/
required_hydrate_calls.go
74 lines (64 loc) · 2.22 KB
/
required_hydrate_calls.go
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package plugin
import (
"fmt"
"log"
)
// helper class to build list of required hydrate calls
type requiredHydrateCallBuilder struct {
fetchCallName string
requiredHydrateCalls map[string]*hydrateCall
queryData *QueryData
}
func newRequiredHydrateCallBuilder(d *QueryData, fetchCallName string) *requiredHydrateCallBuilder {
return &requiredHydrateCallBuilder{
queryData: d,
fetchCallName: fetchCallName,
requiredHydrateCalls: make(map[string]*hydrateCall),
}
}
func (c requiredHydrateCallBuilder) Add(hydrateFunc namedHydrateFunc, callId string) error {
hydrateName := hydrateFunc.Name
// if the resolved hydrate call is NOT the same as the fetch call, add to the map of hydrate functions to call
if hydrateName != c.fetchCallName {
if _, ok := c.requiredHydrateCalls[hydrateName]; ok {
return nil
}
// get the config for this hydrate function
config := getHydrateConfig(c, hydrateName)
if config == nil {
log.Printf("[WARN] failed to find hydrate config for %s", hydrateName)
return fmt.Errorf("failed to find hydrate config for %s", hydrateName)
}
call, err := newHydrateCall(config, c.queryData)
if err != nil {
log.Printf("[WARN] failed to add a hydrate call for %s: %s", hydrateName, err.Error())
return err
}
c.requiredHydrateCalls[hydrateName] = call
// now add dependencies (we have already checked for circular dependencies so recursion is fine
for _, dep := range config.Depends {
namedDep := newNamedHydrateFunc(dep)
if err := c.Add(namedDep, callId); err != nil {
log.Printf("[WARN] failed to add a hydrate call for %s, which is a dependency of %s: %s", namedDep.Name, hydrateName, err.Error())
return err
}
}
}
return nil
}
func getHydrateConfig(c requiredHydrateCallBuilder, hydrateName string) *HydrateConfig {
// first try plugin
config := c.queryData.plugin.hydrateConfigMap[hydrateName]
// fall back on table - we know there will at least be implicit config
if config == nil {
config = c.queryData.Table.hydrateConfigMap[hydrateName]
}
return config
}
func (c requiredHydrateCallBuilder) Get() []*hydrateCall {
var res []*hydrateCall
for _, call := range c.requiredHydrateCalls {
res = append(res, call)
}
return res
}