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terraform-client.js
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terraform-client.js
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const { execSync } = require('child_process');
class TerraformClient {
constructor(options) {
if (options && options.execSync) {
this.execSync = options.execSync;
} else {
this.execSync = execSync;
}
this.outputVariableCache = {};
// Sanity check for terraform:
try {
const stdout = this.execSync('terraform version').toString('utf8');
const validVersionRegex = /\bv\d+([.]\d+){2}\b/;
if (!stdout.match(validVersionRegex)) {
throw new Error(`Could not parse version of terraform from the following: ${stdout}`);
}
} catch (err) {
throw new Error(
`Problem retrieving version of terraform.\n` +
` Terraform must be installed to use serverless-terraform-variables.\n` +
` Internal error message follows: ${err.message}`,
err
);
}
// Sanity check for terraform state:
try {
this.execSync('terraform state list');
} catch (err) {
throw new Error(
`Could not retrieve terraform state.\n` +
` Make sure you have initialized terraform and acquired state via 'terraform init' with the correct terraform backend.\n` +
` Internal error message follows: ${err.message}`,
err
);
}
// Sanity check for terraform outputs:
try {
this.execSync('terraform output');
} catch (err) {
throw new Error(
`Could not retrieve terraform output from terraform state.\n` +
` Make sure you have initialized terraform and can acquired outputs from the terraform state via 'terraform output' command.\n` +
` Internal error message follows: ${err.message}`,
err
);
}
}
getOutputVariable(variableName) {
// Cache-lookup short-circuit:
if (this.outputVariableCache[variableName]) {
return this.outputVariableCache[variableName];
}
try {
// Fetch via external execution:
const outputVariableValue = this.execSync(`terraform output ${variableName}`)
.toString('utf8')
.trim();
// Cache for subsequent lookups:
this.outputVariableCache[variableName] = outputVariableValue;
// Return value found via terraform:``
return outputVariableValue;
} catch (err) {
throw new Error(
`Could not retrieve terraform output variable of name '${variableName}' from terraform state.\n` +
` Make sure you have defined an output of that name in terraform.\n` +
` Internal error message follows: ${err.message}`,
err
);
}
}
}
module.exports = TerraformClient;