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Merge pull request #175 from jrasell/f_gh_58
Addition of template functions allow Consul and Time lookups.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| package client | ||
|
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| import ( | ||
| consul "github.com/hashicorp/consul/api" | ||
| ) | ||
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| // NewConsulClient is used to create a new client to interact with Consul. | ||
| func NewConsulClient(addr string) (*consul.Client, error) { | ||
| config := consul.DefaultConfig() | ||
|
|
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| if addr != "" { | ||
| config.Address = addr | ||
| } | ||
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| c, err := consul.NewClient(config) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| return c, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| package template | ||
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| import ( | ||
| "errors" | ||
| "text/template" | ||
| "time" | ||
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| consul "github.com/hashicorp/consul/api" | ||
| "github.com/rs/zerolog/log" | ||
| ) | ||
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| // funcMap builds the template functions and passes the consulClient where this | ||
| // is required. | ||
| func funcMap(consulClient *consul.Client) template.FuncMap { | ||
| return template.FuncMap{ | ||
| "consulKey": consulKeyFunc(consulClient), | ||
| "consulKeyExists": consulKeyExistsFunc(consulClient), | ||
| "consulKeyOrDefault": consulKeyOrDefaultFunc(consulClient), | ||
| "timeNow": timeNowFunc, | ||
| "timeNowUTC": timeNowUTCFunc, | ||
| "timeNowTimezone": timeNowTimezoneFunc(), | ||
| } | ||
| } | ||
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| func consulKeyFunc(consulClient *consul.Client) func(string) (string, error) { | ||
| return func(s string) (string, error) { | ||
|
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| if len(s) == 0 { | ||
| return "", nil | ||
| } | ||
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| kv, _, err := consulClient.KV().Get(s, nil) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| if kv == nil { | ||
| return "", errors.New("Consul KV not found") | ||
| } | ||
|
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| v := string(kv.Value[:]) | ||
| log.Info().Msgf("template/funcs: using Consul KV variable with key %s and value %s", | ||
| s, v) | ||
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| return v, nil | ||
| } | ||
| } | ||
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| func consulKeyExistsFunc(consulClient *consul.Client) func(string) (bool, error) { | ||
| return func(s string) (bool, error) { | ||
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| if len(s) == 0 { | ||
| return false, nil | ||
| } | ||
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| kv, _, err := consulClient.KV().Get(s, nil) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
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| if kv == nil { | ||
| return false, nil | ||
| } | ||
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| log.Info().Msgf("template/funcs: found Consul KV variable with key %s", s) | ||
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| return true, nil | ||
| } | ||
| } | ||
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| func consulKeyOrDefaultFunc(consulClient *consul.Client) func(string, string) (string, error) { | ||
| return func(s, d string) (string, error) { | ||
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| if len(s) == 0 { | ||
| log.Info().Msgf("template/funcs: using default Consul KV variable with value %s", d) | ||
| return d, nil | ||
| } | ||
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| kv, _, err := consulClient.KV().Get(s, nil) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
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| if kv == nil { | ||
| log.Info().Msgf("template/funcs: using default Consul KV variable with value %s", d) | ||
| return d, nil | ||
| } | ||
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| v := string(kv.Value[:]) | ||
| log.Info().Msgf("template/funcs: using Consul KV variable with key %s and value %s", | ||
| s, v) | ||
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| return v, nil | ||
| } | ||
| } | ||
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| func timeNowFunc() string { | ||
| return time.Now().Format("2006-01-02T15:04:05Z07:00") | ||
| } | ||
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| func timeNowUTCFunc() string { | ||
| return time.Now().UTC().Format("2006-01-02T15:04:05Z07:00") | ||
| } | ||
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| func timeNowTimezoneFunc() func(string) (string, error) { | ||
| return func(t string) (string, error) { | ||
|
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| if t == "" { | ||
| return "", nil | ||
| } | ||
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| loc, err := time.LoadLocation(t) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
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| return time.Now().In(loc).Format("2006-01-02T15:04:05Z07:00"), nil | ||
| } | ||
| } |
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