|
| 1 | +package cluster |
| 2 | + |
| 3 | +import ( |
| 4 | + "encoding/json" |
| 5 | + "strings" |
| 6 | + |
| 7 | + "github.com/samalba/dockerclient" |
| 8 | +) |
| 9 | + |
| 10 | +const namespace = "com.docker.swarm" |
| 11 | + |
| 12 | +// ContainerConfig is exported |
| 13 | +// TODO store affinities and constraints in their own fields |
| 14 | +type ContainerConfig struct { |
| 15 | + dockerclient.ContainerConfig |
| 16 | +} |
| 17 | + |
| 18 | +func parseEnv(e string) (bool, string, string) { |
| 19 | + parts := strings.SplitN(e, ":", 2) |
| 20 | + if len(parts) == 2 { |
| 21 | + return true, parts[0], parts[1] |
| 22 | + } |
| 23 | + return false, "", "" |
| 24 | +} |
| 25 | + |
| 26 | +// BuildContainerConfig creates a cluster.ContainerConfig from a dockerclient.ContainerConfig |
| 27 | +func BuildContainerConfig(c *dockerclient.ContainerConfig) *ContainerConfig { |
| 28 | + var ( |
| 29 | + affinities []string |
| 30 | + constraints []string |
| 31 | + env []string |
| 32 | + ) |
| 33 | + |
| 34 | + // only for tests |
| 35 | + if c.Labels == nil { |
| 36 | + c.Labels = make(map[string]string) |
| 37 | + } |
| 38 | + |
| 39 | + // parse affinities from labels (ex. docker run --label 'com.docker.swarm.affinities=["container==redis","image==nginx"]') |
| 40 | + if labels, ok := c.Labels[namespace+".affinities"]; ok { |
| 41 | + json.Unmarshal([]byte(labels), &affinities) |
| 42 | + } |
| 43 | + |
| 44 | + // parse contraints from labels (ex. docker run --label 'com.docker.swarm.constraints=["region==us-east","storage==ssd"]') |
| 45 | + if labels, ok := c.Labels[namespace+".constraints"]; ok { |
| 46 | + json.Unmarshal([]byte(labels), &constraints) |
| 47 | + } |
| 48 | + |
| 49 | + // parse affinities/contraints from env (ex. docker run -e affinity:container==redis -e affinity:image==nginx -e constraint:region==us-east -e constraint:storage==ssd) |
| 50 | + for _, e := range c.Env { |
| 51 | + if ok, key, value := parseEnv(e); ok && key == "affinity" { |
| 52 | + affinities = append(affinities, value) |
| 53 | + } else if ok && key == "constraint" { |
| 54 | + constraints = append(constraints, value) |
| 55 | + } else { |
| 56 | + env = append(env, e) |
| 57 | + } |
| 58 | + } |
| 59 | + |
| 60 | + // remove affinities/contraints from env |
| 61 | + c.Env = env |
| 62 | + |
| 63 | + // store affinities in labels |
| 64 | + if len(affinities) > 0 { |
| 65 | + if labels, err := json.Marshal(affinities); err == nil { |
| 66 | + c.Labels[namespace+".affinities"] = string(labels) |
| 67 | + } |
| 68 | + } |
| 69 | + |
| 70 | + // store contraints in labels |
| 71 | + if len(constraints) > 0 { |
| 72 | + if labels, err := json.Marshal(constraints); err == nil { |
| 73 | + c.Labels[namespace+".constraints"] = string(labels) |
| 74 | + } |
| 75 | + } |
| 76 | + |
| 77 | + return &ContainerConfig{*c} |
| 78 | +} |
| 79 | + |
| 80 | +func (c *ContainerConfig) extractExprs(key string) []string { |
| 81 | + var exprs []string |
| 82 | + |
| 83 | + if labels, ok := c.Labels[namespace+"."+key]; ok { |
| 84 | + json.Unmarshal([]byte(labels), &exprs) |
| 85 | + } |
| 86 | + |
| 87 | + return exprs |
| 88 | +} |
| 89 | + |
| 90 | +// Affinities returns all the affinities from the ContainerConfig |
| 91 | +func (c *ContainerConfig) Affinities() []string { |
| 92 | + return c.extractExprs("affinities") |
| 93 | +} |
| 94 | + |
| 95 | +// Constraints returns all the constraints from the ContainerConfig |
| 96 | +func (c *ContainerConfig) Constraints() []string { |
| 97 | + return c.extractExprs("constraints") |
| 98 | +} |
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