewDiscoverer(DiscovererOptions{Logger: log.With(m.logger, "discovery", typ),})

遍歷也簡(jiǎn)化了

for _, cfg := range cfgs {add(cfg)}

在 main() 里依賴了 /discovery/install，這個(gè)新增的 install 包中導(dǎo)入具體的 SD 作為依賴

package installimport (_ "github.com/prometheus/prometheus/discovery/azure" // register azure_ "github.com/prometheus/prometheus/discovery/consul" // register consul_ "github.com/prometheus/prometheus/discovery/digitalocean" // register digitalocean_ "github.com/prometheus/prometheus/discovery/dns" // register dns_ "github.com/prometheus/prometheus/discovery/dockerswarm" // register dockerswarm_ "github.com/prometheus/prometheus/discovery/ec2" // register ec2_ "github.com/prometheus/prometheus/discovery/eureka" // register eureka_ "github.com/prometheus/prometheus/discovery/file" // register file_ "github.com/prometheus/prometheus/discovery/gce" // register gce_ "github.com/prometheus/prometheus/discovery/hetzner" // register hetzner_ "github.com/prometheus/prometheus/discovery/kubernetes" // register kubernetes_ "github.com/prometheus/prometheus/discovery/marathon" // register marathon_ "github.com/prometheus/prometheus/discovery/openstack" // register openstack_ "github.com/prometheus/prometheus/discovery/triton" // register triton_ "github.com/prometheus/prometheus/discovery/zookeeper" // register zookeeper )

每一個(gè)具體的 SD 依賴 /discovery/dicovery，實(shí)現(xiàn)接口的 NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) 方法

// NewDiscoverer returns a Discoverer for the Config. func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {return NewDiscovery(c, opts.Logger), nil }

返回的是調(diào)用本 SD 自己的 NewDiscovery() 函數(shù)得到的具體的SD實(shí)例

// NewDiscovery returns a new file discovery for the given paths. func NewDiscovery(conf *SDConfig, logger log.Logger) *Discovery {if logger == nil {logger = log.NewNopLogger()}disc := &Discovery{paths: conf.Files,interval: time.Duration(conf.RefreshInterval),timestamps: make(map[string]float64),logger: logger,}fileSDTimeStamp.addDiscoverer(disc)return disc }

模式學(xué)習(xí)

這樣就實(shí)現(xiàn)了由抽象依賴實(shí)現(xiàn)翻轉(zhuǎn)為實(shí)現(xiàn)依賴抽象。

install 是一個(gè)中介包，main 依賴它，它的內(nèi)部導(dǎo)入各個(gè)具體的 SD 實(shí)現(xiàn)包，這樣集中了多個(gè)具體實(shí)現(xiàn)的導(dǎo)入位置便于修改，也使 main 的導(dǎo)入部分變得簡(jiǎn)潔。

之前的依賴順序

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text{fill:#9370db;stroke:none;font-size:10px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-xcc1xWU9QtLwBNcH g.stateGroup text{fill:#9370db;fill:#333;stroke:none;font-size:10px}#mermaid-svg-xcc1xWU9QtLwBNcH g.statediagram-cluster .cluster-label text{fill:#333}#mermaid-svg-xcc1xWU9QtLwBNcH g.stateGroup .state-title{font-weight:bolder;fill:#000}#mermaid-svg-xcc1xWU9QtLwBNcH g.stateGroup rect{fill:#ECECFF;stroke:#9370db}#mermaid-svg-xcc1xWU9QtLwBNcH g.stateGroup line{stroke:#9370db;stroke-width:1}#mermaid-svg-xcc1xWU9QtLwBNcH .transition{stroke:#9370db;stroke-width:1;fill:none}#mermaid-svg-xcc1xWU9QtLwBNcH .stateGroup .composit{fill:white;border-bottom:1px}#mermaid-svg-xcc1xWU9QtLwBNcH .stateGroup .alt-composit{fill:#e0e0e0;border-bottom:1px}#mermaid-svg-xcc1xWU9QtLwBNcH .state-note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-xcc1xWU9QtLwBNcH .state-note text{fill:black;stroke:none;font-size:10px}#mermaid-svg-xcc1xWU9QtLwBNcH .stateLabel .box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.7}#mermaid-svg-xcc1xWU9QtLwBNcH .edgeLabel text{fill:#333}#mermaid-svg-xcc1xWU9QtLwBNcH .stateLabel text{fill:#000;font-size:10px;font-weight:bold;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-xcc1xWU9QtLwBNcH .node circle.state-start{fill:black;stroke:black}#mermaid-svg-xcc1xWU9QtLwBNcH .node circle.state-end{fill:black;stroke:white;stroke-width:1.5}#mermaid-svg-xcc1xWU9QtLwBNcH #statediagram-barbEnd{fill:#9370db}#mermaid-svg-xcc1xWU9QtLwBNcH .statediagram-cluster rect{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-xcc1xWU9QtLwBNcH .statediagram-cluster rect.outer{rx:5px;ry:5px}#mermaid-svg-xcc1xWU9QtLwBNcH .statediagram-state .divider{stroke:#9370db}#mermaid-svg-xcc1xWU9QtLwBNcH .statediagram-state .title-state{rx:5px;ry:5px}#mermaid-svg-xcc1xWU9QtLwBNcH .statediagram-cluster.statediagram-cluster .inner{fill:white}#mermaid-svg-xcc1xWU9QtLwBNcH .statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-xcc1xWU9QtLwBNcH .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-xcc1xWU9QtLwBNcH .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-xcc1xWU9QtLwBNcH .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-xcc1xWU9QtLwBNcH .note-edge{stroke-dasharray:5}#mermaid-svg-xcc1xWU9QtLwBNcH .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-xcc1xWU9QtLwBNcH .error-icon{fill:#522}#mermaid-svg-xcc1xWU9QtLwBNcH .error-text{fill:#522;stroke:#522}#mermaid-svg-xcc1xWU9QtLwBNcH .edge-thickness-normal{stroke-width:2px}#mermaid-svg-xcc1xWU9QtLwBNcH .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-xcc1xWU9QtLwBNcH .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-xcc1xWU9QtLwBNcH .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-xcc1xWU9QtLwBNcH .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-xcc1xWU9QtLwBNcH .marker{fill:#333}#mermaid-svg-xcc1xWU9QtLwBNcH .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-xcc1xWU9QtLwBNcH {color: rgba(0, 0, 0, 0.75);font: ;}maindiscoveryconsulfileec2kubernetes

如果添加一個(gè) SD，需要添加 discovery/config/config.go 和 discovery/manager.go 中的依賴，并且要添加 *Manager.registerProviders() 的代碼

---

現(xiàn)在的依賴順序

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text{fill:#9370db;stroke:none;font-size:10px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-bYPvnATnn8JbkKVI g.stateGroup text{fill:#9370db;fill:#333;stroke:none;font-size:10px}#mermaid-svg-bYPvnATnn8JbkKVI g.statediagram-cluster .cluster-label text{fill:#333}#mermaid-svg-bYPvnATnn8JbkKVI g.stateGroup .state-title{font-weight:bolder;fill:#000}#mermaid-svg-bYPvnATnn8JbkKVI g.stateGroup rect{fill:#ECECFF;stroke:#9370db}#mermaid-svg-bYPvnATnn8JbkKVI g.stateGroup line{stroke:#9370db;stroke-width:1}#mermaid-svg-bYPvnATnn8JbkKVI .transition{stroke:#9370db;stroke-width:1;fill:none}#mermaid-svg-bYPvnATnn8JbkKVI .stateGroup .composit{fill:white;border-bottom:1px}#mermaid-svg-bYPvnATnn8JbkKVI .stateGroup .alt-composit{fill:#e0e0e0;border-bottom:1px}#mermaid-svg-bYPvnATnn8JbkKVI .state-note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-bYPvnATnn8JbkKVI .state-note text{fill:black;stroke:none;font-size:10px}#mermaid-svg-bYPvnATnn8JbkKVI .stateLabel .box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.7}#mermaid-svg-bYPvnATnn8JbkKVI .edgeLabel text{fill:#333}#mermaid-svg-bYPvnATnn8JbkKVI .stateLabel text{fill:#000;font-size:10px;font-weight:bold;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-bYPvnATnn8JbkKVI .node circle.state-start{fill:black;stroke:black}#mermaid-svg-bYPvnATnn8JbkKVI .node circle.state-end{fill:black;stroke:white;stroke-width:1.5}#mermaid-svg-bYPvnATnn8JbkKVI #statediagram-barbEnd{fill:#9370db}#mermaid-svg-bYPvnATnn8JbkKVI .statediagram-cluster rect{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-bYPvnATnn8JbkKVI .statediagram-cluster rect.outer{rx:5px;ry:5px}#mermaid-svg-bYPvnATnn8JbkKVI .statediagram-state .divider{stroke:#9370db}#mermaid-svg-bYPvnATnn8JbkKVI .statediagram-state .title-state{rx:5px;ry:5px}#mermaid-svg-bYPvnATnn8JbkKVI .statediagram-cluster.statediagram-cluster .inner{fill:white}#mermaid-svg-bYPvnATnn8JbkKVI .statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-bYPvnATnn8JbkKVI .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-bYPvnATnn8JbkKVI .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-bYPvnATnn8JbkKVI .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-bYPvnATnn8JbkKVI .note-edge{stroke-dasharray:5}#mermaid-svg-bYPvnATnn8JbkKVI .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-bYPvnATnn8JbkKVI .error-icon{fill:#522}#mermaid-svg-bYPvnATnn8JbkKVI .error-text{fill:#522;stroke:#522}#mermaid-svg-bYPvnATnn8JbkKVI .edge-thickness-normal{stroke-width:2px}#mermaid-svg-bYPvnATnn8JbkKVI .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-bYPvnATnn8JbkKVI .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-bYPvnATnn8JbkKVI .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-bYPvnATnn8JbkKVI .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-bYPvnATnn8JbkKVI .marker{fill:#333}#mermaid-svg-bYPvnATnn8JbkKVI .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-bYPvnATnn8JbkKVI {color: rgba(0, 0, 0, 0.75);font: ;}maininstallconsulfileec2kubernetesdiscovery

如果添加一個(gè) SD，僅需要添加 discovery/install/install.go，刪除了 discovery/config/ 目錄

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