Refactor client fingerprinters to return a diff of node attributes #3781
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -23,6 +23,7 @@ import ( | |
| "github.com/hashicorp/nomad/client/driver" | ||
| "github.com/hashicorp/nomad/client/fingerprint" | ||
| "github.com/hashicorp/nomad/client/stats" | ||
| cstructs "github.com/hashicorp/nomad/client/structs" | ||
| "github.com/hashicorp/nomad/client/vaultclient" | ||
| "github.com/hashicorp/nomad/command/agent/consul" | ||
| "github.com/hashicorp/nomad/helper" | ||
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@@ -931,33 +932,38 @@ func (c *Client) fingerprint() error { | |
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| c.logger.Printf("[DEBUG] client: built-in fingerprints: %v", fingerprint.BuiltinFingerprints()) | ||
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| var appliedFingerprints []string | ||
| var skippedFingerprints []string | ||
| for _, name := range fingerprint.BuiltinFingerprints() { | ||
| // Skip modules that are not in the whitelist if it is enabled. | ||
| if _, ok := whitelist[name]; whitelistEnabled && !ok { | ||
| skippedFingerprints = append(skippedFingerprints, name) | ||
| continue | ||
| } | ||
| // Skip modules that are in the blacklist | ||
| if _, ok := blacklist[name]; ok { | ||
| skippedFingerprints = append(skippedFingerprints, name) | ||
| continue | ||
| } | ||
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| f, err := fingerprint.NewFingerprint(name, c.logger) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| // Apply the finerprint to our list so that we can log it later | ||
| appliedFingerprints = append(appliedFingerprints, name) | ||
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| request := &cstructs.FingerprintRequest{Config: c.config, Node: c.config.Node} | ||
| var response cstructs.FingerprintResponse | ||
| err = f.Fingerprint(request, &response) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| // add the diff found from each fingerprinter | ||
| c.updateNodeFromFingerprint(&response) | ||
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| p, period := f.Periodic() | ||
| if p { | ||
| // TODO: If more periodic fingerprinters are added, then | ||
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@@ -966,9 +972,10 @@ func (c *Client) fingerprint() error { | |
| go c.fingerprintPeriodic(name, f, period) | ||
| } | ||
| } | ||
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| c.logger.Printf("[DEBUG] client: applied fingerprints %v", appliedFingerprints) | ||
| if len(skippedFingerprints) != 0 { | ||
| c.logger.Printf("[DEBUG] client: fingerprint modules skipped due to white/blacklist: %v", skippedFingerprints) | ||
| } | ||
| return nil | ||
| } | ||
|
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@@ -979,11 +986,16 @@ func (c *Client) fingerprintPeriodic(name string, f fingerprint.Fingerprint, d t | |
| for { | ||
| select { | ||
| case <-time.After(d): | ||
| request := &cstructs.FingerprintRequest{Config: c.config, Node: c.config.Node} | ||
| var response cstructs.FingerprintResponse | ||
|
There was a problem hiding this comment. The lock should wrap creating the request since it is accessing the config. (not just here) |
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| err := f.Fingerprint(request, &response) | ||
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| if err != nil { | ||
| c.logger.Printf("[DEBUG] client: periodic fingerprinting for %v failed: %v", name, err) | ||
| } else { | ||
| c.updateNodeFromFingerprint(&response) | ||
| } | ||
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| case <-c.shutdownCh: | ||
| return | ||
| } | ||
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@@ -997,35 +1009,38 @@ func (c *Client) setupDrivers() error { | |
| whitelistEnabled := len(whitelist) > 0 | ||
| blacklist := c.config.ReadStringListToMap("driver.blacklist") | ||
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| var availDrivers []string | ||
| var skippedDrivers []string | ||
| driverCtx := driver.NewDriverContext("", "", c.config, c.config.Node, c.logger, nil) | ||
| for name := range driver.BuiltinDrivers { | ||
| // Skip fingerprinting drivers that are not in the whitelist if it is | ||
| // enabled. | ||
| if _, ok := whitelist[name]; whitelistEnabled && !ok { | ||
| skippedDrivers = append(skippedDrivers, name) | ||
| continue | ||
| } | ||
| // Skip fingerprinting drivers that are in the blacklist | ||
| if _, ok := blacklist[name]; ok { | ||
| skippedDrivers = append(skippedDrivers, name) | ||
| continue | ||
| } | ||
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| // Add this driver to our list of available drivers so that we can log it | ||
| // later | ||
| availDrivers = append(availDrivers, name) | ||
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| d, err := driver.NewDriver(name, driverCtx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| request := &cstructs.FingerprintRequest{Config: c.config, Node: c.config.Node} | ||
| var response cstructs.FingerprintResponse | ||
| if err := d.Fingerprint(request, &response); err != nil { | ||
| return err | ||
| } | ||
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| c.updateNodeFromFingerprint(&response) | ||
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| p, period := d.Periodic() | ||
| if p { | ||
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@@ -1034,15 +1049,40 @@ func (c *Client) setupDrivers() error { | |
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| } | ||
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| c.logger.Printf("[DEBUG] client: available drivers %v", availDrivers) | ||
| if len(skippedDrivers) > 0 { | ||
| c.logger.Printf("[DEBUG] client: drivers skipped due to white/blacklist: %v", skippedDrivers) | ||
| } | ||
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| return nil | ||
| } | ||
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| // updateNodeFromFingerprint updates the node with the result of | ||
| // fingerprinting the node from the diff that was created | ||
| func (c *Client) updateNodeFromFingerprint(response *cstructs.FingerprintResponse) { | ||
| c.configLock.Lock() | ||
| defer c.configLock.Unlock() | ||
| for name, val := range response.GetAttributes() { | ||
| if val == "" { | ||
| delete(c.config.Node.Attributes, name) | ||
| } else { | ||
| c.config.Node.Attributes[name] = val | ||
| } | ||
| } | ||
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| // update node links and resources from the diff created from | ||
| // fingerprinting | ||
| for name, val := range response.GetLinks() { | ||
| if val == "" { | ||
| delete(c.config.Node.Links, name) | ||
| } else { | ||
| c.config.Node.Links[name] = val | ||
| } | ||
| } | ||
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| c.config.Node.Resources.Merge(response.GetResources()) | ||
| } | ||
|
There was a problem hiding this comment. You should change the node watcher from checking periodically to check via a channel trigger and send it when this function is called: https://github.com/hashicorp/nomad/blob/master/client/client.go#L1588 There was a problem hiding this comment. This will be in a follow up PR. |
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| // retryIntv calculates a retry interval value given the base | ||
| func (c *Client) retryIntv(base time.Duration) time.Duration { | ||
| if c.config.DevMode { | ||
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I don't believe you can get rid of the lock yet. This is a shared data structure that is being mutated/read concurrently. Apples to all places you are doing a fingerprint.